MT2834BR/MT2834BLR
Intelligent Data/Fax
Rack Mounted Modem
User Guide
Contents
Chapter 1 - Introduction ................................................................ 5
1.1 Introduction .............................................................................. 6
1.2 Features ................................................................................... 6
1.3 How to Use This Manual ......................................................... 7
Chapter 2 - Installation .................................................................. 8
2.1 Preliminaries ............................................................................ 9
2.1.1 Card Cage .................................................................... 9
2.1.2 Serial Cable ................................................................. 9
2.1.3 Telephone Line ............................................................ 9
2.2 Installation .............................................................................. 10
2.3 PC Board Controls ................................................................. 11
2.3.1 DIP-Switch Settings ................................................... 12
2.4 OOS (Busy Out) Toggle Switch ............................................ 14
2.4.1 Out of Service/Test Jumper ...................................... 15
2.4.2 MI/MIC Option Jumper .............................................. 15
2.5 Dial-Up and Leased Lines ..................................................... 16
2.6 Modem LED Indicators .......................................................... 17
Chapter 3 - Installation ................................................................ 19
3.1 Introduction ............................................................................ 20
3.2 Serial Port Limitations............................................................ 20
3.2.1 How Can You Identify Your UART Type? ................ 21
3.3 Configuring Your Software .................................................... 23
3.3.1 ConfiguringSoftware for Your Modem ...................... 23
3.4 PC Initialization Strings ......................................................... 24
3.4.1 Changing Default Parameters................................... 26
3.5 Macintosh Initialization .......................................................... 26
3.6 Configuring Software for Your Computer ............................. 27
3.6.1 Configuring Software for the Remote System.......... 28
3.6.2 Terminal Emulation .................................................. 28
3.6.3 File Transfer Protocols .............................................. 29
3.7 When to Disable Data Compression ..................................... 29
3.7.1 Disabling Error Correction ......................................... 30
Chapter 4 - ModemCommands................................................... 31
4.1 Modem AT Commands .......................................................... 32
4.1.1 Callback Security Commands ................................... 43
4.1.2 Remote Configuration ............................................... 45
4.1.3 Remote Configuration Procedures ........................... 45
4.1.4 V.25bis Commands ................................................... 46
4.2 S-Registers............................................................................. 48
4.3 Result Codes.......................................................................... 52
4.3.1 AT Commands and S-Register Summary ................ 55
Chapter 5 - Modem Testing ........................................................ 56
5.1 Local Analog Loopback Test/V.54 Loop 3 ............................ 57
5.2 Digital Loopback Test/V.54 Loop 2
(Local/Manual) ....................................................................... 58
5.3 Digital Loopback Test/V.54 Loop 2
(Remote/Automatic) ............................................................... 60
5.4 Local Analog Loopback Test
(Synchronous Mode).............................................................. 61
5.5 Digital Loopback Test (Local/Manual)
(Synchronous Mode).............................................................. 62
5.6 Digital Loopback Test (Remote/Automatic)...............................
(Synchronous Mode).............................................................. 63
Chapter 6 - Warranty and Service.............................................. 64
6.1 Introduction ............................................................................ 65
6.2 Limited Warranty .................................................................... 65
6.3 Tech Support.......................................................................... 66
6.3.1 Recording Modem Information.................................. 66
6.3.2 Service ....................................................................... 66
6.4 Upgrading the MT2834BR ..................................................... 67
6.4.1 Using FlashPro to Upgrade Modem Firmware ......... 67
6.5 Safety Warnings..................................................................... 68
6.6 Internet ................................................................................... 69
Chapter 7 - BABT Requirements................................................ 70
7.1 Compliance with BABT Requirements .................................. 71
7.1.1 European Low Voltage Directive .............................. 72
7.1.2 Compliance with BS6305 Clause 6.2, BS6320
Clause 7.2, and BABT/SITS/82/005S/D ................... 72
7.1.3 Compliance with BS6789: Section 3.1 and Part 2 ... 73
7.1.4 Compliance with BS6328 Part 1 ............................... 74
Appendices ................................................................................... 75
Appendix A ..................................................................................... 76
FCC Regulations for Telephone Line Interconnection ........ 76
Canadian Limitations Notice ................................................. 78
Appendix B ..................................................................................... 79
Technical Specifications ........................................................ 79
Index .............................................................................................. 84
Chapter 1 - Introduction
Chapter 1 - Introduction
1.1
Introduction
Welcome to the world of data communications. You have acquired one of
the finest intelligent data/fax modems available today, either the model
MT2834BR or MT2834BLR (MT2834), from Multi-Tech Systems. Your
MT2834 modem provides data communication at 33,600-14,400 bps
(*Enhanced V.34/V.32bis), as well as other prevalent datacomm standards.
The MT2834 also includes adaptive protocol enhancing used in typical
Unix® batch file transfers and support for IBM's AS/400 (iSeries)TM and
System3xTM environment. The MT2834BLR provides support for dial back-
up with automatic leased line restoral. This User Guide will help you install,
configure, test and use your MT2834 data/fax modem.
*Note enhancements on V.34 code (33.6K/31.2K) is awaiting formal ITU
approval; the ITU study group 14 has agreed on the technical side of the
proposal, with formal approval expected at the next ITU meeting in
Geneva.
1.2
Features
The MT2834 automatically adjusts to line conditions and the capabilities of
the modem it connects to, resulting in the highest possible speed, the most
accurate error correction, and the most efficient data compression possible
for each connection. The MT2834 is designed for data rates as high as
33,600 bps in full-duplex mode over public telephone lines.
MT2834 features include:
· Support of data rates of 33,600, 31,200, 28,800, 26,400, 24,000, 21,600,
19,200, 16,800, 14,400, 12,000, 9600, 7200, 4800, 2400, 1200, 0-300
bps.
· Automatic fallback to slower speeds in noisy line conditions, and fall-
forward to faster speeds as conditions improve.
· ITU-T V.42 LAP-M and MNP Classes 3 and 4 error correction.
· Data transfer rates up to 115,200 bps with V.42bis 4-to-1 data
compression.
6
· Automatic disabling of compression when transferring already-
compressed files.
· Serial port data rates adjustable to 115.2K bps.
· Autodial, redial, pulse (rotary) and touch-tone dial.
· Dial tone and busy signal detection for reliable call-progress detection.
· Compatibility with the standard AT command set used by most
communication programs.
· On-screen help menus.
· Nonvolatile memory for storage of customized modem parameters and
ten telephone numbers.
· Sends and receives faxes from your computer at 14,400, 9600, 7200 or
4800 bps.
· Responds to EIA TR.29 Class 2 fax commands.
· Supports UNIX-to-UNIX® UUCP Spoofing.
· Supports IBM's AS/400 (iSeries)TM and System3x environment.
1.3
How to Use This Manual
This chapter begins with a short introduction, a profile on modem features,
followed by a guide (which you are now reading) to the use of this manual.
This manual includes hardware installation and configuration described in
Chapter 2. Chapter 3 covers communication software configuration
recommended for the MT2834. Other issues covered include setting up
initialization strings, changing default parameters, configuring software for
the remote system and file transfer protocols. Chapter 4 covers modem AT
commands, Remote Configuration commands, S-Registers and Result
Codes. Chapter 5 illustrates the MT2834 diagnostic capabilities, providing
Analog and Digital Loopback testing procedures. Chapter 6 explains
product warranty and technical support. Appendices A and B respectively
describes FCC requirements and regulations and technical specifications.
Chapter 2 - Installation
Chapter 2 - Installation
2.1
Preliminaries
This chapter covers MT2834 installation and connection. In addition to the
contents of the MT2834 package, you will need the equipment listed
below.
2.1.1 Card Cage
The MT2834 is designed to mount in the Multi-Tech Systems' modem rack
(see Section 2.2 for various models available). This rack is an EIA-
standard 19-inch wide by 7-inch high rack, and mounts in any standard
computer cabinet. The rack has a sixteen modem slot capacity, one power
supply source (the CC1600 series card cage has a redundant power
supply capability), sixteen 25-pin (female) connectors for RS232C/V.24
interface and sixteen DB9 (female) connectors for phone line (the CC1600
series card cage has RJ11 back-plane connectors for phone line interface).
2.1.2 Serial Cable
You must provide a serial cable to connect each corresponding MT2834 to
your computer. The cable must have a DB-25 male interface into the
modem rack.
2.1.3 Telephone Line
The MT2834 uses one RJ11 jack per corresponding modem slot to
connect to the telephone lines. To connect the modem to the phone lines,
plug one end of the RJ11 cable that is provided with the modem into the
DB9 (9-pin connector) located on the back plane of the modem rack and
the other end into the phone-company-provided RJ11 or RJ11W modular
phone jack (CC916, CC1416 or CC2816 racks). To connect the modem to
the phone lines using the CC1600 modem rack, plug one end of the RJ11
cable provided with the modem into the rack's RJ11 connector (located on
the back plane of the modem rack) and the other end into the phone-
company-provided RJ11 or RJ11W modular phone jack.
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Chapter 2 - Installation
2.2
Installation
Perform the following procedure to install modem cards in the CC916,
CC1416, CC2816 or CC1600 racks*. The installation process involves:
1. Power cord must be unplugged prior to installation of the Power
Source(s). Insert Power Source(s) (PS216A or PS1600) into far right of
the rack cage.
2. Slide a modem card into one of sixteen available modem slots. Start by
inserting a modem into the left-most channel (slot #1) of the rack. The
toggle switch should be at the bottom of the card, with the component
side of the card facing the right. The modem’s gold edge connector is
offset so that the modem cannot be inserted incorrectly. Continue
installing modem cards as necessary.
3. Plug RS232C Cable into appropriate modem slot (DB25/25-pin
connector-female) at rear of rack. Note: Any cables connected to the
computer must be shielded to reduce interference.
4. If you are connecting your phone line directly to the modem card, plug
the phone line cable into the appropriate modem slot (DB9/9-pin
connector-female) at the rear of the rack and the other end into the
phone-company-provided RJ11 or RJ11W modular phone jack. To
connect the modem to the phone lines using an CC1600 modem rack,
plug one end of the RJ11 cable provided with the modem into the rack's
RJ11 connector (located on the back plane of the modem rack) and the
other end into the phone-company-provided RJ11 or RJ11W modular
phone jack.
5. Plug in modem rack power cord.
6. Verify remote modem's current configuration settings with your
MT2834BR in terms of data compression, error correction, transmission
rate, etc. (ATL5/ATL7 Command - see Chapter 4 on AT commands).
7. Attach MT2834BR to dial-up phone lines and/or leased lines and verify
DIP-Switch #10 and #5 settings (Section 2.5).
8. Make sure modem and computer/terminal serial port baud rates are
adjusted (Section 2.5.).
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Chapter 2 - Installation
9. Set both local and remote modems to either Normal (&E0&W0) mode
or to Reliable (&E2&W0) mode.
10. Verify leased line transmit level (DIP-Switch #3) setting (Section 2.3.1).
11.Proceed to Chapter 3 of this manual, or to your data communications
software manual.
* All Multi-Tech rack-mounted modem cards (except MT1432/2834) are
interchangeable among all types of modem racks. There is, however, slight
LED differences. Model #CC216G is a “generic” modem rack for any rack
mount modem card. The user affixes LED labels on a per slot basis depending
on modem type.
2.3
PC Board Controls
The MT2834 is designed on a single printed circuit board. This board
contains sixteen DIP-Switches. There is a two-position"Out of Service"
(OOS) toggle switch that extends from the front of the modem circuit card.
There is also a two-position MI/MIC berg jumper and TEST/OOS berg
jumper.
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Chapter 2 - Installation
The sixteen DIP-Switches and two berg jumpers control various modem
options or set default values for the MT2834 Command mode. There is a
difference in how several of the switches operate depending on whether
you are in synchronous or asynchronous mode (DIP-Switch #12).
Most communications software packages have installation procedures of
their own, which call for certain modem DIP-Switch settings. If you are
using a package other than MultiExpress, follow the software's instructions.
2.3.1 DIP-Switch Settings
The vast majority of installations are similar, with the MT2834 being used
to dial up a remote installation where the call is automatically answered.
The factory default DIP-Switch settings are based on this assumption. The
following is a brief description and summary of the MT2834's DIP-Switch
options:
Switch Function
Position Effect
#1
#2
#2
#3
#3
#4
#4
#5
DTR Forced/
DTR from Interface *
UP*
DOWN
DTR forced from
computer/terminal
Flow Control &E4*
(Async/Dial-Up/Leased Line) DOWN
UP*
Hardware flow
control enabled
SDLC*/BSC (Sync)
UP*
DOWN
SDLC enabled
Result Codes Enabled*
(Async Dial-up)
UP
DOWN*
Modem responses
are echoed
DbM Transmit -15dB/-11dB* UP
(Async/Sync/Leased Line)
Lease Line
transmits at -11dB
DOWN*
UUCP Disabled* (Async
Dial-Up/Leased Line)
UP*
DOWN
UUCP
"spoofing" Disabled
AS/400 Mode Disabled*
(Sync Dial-Up/Leased Line)
UP*
DOWN
AS/400 Mode
Disabled
Auto-Answer Enabled*
Async/Sync/Dial-Up)
UP*
DOWN
Auto-Answer
in dial-up mode
* Factory default setting.
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Chapter 2 - Installation
Switch Function
Position Effect
#5
Answer/Originate*
UP*
Originate call in
(Async/Sync/Leased Line)
DOWN
Lease Line mode
#6
Max-Throughput Enabled*
(Async/Dial-Up/Leased)
UP*
DOWN
Modem set-up to
operate at highest
efficiency level
#6
Slave Clock Disabled*
(Sync/Dial-Up/Leased)
UP*
DOWN
Clock controlled
by remote device
#7
RTS/Normal/Forced*
UP
RTS Forced On
(Sync/Async/Dial/Leased)
DOWN*
#8
Command Mode Enabled*
(Sync/AsyncDial/Leased)
UP
Command Mode
DOWN* Enabled
UP Remote
DOWN* LoopBack Enabled
#9
Local/Remote LoopBack*
(Async/Sync/Dial/Leased)
#10
#11
#11
#12
Dial-Up*/Leased-Line
UP*
DOWN
Dial-Up Enabled
"AT"/Multi-Tech Result Codes UP
(Asynchronous)
Multi-Tech Result
DOWN* Codes Enabled
UP Selects Transmit
DOWN* Clock Source
Internal*/External Clocking
(Synchronous)
Sync/Async Mode*
UP
Async Enabled
DOWN*
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Chapter 2 - Installation
Dip Switch Settings #13 - 16
Note: A modem baud rate command (e.g., $MB33600) overrides the
setting of the speed selection switches (#13 and #14).
Switch Position
Effect
13/14 UP/UP*
28.8 K bps Operation (Default)
13/14 DOWN/UP
13/14 UP/DOWN
13/14 DOWN/DOWN
19.2 K bps Operation
14.4 K bps Operation
9600 bps Operation
#15
#15
UP*
DOWN
CD/DSR from Interface
CD/DSR Forced On
#16
#16
UP
DOWN
Used in combination with
DIP-Switch #9/Loopback Tests
* Factory default setting
2.4
OOS (Busy Out) Toggle Switch
The MT2834 contains a two-position OOS switch on the front panel. This
switch can be used to create a “busy out” (OOS) condition for the modem
(i.e., take the modem off-hook). To place a modem in the Busy condition,
move the OOS toggle switch to the (BUSY) position. The modem then
goes off-hook, its OOS and OH LEDs light, and incoming calls to this
modem get a busy signal. If you suspect a problem with a particular
modem, you can use the BUSY switch to have an optional device (such as
a “hunt group”) that looks for a non-busy line to perform a “roll over” to the
next available modem while you check the status of the Busy modem.
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Chapter 2 - Installation
2.4.1 Out of Service/Test Jumper
When the MT2834 is Out Of Service (OOS), it is busy to incoming calls. In
the Test (default) setting, the modem drives pin 25 high when the modem
is in Test mode. In the OOS (optional) setting, the computer or terminal
forces pin 25 high and puts the modem in a busy condition. Note that
jumper (shorting) plugs are not shipped with the MT2834, but is provided
by Multi-Tech’s Tech Support group on request.
Test Setting
(Factory Default)
OOS Setting
(Optional)
2.4.2 MI/MIC Option Jumper
To activate MI/MIC option (Mode Indicate/Mode Indicate Common
Interface), you must first move MI/MIC jumper plugs. The $MI command,
then controls this function (AT$MI1 enables MI/MIC and AT$MI0 disables
MI/MIC). This option is for applications where the modem's dialing
capability is not used, and dialing is done by an external device (such as a
801 dialer, a computer, or a PBX/CBX system dialer).
MI/MIC
MI/MIC
MI/MIC Disabled
(Factory Default)
MI/MIC Enabled
(Optional)
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Chapter 2 - Installation
2.5
Dial-Up and Leased Lines
Connection to the phone system is made via RJ11 type jacks such as an
RJ11C or RJ11W. It can also be connected to an RJ41 or an RJ45S jack,
but would not use these jack's dB-level programming features. The
MT2834 is designed to transmit at a permissive level of -11dB.
To connect the modem to the phone lines, plug one end of the RJ11 cable
that is provided with the modem into the corresponding DB9 or RJ11
connector (dependent upon card cage used) located on the back plane of
the modem rack and the other end into the phone-company-provided RJ11
or RJ11W modular phone jack. Make sure that DIP-Switch #10 is in the UP
position (default) when in dial-up mode.
Although the majority of installations involves dial-up lines, the MT2834
also connects to two-wire leased lines (sometimes referred to as
dedicated, private, or 3002 lines).
To connect the modem to leased lines, first determine the type of line
termination provided by the phone company. Most phone companies
provide a terminal block with a pair of screws. Some provide a
conventional RJ11 type of connector. If the RJ11 connector is used, you
can use the same cable that you use for dial-up connection. If the screw
terminal type connector is used, you may need to order the #CA167 cable
from Multi-Tech Systems.
Make two DIP-Switch setting changes on the modem's PC board. The first
involves placing DIP-Switch #10 in the DOWN position (changes the
modem from dial-up to leased line operation). The second DIP-Switch
change requires that one of the two modems on the leased line circuit is
set to "originate", and the other is set to "answer". To do this, change the
setting of DIP-Switch #5. When you changed the DIP-Switch #10 setting,
you also changed the function of DIP-Switch #5. Now the UP position
selects answer mode frequencies while the DOWN position selects
originate mode frequencies. Place DIP-Switch #5 in the UP position on
one of the two modems, and on the other modem, place Switch #5 DOWN.
It doesn't matter which is which, just so you have local and remote
modems in opposite modes.
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Chapter 2 - Installation
2.6
Modem LED Indicators
The MT2834 has ten LED diagnostic indicators.
RCV XMT CO 28.8 14.4
24
OH
DTR
RI ERR
1. Receive Data (RCV). This LED blinks when data is being received, on
for a space, off for a mark. The state of this RCV LED matches that of
the RCV circuit on Pin 3 of the RS232C/V.24 interface.
2. Transmit Data (XMT). This LED blinks when data is being transmitted,
on for a space, off for a mark. The state of this LED matches that of the
XMT circuit on Pin 2 of the RS232C/V.24 interface.
3. Carrier ON (CO). This LED lights when a valid carrier tone has been
detected.
4. 28,800 bps (28.8). This LED is lit when the modem is connected at
28,800 bps.
5. 14,400 bps (14.4). This LED is lit when the modem is connected at
14,400 bps. Note that when both 28.8 and 14.4 LEDs light, modem is in
21,600-26,400 bps mode of operation.
6. 2400 bps (24). This LED is lit when the modem is connected at 2400
bps.
7. Off Hook (OH). This LED is lit when the phone line is “off hook”. This
occurs when the modem is dialing, on line, or answering a call. The
LED also flashes when the modem is pulse dialing in the Command
Mode.
8. Data Terminal Ready (DTR). When the DTR LED is lit, the modem is
permitted to answer an incoming call. When DTR goes off, a connected
modem disconnects if dependent on DTR. The state of this DTR LED
matches that of the DTR circuit on Pin 20 of the RS232C/V.24 interface.
9. Ring Indicator (RI). This LED is lit during the ringing interval as an
incoming call is received.
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Chapter 2 - Installation
10. Error (ERR). When the ERR LED is flashing, the leased line is down
and the modem is in self-test mode has failed. When ERR LED is on,
this indicates the modem is in an out of service (OOS) state. When the
modem is out of service, it is busy to incoming calls.
NOTE: To verify Enhanced V.34 mode is engaged:
1. Type +++AT<CR> .
2. Type ATL8 .
3. The modem's current on-line condition is displayed. An
example of L8 listing is shown below.
Figure 2-2. On-Line Diagnostics
18
Chapter 3 - Installation
Chapter 3 - Configuration
3.1
Introduction
Since your communications software configuration is affected by the
capabilities of your computer, this chapter begins with a discussion of the
limitations of some serial ports and how to identify them. It then discusses
communications configuration in general and recommends settings
specifically for the MT2834.
3.2
Serial Port Limitations
When you configure your software, you need to consider how the hardware
on both ends of the connection will affect the connection. Some serial
ports, particularly those in older PC-compatible computers, may limit the
performance of the MT2834. You should know if yours is one of them.
The limiting factor is an integrated circuit called a Universal Asynchronous
Receiver/Transmitter, or UART. All data from your modem flows through it.
The UARTs typically used in PC-compatible computers are types 8250,
8250A, 16450, and 16550AFN. The 8250 is unreliable above 9,600 bps,
and the 8250A and 16450 are unreliable above 19,200 bps. If the modem
sends data to the UARTs above those speeds, the UARTs may not be able
to process the data fast enough to keep from losing some of it. The
16550AFN, however, can safely handle data to 115,200 bps.
When a modem communicates with V.42bis 4-to-1 compression enabled, it
sends up to four times as much uncompressed data to the serial port as it
receives compressed over the telephone line. Therefore, a modem
communicating at 14,400 bps may require a serial port that can reliably
transfer data at four times 14,400 bps, or 57,600 bps; at 19,200 bps it may
require one that works reliably up to four times 19,200 bps, or 76,800 bps;
and at 28,800 and 33,600 bps it may require one that works reliably up to
a maximum of 115,200 bps. If your serial port cannot handle these speeds,
we recommend that you replace your present serial card with one that has
a 16550AFN UART or equivalent.
Macintosh computers do not use UARTs. The Macintosh SE through IIfx
models use a Zilog Z8530 chip called a Serial Communications Controller,
or SCC, that has a maximum speed of 57,600 bps. This speed can be
20
Chapter 3 - Configuration
compromised by other serial communications, including printer
transmissions and Appletalk, the networking software that allows
Macintoshes to share files. When Appletalk is active it controls all serial
communications on the Macintosh. Because it gives priority to network
communications, it may lose modem data at higher transmission speeds.
Therefore, when Appletalk is active you risk losing data on serial port
communications over 2400 bps, though most users can work up to 9600
bps without problems. Other activities that could cause the serial driver to
drop bits at high speeds include the floppy disk driver formatting a disk, the
CPU paging in or out in virtual memory mode, and the Mac IIci or IIsi
running the on-board video in 8-bit mode. Therefore, for maximum
communications speed on the Macintosh, we recommend as few
concurrent activities as possible. To use V.42bis compression at 19,200
bps or faster, we recommend that you install a high speed serial port card.
Newer Macintosh computers, such as the Quadra and Centris models,
support serial port speeds up to 115,200 bps.
3.2.1 How Can You Identify Your UART Type?
If you have MS-DOS 6.0 or later, you can find your UART type from a
diagnostic program called MSD. To use it, type MSD at the DOS prompt.
After the opening screen, select COM Ports. The last line of the report tells
you what type UART you have for each COM port. MSD does not
distinguish between the 8250 and the 8250A. However, if you have an IBM
AT or newer computer, you likely have an 8250A or 16450 UART installed,
both of which are reliable to 19,200 bps. If you would like more detailed
information about your UART than MSD can provide, you can download
shareware UART identification programs from the IBM Communications
Forum.
21
Chapter 3 - Configuration
Figure 3-1. MSD UART Identification, Screen 1
Figure 3-2. MSD UART Identification, Screen 2
22
Chapter 3 - Configuration
3.3
Configuring Your Software
Communications software must be configured to work with your modem,
your computer, and the remote system it is calling. Fortunately, most
communications programs make the process easy by providing a default
initialization string for your modem as well as defaults for most of the other
required parameters.
3.3.1 Configuring Software for Your Modem
Because remote computers may have different connection requirements
such as speed, number of bits, parity, log-on sequences, etc.,
communications software is typically configured by sessions, each session
having a unique configuration for a given connection (e.g., to a BBS or
commercial online service). Most communications programs, however,
have a separate modem configuration menu because modem
configurations rarely change from session to session.
The most important configuration is the modem initialization string. This is
a sequence of commands the software uses to configure the modem when
the communications software is loaded or when a session begins. Always
begin the initialization string with the ATtention command AT, then follow it
with the modem reset command, &F. Issuing a reset command before
other commands ensures that you are starting with a known state.
The rest of the commands in the initialization string depend on the
capabilities of the modem and what you want it to do. Some older
communications programs require you to create the initialization string by
yourself. Most modern communications programs, however, provide you
with a ready-made initialization string that is automatically selected when
you choose your modem model from a list. It is a poor idea to use an
initialization string intended for another modem, especially one from
another manufacturer, because modem capabilities and command
implementations vary from modem to modem. However, if your MT2834BR
does not appear on a modem list, you may use the MultiModemII
initialization string.
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Chapter 3 - Configuration
3.4
PC Initialization Strings
We recommend the following initialization string for a MT2834 connected
to a PC-compatible computer:
AT &F X4 S0=0 ^M
This string resets the MT2834 to the factory default settings, selects
extended result codes with NO DIAL TONE and BUSY, and turns off auto-
answer. ^M must end every string sent to the modem from software. It is
the ASCII code for the RETURN key on most keyboards, and the default
code for the carriage return character in the MT2834 and most
communications programs. The carriage return character is defined in the
MT2834 in S-register S3; if you change it, you must also change the
carriage return character code used in your communications software. If
you send a command directly to the modem in terminal mode rather than
indirectly through communications software, you must end the command
string by pressing the RETURN key (<CR>) instead of adding ^M to the
string.
24
Chapter 3 - Configuration
Figure 3-2. The MEW Modem Initialization Setup
* Note that the above and following set up screens are examples found in
MultiExpress for Windows (MEW), and that other 3rd party data communication
software is similar but different.
25
Chapter 3 - Configuration
3.4.1 Changing Default Parameters
The default values for the other parameters in modem configuration menus
rarely need changing. They typically include the dialing prefix (ATDT for
touch-tone service and ATDP for rotary service), the dialing suffix (^M), the
hang-up string (+++ATH0^M), and response messages (RING, NO
CARRIER, BUSY, etc.). Communications software with a host mode might
also include an auto-answer string (AT S0=1^M).
3.5
Macintosh Initialization
Macintosh computers cannot use RTS/CTS hardware flow control without a
serial cable wired for hardware control. The Macintosh 128 and 512
models cannot use RTS/CTS flow control at all. For those Macintoshes
turn off the default RTS/CTS hardware flow control, turn on XON/XOFF
flow control and pacing, and ignore DTR:
AT &F X4 &E5 &E13 &D0 ^M
For hardware flow control, use the following initialization string:
AT &F X4 &E13 &D0 ^M
Add S0=0 to both strings to disable auto-answer if the MT2834BR is on a
voice line.
You can store the initialization string in nonvolatile memory. With your
communications software open and connected to the modem’s COM port,
type the initialization string in the terminal window, substituting a carriage
return for ^M. To store the string, enter
AT &F9 &W0 <CR>.
Now you can initialize your modem with the following simple string:
AT Z ^M
26
Chapter 3 - Configuration
Configuring Software for Your Computer
3.6
Configure the communications software to match the computer’s
configuration. If the MT2834 is connected to the COM2 serial port, select
"COM2" under the Device drop-down menu.
Select the appropriate serial port baud rate. This is the speed the modem
communicates with the computer, not the speed the modem communicates
with another modem.
If V.42bis data compression is enabled, select a serial port baud rate four
times the transmission speed of the modem to optimize data compression.
If the UART is fast enough, set the serial port baud rate to a minimum of
four times the top speed of the modem.
Figure 3-3. MEW Configuration Parameters Screen
For an 8250 UART, the most reliable serial port speed is 9600 bps. For an
8250A or a 16450 UART, try 19,200 bps. For a 16550 UART or equivalent,
select a serial port setting of 115,200.
27
Chapter 3 - Configuration
3.6.1 Configuring Software for the Remote System
You must meet the requirements of the remote system for successful
communications. Though the MT2834 can automatically synchronize with
the speed of the other modem, you must specify parameters such as type
of flow control, break length, number of data bits, number of stop bits, and
parity. If you set these parameters incorrectly with the remote system,
gibberish will appear on your screen.
3.6.2 Terminal Emulation
If you are accessing the remote computer as if from an on-site terminal, the
keyboard codes used by your computer may not match the ones used by
the remote computer. To be compatible with the remote computer, your
software must be able to substitute the appropriate codes in what is known
as terminal emulation. Most communications programs can emulate the
most common mainframe terminals, including the DEC VT100, VT 102,
and VT52 terminals, and the basic TTY mode. The following is the
MultiExpress for Windows Terminal Emulation screen.
Figure 3-4. MEW Terminal Emulation Setup Screen
28
Chapter 3 - Configuration
3.6.3 File Transfer Protocols
When you upload or download files with your modem, the host computer
will ask which file transfer protocol you want to use. Most communications
programs allow you to choose a default protocol. Your software’s
documentation should list the ones it can use (not all communications
programs support all protocols). Zmodem is the default protocol in
MultiExpress for Windows, and we recommend it for most transfers. The
following is the MEW File Transfer Protocols screen.
Figure 3-5. MEW File Transfer Protocols Screen
3.7
When to Disable Data Compression
If your serial port cannot keep up because it has an older UART, you may
lose data when using data compression. Also, the speed advantage
hardware compression gives you is entirely dependent on how much the
data being transmitted can be compressed. If the data is already in
compressed form—a .ZIP or a .SIT file, for example—trying to compress it
more will actually slow the transmission slightly compared to transmitting
the same file with compression disabled. This effect will be most noticeable
if your modem negotiates MNP 5 compression with the other modem.
V.42bis will not try to further compress a compressed file, but MNP 5 will.
29
Chapter 3 - Configuration
The command to disable compression is AT &E14 <CR>. If you have an
older UART or if you use your modem mostly for downloading long,
compressed files from BBSs, you may want to include the &E14 command
in your initialization string as follows:
AT &F S0=0 X4 &E14 ^M
As a general rule, you should try to transmit files in already-compressed
form rather than relying on V.42bis hardware compression. Because
software compression is more efficient than hardware compression, you
will have a higher throughput with the former. Of course, this efficiency
does not include the time spent compressing and decompressing .ZIP or
.SIT files, but it will save on phone bills. And hardware compression will
still be there for those occasions when it is inconvenient to compress a file
with software. Note also that when you download files with compression
disabled, you can use a slower serial port if you have an older UART.
3.7.1 Disabling Error Correction
By default, the MT2834 is set to auto-reliable mode. In this mode the
MT2834 determines during the handshake whether the other modem is
using V.42 error correction. If it is, the MT2834 then switches itself to
reliable mode and enables error correction. If it is not, the MT2834 remains
in non-error correction mode.
Normally, we recommend that you leave the MT2834 set to auto-reliable
mode (&E1). However, you may encounter some circumstances in which
the MT2834 will work better with error correction turned off. For example, it
has been reported that on CompuServe error correction will slow file
transfers at modem speeds of 9600 bps and under. If this is a problem for
you, you can turn off error correction with the command AT &E0, or you
can include the command in your initialization string as follows:
AT &F S0=0 X4 &E0 ^M
30
Chapter 4 - Modem
Commands
Chapter 4 - Commands
4.1
Modem AT Commands
AT commands are the means by which you, and your communications
software, are able to communicate with and configure your modem. They
enable you to establish, read, and modify parameters in addition to dialing.
The following provides a summary and brief explanation of the AT
commands recognized by the MT2834.
COMMAND:
VALUES:
AT
n/a
DEFAULT:
n/a
DESCRIPTION:
Attention Code that precedes most command strings
except A/, A: and Escape Codes.
COMMAND:
VALUES:
Return
n/a
DEFAULT:
n/a
DESCRIPTION:
Pressing the RETURN key executes most commands.
COMMAND:
VALUES:
A
n/a
DEFAULT:
n/a
DESCRIPTION:
Answer call, even if no ring present.
COMMAND:
VALUES:
$
n/a
DEFAULT:
n/a
DESCRIPTION:
This symbol placed in dialing string enables the modem to
detect AT&T's "call card" tones to access user's calling
card to originate an on-line connection.
COMMAND:
VALUES:
A/
n/a
DEFAULT:
n/a
DESCRIPTION:
Repeat last command. (Do not precede this command with
AT. Do not hit RETURN to execute).
COMMAND:
VALUES:
A:
n/a
DEFAULT:
n/a
DESCRIPTION:
Continuous redial (10 redials in DOC units) of last number
until answered. (Not used on International Models).
32
Chapter 4 - Commands
COMMAND:
VALUES:
DEFAULT:
$An
n = 0 or 1
$A0
DESCRIPTION:
$A0 discards data during auto-reliable time period. $A1
buffers data during auto-reliable time period.
COMMAND:
VALUES:
#An
n = 0 thru 3
DEFAULT:
#A0
DESCRIPTION:
#A0 selects initial handshake at 33600 to 31200 to 28800
to 24000 to 21600 to 19200 to 16800 to 14400 to 12000 to
9600 to 4800 to 2400 to 1200 to 300 bps.
#A1 selects initial handshake at 33600 bps only.
#A2 selects initial handshake at 33600 to 31200 to 28800
to 24000 to 21600 to 19200 to 16800 to 14400 to 9600 to
4800 bps.
#A3 selects initial handshake at 2400 to 1200 to 300 bps.
COMMAND:
VALUES:
Bn
n = 0 or 1
DEFAULT:
B0
DESCRIPTION:
B0 selects V.21 for 300 bps operation.
B1 selects for 300 bps operation (not used on International
Models).
COMMAND:
VALUES:
&Bn
n = 0 or 1
DEFAULT:
&B0
DESCRIPTION:
&B0 selects normal transmit buffer size.
&B1 selects reduced transmit buffer size.
COMMAND:
VALUES:
&BSn
n = 0 or 1
DEFAULT:
&BS1
DESCRIPTION:
&BS0 selects maximum transmit block size of 64
characters.
&BS1 selects maximum transmit block size of 256
characters (MNP mode) or 128 characters (LAP-M mode).
COMMAND:
VALUES:
$BAn
n = 0 or 1
DEFAULT:
$BA0
DESCRIPTION:
$BA0 selects speed conversion on.
$BA1 selects speed conversion off.
COMMAND:
&Cn
33
Chapter 4 - Commands
VALUES:
DEFAULT:
n = 0, 1, 2 or 4
&C1
DESCRIPTION:
&C0 forces Carrier Detect on.
&C1 lets Carrier Detect act normally.
&C2 lets Carrier Detect drop S24 time on disconnect.
&C4 resets modem when Carrier Detect drops.
COMMAND:
VALUES:
&CDn
n = 0 or 1
DEFAULT:
&CD0
DESCRIPTION:
&CD0 execute cleardown on disconnect.
&CD1 do not execute cleardown on disconnect.
COMMAND:
VALUES:
Ds
s = phone #
DEFAULT:
n/a
DESCRIPTION:
Dial a telephone number “s”, where s may include up to 60
digits or T, P, R, comma and ; characters.
COMMAND:
VALUES:
DsNd
s = phone # and d = 0 thru 9
DEFAULT:
n/a
DESCRIPTION:
Store telephone number. To store, enter phone number "s",
followed by N, then Directory Number "d".
COMMAND:
VALUES:
&Dn
n = 0 thru 3
DEFAULT:
&D2
DESCRIPTION:
&D0 means DTR is ignored
&D1 means modem returns to command mode.
&D2 lets modem react to DTR normally.
&D3 resets the modem to default parameters.
COMMAND:
VALUES:
$Dn
n = 0 or 1
DEFAULT:
$D0
DESCRIPTION:
$D0 disables DTR Dialing.
$D1 enables DTR Dialing.
COMMAND:
VALUES:
%DF
n = 0 or 1
DEFAULT:
%DF0
DESCRIPTION:
%DF0 selects V.34 Line Probe Data in Graph Format.
%DF1 selects V.34 Line Probe Data in Table Format.
COMMAND:
%DP
34
Chapter 4 - Commands
VALUES:
DEFAULT:
n = 0 or 1
%DP0
DESCRIPTION:
%DP0 selects do not read Line Probe Information from
DSP during handshaking.
%DP1 selects read Line Probe Information from DSP
during handshaking.
COMMAND:
VALUES:
En
n = 0 or 1
DEFAULT:
E1
DESCRIPTION:
E0 selects do not echo Command mode characters.
E1 selects do echo Command mode characters.
COMMAND:
VALUES:
&En
n = 0 thru 15
DEFAULT:
DESCRIPTION:
&E1, &E4, &E6, &E10, &E13, &E15
&E0 selects no error correction.
&E1 selects V.42 Auto-reliable Mode.
&E2 selects V.42 Reliable Mode.
&E3 selects no modem-initiated flow control.
&E4 selects CTS modem-initiated flow control.
&E5 selects Xon/Xoff modem-initiated flow control.
&E6 selects Xon/Xoff not passed through.
&E7 selects Xon/Xoff passed through.
&E8 selects Enq/Ack pacing off.
&E9 selects Enq/Ack pacing on.
&E10 selects Normal Mode flow control off.
&E11 selects Normal Mode flow control on.
&E12 selects Pacing off.
&E13 selects Pacing on.
E14 selects data compression disabled.
&E15 selects data compression enabled.
COMMAND:
VALUES:
%En
n=0 thru 5
DEFAULT:
%E1
DESCRIPTION:
%E0 = Modem Won’t Escape.
%E1 = +++ Method (default setting).
%E2 = Break Method.
%E3 = Either +++ or Break Method.
%E4 = No "OK" Response to +++
%E5 = "OK" Response to +++
COMMAND:
#Fn
35
Chapter 4 - Commands
VALUES:
DEFAULT:
n = 0 thru 2
#F2
DESCRIPTION:
#F0 means no fallback when on-line.
#F1 means fallback from 33600 to 4800 bps when on-line
(increments of 2400 bps).
#F2 means fallback to 4800 bps from 33.6K bps/fall
forward if line improves (increments of 2400 bps).
COMMAND:
VALUES:
&Fn
n = 0, 8 or 9
DEFAULT:
&F8
DESCRIPTION:
&F loads factory default values from ROM.
&F8 reads factory default values when &F is issued.
&F9 reads parameters stored in nonvolatile memory when
&F is issued.
COMMAND:
VALUES:
$Fn
n = 0 or 1
DEFAULT:
$F1
DESCRIPTION:
$F0 means do not fall back to normal connect if CR
received.
$F1 means fall back to normal connect if CR received.
COMMAND:
VALUES:
$FCn
n = 0 or 1
DEFAULT:
$FC1
DESCRIPTION:
$FC0 means no transmit of 5 second 2100Hz signal.
$FC1 transmits 5 second 2100Hz signal.
COMMAND:
VALUES:
&Gn
n = 0, 1 or 2
DEFAULT:
&G0
DESCRIPTION:
&G0 turns off CCITT guard tones.
&G1 turns on CCITT 550 Hz guard tone.
&G2 turns on CCITT 1800 Hz guard tone (not used on
International models).
COMMAND:
VALUES:
Hn
n = 0 or 1
DEFAULT:
n/a
DESCRIPTION:
H0 selects Hang Up (go on hook).
H1 selects Go Off Hook.
COMMAND:
$Hn
36
Chapter 4 - Commands
VALUES:
n = 1 thru 3
DEFAULT:
Read Only Command
DESCRIPTION:
$H1 brings up Help Screen #1.
$H2 brings up Help Screen #2.
$H3 brings up Help Screen #3.
COMMAND:
VALUES:
In
n = 0,1or 2
DEFAULT:
DESCRIPTION
Read Only Command
I0 requests modem ID #.
I1 requests firmware revision #.
I2 for MTS internal use.
COMMAND:
VALUES:
I9
N/A
DEFAULT:
Read Only Command
DESCRIPTION:
The I9 command is a query to display this modem's
characteristics when operating within Windows 95. Entering
ATI9<cr> invokes BR 28800 FAX CT on your video
monitor.
(The response to the query reveals that your
modem is a BR, 28.8K, FAX and Class Two capable
device.)
COMMAND:
VALUES:
L
5, 6, 7, 8, 9, 10 and 11
DEFAULT:
Read Only Command
DESCRIPTION:
Lists all stored telephone numbers in memory.
L5 lists all current operating parameters.
L6 lists all current S-Register values.
L7 lists additional parameters.
L8 lists current on-line diagnostics.
L9 displays Signal Strength Information.
L10 displays Signal to Noise Ratio Information.
L11 displays Noise Information.
COMMAND:
VALUES:
#Ln
n = 0 thru 3
DEFAULT:
#L0
DESCRIPTION:
#L0 selects modems negotiate V.42 Mode.
#L1 selects MNP on and LAP-M off.
#L2 selects LAP-M on and MNP off.
#L3 selects no detection phase; go directly to LAP-M
mode.
COMMAND:
$MBn
37
Chapter 4 - Commands
VALUES:
n = speed
DEFAULT:
$MB33600 bps
DESCRIPTION:
$MB75 selects CCITT V.23 mode.
$MB300 selects 300 bps on-line.
$MB1200 selects 1200 bps on-line.
$MB2400 selects 2400 bps on-line.
$MB4800 selects 4800 bps on-line.
$MB9600 selects 9600 bps on-line.
$MB14400 selects 14400 bps on-line.
$MB19200 selects 19200 bps on-line.
$MB28800 selects 28800 bps on-line.
$MB33600 selects 33600 bps on-line.
COMMAND:
VALUES:
Nd
d = 0 thru 9
DEFAULT:
n/a
DESCRIPTION:
Dial stored telephone number "d" (do not include the letter
D in this command).
COMMAND:
VALUES:
DEFAULT:
NdNe
d = 0 thru 9; e = any other number 0 thru 9
n/a
DESCRIPTION:
Number Linking. If first number dialed is busy, another
stored number may be automatically dialed. For example, if
stored number "d" is dialed, and is busy, stored number "e"
is then dialed.
COMMAND:
VALUES:
O
n/a
DEFAULT:
n/a
DESCRIPTION:
Exit Command Mode and go into On-Line Mode.
COMMAND:
VALUES:
P
n/a
DEFAULT:
Tone Dial
DESCRIPTION:
Modem will pulse-dial numbers following the P.
COMMAND:
VALUES:
&Pn
n = 0 or 1
DEFAULT:
&P0
DESCRIPTION:
&P0 selects 60-40 pulse ratio.
&P1 selects 67-33 pulse ratio.
COMMAND:
Qn
38
Chapter 4 - Commands
VALUES:
DEFAULT:
n = 0, 1 or 2
Q0
DESCRIPTION:
Q0 selects Result Codes displayed.
Q1 selects Result Codes suppressed (quiet).
Q2 selects Dumb Answer Mode.
COMMAND:
VALUES:
&Qn
n = 0 or 1
DEFAULT:
&Q0
DESCRIPTION:
&Q0 selects Multi-Tech command set.
&Q1 selects AT command set.
COMMAND:
VALUES:
Rn
n = 0 or 1
DEFAULT:
R0
DESCRIPTION:
R0 means modem will not reverse modes.
R1 means modem will reverse modes.
COMMAND:
VALUES:
&Rn
n = 0, 1 or 2
DEFAULT:
&R1
DESCRIPTION:
&R0 lets Clear to Send act normally.
&R1 forces Clear to Send on.
&R2 drops for 1 second on disconnect.
COMMAND:
VALUES:
$Rn
n = 0 or 1
DEFAULT:
$R0
DESCRIPTION:
$R0 selects disconnect after 12 retransmits.
$R1 selects do not disconnect after 12 retransmits.
COMMAND:
VALUES:
&RFn
n = 0 or 1
DEFAULT:
&RF1
DESCRIPTION:
&RF0 selects CTS follows RTS.
&RF1 selects CTS to act independently
COMMAND:
VALUES:
DEFAULT:
Sr=n
r = 0-11, 13, 15-17, 24-26, 29, 30, 32, 34, 36, 37, 48
n/a
DESCRIPTION:
Sets value of S-Register “r” to value of “n”, where “n” is
entered in decimal format.
COMMAND:
Sr?
39
Chapter 4 - Commands
VALUES:
r = 0-11, 13, 15-17, 24-26, 29, 30, 32, 34, 36, 37, 48
DEFAULT:
n/a
DESCRIPTION:
Reads value of S-Register “r” and displays value in 3-
digit decimal format.
COMMAND:
VALUES:
$SBn
n = speed
DEFAULT:
$SB115200 bps
DESCRIPTION:
$SB300 selects 300 bps at serial port.
$SB1200 selects 1200 bps at serial port.
$SB2400 selects 2400 bps at serial port.
$SB4800 selects 4800 bps at serial port.
$SB9600 selects 9600 bps at serial port.
$SB19200 selects 19200 bps at serial port.
$SB38400 selects 38400 bps at serial port.
$SB57600 selects 57600 bps at serial port.
$SB115200 selects 115200 bps at serial port.
COMMAND:
VALUES:
$SPn
n = 0 or 1
DEFAULT:
$SP0
DESCRIPTION:
$SP0 disables UUCP spoofing.
$SP1enables UUCP spoofing.
COMMAND:
VALUES:
&SFn
n = 0 or 1
DEFAULT:
&SF0
DESCRIPTION:
&SF0 selects DSR follows CD.
&SF1 selects DSR independent.
COMMAND:
VALUES:
&Sn
n = 0, 1 or 2
DEFAULT:
&S1
DESCRIPTION:
&S0 forces Data Set Ready On.
&S1 lets Data Set Ready act normally.
&S2 Data Set Ready drop is regulated by S24 on
disconnect.
COMMAND:
VALUES:
T
n/a
DEFAULT:
Tone Dial
DESCRIPTION:
Modem will tone-dial numbers following the T.
COMMAND:
&Tn
40
Chapter 4 - Commands
VALUES:
DEFAULT:
n = 4 or 5
&T5
DESCRIPTION:
&T4 selects Enable Response to Request for Remote
Digital Loopback.
&T5 selects Disable Response to Request for Remote
Digital Loopback.
COMMAND:
VALUES:
#Tn
n = 0 or 1
DEFAULT:
#T1
DESCRIPTION:
#T0 turns off Trellis Coded Modulation
#T1 turns on Trellis Coded Modulation
COMMAND:
VALUES:
Un
n = 0, 1, 2, or 3
DEFAULT:
n/a
DESCRIPTION:
U0 places modem in Analog Loop Originate Mode.
U1 places modem in Analog Loop Answer Mode.
U2 places modem in Remote Digital Loopback test mode.
U3 places modem in Local Digital Loopback Test Mode.
COMMAND:
VALUES:
Vn
n = 0 or 1
DEFAULT:
V1
DESCRIPTION:
V0 means Result Codes sent as digits(terse response).
V1 means Result Codes sent as words (verbose response).
COMMAND:
VALUES:
W
n/a
DEFAULT:
n/a
DESCRIPTION:
Wait for new dial-tone.
COMMAND:
VALUES:
&Wn
n = 0 or 1
DEFAULT:
&W1
DESCRIPTION:
&W0 causes modem to store its current parameters in non-
volatile RAM, and modem will load these for future
sessions instead of reading factory ROM defaults, unless
&F command used.
&W1 causes modem to not store parameters.
COMMAND:
VALUES:
Xn
n = 0, 1, 2, 3 or 4
41
Chapter 4 - Commands
DEFAULT:
X0
DESCRIPTION:
X0 selects Basic Result Codes (w/o CONNECT 1200,
CONNECT 2400).
X1 selects Extended Result Codes (w/CONNECT 1200,
CONNECT 2400).
X2 selects Standard AT Command set with NO DIAL
TONE.
X3 selects Standard AT Command set with BUSY.
X4 selects Standard AT Command set with NO DIAL
TONE and BUSY.
COMMAND:
VALUES:
#Xn
n = 0 or 1
DEFAULT:
#X0
DESCRIPTION:
#X0 selects single XOFF character sent until XON level
returns.
#X1 selects multiple XOFF characters after buffer level is
full.
COMMAND:
VALUES:
Yn
n = 0 or 1
DEFAULT:
Y0
DESCRIPTION:
Y0 disables sending or responding to long space “break”.
Y1 enables sending or responding to long space “breaks”.
COMMAND:
VALUES:
Z
n/a
DEFAULT:
n/a
DESCRIPTION:
All configuration parameters are reset to default values.
COMMAND:
VALUES:
, (Comma)
n/a
DEFAULT:
n/a
DESCRIPTION:
Causes pause during dialing.
COMMAND:
VALUES:
;(Semi-Colon)
n/a
DEFAULT:
n/a
DESCRIPTION:
Causes return to Command Mode after dialing.
COMMAND:
VALUES:
! (Exclamation)
n/a
DEFAULT:
n/a
DESCRIPTION:
Causes modem to flash On-Hook.
COMMAND:
VALUES:
@
n/a
42
Chapter 4 - Commands
DEFAULT:
n/a
DESCRIPTION:
Causes modem to wait for ringback, then 5 seconds of
silence before processing next part of command.
COMMAND:
VALUES:
+++AT<CR>
n/a
DEFAULT:
n/a
DESCRIPTION:
In-band Escape Sequence. Places modem in Command
mode while still remaining On-Line. Enter +++ followed by
the letters A and T, up to ten command characters, and a
RETURN.
COMMAND:
VALUES:
BREAK AT<CR>
n/a
DEFAULT:
n/a
DESCRIPTION:
Out-of-band Escape Sequence. Places modem in
Command mode while still remaining On- Line. Not
preceded by AT. Enter a BREAK signal, followed by the
letters A and T, up to sixty command characters, and hit
RETURN.
COMMAND:
VALUES:
*C <Enter>
0, 1, 2
DEFAULT:
0
DESCRIPTION:
Caller ID Reporting the Call Traffic Window displays the
phone number and name of the caller (if the caller's phone
line supports Caller ID). The call must be answered after
the second ring to receive the information. This feature
requires a modem hardware upgrade, Caller Id-enabled
phone lines, and firmware version greater than 8.07a or
2.07a. The firmware is disabled by default, enabled by the
*C command.
4.1.1 Callback Security Commands
COMMAND:
VALUES:
#DBn
n= 0, 1, or 2
DEFAULT:
DB0
DESCRIPTION:
#DB0 disables Callback Security and answering Yes to the
prompt turns off Callback Security and erases stored phone
numbers and passwords. Answering No to the prompt
aborts the command.
#DB1 activates remote and local password security.
#DB2 activates remote password security.
COMMAND:
VALUES:
#CBNyyxxxxxx
n/a
43
Chapter 4 - Commands
DEFAULT:
n/a
DESCRIPTION:
Callback password with xxxxxx being callback password
and yy being the memory location. Callback password
xxxxxx must start with a non-numeric character and upper/
lower case sensitive. Callback password xxxxxx must be a
mini mum of 6 and maximum of 10 characters. yy memory
locations are from 0 to 29. Must T (tone) dialing in string.
COMMAND:
VALUES:
+ - Dxxxxxx???Nxx
n/a
DEFAULT:
n/a
DESCRIPTION:
Callback Phone Numbers xxxxxx with the + preceding the
phone number indicating the callback modem phone
number for the corresponding password at the same
memory location. The (-) preceding the phone number
enables direct entry when the caller uses the correct
password without the callback modem having to return the
call. The ??? entry at the end of the phone number
represents an extension added to the main phone number.
The Nxx is the memory location of the callback phone
number and password.
COMMAND:
VALUES:
#Pn
n= 0, 1, or 2
DEFAULT:
#P0
DESCRIPTION:
Parity of the prompt messages sent by the callback
modem.
#P0 is no parity.
#P1 is odd parity.
#P2 is even parity.
COMMAND:
VALUES:
#RCBNxx
n/a
DEFAULT:
n/a
DESCRIPTION:
Erases the callback password stored at memory location
xx. Memory locations are 0 to 29.
COMMAND:
VALUES:
#RDNxx
n/a
DEFAULT:
n/a
DESCRIPTION:
Erases the callback phone number stored at memory
location xx. Memory locations are 0 to 29.
44
Chapter 4 - Commands
4.1.2 Remote Configuration
The Remote Configuration feature is a network management tool that
allows you to configure modems remotely. This means you could configure
modems anywhere in your network from one location without having to visit
the sites or rely on remote users to follow your instructions. With Remote
Configuration, which is protected by two level security, you can downline
load new parameters, program new V.42 capabilities and implement new
features. Remote Configuration also makes troubleshooting a remote
location a lot easier.
The way Remote Configuration works is that S-Register S13 has been set-
up to contain the special Remote Configuration escape code. When
calling a Remote Configuration equipped modem, you enter the proper
Remote Escape code to enable entering your Set-up Password. After
entering it, you can then execute AT commands as if you were connected
locally. If you set S-Register S13 to zero, Remote Configuration is
disabled.
4.1.3 Remote Configuration Procedures
The procedures for using the Remote Configuration features are the same
whether or not a call originates from the remote modem. Once the modem
is on-line, perform the procedure below.
1. Remote Escape Configuration requires %%%<CR> to be sent if the
default value in S-Register S13 has not been changed. The modem
responds with:
1. - DATA Mode
2. - COMMAND Mode
2. You then select 1 or 2. With 1, the modem goes back into data mode
and with 2, the modem responds with the following:
Password>
3. Enter your Set-up Password, and if the code is correct the modem
responds with:
OK
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Chapter 4 - Commands
You can now use any AT commands of the modem being remotely
configured as if they were being entered locally. You cannot change the
Set-up of the LOGIN Password until you enter the proper LOGIN
Password.
4. When you are done entering AT commands and you want to exit, type
AT0 and hit RETURN. The modem responds with:
1. DATA Mode
2. COMMAND Mode
5. Enter a 1 to go back on-line with your computer, or enter 2 and the
correct password to talk to your modem.
Password Commands
COMMAND:
VALUES:
#Ixxxxxxxxxx
n/a
DEFAULT:
#IMULTITECH
DESCRIPTION:
Login Password is any keyboard characters (x) (upper/
lower case sensitive), minimum 6 and maximum 10
characters. The default Login Password is MULTI-TECH.
COMMAND:
VALUES:
#Syyyyyyyyyy
n/a
DEFAULT:
#SMODEMSETUP
DESCRIPTION:
Set-up Password is any keyboard characters (y) (upper/
lower case sensitive), minimum 6 and maximum 10
characters. The default Set-up Password is
MODEMSETUP.
4.1.4 V.25bis Commands
COMMAND:
VALUES:
$Vn
n= 0, 1, 2, 5, or 6
DEFAULT:
$V0
DESCRIPTION:
$V0 returns modem to AT command mode when in V.25bis
mode.
$V1 enables V.25bis mode of operation.
$V2 allows modem to receive one V.25bis command while
in AT command mode without leaving AT command mode.
$V5 DSR follows DTR in V.25bis mode.
$V6 DSR does not follow DTR in V.25bis mode.
46
Chapter 4 - Commands
COMMAND:
VALUES:
CSPs
n/a
DEFAULT:
n/a
DESCRIPTION:
The CSP command will change the serial baud rate of your
modem by entering CSPsssss where sssss can equal:
CSP0300 - 300 bps
CSP1200 - 1200 bps
CSP2400 - 2400 bps
CSP4800 - 4800 bps
CSP9600 - 9600 bps
CSP19200 - 19200 bps
CSP38400 - 38400 bps
CSP57600 - 57600 bps
CSP115200 - 115200 bps
COMMAND:
VALUES:
CRNdd
n/a
DEFAULT:
n/a
DESCRIPTION:
Dials phone number dd where dd can be up to 20
characters (0 through 9, *, #, P, T and :). Phone number is
checked against the Delayed and Forbidden Number lists
before dialed.
COMMAND:
VALUES:
CRIdd;nn
n/a
DEFAULT:
n/a
DESCRIPTION:
Dials dd same as CRN Command and ignores nn
identification string.
COMMAND:
VALUES:
DIC or CIC
n/a
DEFAULT:
n/a
DESCRIPTION:
The disregard or connect to incoming calls commands are
used for auto-answer operations. DIC stops the modem
from answering incoming calls. CIC causes the modem to
answer incoming calls.
47
Chapter 4 - Commands
4.2
S-Registers
Certain Command Mode configurations are stored in memory registers
called, S-Registers. The S command is used to assign a value to, and to
read the current value of an S-Register.
To assign a value to an S-Register, enter the letter S, followed by the S-
Register number and an equals sign (=), and then a decimal response to
the message “ENTER THE NEW VALUE IN DECIMAL FORMAT”.
To read an S-Register value, enter the letter S followed by the S-Register
number and a question mark (?), then hit RETURN. To verify that the S-
Register value was entered correctly, enter for example, ATS8? and hit
RETURN. You should receive a response of the assigned value given to
that S-Register.
S0
Number of Rings Until Modem Answers
Unit:
1 ring
Range:
Default:
Description:
0-255
1
Sets the number of rings before the modem answers.
S1
Rings Which Have Occurred
Unit:
1 ring
Range:
Default:
Description:
0-255
0
Counts the number of rings that have occurred.
S2
Escape Code Character
Unit:
ASCII Character
Range:
0-127
Default:
43 (+ sign)
Description:
Defines the escape code character.
S3
Return Character
Unit:
ASCII Character
Range:
0-127
Default:
13
Description:
Defines the character recognized as Carriage Return
(RETURN) or “Enter”.
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Chapter 4 - Commands
S4
Line Feed Character
Unit:
ASCII Character
Range:
Default:
0-127
10
Description:
Defines the character recognized as LINE FEED.
S5
Backspace Character
Unit:
ASCII Character
Range:
0-127
Default:
8
Description:
Defines the character recognized as BACKSPACE.
S6
Wait Time for Dial Tone
Unit:
1 second
Range:
2-255, 4-255**
Default:
2, 4**
Description:
Sets the time the modem waits after the RETURN key is
pressed before executing a dial command.
S7
Time for Carrier (Abort Timer)
Unit:
1 second
Range:
Default:
Description:
1-255, 1-45*
45
Defines the Abort Timer (lack of carrier) delay time.
S8
Pause Time for Comma
Unit:
1 second
Range:
0-255, 4-255**
Default:
2, 4**
Description:
Sets the length of the pause caused by a comma inserted
in a dialing commarnational and DOC units
S9
Carrier Detect Response Time
Unit:
100 mSec.
Range:
Default:
Description:
1-255
6
Sets the time delay for when the modem first detects a
valid incoming carrier signal and when the modem turns on
its Carrier Detect circuit.
** Value for International Units only
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Chapter 4 - Commands
S10
Carrier Loss Disconnect Delay Time
Unit:
100 mSec.
Range:
Default:
Description:
0-255
7
Sets the time a carrier signal must be lost before the
modem disconnects.
S11
Tone Dialing: Tone Spacing and Duration
Unit:
1 mSec.
Range:
Default:
Description:
1-255, 80-255*
70, 80*
Sets the time duration of spacing between tone in tone-
dialing.
S13
Remote Configuration Escape Character
Unit:
ASCII Character
Range:
Default:
Description:
0-127
37 (% sign)
Defines the remote configuration escape character.
S16
Callback Attempts
Unit:
1 Attempt
Range:
1-255
Default:
4
Description:
S16 defines the number of attempts allowed after initial
passwords have been exchanged between modems.
S17
Changing Break Time
Unit:
10 mSec.
Range:
0-2.5 sec
Default:
250
Description:
S17 defines the break time (space) to local PC.
S24
PBX/CBX Disconnect Drop Time for DSR/CTS/CD
Unit:
50 mSec.
Range:
Default:
Description:
0-255
20
Defines DSR/CTS/CD dropout time. The default of 20
equals one second.
50
Chapter 4 - Commands
S25
DTR Dropout Time
Unit:
100 mSec.
Range:
Default:
0, 1 through 255
0
Description:
Defines DTR dropout time. 0 default equals 50ms.
S26
Failed Password Attempts
Unit:
1 failed attempt
Range:
Default:
Description:
0-255
0
Counts the number of times there has been a failed
password attempt.
S29
Local Inactivity Timer
Unit:
minutes
Range:
1-255
Default:
20
Description:
Defines the amount of idle time that can elapse between
AT commands after the SETUP password has been
entered.
S30
Inactivity Timer
Unit:
1 minute
Range:
0-255
Default:
0
Description:
Inactivity timer used to disconnect the modem.
S32
Time Elapse for Escape Sequence
Unit:
1 second
Range:
Default:
Description:
0-255
20
Sets the duration in which modem waits for a <CR> to be
entered during escape sequence execution.
S34
Buffer Length of Command Mode...After On-line Escape Sequence
Unit:
ASCII Character
Range:
Default:
Description:
0-60
10
Sets buffer length of command mode after on-line escape
sequence.
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Chapter 4 - Commands
S36
Time Between DTR Inactive and Modem Off-Hook
Unit:
1 Second
Range:
Default:
Description:
0-255 seconds
0
Sets the time between DTR inactive (low) and the modem
going off-hook. The DTR Busy-out feature is disabled with
S36=0.
S37
Time Between DTR Active and Modem On-Hook
Unit:
1 Second
Range:
Default:
Description:
0-255 seconds
5
Sets the time between DTR being active and the modem
going on-hook (not busy).
S48
Program V34 Connect Speeds
Unit:
N/A
Range:
Default:
Description:
33, 31, 28, 26, 24, 21,19,16,14,12, 96 and 48
0
Defines which speed modem connects within Enhanced
V.34 mode scope (e.g., S48 = 21 means maximum connect
speed is 21.6K). This register is when line conditions will
not support higher Enhanced V.34 speeds (e.g., 33.6K,
31.2K, 28K, 26.4K, 24K...) The modem default is a value
of 0, which indicates a connection attempt of 33.6K.
4.3
Result Codes
The MT2834BR Command mode provides you with several responses, or
“Result Codes”, that can aid you in Command mode operation. These
Result Codes are displayed on your video monitor.
AT&Q0
Selects Multi-Tech responses with Reliable/Compression
modifiers. The terse result code for CONNECT 2400 is 9.
AT&Q1
selects Standard AT command set responses. The terse
result code for CONNECT 2400 is 10.
Table 4-1: &Q0 "Multi-Tech" Result Codes
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Chapter 4 - Commands
TERSE VERBOSE
0
OK
1
CONNECT
2
RING
3
NO CARRIER
ERROR
4
5 *
6
CONNECT 1200
NO DIALTONE
BUSY
7
8
NO ANSWER
CONNECT 2400
CONNECT 4800
CONNECT 9600
CONNECT 14400
CONNECT 19200
CONNECT 21600
CONNECT 24000
CONNECT 26400
CONNECT 28800
CONNECT 31200
CONNECT 33600
9 *
11 *
12 *
13 *
19 *
21 *
24 *
26 *
28 *
31 *
33 *
* With MNP error correction on, RELIABLE (or R) is added to these result codes.
With LAP-M error correction on, LAP-M (or L) is added to these result codes.
With data compression on, COMPRESSED (or C) is added. (Note these
"Extended" Result Codes are displayed when your modem is set-up to do so
with an X1, X2, X3, or X4 command.)
Table 4-2: &Q1 "Standard AT" Result Codes
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Chapter 4 - Commands
TERSE VERBOSE
0
OK
1
CONNECT
2
RING
3
NO CARRIER
ERROR
4
5
CONNECT 1200
NO DIAL TONE
BUSY
6
7
8
NO ANSWER
CONNECT 2400
CONNECT 4800
CONNECT 9600
CONNECT 14400
CONNECT 19200
CONNECT 21600
CONNECT 24000
CONNECT 26400
CONNECT 28800
CONNECT 31200
CONNECT 33600
10
11
12
13
19
21
24
26
28
31
33
* Error Correction/Data Compressed modifiers are not displayed with Standard
AT Result Codes.
54
Chapter 4 - Commands
4.3.1 AT Commands and S-Register Summary
The vast majority of installations are similar, with the MT2834 being used
to dial up a remote installation where the call is automatically answered.
Your MT2834 has a default configuration to dial another 33,600 bps
modem that support error correction, data compression and flow control. If
the answering modem is not compatible, the MT2834 can match protocols,
provided the protocols are industry standard (i.e., ITU-T or Bell) and not
proprietary.
The &W command, used in conjunction with specific other AT commands
and S-Registers, can reconfigure the MT2834 to conform to a specific
application. The MT2834 can store its configuration parameters and S-
Register values in its nonvolatile memory.
The command AT&W0 (or AT&W) causes the modem to store its current
parameters in its nonvolatile RAM. The command also sets the modem
upon power up, or when it is reset with an ATZ command, the modem
reads all its configuration and S-Register parameters from RAM, and not
from the factory settings in ROM (note you may recall factory installed
defaults by entering AT&F8&W0). The &W command changes the
configuration parameters stored in RAM that you specifically intend to alter.
All other default parameters remain unchanged.
The AT&W1 command sets the modem so that it does not store its
parameters in RAM, and on power up or when an ATZ command is issued,
parameters are read from the factory default settings in ROM.
Before using the &W command, you may want to view the modem's
current operating parameters. Use the ATL5, ATL6 and ATL7 commands
to display the current modem configuration.
55
Chapter 5 - Modem Testing
Chapter 5 - Testing the Modem
Local Analog Loopback Test/V.54 Loop 3
5.1
In this test, data from your computer or terminal is sent to your modem's
transmitter, converted into analog form, looped back to the receiver,
converted into digital form and then received back at your monitor for
verification. No connection to the phone line is required. See Figure 5-1.
Computer or Terminal
Local MultiModem
UUUU
Digital
Analog
Type ATU0 or ATU1,
then ENTER
Figure 5-1. Local Analog Loopback Test
The test procedure is as follows:
1. Connect the modem to your computer. With your communication
software, set the desired baud rate.
2. Type ATU0 (or ATU) and hit ENTER. This places your modem in
Analog Loopback mode, in the Originate mode. The modem is now out
of the Command mode and in a pseudo On-Line mode.
3. Once you receive a connect message (if responses are enabled), enter
data from your keyboard. For this test, typing multiple upper case "U"
characters is a good way to send an alternating test pattern of ones and
zeros.
4. For a more complete test, you should also test the modem in Answer
mode. To do this, you must “escape” from Originate mode by entering
an Escape Sequence (+++AT<CR> or <BREAK>AT<CR>) . Then type
57
Chapter 5 - Testing the Modem
ATU1 and hit ENTER to place the modem in Analog Loopback mode, in
the Answer mode. Then repeat step 3.
5. When testing is completed, you may exit Answer mode by entering an
Escape Sequence (+++AT<CR> or <BREAK>AT<CR>), which returns
the modem to Command mode.
6. Your modem passes this test if the data entered from your keyboard are
the same as the data received on your monitor. If different data is
appearing on your monitor, your modem is probably causing the
problem, although it could also be your computer. If your modem
passes this test, but you are receiving errors while On-line, the remote
modem or the phone line could be at fault.
5.2
Digital Loopback Test/V.54 Loop 2 (Local/Manual)
The Digital Loopback Test is an on-line test that loops data sent from one
modem across the phone line to another modem, then back to the first
modem. See Figure 5-2.
There are two ways to put a modem into Digital Loopback mode.
1. Locally or Manually, described here in section 5.2.
2. Remotely or Automatically, see section 5.3.
Note: Loopback tests operate at all speeds except 300 bps. Disable error
correction (&E0&W0<CR>) before engaging in loopback tests.
In this test the local modem is placed in Digital Loopback mode. Data is
entered and transmitted from the remote modem (which is not in digital
loopback mode), sent across the phone line to the local modem and
looped back to the remote modem.
The test procedure is as follows:
1. Go into Terminal mode. Type AT and hit ENTER; you should get an OK
message.
58
Chapter 5 - Testing the Modem
2. Dial the remote modem by entering the Dial command and the phone
number, to establish On-line mode.
3. Type the Escape Sequence (+++AT<CR> or <BREAK>AT<CR>) which
brings your modem into Command mode, while still maintaining the
pseudo On-line mode with the remote modem.
4. Type ATU3 from the local PC and hit ENTER. Once you receive an OK
message from your modem (if responses are enabled), the local
modem is placed in Digital Loopback mode.
5. Data is typed from the remote keyboard. For this test, typing multiple
upper case "U" characters is a good way to send an alternating test
pattern of ones and zeros. The data received by the local modem will
enter its analog receiver, be converted to digital data, be reconverted
into analog, and then looped through its transmitter back to the remote
modem. Your modem passes this test if the data entered from the
remote keyboard is the same as the data received on the remote
monitor.
Computer or Terminal
Computer or Terminal
UUUU
Local Modem
Remote Modem
Digital Analog
Analog
Digital
Figure 5-2. Digital Loopback Test (local / manual)
6. When testing is complete, you may end the test by typing an Escape
Sequence (+++AT<CR> or <BREAK>AT<CR>) to bring your modem
into Command mode. The modem should respond with an OK
message. If you wish to stay On-line with the remote modem for normal
data transmission, type AT0 and hit ENTER. If you wish to terminate
the call, type ATH and hit ENTER to hang up.
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Chapter 5 - Testing the Modem
5.3
Digital Loopback Test/V.54 Loop 2
(Remote/Automatic)
In this test, your modem must be On-line with another modem set up to
respond to a request for Digital Loopback. The test is as follows:
1. Enter Terminal mode.Type AT and hit ENTER. An OK message
displays.
2. Dial the remote modem by entering the Dial command and the phone
number, to establish On-line mode.
Note:
Set the &T4 command on the remote modem prior to running test.
3. Type the Escape Sequence (+++AT<CR> or <BREAK>AT<CR>) to
enter Command mode, maintaining the remote modem connection.
4. Type ATU2 and hit ENTER. The local modem transmits an
unscrambled marking signal. The remote modem enters Digital
Loopback mode. The local modem exits Command mode and enters
pseudo On-line mode.
5. Type multiple uppercase "U" characters to send an alternating test
pattern of ones and zeros. The data received by the remote modem
enters the analog receiver and is converted to digital data. The data is
reconverted into analog, then looped through the transmitter back to the
local modem. If the data entered from the keyboard is the same as the
data received on the monitor, the modem has passed the test.
Computer or Terminal
Computer or Terminal
UUUU
Local Modem
Remote Modem
Digital Analog
Analog Digital
Figure 5-3. Digital Loopback Test (remote / automatic)
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Chapter 5 - Testing the Modem
5.4
Local Analog Loopback Test (Synchronous Mode)
To initiate the Local Analog Loopback Test, with the modem in
Synchronous mode:
1. Enter AT&M1U. This first switches your modem from asynchronous to
synchronous mode, and places it into the Analog Loopback/Originate
mode. The modem is now out of the Command mode and in the
pseudo On-Line mode.
2. Once you receive a connect message (if responses are enabled), enter
data from your keyboard. For this test, typing multiple upper case "U"
characters is a good way to send an alternating test pattern of ones and
zeros.
3. For a more complete test, you should also test the modem in Answer
mode. To do this, pull out and then reinsert modem card in rack cage.
Then type AT&M1U1 and hit ENTER to place the modem in Analog
Loopback mode, in the Answer mode. Then repeat step 2.
Computer or Terminal
Local MultiModem
UUUU
Digital
Analog
Figure 5-4. Local Analog Loopback Test (Syncronous Mode)
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Chapter 5 - Testing the Modem
5.5
Digital Loopback Test (Local/Manual)
(Synchronous Mode)
This test must be run when you have a data connection with another
modem. To initiate the Digital Loopback Test (local/manual), DIP-Switch #9
must be in the UP position, then place DIP-Switch #16 in the opposite
position it is currently (the modem requires a state of change in Switch #16
to activate Loopback tests). Once you receive an OK message from your
modem (if responses are enabled), the local modem is placed in Digital
Loopback mode.
To exit the Digital Loopback Test (local/manual), pull out and then reinsert
modem card into modem card cage.
Computer or Terminal
Computer or Terminal
UUUU
Local Modem
Remote Modem
Digital Analog
Digital
Analog
Figure 5-5. Digital Loopback Test
(local / manual) (Syncronous)
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Chapter 5 - Testing the Modem
5.6
Digital Loopback Test (Remote/Automatic)
(Synchronous Mode)
This test must be run when you have a data connection with another
modem. To initiate the Digital Loopback Test (remote/automatic), DIP-
Switch #9 must be in the DOWN position, then place DIP-Switch #16 in the
opposite position it is currently (the modem requires a state of change in
Switch #16 to activate Loopback tests). Once you receive an OK message
from your modem (if responses are enabled), the local modem is placed in
Digital Loopback mode.
To exit the Digital Loopback Test (remote/automatic), pull out and then
reinsert modem card into modem card cage.
Computer or Terminal
Computer or Terminal
UUUU
Local Modem
Digital Analog
Remote Modem
Analog Digital
Figure 5-6. Digital Loopack Test
(remote / automatic) (Syncronous)
63
Chapter 6 - Warranty
and Service
Chapter 6 - Warranty and Service
6.1
Introduction
This chapter starts out with statements about your modem's 2-year
warranty. The next section, Tech Support, should be read carefully if you
have questions or problems with your modem. It includes the technical
support telephone numbers, space for recording your modem information,
and an explanation of how to send in your modem should you require
service. The final five sections explain how to use our Bulletin Board
Service (BBS), upgrading the MT2834BR via Flash PROM, a Safety
Warnings notice, a brief section on the CompuServe/Internet Forums and
information on Multi-Tech's Fax-Back service.
6.2
Limited Warranty
Multi-Tech Systems, Inc. (“MTS”) warrants that its products will be free
from defects in material or workmanship for a period of two years from the
date of purchase, or if proof of purchase is not provided, two years from
date of shipment. MTS MAKES NO OTHER WARRANTY, EXPRESSED
OR IMPLIED, AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY
DISCLAIMED. This warranty does not apply to any products which have
been damaged by lightning storms, water, or power surges or which have
been neglected, altered, abused, used for a purpose other than the one for
which they were manufactured, repaired by the customer or any party
without MTS’s written authorization, or used in any manner inconsistent
with MTS’s instructions.
MTS’s entire obligation under this warranty shall be limited (at MTS’s
option) to repair or replacement of any products which prove to be
defective within the warranty period, or, at MTS’s option, issuance of a
refund of the purchase price. Defective products must be returned by
Customer to MTS’s factory transportation prepaid.
MTS WILL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES AND
UNDER NO CIRCUMSTANCES WILL ITS LIABILITY EXCEED THE
PURCHASE PRICE FOR DEFECTIVE PRODUCTS.
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Chapter 6 - Warranty and Service
6.3
Tech Support
Multi-Tech has an excellent staff of technical support personnel available
to help you get the most out of your Multi-Tech product. If you have any
questions about the operation of this unit, call 1-800-972-2439. Please fill
out the modem information (below), and have it available when you call. If
your modem requires service, the tech support specialist will guide you on
how to send in your modem (see Section 6.3.2).
6.3.1 Recording Modem Information
Please fill in the following information on your Multi-Tech modem. This will
help tech support in answering your questions.
Modem Model No.: ___________________________________
Modem Serial No.: ____________________________________
Modem Firmware Version: _____________________________
COM Port#: _________________________________________
FAX Software Type and Version: ________________________
DataComm Software Type and Version: __________________
The modem model and serial numbers are silkscreened on the bottom of
your modem. The software version is printed on the System CD label. Type
ATI1 to display the modem firmware version.
Please note the status of your modem before calling tech support. This
status can include LED indicators, screen messages, diagnostic test
results, problems with a specific application, etc..
6.3.2 Service
If your tech support specialist decides that service is required, modems
may be sent (freight prepaid) to our factory. Return shipping charges will
be paid by Multi-Tech Systems.
Include the following with your modem:
• a description of the problem.
• return billing and return shipping addresses.
• contact name and phone number.
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Chapter 6 - Warranty and Service
• check or purchase order number for payment if the modem is out of
warranty. (Check with your technical support specialist for current
charges.)
• if possible, note the name of the technical support specialist with whom
you spoke.
If you need to inquire about the status of the returned product, be prepared
to provide the serial number of the product sent (see Section 6.3.1).
Send modems to this address:
MULTI-TECH SYSTEMS, INC.
2205 WOODALE DRIVE
MOUNDS VIEW, MINNESOTA 55112
ATTN: SERVICE OR REPAIRS
6.4
Upgrading the MT2834BR
The MT2834BR has a Flash PROM which contains firmware code for the
hardware and DSP code for the digital signal processor chips. At various
times, Multi-Tech may add enhancements and/or fixes to the firmware. The
flash technology used in the MT2834BR lets you load these upgrades into
the PROM or DSP chips through the modem's serial port.
6.4.1 Using FlashPro to Upgrade Modem Firmware
1. Download FLASHPRO.ZIP and a new .HEX file from the Multi-
Tech BBS.
2. Unzip the FLASHPRO.ZIP file. Place this unzipped file and the
.HEX file in the same directory.
3. Run FlashPro by typing FLASHPRO, a space, -M and hitting ENTER at
the DOS prompt.
4. Highlight the "Configure" option in the MAIN MENU and hit
ENTER. Highlight "Active Port" and select the COM port to
which you have your modem attached. Highlight "Baud Rate"
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Chapter 6 - Warranty and Service
and select the rate you want to program at. Hit ESC when
finished.
5. Highlight the "Select File to Program" option in the MAIN
MENU. Highlight the .HEX file. Hit ESC when finished.
6. Highlight "Program Firmware" option in the MAIN MENU. When you are
prompted to confirm the file to program, press "Y".
7. If you need more assistance programming FLASHPRO, then contact our
tech support department.
6.5
Safety Warnings
1. Never install telephone wiring during a lightning storm.
2. Never install telephone jacks in wet locations unless the jack is
specifically designed for wet locations.
3. Never touch uninsulated telephone wires or terminals unless the
telephone line has been disconnected at the network interface.
4. Use caution when installing or modifying telephone lines.
5. Avoid using a telephone (other than a cordless type) during an
electrical storm. There may be a remote risk of electrical shock from
lightning.
6. Do not use the telephone to report a gas leak in the vicinity of the leak.
7. Ports which are connecting to other apparatus are defined as SELV.
To ensure conformity with EN 41003, ensure that these ports are only
connected to the same type on other apparatus.
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Chapter 6 - Warranty and Service
6.6
Internet
Multi-Tech is a commercial provider on the Internet, and we retrieve
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69
Chapter 7 - BABT
Requirements
Chapter 7 - BABT Requirements
Compliance with BABT Requirements
7.1
Approved for connection to telecommunications system specified in the
instructions for use subject to the conditions set out in them.
Warning: Interconnection directly, or by way of other apparatus, of ports
marked "SAFETY WARNING see instructions for use" with ports marked or
not so marked may produce hazardous conditions on the network. Advice
should be obtained from a competent engineer before such a connection is
made.
This apparatus has been approved for the use of the following facilities:
• Auto-calling
• Loop disconnect and MF dialing
• Phone number storage and retrieval by a predetermined code
• Operation in the absence of proceed indication
• Automatic storage of last number dialed
• Tone detection-busy
• Auto clear from the originating end
• DTR dialing
• Modem
• PBX timed break register recall
71
Chapter 7 - BABT Requirements
7.1.1 European Low Voltage Directive
When correctly installed and maintained, the modem will present no
hazard to the user. When correctly installed the modem will be connected
to the PSTN or a PW and to a Data Terminal Equipment (DTE), whose
modem connections comply with CCITT recommendation V28. The DTE
connections are therefore taken to be safe voltages (less than ± 30 volts).
The main power source shall be installed near to the equipment and shall
be easily accessible. The plug that connect to the apparatus to the main
power supply must be fitted with a 5A fuse that complies with BSI1362.
Ports which are capable of connecting to other apparatus are defined as
SELV. To ensure conformity with EN 41003, ensure that these ports are
only connected to ports of the same type on other apparatus.
7.1.2 Compliance with BS6305 Clause 6.2, BS6320
Clause 7.2, and BABT/SITS/82/005S/D
a. The modem is suitable for connection to the Public Switched Telephone
Network (PSTN) provided by British Telecommunications plc or
Kingston Communications (Hull) plc. Circuit supply by British
Communications, Mercury Communication, or Hull City Council. Only
direct exchange lines may be used, not shared service.
b. The modem is suitable for household, office, and similar general indoor
use. It is not suitable for use as an extension to a payphone.
c. BT lines supplied must support either loop disconnect or multifrequency
tone signalling.
d. REN (Ringer Equivalence Number).
The REN value of a unit is calculated from 3/n where n is the total number
of units which can be connected in parallel which will still cause the
standard bell (as defined in BS6305 Appendix D) to ring.
REN values of less than 0.3 cannot be assigned.
REN = 1
72
If a telephone or other device is connected in parallel with the modem, the
combined REN must not exceed 4. A BT supplied telephone may be
assumed to have REN of 1.0 unless otherwise noted.
The approval of this modem for connection to the British Telecom public
switched telephone network is INVALIDATED if the apparatus is subject to
any modification in any material way not authorized by BABT or if it is used
with or connected to:
i. internal software that has not been formally accepted BABT.
ii. external control software or external control apparatus which cause the
operation of the modem associated call set-up equipment to contravene
the requirements of the standard set out in BABT/SITS/82/005S/D.
All other apparatus connected to this modem and thereby connected
directly or indirectly to the British Telecom public switched telephone
network must be approved apparatus as defined in Section 22 of the
British Telecommunications Act 1984.
The REN number for this apparatus = 1
7.1.3 Compliance with BS6789: Section 3.1 and Part 2
a. The modem is not capable of allowing Auto Call using '999' or other PABX
emergency numbers.
b. Modes other than modes 1, 2, or 3 should not be used on the BT PSTN.
This modem is a mode 1 device.
c. Users are advised to check the numbers entered during the Auto Call set
up phase prior to dialing.
d. The user should not issue any sequence of commands to the modem
which would cause the modem to exceed the maximum allowable pause
of 8 seconds from the time the modem goes off hook until dialing begins.
e. For correct operation of the call progress monitor, the power has to be
properly connected and switched on.
Chapter 7 - BABT Requirements
7.1.4 Compliance with BS6328 Part 1
a. The modem is not suitable for use on circuits with British
Telecommunications signaling at a normal frequency of 2280 Hz.
b. The modem does not require signaling or otherwise employ the frequency
range dc to 200 Hz.
c. The modem may be connected to a point to point two-wire or four-wire
Private Circuit.
d. The modem does not require dc from the Private Circuit for correct
operation. The modem may be damaged if connected, in a private circuit
mode, to a circuit supplying dc current (the maximum permissible direct
current is zero amps).
74
Appendices
Appendix A
Appendix A
FCC Regulations for Telephone Line Interconnection
1. This equipment complies with Part 68 of the Federal Communications
Commission (FCC) rules. On the outside surface of this equipment is a
label that contains, among other information, the FCC registration
number and ringer equivalence number (REN). If requested, this
information must be provided to the telephone company.
2. As indicated below, the suitable jack (Universal Service Order Code
connecting arrangement) for this equipment is shown. If applicable, the
facility interface codes (FIC) and service order codes (SOC) are shown.
An FCC-compliant telephone cord and modular plug is provided with
this equipment. This equipment is designed to be connected to the
telephone network or premises wiring using a compatible modular jack
which is Part 68 compliant. See installation instructions for details.
3. The ringer equivalence number (REN) is used to determine the quantity
of devices which may be connected to the telephone line. Excessive
REN’s on the telephone line may result in the devices not ringing in
response to an incoming call. In most, but not all areas, the sum of the
REN’s should not exceed five (5.0). To be certain of the number of
devices that may be connected to the line, as determined by the total
REN’s, contact the telephone company to determine the maximum REN
for the calling area.
4. If this equipment causes harm to the telephone network, the telephone
company will notify you in advance that temporary discontinuance of
service may be required. But if advance notice isn’t practical, the
telephone company will notify the customer as soon as possible. Also,
you will be advised of your right to file a complaint with the FCC if you
believe it is necessary.
76
Appendix A
5. The telephone company may make changes in its facilities, equipment,
operations, or procedures that could affect the operation of the
equipment. If this happens, the telephone company will provide
advance notice in order for you to make necessary modifications in
order to maintain uninterrupted service.
6. If trouble is experienced with this equipment (the model of which is
indicated below) please contact Multi-Tech Systems, Inc. at the address
shown below for details of how to have repairs made. If the equipment
is causing harm to the telephone network, the telephone company may
request you remove the equipment from the network until the problem
is resolved.
7. No repairs are to be made by you. Repairs are to be made only by
Multi-Tech Systems or its licensees. Unauthorized repairs void
registration and warranty.
8. This equipment cannot be used on public coin service provided by the
telephone company. Connection to Party Line Service is subject to
state tariffs. (Contact the state public utility commission, public service
commission or corporation commission for information.)
9. If so required, this equipment is hearing-aid compatible.
Manufacturer:
Model Number:
FCC Registration #:
Multi-Tech Systems, Inc.
MT2834BR
AU7USA-20673-MM-E
Ringer Equivalence: 0.3B
Modular Jack (USOC) RJ11C or RJ11W (single line)
Service Center in US: Multi-Tech Systems Inc.
2205 Woodale Drive
Mounds View, MN 55112
Voice (763) 785-3500
FAX (763) 785-9874
77
Appendix A
Canadian Limitations Notice
Notice: The ringer equivalence number (REN) assigned to each terminal
device provides an indication of the maximum number of terminals allowed
to be connected to a telephone interface. The termination of a interface
may consist of any combination of devices subject only to the requirement
that the sum of the ringer equivalence numbers of all the devices does not
exceed 5.
Notice: The Industry Canada label identifies certificated equipment. This
certification means that the equipment meets certain telecommunications
network protective, operational and safety requirements. The Industry
Canada does not guarantee the equipment will operate to the user’s
satisfaction.
Before installing this equipment, users should ensure that it is permissible
to be connected to the facilities of the local telecommunications company.
The equipment must also be installed using an acceptable method of
connection. The customer should be aware that compliance with the above
conditions may not prevent degradation of service in some situations.
Repairs to certified equipment should be made by an authorized Canadian
maintenance facility designated by the supplier. Any repairs or alterations
made by the user to this equipment, or equipment malfunctions, may give
the telecommunications company cause to request the user to disconnect
the equipment.
Users should ensure for their own protection that the electrical ground
connections of the power utility, telephone lines and internal metallic water
pipe system, if present, are connected together. This precaution may be
particularly important in rural areas.
Caution: Users should not attempt to make such connections themselves,
but should contact the appropriate electric inspection authority, or
electrician, as appropriate.
78
Appendix B
Appendix B
Technical Specifications
Your MT2834BR/BRL data/fax modem meets the specifications listed
below:
Model Numbers
MT2834BR, MT2834BRI, MT2834BR-MAC
Data Rates (modem)
33600, 31200, 28800, 26400, 24000, 21600,
19200, 16800, 14400, 12000, 9600, 7200,
4800, 2400, 1200, 0-300 bps
Data Rates (fax)
Data Format
14400, 9600, 7200, 4800 bps
Serial, binary, asynchronous at 0-300, 1200,
2400, 4800 , 7200, 9600, 14400, 16800, 19200,
21600, 24000, 26400, 28800, 31200, 33600
bps; synchronous at 1200, 2400, 4800, 7200,
9600, 14400, 16800, 19200, 21600, 24000,
26400, 28800, 31200, 33600 bps
Compatibility
ITU V.42bis, V.42, Pending ITU Enhanced V.34
approval, V.34, ITU V.32bis, V.32, V.21*,
V.22bis, V.22, V.23*,V.25bis, Bell 212A and
103/113, ITU V.17, Group 3 T.4, T.30 and EIA
TR-29 Class 2 (*V.21/V.23 Int'l models only)
Error Correction
V.42 (LAP-M or MNP 3 & 4) error correction
Data Compression
V.42bis, (4:1 throughput) or
MNP 5 (2:1 throughput) data compression
Speed Conversion
Serial port data rates adjustable to 300, 1200,
2400, 4800, 9600, 19200, 38400, 57600 and
115200 bps
79
Appendix B
Flow Control
Options
Xon/Xoff, Hardware RTS/CTS, ENQ/ACK,
Unix-to-Unix Copy Protocol (UUCP) "Spoofing"
Mode of Operation
Full duplex over both dial-up lines and 2-wire
leased lines; automatic or manual dialing,
automatic or manual answer
Intelligent Features
Fully “AT command” compatible, micro-
processor controlled remote configuration, EIA
extended Automode, adaptive line probing,
automatic symbol rate and carrier frequency
during start-up, retrain and rate renegotiation,
autodial, redial, repeat dial, dial linking, pulse or
tone dial, dial pauses, call status display, auto-
parity and data rate selection, keyboard-
controlled modem options, non-volatile memory
and on-screen displays for modem option
parameters and up to ten telephone numbers/
command lines of up to 60 digits each, help
menus
Command Buffer
Modulation
60 characters
Trellis Coded Modulation (TCM) at 33600,
31200, 28800, 26400, 24000, 21600, 19200,
16800, 14400, 12000 and 9600 bps, Quadrature
Amplitude Modulation (QAM) at 9600 (non-
trellis), 4800 and 2400 bps, PSK at 1200 bps,
FSK at 300 bps
Fax Modulations
Fax Carrier
V.21CH2 FSK at 300 bps
V.27ter DPSK at 4800 and 2400 bps
V.29 QAM at 9600 and 7200 bps
V.17 TCM at 14400, 12000, 9600, and 7200 bps
V.21CH2 (Half Duplex)
80
Appendix B
Frequencies
1650Hz Mark, 1850Hz Space for Transmit
Originate; 1650Hz Mark, 1850Hz Space for
Transmit Answer; V.27ter 1800Hz Originate/
Answer; V.29 QAM 1700Hz Originate/Answer;
V.17 TCM 1800Hz Originate/Answer
Carrier Frequencies
1800 Hz V.32/V.32bis/V.32terbo/V.34/Enhanced
V.34--33.6K/31.2K/28.8K/26.4K/24K/21.6K/
19.2K/16.8K/14.4K/12K/9.6K/7.2K/4.8K
Carrier Frequencies
2400 & 1200 bps
(V.22bis/V.22 or
Transmit Originate: 1200 Hz
Transmit Answer: 2400 Hz
Receive Originate: 2400 Hz
Receive Answer: 1200 Hz
Bell 212A Standard)
Carrier Frequencies,
300 bps
(Bell Standard)
1270 Hz Mark, 1070 Hz Space for Transmit
Originate; 2225 Hz Mark, 2025 Hz Space for
Receive Originate; 2225 Hz Mark, 2025 Hz
Space for Transmit Answer; 1270 Hz Mark,
1070 Hz Space for Receive Answer
Carrier Frequencies
V.21
980 Hz Mark, 1180 Hz Space for Transmit
Originate; 1650 Hz Mark, 1850 Hz Space for
Transmit Answer; 1650 Hz Mark, 1850 Hz
Space for Receive Originate; 980 Hz Mark, 1180
Hz Space for Receive Answer
V.23
390 Hz Mark, 450 Hz Space for Transmit
Originate; 1300 Hz Mark, 2100 Hz Space for
Transmit Answer; 1300 Hz Mark, 2100 Hz
Space for Receive Originate; 390 Hz Mark, 450
Hz Space for Receive Answer
Transmit Level
-11dBm (dial-up), -15 dBm (leased-line); dBm
level selectable with DIP-Switch #3 in leased line
setting
81
Appendix B
Frequency Stability
Receiver Sensitivity
AGC Dynamic Range
Interface
±0.01%
-43 dBm under worst case conditions
43 dB
EIA RS232C/ITU-TSS V.24
Connectors
Sixteen DB25 RS232C connectors; sixteen DB9
connectors for phone line (CC216/916/1432/
2834 Rack Modem Cabinet) or sixteen RJ11
connectors for phone line (CC1600 Rack
Modem Cabinet).
Diagnostics
Indicators
Power-on Self Test, Local Analog Loop, Local
Digital Loop, Remote Digital Loop.
LEDs for Transmit Data, Receive Data, Carrier
Detect, various speed indicators, Off Hook,
Terminal Ready, Ring Indicator, and Out of
Service (Busy)
Controls
Toggle switch for Out of Service (OOS). On-
board DIP-Switches and jumpers for various
modem options.
Operating
Temperature
0° to 50° C (32° to 120° F)
115 Volts AC, 60Hz, 0.3amp.
Power
Requirements
Power Consumption
Dimensions
Approximately 6 watts
10-1/2" long x 5-1/2" wide
1.5 pounds
Weight
82
Index
Index
British Telecommunications
Index
pic 1-74
Buffer Length of Command
Mode...After On-line
Esca 1-53
Symbols
S34 1-53
Bulletin board systems 1-
25, 1-32
Busy Out 1-16
&E0 1-32
&E1 1-32
&E14 1-31, 1-32
1.1
Technical Specifica-
tions 1-81
C
Callback Attempts 1-52
Callback Security Com-
mands 1-45
Callback Security/Remote
Configuration Com-
mands 1-45
Canadian Limitations Notice 1-
80
Card Cage 1-11
Carrier Detect 1-36
Carrier Detect Response
Time 1-51
A
Abort Timer
S7 1-51
AGC Dynamic Range 1-84
ASCII code 1-26
AT 1-25
AT command set 1-41
AT Commands and S-Register
Summary 1-57
AT&T's "call card"
S9 1-51
tones 1-34
Carrier Frequencies 1-83
Carrier Frequencies (Data) 1-
83
Auto-answer 1-26, 1-28
B
Carrier Loss Disconnect Delay
Time 1-52
Backspace Character 1-51
S5 1-51
Baud rate
Serial port 1-29
Bell/V.21 answer tone selec-
tion 1-35
S10 1-52
Carrier ON 1-19
Changing Break Time 1-52
S17 1-52
Changing Default Param-
eters 1-28
British Telecom 1-75
84
Index
Clear to Send 1-41
cleardown on disconnect 1-36
COM ports
COM2 1-29
Command Buffer 1-82
Command mode characters control 1-37
Command string 1-26
Commands
Attention code 1-25
Auto-Reliable mode 1-32
Data compression 1-31, 1-32
Modem reset 1-25
Non-Error Correction mode 1-32
Reliable mode 1-32
Compatibility 1-81
Compliance with BABT Requirements 1-73
CompuServe 1-32
Configuration Parameters 1-29
Configuring Software 1-29
Configuring Your Software 1-25
Connectors 1-84
Controls 1-84
CTS flow control 1-37
CTS follows RTS 1-41
CTS signal 1-28
D
Data Compression 1-31, 1-81
data compression enabled/disabled 1-37
Data Format 1-81
Data Rates 1-81
Data Rates (fax) 1-81
Data Rates (modem) 1-81
Data Set Ready 1-42
85
Index
Data Terminal Ready 1-19
Datacomm software 1-22, 1-
25, 1-26, 1-29, 1-30, 1-31
Configuration 1-25, 1-29, 1-
30
error correction selection 1-37
Escape Code Character 1-50
S2 1-50
Escape modes selection 1-37
European Low Voltage Direc-
tive 1-74
Diagnostics 1-84
Dial-Up and Leased Lines 1-18
Dial-Up Lines 1-18
Dialing a stored telephone 1-
40
Dialing/On-Line/Answering 1-
22
Digital Loopback Test (Syn-
chronous) 1-65
Digital Loopback Test (Remote/
Automatic) 1-65
Digital Loopback Test (Synchro-
nous Mode) 1-65
Dimensions 1-84
DIP Switches and Jumper
Settings 1-12
DIP-Switch options 1-14
DIP-Switch Settings 1-11
DSR follows CD 1-42
DTR Control 1-36
F
factory default values 1-38
Fax Carrier Frequencies 1-83
Fax Modulations 1-82
FCC Regulations for Telephone
Line Interconnection 1-78
Features 1-8
File Transfer Protocols 1-31
File transfer protocols 1-31
flash On-Hook 1-44
FlashPro to Upgrade Modem
Firmware 1-69
Flow Control 1-82
Flow control 1-28
flow control selection 1-37
Frequency Stability 1-84
G
guard tones 1-38
H
DTR Dialing 1-36
DTR Dropout Time 1-53
S25 1-53
DTR signal 1-28
Help Screen selection 1-39
How to Use This Manual 1-9
E
Enq/Ack pacing 1-37
Error 1-20
Error Correction 1-32, 1-81
Error correction 1-32
I
In-band Escape Sequence 1-
45
86
Index
Inactivity Timer 1-53
S30 1-53
Indicators 1-84
Initialization strings 1-25, 1-
28, 1-32
Macintosh 1-28
PC-compatible 1-26
Installation 1-12
Intelligent Features 1-82
Interface 1-84
MNP 5 1-31
Mode of Operation 1-82
Model Numbers 1-81
Modem AT Commands 1-34
modem baud selection 1-39
modem ID 1-39
Modem Initialization Setup 1-
27
Modem LED Indicators 1-19
Modulation 1-82
Introduction 1-8
ists operating parameters 1-
39
MSD.EXE 1-23
Multi-Tech command set 1-41
Multi-Tech responses 1-54
"Multi-Tech" Result Codes 1-
55
K
Kingston Communications (Hull)
pic 1-74
N
negotiate V.42 Mode 1-39
Noise Information 1-39
Number of Rings Until Modem
Answers
L
Lease Line Restoral 1-83
Limited Warranty 1-67
Line Feed Character 1-51
S4 1-51
S0 1-54
O
Line Probe 1-37
Login Password 1-48
long space “break 1-44
Loopback Test Enabled 1-43
Off Hook 1-19
Off Hook control 1-38
OOS (Busy Out) Toggle
Switch 1-16
Operating Temperature 1-84
Out of Service 1-17
M
Macintosh computer 1-23, 1-
28
Macintosh Initialization 1-28
maximum transmit block size
selection 1-35
P
Pacing 1-28
Parameters 1-25, 1-28
87
Index
Changing defaults 1-28
Parity 1-25
tion 1-30
reset default values 1-44
pause during dialing 1-44
Pause Time for Comma 1-51
S8 1-51
PBX/CBX Disconnect Drop
Time for DSR/CTS/CD 1-
52
Result Codes 1-41, 1-44, 1-
54
Result codes 1-26
Result Codes Terse/Verbose
selection 1-43
retransmit 1-41
S24 1-52
Return Character 1-50
S3 1-50
Return character 1-26
return to Command Mode after
dialing 1-44
PC Board Controls 1-13
PC Initialization Strings 1-26
Phone Line Connection 1-13
Power 1-84
Power Consumption 1-84
Power Requirements 1-84
Preliminaries 1-11
Program V34 Connect
Speeds 1-54
Ring Indicator 1-19
Ringer Equivalence Number 1-
74
Rings Which Have Occurred
S1 1-50
Protocols 1-31
RTS signal 1-28
pulse ratio 1-40
pulse-dial 1-40
S
S-Registers 1-50
S3 1-26
R
Receive Data 1-19
Safety Warnings 1-70
SCC 1-23
Serial Cable 1-11
Serial cable 1-28
Serial port 1-22, 1-23, 1-
29, 1-31
serial port commands 1-42
Serial Port Limitations 1-22
Service 1-68
Receiver Sensitivity 1-84
Recording Modem Informa-
tion 1-68
Remote Configuration 1-47
Remote Configuration Escape
Character 1-52
S13 1-52
Remote Configuration Proce-
dures 1-47
Sessions 1-25
Remote Digital Loopback 1-43
Remote System Configura-
Set-up Password 1-48
Signal Strength Information 1-
88
Index
39
Trellis Coded Modulation
selection 1-43
Signal to Noise Ratio Informa-
tion 1-39
SIT files 1-31
U
Speed Conversion 1-81
speed conversion 1-35
Standard AT command set
responses 1-54
"Standard AT" Result
Codes 1-56
UART 1-23
UARTs 1-22, 1-23, 1-29, 1-
31, 1-32
16450 1-22, 1-23, 1-29
16550 1-22, 1-29
8250 1-22, 1-23, 1-29
8250A 1-22, 1-23, 1-29
Identifying 1-23
T
Tech Support 1-68
Technical Specifications 1-81
Telephone Line 1-11
Terminal Emulation 1-30
Terminal emulation 1-30
Terminal Emulation Setup 1-30
Upgrading the MT2834BA 1-
69
Upgrading the MT2834BL 1-69
Upgrading the MT2834PCS 1-
69
UUCP spoofing 1-42
TERSE
55
VERBOSE 1-
V
Time Elapse for Escape Se-
quence 1-53
S32 1-53
Time for Carrier
S7 1-51
V.25bis Commands 1-48
V.34 Line Probe 1-36
V.42 1-32
V.42bis 1-22, 1-23, 1-29, 1-
31, 1-32
Time for Carrier (Abort
Timer) 1-51
W
Tone Dialing: Tone Spacing and
Duration 1-52
S11 1-52
Transmission speed 1-23, 1-
29
transmit buffer size 1-35
Transmit Data 1-19
Transmit Level 1-83
wait for ringback 1-45
Wait Time for Dial Tone 1-51
S6 1-51
Warranty 1-67
Weight 1-84
X
XON/XOFF 1-28
Xon/Xoff flow control 1-37
89
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