3Com Switch Hub 1000 SX User Manual

®
SuperStack II Hub 1000 SX  
User Guide  
®
A member of the 3Com SuperStack II System  
Part No. 09-1354-000  
Published March 1998  
 
Connecting a Power Workgroup 3-2  
Mixing Connections 3-4  
Connecting Through the Uplink 3-5  
Troubleshooting 3-6  
Updating the Firmware Image A-15  
Checking the Firmware Version A-15  
Transferring the Firmware Image File A-16  
Logging Off A-17  
Troubleshooting A-17  
iv  
 
3ComFacts Automated Fax Service C-2  
3ComForum on CompuServe Online Service C-3  
Support from 3Com C-4  
Returning Products for Repair C-5  
GLOSSARY  
INDEX  
FCC CLASS A VERIFICATION STATEMENT  
v
 
 
FIGURES  
2-1 Hub 1000 SX Front and Rear Panels 2-2  
3-2 Power Workgroup Connection 3-3  
3-3 Aggregated Switches Connection 3-4  
3-4 Mixed Connection 3-5  
3-5 Connection to Another Hub 1000 SX 3-5  
3-6 Uplink Connection to a 10/100 Mbps Switch 3-6  
A-1 Console Port A-1  
vii  
 
 
2-3 GBIC Modules 2-7  
3-1 Gigabit Ethernet Maximum Cable Lengths 3-1  
3-2 Troubleshooting Tips 3-6  
A-1 Situations That Require Configuring Port Settings A-5  
A-2 Port Configuration Menu A-7  
A-3 Hub Status Information A-12  
A-4 File Transfer Error Messages  
A-18  
A-5 Fatal Error Messages  
A-18  
ix  
 
 
ABOUT THIS GUIDE  
This guide contains installation procedures and technical information  
about the 3Com® SuperStack® II Hub 1000 SX Gigabit Ethernet  
full-duplex repeater (part number 3C510-SX).  
It is assumed that the user knows basic precautions and procedures for  
working with electrical equipment and has experience installing, using,  
and managing an Ethernet network. It is also assumed that the user has  
If release notes are shipped with this product and the information in  
the release notes differs from the information in this guide, follow  
the information in the release notes.  
Table 1 and Table 2 list conventions that are used throughout this guide.  
Table 1 Notice Icons  
Icon  
Notice Type  
Description  
Information note  
Important features or instructions  
Caution  
Warning  
Information to alert you to potential damage to a  
program, system, or device  
Information to alert you to potential personal injury  
 
     
2
ABOUT THIS GUIDE  
Table 2 Text Conventions  
Convention  
Description  
Screen displays  
This typeface represents information as it appears on  
the screen.  
Commands  
The word “command” means you must enter the  
command exactly as shown in text and press Return  
or Enter. For example:  
To remove the IP address, enter the following  
command:  
SETDEFAULT !0 -IP NETaddr = 0.0.0.0  
This guide always gives the full form of a command in  
uppercase and lowercase letters. However, you can  
abbreviate commands by entering only the uppercase  
letters and the appropriate value. Commands are not  
case sensitive.  
The words “enter”  
and “type”  
When you see the word “enter” in this guide, you must  
type something, and then press the Return or Enter key.  
Do not press the Return or Enter key when an instruction  
simply says “type.”  
Keyboard key names  
If you must press two or more keys simultaneously, the key  
names are linked with a plus sign (+). For example:  
Press Ctrl+Alt+Del.  
Menu commands  
and buttons  
Menu commands or button names appear in italics.  
Example:  
From the Help menu, select Contents.  
Words in italicized type Italics emphasize a point or denote new terms at the place  
where they are defined in the text.  
Words in bold-face  
Bold text denotes key features.  
type  
 
   
INTRODUCTION  
1
Gigabit Ethernet technology allows signal transmission at the rate of one  
gigabit per second (1 Gbps, or 1000 Mbps), while continuing to support  
IEEE 802.3 CSMA/CD local area networks. Using this technology, you can  
add gigabit bandwidth to critical areas of a network and fully leverage  
investments in Ethernet and Fast Ethernet products.  
Hub 1000 SX  
The 3Com® SuperStack® II Hub 1000 SX Gigabit Ethernet full-duplex  
General Description repeater (part number 3C510-SX) combines the low cost and simplicity  
of a hub with the high performance and efficient throughput of a switch.  
You can use the Hub 1000 SX to:  
Aggregate servers  
Aggregate 10/100 Mbps switches  
Provide gigabit bandwidth to a power workgroup that is running a  
high-bandwidth application such as medical imaging, video editing,  
film postproduction, CAD/CAM, or digital prepress  
The Hub 1000 SX is an eight-port repeater. All ports transmit and receive  
at a speed of one gigabit per second. The hub forwards all incoming  
packets (without filtering them) to all links except the originating  
link, thus providing a shared bandwidth domain. Like a switch, the  
Hub 1000 SX uses full-duplex ports and packet flow control to increase  
bandwidth and ensure reliable performance.  
The hub is ready to use and requires no configuration. However, some  
configuration options are available through the console interface for use  
in exceptional cases.  
The Hub 1000 SX is part of the 3Com SuperStack II system and can  
be used with the SuperStack II Advanced Redundant Power System  
(Advanced RPS) and the SuperStack II Uninterruptible Power System (UPS),  
which provide fail-safe operation and a constant power supply.  
 
                   
1-2  
CHAPTER 1: INTRODUCTION  
Downlinks  
and Uplink  
The hubs eight 1000BASE-SX full-duplex downlink ports (downlinks) can  
connect to servers or clients that are equipped with Gigabit Ethernet  
network interface cards (NICs) or to 10/100 Mbps switches that are  
equipped with Gigabit Ethernet uplink devices.  
One uplink port (uplink) accepts an optional gigabit interface connector  
(GBIC) module. The following types of GBIC modules are available:  
1000BASE-CX coaxial transmits over short-haul shielded balanced  
copper cable (known as twinaxial STP).  
1000BASE-LX long-wavelength transmits over multimode fiber (MMF)  
or single-mode fiber (SMF) cable.  
1000BASE-SX short-wavelength transmits over MMF cable.  
The primary use of the uplink is to connect to a network backbone  
through a Gigabit Ethernet switch such as the 3Com SuperStack II  
Switch 9300.  
Full-Duplex  
Operation  
Full-duplex operation allows frames to be transmitted and received  
simultaneously and, in effect, doubles the bandwidth available on a link.  
For Gigabit Ethernet devices, full-duplex operation allows a peak data  
transmission rate of 2 Gbps. All Hub 1000 SX ports operate only in  
full-duplex mode and receive frames from attached segments at a  
speed of 1 Gbps.  
Each ports input buffer places received packets in an 18 KB input FIFO to  
wait in a queue for the hubs internal bus. The hub grants ports access to  
the bus in a round-robin fashion. When a port has access to the bus, it  
places the packet at the head of its input queue on the bus. All the other  
ports transmit the packet out. Link-level flow control manages the queue.  
Flow Control  
The Hub 1000 SX uses IEEE 802.3x flow control to prevent input buffers  
from overflowing. Flow control uses pause frames to communicate buffer  
status between linked transmitting and receiving devices (transmitters  
and receivers). A receiver sends a pause frame—thereby using outgoing  
flow control—to tell a transmitter to stop the transmission of data frames  
for a specified period, allowing the receivers input port buffers to empty.  
When a transmitter receives pause frames—using incoming flow  
control—it suspends transmission for the specified period.  
 
                               
Flow Control 1-3  
When the receivers input buffers can store packets again, it can either  
send another pause frame to tell the transmitter to resume transmission,  
or wait for transmission to resume.  
If the Hub 100 SX receives a pause frame, it does not remove the frame  
from the network. Instead, it corrupts the frame’s CRC field and  
retransmits the frame to all other ports.  
Asymmetric With asymmetric flow control, only one of two linked devices can use  
Flow Control incoming flow control to receive pause frames. Most full-duplex repeaters  
default to asymmetric flow control. The Hub 1000 SX downlinks support  
asymmetric, outgoing flow control only. The downlinks can send pause  
frames to tell attached devices to stop transmission. They ignore any  
pause frames that they receive, because acting upon them would stop  
transmission to all ports, bringing hub operation to a halt.  
Symmetric With symmetric flow control, both linked devices can use incoming  
Flow Control and outgoing flow control to send and receive pause frames. The  
Hub 1000 SX uplink defaults to symmetric flow control—also known  
as bidirectional flow control—which prevents congestion at the core of  
the network when the hub is connected to the network backbone.  
The uplink can be reconfigured for asymmetric, outgoing flow control to  
support a connection to a server or 10/100 Mbps switch.  
Auto-Negotiation Related to flow control is the auto-negotiation capability, in which the  
Hub 1000 SX ports and linked devices advertise their flow control  
capabilities and automatically select the best common mode of  
communication. During an auto-negotiation sequence, the Hub 1000 SX  
downlinks advertise their capability for outgoing flow control and the  
uplink advertises its capability for incoming and outgoing flow control.  
For example, the result of an auto-negotiation sequence between a  
Hub 1000 SX downlink and a SuperStack II Switch 3000 port is that the  
downlink uses outgoing flow control and the switch port uses incoming  
flow control.  
Forced Link The Hub 1000 SX ports default to auto-negotiation. Rare cases (for  
example, linking to a device that does not support auto-negotiation) may  
require that auto-negotiation be disabled on a port, thereby enabling  
forced link on that port. When forced link is enabled, linked devices must  
have matching flow control capabilities. For example, a port that is set for  
forced link and outgoing flow control can connect successfully only with  
a port that is set for forced link and incoming flow control.  
 
                     
1-4  
CHAPTER 1: INTRODUCTION  
Features and  
Functions  
The hub can be mounted in a 19-inch standard rack or placed on a  
flat surface. It supports the 1000 Mbps media access control (MAC)  
as specified in the IEEE 802.3z standard. In addition, the hub has  
these features:  
LED indicators report the status of each port and of hub operations. A  
meter shows the percentage of bandwidth being used within the hub.  
The serial console interface allows limited options for port  
configuration and, if necessary, rmware updates.  
Power-on self-test (POST) diagnostics determine whether the hub is  
functioning properly at power up.  
Frame-aging firmware improves performance by minimizing  
unnecessary frame aging and subsequent attempts to retransmit  
packets at the protocol level.  
Round-robin arbitration grants fair access for all ports to the hubs  
internal bus on a packet-by-packet basis.  
Signal retiming restores the timing and amplitude of the received  
signal before retransmitting the signal.  
A carrier integrity monitor checks packets for invalid framing and  
removes invalid frames from the network.  
Jabber control inhibits overly long transmissions of data generated by  
the hardware failure of an attached device.  
 
                   
INSTALLING THE HUB  
2
This chapter describes the Hub 1000 SX package contents and provides  
installation procedures for the hub and for optional GBIC modules and  
power systems.  
No configuration is required to install and use the hub.  
Safety Precautions  
To avoid personal injury or damage to the Hub 1000 SX unit, observe the  
following safety precautions:  
WARNING: Do not perform any maintenance on the hub while it is still  
connected to a power source.  
WARNING: Remove all jewelry from your hands and wrists before  
installing the hub. Use insulated or nonconductive tools.  
CAUTION: Power for the unit must be supplied by a grounded power  
source. The hub should never be connected to an ungrounded AC outlet  
or power supply.  
Package Contents  
Remove the hub from the shipping package and verify that you have  
received these items in good condition:  
Hub 1000 SX unit  
Rack mounting kit containing two brackets and four screws  
Four rubber feet for desktop placement  
AC power cord  
SuperStack II Hub 1000 SX User Guide  
Inspect each item for damage. If you find a problem, contact the network  
supplier and the carrier that delivered the package.  
 
             
2-2  
CHAPTER 2: INSTALLING THE HUB  
If you need to return the hub to 3Com, pack it in the original (or  
If you ordered a GBIC module or optional power system, it is packaged  
separately from the hub.  
Hub Description  
The hubs front and rear panels are shown in Figure 2-1.  
Front panel  
100  
50  
SUPER  
STACK  
PORT STATUS  
®
1000BASE-SX  
UNIT  
STATUS  
ACTIVITY  
LINK  
OVERTEMP  
PWR  
RPS ON  
1
2
3
4
5
6
7
8
TX  
RX  
TX  
RX  
TX  
RX  
TX  
RX  
TX  
RX  
TX  
RX  
TX  
RX  
TX  
RX  
RPS FAIL  
PAUSE  
1
2
3
4
5
6
7
8
9
10  
%
SuperStack II  
HUB 1000 SX  
BW USAGE  
3C510-SX  
1000BASE-SX downlink ports  
% BW  
usage meter  
Hub operation  
LEDs  
PORT STATUS  
LEDs  
Rear panel  
REFER TO  
AC  
IN  
3Com Corporation  
INSTRUCTION MANUAL  
Santa Clara, CA  
FOR CORRECT  
SELECTION OF  
POWER CORD  
®
!
Made in USA  
DC POWER  
CONSOLE  
GBIC  
CAUTION: For continued protection  
against risk of fire use only with same  
type and rating of of anti-surge fuse.  
RESET  
INPUT  
V
SUPPLY DATA  
5
+12 -12  
FUSE  
2.0  
V~  
H
z
A
1.0  
A
100-240 50/60  
A
max 8.5 2.5 1.0  
AC input  
DC power  
Console  
Reset  
GBIC port  
Figure 2-1 Hub 1000 SX Front and Rear Panels  
downlink ports accept SC connectors and support 50/125 µ or  
62.5/125 µ fiber-optic cable. The ports can connect to servers that  
are equipped with Gigabit Ethernet NICs or to switches that are  
equipped with Gigabit Ethernet uplink devices.  
Indicators (see Table 2-2) show hub and port status when power is on.  
 
           
Preparing the Site 2-3  
Rear Panel The AC input socket accepts a 100–240 V AC power cord. Power can  
be supplied through optional 3Com SuperStack II Advanced Redundant  
System (UPS) units. These units use the DC power connector. See “Using  
Optional Power Systems” later in this chapter.  
The console port, a DB-9 standard male connector, can connect to a PC  
through a null modem cable. For information on the console functions,  
see Appendix A.  
The Reset button resets the hubs on-board CPU.  
The GBIC port accepts an optional 3Com GBIC module that lets the hub  
connect to a Gigabit Ethernet device.  
Preparing the Site  
Make sure that the installation site meets the following conditions:  
The hub is accessible and you can easily connect the cables.  
The cables are away from:  
Sources of electrical noise, such as: heating, ventilation,  
and air conditioning (HVAC); radios; transmitters; and  
broadband amplifiers  
Power lines and fluorescent lighting fixtures  
Water or moisture cannot enter the hubs case.  
Airflow around the unit and through the vents is not restricted.  
Provide a minimum of 1-inch (2.5-cm) clearance on all four sides  
of the unit.  
No objects are placed directly on top of the unit.  
Installing and  
You can mount the hub in a standard 19-inch rack or place it on a desk  
Connecting the Hub or table.  
Mounting in a Rack Two brackets and four screws allow rack mounting in a standard  
19-inch rack.  
1 Place the hub on a level surface, with the front panel facing you.  
2 Position a bracket over the mounting holes on one side of the hub,  
as shown in Figure 2-2.  
 
                       
2-4  
CHAPTER 2: INSTALLING THE HUB  
.
®
Figure 2-2 Attaching a Bracket for Rack Mounting  
3 Insert the two screws and tighten with a screwdriver. Do not overtighten  
the screws.  
4 Repeat steps 2 and 3 for the other side of the hub.  
5 Mount the hub in the rack and secure it with suitable screws, as shown in  
Figure 2-3.  
TX  
1
RX  
TX  
2
RX  
TX  
3C510-SX  
3
RX  
1000BASE-SX  
TX  
4
RX  
TX  
5
RX  
TX  
6
RX  
TX  
7
100  
50  
RX  
TX  
8
RX  
PORT ST  
ACTIVITY  
LINK  
A
TUS  
10  
%
1
2
3
4
SUPER  
STACK  
BW USAGE  
OVERTEMP  
PWR  
5
6
7
8
RPS ON  
RPS  
UNIT  
ST  
9
F
A
TUS  
AIL  
PAUSE  
®
SuperStack II  
HUB 1000 SX  
Figure 2-3 Rack Mounting the Hub  
6 Remove the protective rubber cap from each downlink port and attach  
the proper cable to make the desired network connection. Table 2-1  
provides connector and cable information for downlink connections.  
For guidelines on making typical connections, see Chapter 3.  
 
         
Interpreting Hub Indicators 2-5  
Table 2-1 Downlink Connections  
Connector  
Type  
Maximum Cable  
Length (Meters)  
Cable Type  
SC  
Short-wavelength (850 nm) fiber-optic:  
62.5/125 µ MMF  
260  
550  
50/125 µ MMF  
7 Apply power to the hub in either of these ways:  
Plug one end of the power cord into the AC input socket and the  
other end into a power source.  
Connect the hub to a power supply, as described in “Using Optional  
Power Systems” later in this chapter.  
Placing on a Desktop If you place the hub on a desk or table, attach the supplied rubber feet to  
each bottom corner of the hub. Remove the protective cap from each  
downlink port and attach the proper cable to make the desired network  
connection. (For connector and cable information, see Table 2-1. For  
to the hub in either of these ways:  
Plug one end of the power cord into the AC input socket and the  
other end into a power source.  
Connect the hub to a power supply, as described in “Using Optional  
Power Systems” later in this chapter.  
Interpreting Hub  
Indicators  
When power is applied, all the indicators on the front panel light  
momentarily. The UNIT STATUS LED is amber while POST is running.  
After approximately 30 seconds, the UNIT STATUS LED turns green.  
Verify that the PWR (power) LED remains lit, indicating that the hub  
is receiving power.  
For explanations of the hub indicators, see Table 2-2.  
 
                 
2-6  
CHAPTER 2: INSTALLING THE HUB  
Table 2-2 Hub 1000 SX Indicators  
SUPER  
STACK  
100  
50  
PORT STATUS  
UNIT  
STATUS  
ACTIVITY  
LINK  
OVERTEMP  
PWR  
RPS ON  
RPS FAIL  
PAUSE  
1
2
3
4
5
6
7
8
9
SuperStack II  
HUB 1000 SX  
10  
% BW USAGE  
Indicator  
Color  
Status  
Meaning  
% BW usage meter  
Green  
Fluctuating  
The meter indicates the percentage of bandwidth that the  
hub is using. Because the hub can be connected to multiple  
network segments, this meter represents the aggregate  
load on the hub.  
PORT STATUS LEDs  
ACTIVITY  
LEDs 1 through 8 show the status of the downlinks. LED 9  
shows the status of the uplink.  
Green  
Green  
ON  
OFF  
ON  
OFF  
The port is receiving data.  
The port is not receiving data.  
LINK  
A connection exists between the port and the end node.  
There is no connection between the port and the end node.  
Hub operation LEDs  
OVERTEMP  
Amber  
Green  
Amber  
ON  
ON  
ON  
The internal temperature exceeds 158 °F (70 °C).  
The Advanced RPS is connected and turned on.  
RPS ON  
UNIT STATUS  
The hub is performing POST diagnostics. If the amber LED  
Flashing  
ON  
An error has occurred.  
Green  
The hub is operating normally.  
A firmware update is proceeding.  
Flashing  
Amber/Green Flashing  
A firmware update error occurred. See “Troubleshooting”  
in Appendix A.  
PWR  
Green  
ON  
ON  
The hub is receiving power.  
RPS FAIL  
Amber  
The Advanced RPS is connected, but a failure  
condition exists.  
PAUSE  
Green  
ON  
The uplink port has received a pause frame. For an  
explanation of pause frames, see “Flow Control” in  
Chapter 1.  
 
                         
Installing and Connecting a GBIC Module 2-7  
Installing and  
Connecting a  
GBIC Module  
The gigabit interface connector (GBIC) port on the rear panel of the  
Hub 1000 SX chassis accepts an optional 3Com GBIC module that  
permits connection to a Gigabit Ethernet device. GBIC modules must  
be ordered separately in either single-packs or six-packs.  
By inserting the appropriate GBIC module in the hubs rear-panel uplink  
port, you can use various types of cabling to connect the hub to LAN  
devices. For example, you can use the 1000BASE-LX module to reach  
much greater distances than is possible with 1000BASE-SX connections.  
A sample GBIC module appears in Figure 2-4. Table 2-3 lists the types of  
GBIC modules available from 3Com.  
Figure 2-4 Sample GBIC Module  
Table 2-3 GBIC Modules  
3Com  
Connector  
Type  
Maximum Cable  
Length (Meters)  
Module Type Part Number  
Cable Type  
1000BASE-CX 3CGBIC4  
3CGBIC4-6PK  
HSSDC  
Shielded balanced twinaxial STP  
(coaxial jumper)  
25  
1000BASE-LX  
3CGBIC2  
SC  
Long-wavelength fiber-optic  
(1300 nm):  
3CGBIC2-6PK  
62.5/125 µ MMF  
50/125 µ MMF  
SMF  
440  
550  
3000  
1000BASE-SX  
3CGBIC1  
SC  
Short-wavelength fiber-optic  
(850 nm):  
3CGBIC1-6PK  
62.5/125 µ MMF  
50/125 µ MMF  
260  
550  
 
                 
2-8  
CHAPTER 2: INSTALLING THE HUB  
To install and connect a GBIC module, follow these steps:  
1 Disconnect all power to the Hub 1000 SX.  
Disconnect the AC power cord. If you are using an Advanced RPS unit,  
disconnect the RPS cable from the DC power connector.  
2 Remove the GBIC module from its shipping container.  
3 Slowly insert the module into the rear-panel uplink port, being careful not  
to damage any of the components or connecting pins.  
The module slides into the hub following the tracks in the slot. The  
lettering that shows the module type must be positioned on top of the  
connector openings when the module is in place.  
4 Push the module all the way in until the connector makes contact.  
5 Reattach the power cord and any power system cable to the hub.  
6 Attach the proper cable to the module to make the desired  
network connection.  
Both ends of the connection must be of the same media type (CX, LX,  
or SX).  
7 Reconnect power to the hub.  
Using Optional  
Power Systems  
You can ensure fail-safe operation and constant power to SuperStack II  
components by using the SuperStack II Advanced Redundant  
Power System (Advanced RPS) and the SuperStack II Uninterruptible  
Power System (UPS). These units and associated Power Modules and  
cabling must be purchased separately.  
Advanced RPS A single SuperStack II Advanced RPS (part numbers 3C16070 and  
3C16071) can protect up to four SuperStack II Hub 1000 SX units from  
internal power supply failures. If a SuperStack II units internal power fails,  
the Advanced RPS is capable of supplying all the units power needs.  
The Advanced RPS chassis is rack-mountable. It is fed by two independent  
AC lines and remains operational if one of the AC lines fails. The front panel  
provides LED indicators for monitoring temperature as well as power input  
and output status.  
 
             
Using Optional Power Systems 2-9  
Power Modules  
At least one SuperStack II Advanced Redundant Power System  
Power Module Type 2 is required for each SuperStack II hub that you  
want to protect. The Hub 1000 SX requires the 100-watt, 3.3-volt version  
of the module (part number 3C16074).  
One Advanced RPS with Power Modules configured with straight cables for  
standard usage can contain a maximum of four 100-watt Power Modules  
(and four 60-watt Power Modules), or eight 60-watt Power Modules. If  
each Power Module is configured for full redundancy with a SuperStack II  
Advanced Redundant Power System Y Cable Type 2 (part number  
Power Modules, supporting as many as four Hub 1000 SX units.  
Using the cable supplied with the Power Module, you connect the  
Power Module to the DC power connector located on the rear panel  
of the Hub 1000 SX. (For the DC power connector location, see  
Figure 2-1.)  
In the event of a failure in a Power Module, an alert is automatically  
sent to the Advanced RPS management console software.  
Cabling Options  
You can supply AC power and DC power to the Hub 1000 SX  
simultaneously, so that if an AC power failure occurs, the hub  
switches to DC power supplied by the Advanced RPS unit. You can  
also supply only DC power to the hub with the Advanced RPS unit.  
Table 2-4 summarizes the Advanced RPS configuration options.  
 
         
2-10  
CHAPTER 2: INSTALLING THE HUB  
Table 2-4 Advanced RPS Configuration Options  
Option  
Connection  
Disconnect the hub’s AC power cable from The hub obtains DC power from a single  
the AC outlet. Use the straight DC cable Power Module instead of being powered  
supplied with the Power Module to connect directly from a standard AC source. If the  
Standard usage  
the Power Module directly to the hub  
through the DC power connector located  
on the hub’s rear panel. (See “Rear Panel”  
in this chapter.)  
Power Module fails, you can swap the faulty  
module for a new one. This swapping  
method requires a reset of the hub, as in  
a power cycle.  
A cold Power Module supplies power after  
Managed redundancy Connect the hub’s AC power cable to a  
standard AC outlet. Use the straight DC  
cable supplied with the Power Module to  
connect the Power Module directly to the  
hub through the DC power connector  
located on the hub’s rear panel. (See “Rear  
Panel” in this chapter.)  
If the Hub 1000 SX internal power supply  
fails, the hub’s auto-enable feature  
automatically enables the Advanced RPS  
and resets the hub, as in a power cycle.  
Full redundancy  
Disconnect the hub’s AC power cable from This configuration offers full resilience for  
the AC outlet. Use a Y DC cable (part  
number 3C16079) to connect the hub  
mission-critical installations. The hub is  
powered from both Power Modules instead  
directly to two Power Modules through the of being powered directly from a standard  
DC power connector located on the hub’s AC source. If one of the Power Modules fails,  
rear panel. (See “Rear Panel” in this chapter.) the other module takes the full load. The  
faulty module can be hot-swapped,  
returning the system to full redundancy  
without the need for a power reset.  
When switching from Advanced RPS (DC) to AC power or from AC power  
to Advanced RPS power, the Hub 1000 SX unit resets itself. For example,  
if both the RPS and AC cables are plugged in, and then either is removed,  
the unit resets itself when it changes to the other power source.  
Uninterruptible The SuperStack II Uninterruptible Power System (UPS) (part number  
Power System 3C16010, U.S. version) protects against building power outages,  
brownouts, power surges, and spikes. If primary power fails or falters  
for any reason, the UPS automatically provides power for as long as  
7 minutes for up to four SuperStack II system units with 100-volt  
50/60 Hz, 120-volt 60 Hz, or 230-volt 50/60 Hz power.  
A hub connects to a UPS unit through the hubs AC power cord.  
 
                 
Using Optional Power Systems 2-11  
You can connect a UPS unit to an Advanced RPS unit as long as you do  
not exceed the maximum wattage (325 watts) for the UPS unit. To verify  
that the UPS units maximum wattage is not exceeded, calculate the total  
power consumption of all units connected to the Advanced RPS. If the  
result is less than 325 watts, your configuration is safe; if the result is  
greater than 325 watts, then there are too many units connected to  
the Advanced RPS.  
To calculate the total power consumption of all units connected to the  
Advanced RPS:  
1 Calculate the total wattage of all the units connected to the Advanced RPS.  
For example, one Hub 1000 SX has a maximum power consumption of  
65 watts; two Hub 1000 SX units have a maximum power consumption  
of 130 watts, and so forth.  
2 Divide the total wattage of all units by 0.7, which is the efficiency rating  
(70%) of the Advanced RPS.  
If the result is less than 325 watts, your configuration is safe; if the result  
is higher, then there are too many units connected to the Advanced RPS.  
 
   
 
MAKING CONNECTIONS  
3
This chapter contains guidelines for making typical Hub 1000 SX network  
connections and for troubleshooting problems with the hub.  
When making hub connections, follow the rules for maximum cable  
lengths, which are summarized in Table 3-1. If you connect 10/100 Mbps  
devices to the network, rules for Ethernet and Fast Ethernet connections  
also apply.  
Table 3-1 Gigabit Ethernet Maximum Cable Lengths  
Cable Type  
50/125 µ  
62.5/125 µ  
Multimode  
Fiber  
Shielded  
Single-Mode Balanced Pair  
Laser  
Connector Multimode  
Signal Type  
1000BASE-SX Short  
(850 nm)  
1000BASE-LX* Long  
(1300 nm)  
1000BASE-CX N/A  
Wavelength Type  
Fiber  
Fiber  
(Coaxial Jumper)  
SC  
550 meters  
260 meters  
440 meters  
N/A  
N/A  
N/A  
SC  
550 meters  
3 kilometers  
N/A  
HSSDC  
N/A  
N/A  
25 meters  
* The 1000BASE-LX GBIC module requires an external patch cord for connection to MMF cable.  
CAUTION: Connecting the downlink of one Hub 1000 SX to the uplink  
of a second Hub 1000 SX degrades the performance of the second hub.  
CAUTION: Connecting a Gigabit Ethernet switch downlink to a  
Hub 1000 SX downlink degrades the performance on the link to  
the switch.  
 
             
3-2  
CHAPTER 3: MAKING CONNECTIONS  
Aggregating  
Servers  
You can use the Hub 1000 SX downlinks to aggregate servers into server  
farms. First, install 3Com 3C985-SX Gigabit EtherLink® Server NICs in  
each server. Then, connect up to eight servers through the downlinks.  
The hubs optional gigabit interface connector (GBIC) uplink can connect  
to a 3Com SuperStack II Switch 9300 Gigabit Ethernet switch, thereby  
connecting to the network backbone. See Figure 3-1.  
SuperStack II  
Switch 9300  
SUPER  
®
STACK  
Single-mode fiber-optic cable  
Maximum distance: 3 km  
SuperStack II  
Hub 1000 SX  
SuperStack II  
9300 SX  
SUPER  
STACK  
®
SuperStack II  
1000 SX  
62.5/125 µ fiber-optic cable  
Maximum distance: 260 m  
Servers with 3C985-SX  
Gigabit EtherLink Server NICs  
Figure 3-1 Server Farm Connection  
Connecting a  
Power Workgroup  
A power workgroup consists of a small number of servers, or a small  
number of sophisticated users on high-end workstations. Such a  
move and process massive amounts of data in real time (for example,  
medical imaging, video editing, film postproduction, CAD/CAM, or  
digital prepress).  
You can provide gigabit bandwidth to a power workgroup as shown in  
Figure 3-2.  
 
                 
Aggregating Switches 3-3  
SuperStack II  
Switch 9300  
SUPER  
STACK  
®
Single-mode fiber-optic cable  
Maximum distance: 3 km  
SuperStack II  
Hub 1000 SX  
SuperStack II  
9300 SX  
SUPER  
STACK  
®
SuperStack II  
1000 SX  
62.5/125 µ fiber-optic cable  
Maximum distance: 260 m  
Servers with 3C985-SX  
Gigabit EtherLink Server NICs  
High-end  
workstations  
Figure 3-2 Power Workgroup Connection  
Aggregating  
Switches  
You can use the Hub 1000 SX downlinks to aggregate 10/100 Mbps  
switches such as the 3Com SuperStack II Switch 1000, Switch 3000,  
or Switch 3900. The Switch 1000 and Switch 3000 units must be  
equipped with Gigabit Ethernet uplink devices (SuperStack II Switch  
Gigabit Ethernet SX Module, part number 3C16925). The Switch 3900  
has one built-in Gigabit Ethernet port, which can be used to connect with  
the Hub 1000 SX.  
First, install 3C16925 uplink devices in the SuperStack II Switch 1000  
or SuperStack II Switch 3000 switches. Then connect up to eight  
switches to the Hub 1000 SX through the eight downlinks. The hubs  
optional GBIC uplink can connect to a 3Com SuperStack II Switch 9300  
Gigabit Ethernet switch, thereby connecting to the network backbone.  
See Figure 3-3.  
The Hub 1000 SX does not support bandwidth aggregation (trunking).  
 
                     
3-4  
CHAPTER 3: MAKING CONNECTIONS  
SuperStack II  
Switch 9300  
SUPER  
®
STACK  
Single-mode fiber-optic cable  
Maximum distance: 3 km  
SuperStack II  
Hub 1000 SX  
SuperStack II  
9300 SX  
SUPER  
STACK  
®
SuperStack II  
1000 SX  
62.5/125 µ fiber-optic cable  
Maximum distance: 260 m  
SuperStack II  
Switch 1000  
with 3C16925  
uplink device  
SuperStack II  
Switch 3000  
with 3C16925  
uplink device  
SUPER  
STACK  
SUPER  
STACK  
®
SUPER  
STACK  
®
®
SuperStack II  
3900  
SuperStack II  
1000 SX  
SuperStack II  
1000 SX  
SuperStack II  
Switch 3900  
10/100 Mbps  
UTP links  
Maximum distance: 100 m  
Multiple 10/100 Mbps  
clients  
Multiple 10 Mbps  
clients  
Figure 3-3 Aggregated Switches Connection  
Mixing Connections You can vary connections according to your requirements. For example,  
you can connect a number of servers and 10/100 Mbps switches through  
the downlinks, and connect to the network backbone through the  
uplink, as shown in Figure 3-4.  
 
     
Connecting Through the Uplink 3-5  
SuperStack II  
Switch 9300  
SUPER  
STACK  
®
Single-mode fiber-optic cable  
Maximum distance: 3 km  
SuperStack II  
Hub 1000 SX  
SuperStack II  
9300 SX  
SUPER  
®
STACK  
SuperStack II  
1000 SX  
Servers with  
3C985-SX Gigabit  
EtherLink Server NICs  
62.5/125 µ fiber-optic cable  
Maximum distance: 260 m  
SuperStack II  
Switch 1000  
with 3C16925  
uplink device  
SuperStack II  
Switch 3000  
with 3C16925  
uplink device  
SUPER  
STACK  
SUPER  
STACK  
®
SUPER  
STACK  
®
®
SuperStack II  
3900  
SuperStack II  
1000 SX  
SuperStack II  
1000 SX  
SuperStack II  
Switch 3900  
10/100 Mbps  
UTP links  
Maximum distance: 100 m  
Multiple 10/100 Mbps  
Multiple 10 Mbps  
clients  
clients  
Figure 3-4 Mixed Connection  
Connecting  
Through the Uplink  
The best use of the hub uplink is as a backbone connection to a 3Com  
SuperStack II Switch 9300 Gigabit Ethernet switch, as shown earlier in  
Figure 3-1 through Figure 3-2. Although two Hub 1000 SX units can be  
connected to each other through their uplinks, as shown in Figure 3-5,  
such a connection excludes connection to the network backbone.  
Single-mode fiber-optic cable  
Maximum distance: 3 km  
SUPER  
STACK  
SUPER  
STACK  
®
®
SuperStack II  
1000 SX  
SuperStack II  
1000 SX  
SuperStack II  
Hub 1000 SX  
SuperStack II  
Hub 1000 SX  
Figure 3-5 Connection to Another Hub 1000 SX  
 
             
3-6  
CHAPTER 3: MAKING CONNECTIONS  
The Hub 1000 SX itself can be used as the network backbone by  
connecting the uplink to a server equipped with a 3C985-SX Gigabit  
EtherLink Server NIC or to a 10/100 Mbps switch equipped with a  
3C16925 uplink device (see Figure 3-6). For these backbone connections,  
reconfigure the uplink for asymmetric flow control, as described in  
“Configuring Port Settings” in Appendix A.  
Single-mode fiber-optic cable  
Maximum distance: 3 km  
SUPER  
STACK  
®
100BASE-TX  
SUPER  
STACK  
®
SuperStack II  
1000 SX  
SuperStack II  
3000 FX  
10/100 Mbps switch  
with 3C16925 uplink device  
SuperStack II  
Hub 1000 SX  
Figure 3-6 Uplink Connection to a 10/100 Mbps Switch  
Troubleshooting  
Table 3-2 summarizes some common problems and their solutions.  
Table 3-2 Troubleshooting Tips  
Symptom  
Explanation  
There is no link connection.  
Solution  
LINK LED does not light on  
a port.  
You may be attempting to connect to equipment  
that does not comply with Gigabit Ethernet  
standards or does not support auto-negotiation.  
Or, the link may be physically damaged (for example,  
the cable may be damaged).  
Disable auto-negotiation on the port (see Appendix A).  
Configure the other end of the link for forced  
configuration (see the configuration guidelines for  
the device on the other end of the link). A restored  
connection rules out physical damage.  
ACTIVITY LED does not light  
on a port.  
The port is not receiving data. Make sure that the link is connected at both ends.  
OVERTEMP LED is lit.  
The unit has overheated.  
The fan may have failed.  
Return the unit to the supplier.  
Amber UNIT STATUS LED stays POST software may  
Use the command line interface (CLI) to confirm the  
POST error. (See Appendix A.) If POST reports errors,  
return the unit to the supplier.  
lit longer than 30 seconds.  
be corrupted.  
PAUSE LED remains lit.  
A flickering PAUSE LED  
Check for problems with the device attached to the  
indicates normal flow control. Hub 1000 SX uplink.  
A PAUSE LED that remains lit  
indicates that there is too  
much traffic.  
POST FAIL messages appear  
in the CLI.  
There is a fatal  
hardware error.  
Return the unit to the supplier.  
 
             
USING THE CONSOLE PORT  
A
The Hub 1000 SX is ready to use and requires no configuration. However,  
on rare occasions you may need to confirm a POST failure, change a  
ports configuration, or update the firmware image to install a bug fix or a  
standards update. The console port provides access to a simple scrolling  
command line interface (CLI). By connecting the console port to a PC, you  
can perform these tasks:  
Configure port settings  
Display hub status  
Update the firmware image  
The console port (a DB-9 standard male connector) is located on the  
Hub 1000 SX rear panel. See Figure A-1.  
REFER TO  
AC  
IN  
3Com Corporation  
Santa Clara, CA  
Made in USA  
INSTRUCTION MANUAL  
FOR CORRECT  
®
!
SELECTION OF  
POWER CORD  
DC POWER  
CONSOLE  
GBIC  
CAUTION: For continued protection  
against risk of fire use only with same  
type and rating of of anti-surge fuse.  
RESET  
INPUT  
V
SUPPLY DATA  
5
+12 -12  
FUSE  
2.0  
V~  
H
z
A
1.0  
A
100-240 50/60  
A
max 8.5 2.5 1.0  
Console  
Figure A-1 Console Port  
The console port default settings are:  
9600 baud  
8 data bits  
1 stop bit  
No parity  
Auto-baud and modem connections are not supported.  
 
               
A-2  
APPENDIX A: USING THE CONSOLE PORT  
Requirements  
To use the console port and CLI, you need:  
A PC with a serial port  
A null modem cable  
A terminal-emulation program  
If you need to perform a firmware update, the terminal-emulation  
program must support one of these file transfer protocols: Xmodem,  
Xmodem-1K, or Xmodem-CRC.  
Connecting the  
Console Port  
It is not necessary to disconnect the hub from the power source to  
connect the console port. However, if you do disconnect the power,  
With Power To connect the console port while the hub is connected  
Connected to power:  
1 Connect a null modem cable between the PC serial port and the console  
port on the hubs rear panel. (See Figure A-1.)  
2 Turn on the PC.  
3 Start the terminal-emulation program.  
4 Configure the program with the same settings as the Hub 1000 SX  
console interface port:  
9600 baud  
8 data bits  
1 stop bit  
No parity  
5 Press Enter.  
The PC screen displays the CLI header and the password prompt:  
****************************************************  
*
*
*
*
*
*
*
*
*
*
SuperStack II (tm)  
Hub 1000 SX  
Copyright (c)1997 3Com Corporation  
****************************************************  
Enter password ->  
 
             
Connecting the Console Port A-3  
With Power To connect the console port when the hub is disconnected  
Disconnected from power:  
1 Connect a null modem cable between the PC serial port and the  
console port on the Hub 1000 SX rear panel.  
2 Turn on the PC.  
3 Start the terminal-emulation program.  
4 Configure the program with the same settings as the Hub 1000 SX  
console interface port:  
9600 baud  
8 data bits  
1 stop bit  
No parity  
5 Reconnect the hub to the power supply.  
The PC screen displays POST messages, followed by the CLI header and  
the password prompt.  
POST Messages When you connect the hub to power or when you press the Reset button  
on the hubs rear panel, the PC screen displays messages while POST is  
proceeding. When POST is finished, the CLI header appears, followed by  
the password prompt. For example:  
POST Level 0: PASS  
Checking FDS ... valid.  
Performing Level 1 Tests ...  
Test: Port 0 - Pass.  
Test: Port 1 - Pass.  
Test: Port 2 - Pass.  
Test: Port 3 - Pass.  
Test: Port 4 - Pass.  
Test: Port 5 - Pass.  
Test: Port 6 - Pass.  
Test: Port 7 - Pass.  
Test: Port 8 - Pass.  
Test: Port aliasing - Pass.  
Test: MAC Address - Valid: 08004E2BA4D9  
Test: Fan sense - Pass.  
POST Level 1: PASS  
 
       
A-4  
APPENDIX A: USING THE CONSOLE PORT  
Hardware Version 0  
Bootcode Version 1.00, 02/05/98  
Firmware Version 1.00, 02/05/98  
****************************************************  
*
*
*
*
*
*
*
*
*
*
SuperStack II (tm)  
Hub 1000 SX  
Copyright (c)1997 3Com Corporation  
****************************************************  
Enter password ->  
Any POST FAIL message indicates a fatal hardware error. If you see a FAIL  
message, return the hub to the supplier.  
Logging On  
The default password that is set at the factory is admin. If this is the first  
time that anyone has logged on to the hub, enter the default password at  
the prompt:  
admin  
Asterisks (*) instead of plain text appear at the prompt while you are  
typing the password.  
The Hub 1000 SX Configuration menu appears.  
***************************************************  
**  
Hub 1000 Configuration Menu  
**  
***************************************************  
[1] Configure port settings  
[2] Display hub status  
[3] Update firmware image  
[4] Change password  
[5] Logout  
Enter choice ->  
To select an option from the Configuration menu, enter the option  
number at the prompt.  
After 4 minutes of inactivity, the CLI logs off automatically.  
 
   
Changing the Password A-5  
Changing the  
Password  
You can change the password if you need to. The new password must be  
eight characters or fewer and cannot contain spaces or tabs.  
To change the password, enter:  
4
You are prompted to enter the old password and then the new password,  
as shown in this example:  
***************************************************  
**  
Hub 1000 Configuration Menu  
**  
***************************************************  
[1] Configure port settings  
[2] Display hub status  
[3] Update firmware image  
[4] Change password  
[5] Logout  
Enter choice -> 4  
Old password: *****  
New password: *******  
Re-enter new password: *******  
The following sections show examples of how to use the Hub 1000 SX  
Configuration menu.  
Configuring  
Port Settings  
Table A-1 summarizes the situations that require you to configure port  
settings through the Port Configuration menu.  
Table A-1 Situations That Require Configuring Port Settings  
Situation  
Action  
You do not want a port to be connected.  
A port cannot connect with a linked device.  
Disable the port.  
Disable auto-negotiation. (Force  
the link.)  
A linked device does not support  
auto-negotiation.  
Disable auto-negotiation. (Force  
the link.)  
You are connecting to a server or a  
10/100 Mbps switch through the uplink.  
Configure the uplink for  
asymmetric flow control.  
 
         
A-6  
APPENDIX A: USING THE CONSOLE PORT  
To display the Port Configuration menu:  
1 At the Configuration menu prompt, enter:  
1
2 At the next prompt, enter the numbers of the ports that you want  
to configure.  
You can specify a single port number, multiple port numbers separated by  
commas or spaces (for example: 5, 6 7), or a range of port numbers  
separated with a hyphen (for example: 5-7).  
The following example specifies ports 3, 5, 6, and 7:  
***************************************************  
**  
Hub 1000 Configuration Menu  
**  
***************************************************  
[1] Configure port settings  
[2] Display hub status  
[3] Update firmware image  
[4] Change password  
[5] Logout  
Enter choice -> 1  
Enter port number(s), from 1 to 9: 3 5-7  
The Port Configuration menu appears, and the specified ports are  
displayed. For example:  
****  
Port Configuration Menu  
****  
(1) Enable port  
(2) Disable port  
(3) Enable Auto-Negotiation  
(4) Disable Auto-Negotiation (Force link)  
(5) Show port settings  
(6) Use factory default settings  
(7) Save new port settings  
(9) Apply changes and exit  
Selected ports: 3, 5, 6, 7  
Enter choice ->  
Table A-2 summarizes the Port Configuration menu options.  
 
 
Configuring Port Settings A-7  
Table A-2 Port Configuration Menu  
Option  
Description  
(1) Enable port  
Enable the port for linking. The factory  
default is all ports enabled.  
(2) Disable port  
Disable the port for linking.  
(3) Enable auto-negotiation  
Enable auto-negotiation. The factory  
default is auto-negotiation enabled on  
all ports.  
(4) Disable auto-negotiation (force link) Disable auto-negotiation.  
(5) Show port settings  
List the current settings for all ports.  
(6) Use factory default settings  
Return selected ports to factory  
default settings.  
(7) Save new port settings  
Save the settings. Select this option if you  
want settings to persist after a hub reset.  
(8) Exit without change to settings  
(9) Apply changes and exit  
Exit to the Hub 1000 SX Configuration  
menu without applying or saving settings.  
Apply the settings and exit to the  
Hub 1000 SX Configuration menu.  
If you want settings to persist after a hub  
reset, you must select option 7 before  
selecting option 9.  
Disabling Ports The following example shows how to disable ports 3, 5, 6, and 7 and  
apply the changes.  
***************************************************  
**  
Hub 1000 Configuration Menu  
**  
***************************************************  
[1] Configure port settings  
[2] Display hub status  
[3] Update firmware image  
[4] Change password  
[5] Logout  
Enter choice -> 1  
Enter port number(s), from 1 to 9: 3 5-7  
****  
Port Configuration Menu  
****  
(1) Enable port  
(2) Disable port  
(3) Enable Auto-Negotiation  
(4) Disable Auto-Negotiation (Force link)  
 
       
A-8  
APPENDIX A: USING THE CONSOLE PORT  
(5) Show port settings  
(6) Use factory default settings  
(7) Save new port settings  
(8) Exit without change to settings  
(9) Apply changes and exit  
Selected ports: 3, 5, 6, 7  
Enter choice -> 2  
****  
Port Configuration Menu  
****  
(1) Enable port  
(2) Disable port  
(3) Enable Auto-Negotiation  
(4) Disable Auto-Negotiation (Force link)  
(5) Show port settings  
(6) Use factory default settings  
(7) Save new port settings  
(8) Exit without change to settings  
(9) Apply changes and exit  
Selected ports: 3, 5, 6, 7  
Enter choice -> 9  
Changes applied  
Any time you select option 9 without selecting option 7, the settings will  
return to the previous values in the event of a hub reset. This allows you  
to experiment with port settings without specifying that they persist after  
a hub reset. If you want settings to persist, select option 7 before  
selecting option 9.  
Disabling Disabling the auto-negotiation capability enables forced link on a port.  
Auto-Negotiation When forced link is enabled, linked devices must have matching flow  
control capabilities. For example, a port that is set for forced link and  
outgoing flow control can connect successfully only with a port that is  
set for forced link and incoming flow control.  
When you disable auto-negotiation on a Hub 1000 SX port, you also  
need to set forced link on the connected device. On some devices, this  
setting is called forced configuration or link negotiation. For details on  
the correct configuration, see the configuration guidelines for the linked  
device.  
The following example shows how to disable auto-negotiation on port 1,  
save the new port setting, and apply it.  
 
   
Configuring Port Settings A-9  
***************************************************  
** Hub 1000 Configuration Menu **  
***************************************************  
[1] Configure port settings  
[2] Display hub status  
[3] Update firmware image  
[4] Change password  
[5] Logout  
Enter choice -> 1  
Enter port number(s), from 1 to 9: 1  
****  
Port Configuration Menu  
****  
(1) Enable port  
(2) Disable port  
(3) Enable Auto-Negotiation  
(4) Disable Auto-Negotiation (Force link)  
(5) Show port settings  
(6) Use factory default settings  
(7) Save new port settings  
(8) Exit without change to settings  
(9) Apply changes and exit  
Selected ports: 1  
Enter choice -> 4  
Enable Outgoing Flowcontrol (Y/N)? y  
Port 1 is a downlink. Because downlinks support outgoing flow control only,  
you can enable or disable outgoing flow control, but you cannot configure  
incoming flow control. You might choose to disable outgoing flow control  
if the port is linking to a device that does not support flow control.  
****  
Port Configuration Menu  
****  
(1) Enable port  
(2) Disable port  
(3) Enable Auto-Negotiation  
(4) Disable Auto-Negotiation (Force link)  
(5) Show port settings  
(6) Use factory default settings  
(7) Save new port settings  
(8) Exit without change to settings  
(9) Apply changes and exit  
Selected ports: 1  
Enter choice -> 7  
Settings saved  
 
A-10  
APPENDIX A: USING THE CONSOLE PORT  
Because option 7 has been selected, the settings will persist after a  
hub reset.  
****  
Port Configuration Menu  
****  
(1) Enable port  
(2) Disable port  
(3) Enable Auto-Negotiation  
(4) Disable Auto-Negotiation (Force link)  
(5) Show port settings  
(6) Use factory default settings  
(7) Save new port settings  
(8) Exit without change to settings  
(9) Apply changes and exit  
Selected ports: 1  
Enter choice -> 9  
Changes applied  
Configuring The uplink (port 9) defaults to symmetric (both outgoing and incoming)  
the Uplink for flow control. You must configure the uplink for asymmetric flow control  
Asymmetric to connect it to a server or 10/100 Mbps switch. The server or switch  
Flow Control must have the appropriate NIC or uplink device, support flow control,  
and be configured to receive pause frames.  
The following example shows how to configure the uplink for asymmetric  
flow control by disabling auto-negotiation, enabling outgoing flow  
control, and disabling incoming flow control. With this configuration,  
the uplink is set to forced link and can send pause frames but ignores  
pause frames that it receives. (For more details on flow control, see “Flow  
Control” in Chapter 1.)  
***************************************************  
**  
Hub 1000 Configuration Menu  
**  
***************************************************  
[1] Configure port settings  
[2] Display hub status  
[3] Update firmware image  
[4] Change password  
[5] Logout  
Enter choice -> 1  
Enter port number(s), from 1 to 9: 9  
 
   
Configuring Port Settings A-11  
****  
Port Configuration Menu  
****  
(1) Enable port  
(2) Disable port  
(3) Enable Auto-Negotiation  
(4) Disable Auto-Negotiation (Force link)  
(5) Show port settings  
(6) Use factory default settings  
(7) Save new port settings  
(8) Exit without change to settings  
(9) Apply changes and exit  
Selected ports: 9  
Enter choice -> 4  
Enable Outgoing Flowcontrol (Y/N)? y  
Enable Incoming Flowcontrol (Y/N)? n  
****  
Port Configuration Menu  
****  
(1) Enable port  
(2) Disable port  
(3) Enable Auto-Negotiation  
(4) Disable Auto-Negotiation (Force link)  
(5) Show port settings  
(6) Use factory default settings  
(7) Save new port settings  
(8) Exit without change to settings  
(9) Apply changes and exit  
Selected ports: 9  
Enter choice -> 7  
Settings saved  
Because option 7 has been selected, the settings will persist after a hub reset.  
****  
Port Configuration Menu  
****  
(1) Enable port  
(2) Disable port  
(3) Enable Auto-Negotiation  
(4) Disable Auto-Negotiation (Force link)  
(5) Show port settings  
(6) Use factory default settings  
(7) Save new port settings  
(8) Exit without change to settings  
(9) Apply changes and exit  
Selected ports: 9  
Enter choice -> 9  
Changes applied  
 
A-12  
APPENDIX A: USING THE CONSOLE PORT  
Displaying  
Hub Status  
Hub status includes a matrix of information about the hub ports. In this  
matrix, Y indicates yes and n indicates no. (See Table A-3.)  
Table A-3 Hub Status Information  
Category  
State Description  
Port is enabled  
Y
n
Y
n
The port is enabled for linking.  
The port is disabled for linking.  
Link state is up  
A link exists between the port and a device.  
No link exists between the port and  
a device.  
Auto-negotiate link  
configuration  
Y
The port is set for auto-negotiation.  
n
Y
The port is set for forced link.  
Advertise outgoing  
flow control  
The port signals outgoing flow  
control capability.  
n
Y
n
The port does not signal outgoing flow  
control capability.  
Advertise incoming  
flow control  
The port signals incoming flow  
control capability.  
The port does not signal incoming flow  
control capability.  
The port does not support incoming  
flow control.  
Enable outgoing flow control Y or n If auto-negotiation is enabled, the result of  
the negotiation between the port and the  
linked device is shown. If auto-negotiation  
is disabled, the flow control you specify  
is shown.  
Enable incoming flow control Y or n If auto-negotiation is enabled, the result of  
the negotiation between the port and the  
linked device is shown. If auto-negotiation  
is disabled, the flow control you specify  
is shown.  
The port does not support incoming  
flow control.  
 
       
Displaying Hub Status A-13  
Hub status also includes POST and fan status, bandwidth utilization,  
hardware and firmware version, and MAC address.  
The sample hub status display that follows is the result of the changes  
made in the previous section. To view the hub status, enter:  
2
When you have finished viewing the hub status, press Enter to continue  
the CLI session.  
***************************************************  
**  
Hub 1000 Configuration Menu  
**  
***************************************************  
[1] Configure port settings  
[2] Display hub status  
[3] Update firmware image  
[4] Change password  
[5] Logout  
Enter choice -> 2  
Hub Status  
Port Number:  
1 2 3 4 5 6 7 8 9  
===========  
Port is Enabled:  
Link state is up:  
= = = = = = = = =  
Y Y n Y n n n Y Y  
Y Y n Y n n n Y Y  
Auto-Negotiate link configuration: n Y Y Y Y Y Y Y n  
Advertise outgoing flow control: Y Y Y Y Y Y Y Y Y  
Advertise incoming flow control: - - - - - - - - n  
Enable outgoing flow control:  
Enable incoming flow control:  
Port has passed POST:  
Y Y Y Y Y Y Y Y Y  
- - - - - - - - n  
Y Y Y Y Y Y Y Y Y  
POST status: PASS  
Fan status: Good  
Bandwidth utilization: 0%  
Hardware Version: 0  
Firmware version: 1.00, 02/05/98  
MAC Address: 08004E2BA4D9  
Press Enter to continue ...  
 
   
A-14  
APPENDIX A: USING THE CONSOLE PORT  
Restoring the  
Factory Default  
Settings  
To restore port settings to factory defaults:  
1 At the Configuration menu prompt, enter:  
1
2 Enter the numbers of the ports to be restored to factory defaults.  
3 At the Port Configuration menu prompt, enter:  
6
4 Apply the changes.  
For example:  
***************************************************  
**  
Hub 1000 Configuration Menu  
**  
***************************************************  
[1] Configure port settings  
[2] Display hub status  
[3] Update firmware image  
[4] Change password  
[5] Logout  
Enter choice -> 1  
Enter port number(s), from 1 to 9: 1-9  
****  
Port Configuration Menu  
****  
(1) Enable port  
(2) Disable port  
(3) Enable Auto-Negotiation  
(4) Disable Auto-Negotiation (Force link)  
(5) Show port settings  
(6) Use factory default settings  
(7) Save new port settings  
(8) Exit without change to settings  
(9) Apply changes and exit  
Selected ports: 1, 2, 3, 4, 5, 6, 7, 8, 9  
Enter choice -> 6  
Ports set to factory defaults  
 
   
Updating the Firmware Image A-15  
****  
Port Configuration Menu  
****  
(1) Enable port  
(2) Disable port  
(3) Enable Auto-Negotiation  
(4) Disable Auto-Negotiation (Force link)  
(5) Show port settings  
(6) Use factory default settings  
(7) Save new port settings  
(8) Exit without change to settings  
(9) Apply changes and exit  
Selected ports: 1, 2, 3, 4, 5, 6, 7, 8, 9  
Enter choice -> 9  
Changes applied  
If you want settings to persist after a hub reset, enter option 7 before  
entering option 9.  
Updating the  
Firmware Image  
On rare occasions you may need to update the hubs rmware image to  
install a bug fix or a standards update. Firmware updates are made  
available on the 3Com World Wide Web site:  
Checking the To verify that the firmware version on the 3Com World Wide Web site  
Firmware Version is more recent than the version installed on the hub, display the hub  
status. At the Hub 1000 SX Configuration menu prompt, enter:  
2
***************************************************  
**  
Hub 1000 Configuration Menu  
**  
***************************************************  
[1] Configure port settings  
[2] Display hub status  
[3] Update firmware image  
[4] Change password  
[5] Logout  
Enter choice -> 2  
The firmware version is listed near the bottom of the Hub Status screen.  
For example:  
Firmware version: 1.00, 02/05/98  
 
     
A-16  
APPENDIX A: USING THE CONSOLE PORT  
Transferring the Make sure that the terminal-emulation program supports one of  
Firmware Image File the following file transfer protocols: Xmodem, Xmodem-1K, or  
Xmodem-CRC.  
To transfer the firmware image file:  
1 Obtain the file that contains the firmware image from the 3Com  
World Wide Web site:  
2 Copy the file to the PC.  
3 Connect the console port to the PC. (See “Connecting the Console Port”  
earlier in this appendix.)  
4 Log on. (See “Logging On” earlier in this appendix.)  
5 At the Hub 1000 SX Configuration menu prompt, enter:  
3
***************************************************  
**  
Hub 1000 Configuration Menu  
**  
***************************************************  
[1] Configure port settings  
[2] Display hub status  
[3] Update firmware image  
[4] Change password  
[5] Logout  
Enter choice -> 3  
The hub enters file transfer mode and prompts you to begin the  
file transfer.  
Please initiate XMODEM transfer now. Press <ESC> to abort.  
C
The C character indicates that the hub is waiting for the  
terminal-emulation program to send a file.  
If you want to stop the file transfer at this point, press Esc.  
6 From the terminal-emulation program, select the appropriate  
command to send a file using the Xmodem, Xmodem-1K, or  
Xmodem-CRC protocol.  
This command varies, depending on the terminal-emulation program.  
Some programs call this operation uploading a file.  
 
     
Logging Off A-17  
7 When prompted, enter the filename of the firmware image file.  
The terminal-emulation program begins to transfer the firmware image  
file. If you want to stop the file transfer, use the appropriate command in  
the terminal-emulation program.  
After the transfer is finished, the CLI displays the following message:  
File transfer successful.  
Firmware update successful.  
during a firmware update), the CLI displays the following message:  
Runtime image not valid.  
The CLI prompts you to restart the file transfer, without requiring you to  
log in again. To restart the file transfer, repeat steps 6 and 7.  
Logging Off  
To log off the CLI, at the Hub 1000 SX Configuration menu  
prompt, enter:  
5
***************************************************  
**  
Hub 1000 Configuration Menu  
**  
***************************************************  
[1] Configure port settings  
[2] Display hub status  
[3] Update firmware image  
[4] Change password  
[5] Logout  
Enter choice -> 5  
The screen returns to the CLI header and the password prompt.  
Troubleshooting  
If a firmware update error occurs, the UNIT STATUS LED flashes  
amber/green. Press the Reset button on the Hub 1000 SX rear panel and  
repeat the procedure for updating the firmware. If the UNIT STATUS LED  
continues to flash amber/green, return the unit to the supplier.  
Table A-4 summarizes error messages that may appear during a file  
transfer and actions you can take to correct the errors.  
 
       
A-18  
APPENDIX A: USING THE CONSOLE PORT  
Table A-5 lists fatal error messages. These messages indicate that the  
memory unit has failed. If you see a fatal error message, return the unit  
to the supplier.  
Table A-4 File Transfer Error Messages  
Message  
Meaning  
Action  
Xmodem error: Timed out  
sending NAK.  
The hub could not send a negative  
acknowledgment.  
For any of these errors, check the  
following items and then restart  
the transfer:  
Xmodem error: Timed out  
sending ACK.  
The hub could not send an  
acknowledgment.  
Make sure that the hub is in file  
transfer mode (you selected  
option 3 in the Hub 1000 SX  
Configuration menu).  
Xmodem error: Timed out waiting  
for packet.  
The time limit for receiving a packet  
was exceeded.  
Timed out waiting for transfer  
to start.  
The time limit for starting the file  
transfer was exceeded.  
Make sure that you are using  
the correct protocol in the  
terminal-emulation program.  
Xmodem error: Got too many  
errors to continue.  
The hub error limit was exceeded.  
Verify that you copied the correct  
file from the 3Com Web site. If  
necessary, download the file from  
the Web site again.  
Xmodem error.  
A general protocol error occurred.  
Abort key hit. Transfer aborted.  
The user pressed Esc to stop  
the transfer.  
Check that cables are connected  
properly.  
Transfer aborted by file sender.  
The Xmodem operation in the  
terminal-emulation program stopped  
the transfer.  
Eliminate any interference that  
may be coming from lighting or  
from equipment operating near  
the hub.  
File too large. Transfer aborted.  
Downloaded file not valid.  
The file being transferred is too large  
for the hub’s memory.  
The firmware image file is corrupted,  
or its format is incorrect.  
Table A-5 Fatal Error Messages  
Message  
Context  
Action  
Flash memory erase error.  
Flash memory programming error.  
Data storage error.  
During firmware update.  
During firmware update.  
For any of these errors, return the  
unit to the supplier.  
While saving port settings or  
changing the password.  
System stopped!  
During firmware update.  
 
       
SPECIFICATIONS  
B
This appendix lists the specifications for the SuperStack II Hub 1000 SX.  
Physical Dimensions  
Height:  
Width:  
Depth:  
4.37 cm (1.72 in.)  
43.94 cm (17.3 in.)  
30.48 cm (12 in.)  
Weight: 5.5 kg (12 lb)  
Environmental Operating Ranges  
Operating temperature: 0˚ to 50 ˚C (32˚ to 122 ˚F)  
Storage temperature:  
Operating humidity:  
Storage humidity:  
–30˚ to 60 ˚C (–22˚ to 140 ˚F)  
10% to 90% relative humidity, noncondensing  
10% to 95% relative humidity, noncondensing  
Electrostatic discharge: Does not exceed 25 kV  
Operating altitude:  
–300 to 3000 meters (–296 to 9840 ft)  
Power Requirements  
AC input voltage:  
90–264 V; 115–230 V nominal  
Input frequency range: 47–63 Hz, single phase AC  
Inrush current:  
40 A peak maximum at cold start for half cycle  
at any rated input voltage; no damage to the  
supply from repeated on/off/on cycles under hot  
or cold conditions  
AC input isolation:  
Between primary and secondary circuits: 3000 V  
Between primary circuit and chassis: 1500 V  
Power consumption: 65 W maximum  
Heat output:  
Fuse:  
90 BTU/hr  
Fast-blow, 250 VAC, 3.15 A, high  
breaking capacity  
 
               
 
TECHNICAL SUPPORT  
C
3Com provides easy access to technical support information through a  
variety of services. This appendix describes these services.  
Information contained in this appendix is correct at time of publication.  
For the very latest, we recommend that you access 3Com Corporations  
World Wide Web site.  
Online Technical  
Services  
3Com offers worldwide product support 24 hours a day, 7 days a week,  
through the following online systems:  
World Wide Web site  
3Com Bulletin Board Service (3ComBBS)  
SM  
3ComFacts automated fax service  
3ComForum on CompuServe online service  
World Wide Web Site Access the latest networking information on 3Com Corporations  
World Wide Web site by entering our URL into your Internet browser:  
This service features the latest information about 3Com solutions and  
technologies, customer service and support, news about the company,  
Net Age® Magazine, technical documentation, and more.  
3Com Bulletin 3ComBBS contains patches, software, and drivers for all 3Com products,  
Board Service as well as technical articles. This service is available through analog  
modem or digital modem (ISDN) 24 hours a day, 7 days a week.  
 
               
C-2  
APPENDIX C: TECHNICAL SUPPORT  
Access by Analog Modem  
To reach the service by modem, set your modem to 8 data bits, no parity,  
and 1 stop bit. Call the telephone number nearest you:  
Country  
Australia  
Brazil  
Data Rate  
Telephone Number  
61 2 9955 2073  
55 11 5181 9666  
33 1 6986 6954  
4989 62732 188  
852 2537 5601  
39 2 27300680  
81 3 3345 7266  
52 5 520 7835  
up to 14400 bps  
up to 14400 bps  
up to 14400 bps  
up to 28800 bps  
up to 14400 bps  
up to 14400 bps  
up to 14400 bps  
up to 28800 bps  
up to 14400 bps  
up to 14400 bps  
up to 28800 bps  
up to 28800 bps  
France  
Germany  
Hong Kong  
Italy  
Japan  
Mexico  
P.R. of China  
Taiwan, R.O.C.  
U.K.  
86 10 684 92351  
886 2 377 5840  
44 1442 438278  
1 408 980 8204  
U.S.A.  
Access by Digital Modem  
ISDN users can dial in to 3ComBBS using a digital modem for fast  
access up to 56 Kbps. To access 3ComBBS using ISDN, use the  
following number:  
1 408 654 2703  
3ComFacts 3Com Corporations interactive fax service, 3ComFacts, provides data  
Automated sheets, technical articles, diagrams, and troubleshooting instructions on  
Fax Service 3Com products 24 hours a day, 7 days a week.  
Call 3ComFacts using your Touch-Tone telephone using one of these  
international access numbers:  
Country  
U.K.  
Telephone Number  
44 1442 438279  
1 408 727 7021  
U.S.A.  
 
       
Support from Your Network Supplier C-3  
Local access numbers are available within the following countries:  
Telephone  
Number  
Telephone  
Number  
Country  
Australia  
Belgium  
Denmark  
Finland  
France  
Country  
Netherlands  
Norway  
1800 123 853  
0800 71279  
800 17319  
0800 0228049  
800 11062  
Portugal  
0505 442 607  
956 0815  
98 001 4444  
0800 908158  
0130 81 80 63  
1678 99085  
Russia (Moscow only)  
Spain  
900 964 445  
020 792954  
0800 626403  
Germany  
Italy  
Sweden  
U.K.  
3ComForum on 3ComForum contains patches, software, drivers, and technical articles  
CompuServe about all 3Com products, as well as a messaging section for peer  
Online Service support. To use 3ComForum, you need a CompuServe account.  
To use 3ComForum:  
1 Log on to your CompuServe account.  
2 Type go threecom  
3 Press [Return] to see the 3ComForum main menu.  
Support from Your  
Network Supplier  
If additional assistance is required, contact your network supplier. Many  
suppliers are authorized 3Com service partners who are qualified to  
provide a variety of services, including network planning, installation,  
hardware maintenance, application training, and support services.  
When you contact your network supplier for assistance, have the  
following information ready:  
A list of system hardware and software, including revision levels  
Diagnostic error messages  
Details about recent configuration changes, if applicable  
If you are unable to contact your network supplier, see the following  
section on how to contact 3Com.  
 
       
C-4  
APPENDIX C: TECHNICAL SUPPORT  
Support from 3Com If you are unable to receive support from your network supplier, technical  
support contracts are available from 3Com.  
Contact your local 3Com sales office to find your authorized service  
provider using one of these numbers:  
Regional Sales Office Telephone Number  
3Com Corporation  
Regional Sales Office Telephone Number  
3Com GmbH (cont’d)  
Germany  
P.O. Box 58145  
5400 Bayfront Plaza  
Santa Clara, California  
95052-8145  
800 NET 3Com  
49 30 34 98790 (Berlin)  
(Central European HQ) 49 89 627320 (Munich)  
Hungary  
Poland  
36 1 250 83 41  
48 22 6451351  
U.S.A.  
3Com Iberia  
Portugal  
Spain  
3Com Asia Limited  
Australia  
351 1 3404505  
34 1 5096900  
61 2 9937 5000 (Sydney)  
61 3 9866 8022 (Melbourne)  
852 2501 1111  
91 11 644 3974  
62 21 572 2088  
81 6 536 3303 (Osaka)  
81 3 3345 7251 (Tokyo)  
82 2 3455 6300  
60 3 732 7910  
64 9 366 9138  
3Com Latin America  
U.S. Headquarters  
Northern Latin America 305 261 3266 (Miami, Florida)  
Argentina  
Brazil  
Hong Kong  
India  
Indonesia  
Japan  
408 326 2093  
541 312 3266  
55 11 5181 0869  
562 633 9242  
57 1 629 4847  
52 5 520 7841/7847  
51 1 221 5399  
58 2 953 8122  
Chile  
Korea  
Malaysia  
New Zealand  
Philippines  
P.R. of China  
Colombia  
Mexico  
Peru  
632 892 4476  
Venezuela  
8610 68492568 (Beijing)  
86 21 63501581 (Shanghai)  
65 538 9368  
886 2 377 5850  
662 231 8151 5  
3Com Mediterraneo  
Italy  
Singapore  
Taiwan, R.O.C.  
Thailand  
39 2 253011 (Milan)  
39 6 5279941 (Rome)  
3Com Middle East  
971 4 349049  
3Com Austria  
43 1 580 17 0  
3Com Nordic AB  
Denmark  
Finland  
3Com Benelux B.V.  
Belgium  
45 39 27 85 00  
358 0 435 420 67  
47 22 58 47 00  
46 8 632 56 00  
32 2 725 0202  
Netherlands  
31 0346 586211  
Norway  
Sweden  
3Com Canada  
Calgary  
Edmonton  
Montreal  
Ottawa  
Toronto  
Vancouver  
403 265 3266  
403 423 3266  
514 683 3266  
613 566 7055  
416 498 3266  
604 434 3266  
3Com Russia  
007 095 258 09 40  
3Com Southern Africa 27 11 807 4397  
3Com Switzerland  
41 31 996 14 14  
3Com Technologies  
Ireland  
353 1 820 7077  
3Com France  
33 1 69 86 68 00  
3Com U.K. Ltd.  
44 131 240 2900 (Edinburgh)  
44 161 873 7717 (Manchester)  
44 1628 897000 (Marlow)  
3Com GmbH  
Czech Republic/Slovak  
Republic  
420 2 21845 800  
 
   
Returning Products for Repair C-5  
Returning Products  
for Repair  
Before you send a product directly to 3Com for repair, you must first  
obtain a Return Materials Authorization (RMA) number. Products sent to  
3Com without RMA numbers will be returned to the sender unopened,  
at the senders expense.  
To obtain an RMA number, call or fax:  
Country  
Telephone Number  
1 800 876 3266, option 2  
1 408 326 2927  
Fax Number  
U.S.A. and Canada  
Latin America  
408 764 7120  
408 764 7120  
44 1442 435822  
Europe, South Africa, and  
Middle East  
44 1442 435860  
Elsewhere  
1 408 326 2926  
1 408 764 7120  
 
   
 
GLOSSARY  
10BASE-T The IEEE 802.3 physical layer specification for a 10 Mbps Ethernet  
network over two pairs of Category 3, 4, or 5 UTP wire.  
100BASE-T The group of IEEE 802.3 physical layer specifications for a 100 Mbps  
Ethernet network over various wiring specifications.  
1000BASE-X The group of IEEE 802.3 physical layer specifications for a 1000 Mbps  
Ethernet network over various wiring specifications.  
1000BASE-CX The IEEE 802.3 physical layer specification for a 1000 Mbps Ethernet  
network over short-haul shielded balanced copper cable (known as  
twinaxial STP).  
1000BASE-LX The IEEE 802.3 physical layer specification for a 1000 Mbps Ethernet  
network over long laser wavelength (1300 nm) multimode fiber (MMF)  
or single-mode fiber (SMF) cable.  
1000BASE-SX The IEEE 802.3 physical layer specification for a 1000 Mbps Ethernet  
network over short laser wavelength (850 nm) MMF or SMF cable.  
Advanced RPS 3Com SuperStack II Advanced Redundant Power System.  
asymmetric A relationship between linked network devices in which only one of the  
flow control devices can receive pause frames. See also flow control, pause frame,  
symmetric flow control.  
auto-negotiation A method by which linked devices advertise their signaling capabilities  
(such as protocol, speed, media type, and flow control capabilities) and  
automatically select their best common mode of communication.  
backbone The main transmission medium used to interconnect the workgroup  
areas of a network. Fiber-optic cable is often used for the backbone  
connection.  
 
 
2
GLOSSARY  
bidirectional See symmetric flow control.  
flow control  
CSMA/CD Carrier Sense Multiple Access/Collision Detection. Channel access  
method used by Ethernet and IEEE 802.3 in which devices transmit only  
after finding the data channel clear for some period. When two devices  
transmit simultaneously, a collision occurs and the colliding devices  
delay their retransmissions for a random length of time.  
Ethernet A local area network standard defining a physical medium and its  
method of placing data, or packet signaling, on a cable. Access to the  
cable is based on CSMA/CD (Carrier Sense Multiple Access/Collision  
Detection).  
Fast Ethernet A 100 Mbps technology based on the Ethernet CSMA/CD network  
access method.  
fiber-optic cable Cable consisting of a glass center, cladding, a buffer layer, strength  
members, and a cable sheath. The glass center supports the  
transmission of light signals.  
flow control A method for ensuring that a transmitting entity does not overwhelm a  
receiving entity with data. See also asymmetric flow control, incoming  
flow control, outgoing flow control, pause frame, symmetric flow  
control.  
forced link A method by which devices link with fixed and matching signaling  
capabilities. See also auto-negotiation.  
full-duplex The ability of a device or line to transmit data simultaneously in both  
directions. See also half-duplex.  
Gigabit Ethernet A 1000 Mbps network technology that retains support for  
10/100 Mbps Ethernet CSMA/CD networks.  
half-duplex Data transmission that can occur in two directions over a single line,  
but in only one direction at a time. See also full-duplex.  
hub A device used to provide connectivity between network devices. Hubs  
perform the basic repeater functions of restoring signal amplitude and  
timing, detecting collisions, and broadcasting signals to network  
devices. See also repeater.  
 
GLOSSARY  
3
IEEE Institute of Electrical and Electronics Engineers. Committees that  
develop and propose computer standards, such as the 802 protocols,  
which define the physical and data link protocols of communication  
networks. Members represent an international cross section of users,  
vendors, and engineering professionals.  
incoming The ability of a device to receive pause frames. See symmetric  
flow control flow control.  
LAN Local area network. An assembly of computing resources such as PCs,  
printers, minicomputers, and mainframe computers linked by a  
common transmission medium, such as UTP.  
LED Light-emitting diode. A diode that converts voltage to light and that is  
commonly used in digital displays.  
MAC Media Access Control. The data link sublayer that is responsible for  
transferring data to and from the physical layer.  
Mbps Megabits per second.  
outgoing The ability of a device to send pause frames. See Asymmetric  
flow control flow control.  
partition A repeater function that isolates a particular port from the network  
because of an excessive number of collisions. Once the problem  
causing the collisions is corrected, the port is reactivated.  
pause frame A set of bits that tells a transmitting device to stop the transmission of  
data frames for a specified period or to resume the transmission of  
data frames.  
power workgroup A small number of servers or a small number of sophisticated users  
on high-end workstations. A power workgroup requires very high  
performance to run applications that move and process massive  
amounts of data in real time (for example, medical imaging, video  
editing, film postproduction, CAD/CAM, or digital prepress).  
repeater A device that extends the length, topology, or interconnectivity of  
the physical medium beyond that imposed by a single segment, up  
to the maximum allowable end-to-end trunk transmission line length.  
Repeaters perform the basic actions of restoring signal amplitude,  
waveform, and timing applied to normal data and collision signals.  
See also hub.  
 
4
GLOSSARY  
SC A fiber-optic cable connector. When it is pushed into place, the  
connector is seated automatically.  
STP Shielded twisted-pair. Shielded four-conductor electrical cable that  
offers high-speed transmission for long distances.  
SuperStack 3Com system of stackable hubs, servers, switches, routers, SDLC  
converters, and power supplies. SuperStack systems can support a  
range of LAN environments, including Ethernet, token ring, FDDI,  
SNA, and ATM.  
symmetric A relationship between linked network devices in which both devices  
flow control can send and receive pause frames. Also called bidirectional flow  
control. See also asymmetric flow control, flow control, pause frame.  
twisted-pair Wiring similar to that found in the telephone system, consisting of two  
insulated wires loosely twisted around each other to help cancel out  
induced noise in balanced circuits.  
UTP Unshielded twisted-pair. A cable consisting of two or more pairs of  
twisted copper wires that are not shielded.  
 
INDEX  
C
Symbols  
% BW usage meter 2-6  
cables 2-5, 2-7, 2-9, 3-1  
RPS 2-11  
carrier integrity monitor 1-4  
CompuServe C-3  
configuration 1-1, A-1  
auto-negotiation 1-3  
forced link A-8  
Numbers  
1000BASE-CX 1-2  
1000BASE-LX 1-2  
1000BASE-SX 1-2  
3C16925 Gigabit Ethernet SX uplink module 3-3  
3C985-SX Gigabit EtherLink Server NIC 3-2  
3Com Bulletin Board Service (3ComBBS) C-1  
3Com sales offices C-4  
configuring port settings A-5  
connections  
console port A-2  
downlink 2-5  
3Com URL C-1  
guidelines 3-1  
3ComFacts C-2  
power workgroup 3-2  
uplink 3-5  
3ComForum C-3  
console interface (CLI) A-1  
console port 2-3, A-1  
connecting A-2  
A
AC  
requirements A-2  
power 2-9  
conventions  
power cord 2-1, 2-3  
ACTIVITY LED 2-6  
cabling options 2-9  
configuration options 2-10  
Power Modules 2-9  
aggregating devices  
servers 3-2  
text, About This Guide  
CSMA/CD 1-1  
2
D
DC power 2-9  
disabling a port A-7  
switches 3-3  
asymmetric flow control 3-6  
definition 1-3  
auto-negotiation  
displaying hub status A-13  
downlinks 1-2, 2-2  
defined 1-3  
disabling A-8  
aggregating servers 3-2  
aggregating switches 3-3  
cabling 2-5  
connections 2-5  
flow control 1-3  
B
backbone 1-2, 3-2, 3-5  
bandwidth aggregation 3-3  
bidirectional flow control 1-3  
bulletin board service C-1  
 
 
2
INDEX  
at power on 2-5  
descriptions 2-6  
E
GBIC module 2-8  
hub desktop placement 2-5  
hub rack mounting 2-3  
F
flow control 1-2, A-10  
forced link 1-3, A-8  
frames  
aging 1-4  
L
pause 1-2  
LED  
front panel 2-2  
full redundancy for Advanced RPS 2-10  
full resilience 2-10  
full-duplex operation 1-2  
fuse B-1  
descriptions 2-6  
indicators 1-4  
managed redundancy for Advanced RPS 2-10  
maximum cable length 2-7  
downlink connections 2-5  
Gigabit Ethernet 3-1  
media access control 1-4  
G
cabling 2-7  
connections 3-2  
connector types 2-7  
installation 2-8  
GBIC port 2-3  
Gigabit Ethernet  
N
technology, definition 1-1  
uplink module 3-3  
outgoing flow control 1-2  
OVERTEMP LED 2-6  
H
hub  
connections 3-1  
features and functions 1-4  
front panel 2-2  
indicators and LEDs 2-6  
installation 2-3  
rack mounting 2-3  
rear panel 2-3  
P
pause frames 1-2  
PAUSE LED 2-6  
status A-12, A-13  
hub operation LEDs 2-6  
access, round-robin 1-2, 1-4  
disabling A-7  
GBIC 2-3  
I
reconfiguration A-5  
asymmetric flow control A-10  
restoring factory defaults A-14  
Port Configuration menu A-6  
PORT STATUS LEDs 2-6  
IEEE specifications  
802.3x 1-2  
802.3z 1-4  
incoming flow control 1-2  
 
POST  
description 1-4  
diagnostics 2-6  
messages A-3  
power  
requirements B-1  
systems, optional 2-8  
RPS 2-11  
Power Modules 2-9, 2-10  
power on 2-5  
SuperStack II  
Advanced Redundant Power System (RPS) 1-1, 2-8  
Hub 1000 SX. See hub  
Switch 1000 3-3  
Switch 3000 3-3  
Switch 3900 3-3  
Switch 9300 3-2, 3-3, 3-5  
symmetric flow control 1-3  
power workgroup 3-2  
power-on self-test (POST)  
description 1-4  
T
diagnostics 2-6  
3Com URL C-1  
messages A-3  
PWR (power) LED 2-6  
bulletin board service C-1  
CompuServe service C-3  
fax service C-2  
R
network suppliers C-3  
product repair C-5  
troubleshooting 3-6  
trunking 3-3  
rack mounting  
instructions for 2-3  
kit 2-1  
rear panel 2-3  
reconfiguring ports A-5  
full 2-10  
maximum wattage 2-11  
UNIT STATUS LED 2-6  
uplink 1-2, 2-3  
managed 2-10  
requirements  
console port A-2  
power B-1  
resilience, full 2-10  
returning products for repair C-5  
RPS FAIL LED 2-6  
RPS ON LED 2-6  
backbone connection 3-2, 3-3  
connections 2-7, 3-5  
flow control 1-3, 3-6  
reconfiguring for asymmetric flow control A-10  
uses 1-2  
URL C-1  
S
safety precautions 2-1  
server farms 3-2  
World Wide Web (WWW) C-1  
servers, aggregating 3-2  
signal retiming 1-4  
site preparation 2-3  
specifications B-1  
Xmodem protocol A-2, A-16  
environmental operating ranges B-1  
physical dimensions B-1  
power requirements B-1  
standard usage for Advanced RPS 2-10  
status, hub A-13  
Y
Y cable 2-10  
 
 
3Com Corporation LIMITED WARRANTY  
+5 Limited Warranty  
The duration of the warranty for the SuperStack II Hub 1000 SX is five (5) years, with the exception of the product’s fans and power supplies, which  
are warranted for the first year only. Advance hardware replacement will be provided for one (1) year from your date of purchase, in accordance with  
3Com’s standard terms and conditions. An extension of the advance replacement coverage is available through the purchase of a service agreement. To  
qualify for the five year warranty and one year of advance hardware replacement, you must submit your warranty registration card to 3Com. If you do  
not submit your warranty registration card, the products will be covered by 3Com’s standard one year warranty.  
HARDWARE  
3Com warrants its hardware products to be free from defects in workmanship and materials, under  
normal use and service, for the following lengths of time from the date of purchase from 3Com or its  
Authorized Reseller:  
Network interface cards  
Lifetime  
Other hardware products (unless otherwise specified in the warranty statement above)  
Spare parts and spares kits  
1 year  
90 days  
If a product does not operate as warranted above during the applicable warranty period, 3Com shall, at its  
option and expense, repair the defective product or part, deliver to Customer an equivalent product or part  
to replace the defective item, or refund to Customer the purchase price paid for the defective product.  
All products that are replaced will become the property of 3Com. Replacement products may be new or  
reconditioned. Any replaced or repaired product or part has a ninety (90) day warranty or the remainder  
of the initial warranty period, whichever is longer.  
3Com shall not be responsible for any software, firmware, information, or memory data of Customer  
contained in, stored on, or integrated with any products returned to 3Com for repair, whether under  
warranty or not.  
SOFTWARE  
3Com warrants that the software programs licensed from it will perform in substantial conformance to the  
program specifications therefor for a period of ninety (90) days from the date of purchase from 3Com or  
its Authorized Reseller. 3Com warrants the media containing software against failure during the warranty  
period. No updates are provided. The sole obligation of 3Com with respect to this express warranty shall  
be (at the discretion of 3Com) to refund the purchase price paid by Customer for any defective software  
products, or to replace any defective media with software which substantially conforms to applicable 3Com  
published specifications. Customer assumes responsibility for the selection of the appropriate applications  
program and associated reference materials. 3Com makes no warranty or representation that its software  
products will work in combination with any hardware or applications software products provided by  
third parties, that the operation of the software products will be uninterrupted or error free, or that all  
defects in the software products will be corrected. For any third-party products listed in the 3Com software  
product documentation or specifications as being compatible, 3Com will make reasonable efforts to provide  
compatibility, except where the noncompatibility is caused by a “bug” or defect in the third party’s product.  
STANDARD WARRANTY  
SERVICE  
Standard warranty service for hardware products may be obtained by delivering the defective product,  
accompanied by a copy of the dated proof of purchase, to the 3Com Corporate Service Center or to an  
Authorized 3Com Service Center during the applicable warranty period. Standard warranty service for  
software products may be obtained by telephoning the 3Com Corporate Service Center or an Authorized  
3Com Service Center, within the warranty period. Products returned to the 3Com Corporate Service Center  
must be preauthorized by 3Com with a Return Material Authorization (RMA) number marked on the outside  
of the package, and sent prepaid, insured, and packaged appropriately for safe shipment. The repaired or  
replaced item will be shipped to Customer, at the expense of 3Com, not later than thirty (30) days after  
receipt of the defective product by 3Com.  
WARRANTIES EXCLUSIVE  
IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE, CUSTOMER’S SOLE REMEDY FOR  
BREACH OF THAT WARRANTY SHALL BE REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE  
PAID, AT THE OPTION OF 3COM. TO THE FULL EXTENT ALLOWED BY LAW, THE FOREGOING WARRANTIES  
AND REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER WARRANTIES, TERMS, OR CONDITIONS,  
EXPRESS OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, STATUTORY OR OTHERWISE, INCLUDING  
WARRANTIES, TERMS, OR CONDITIONS OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND  
SATISFACTORY QUALITY. 3COM NEITHER ASSUMES NOR AUTHORIZES ANY OTHER PERSON TO ASSUME  
FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE, OR USE OF  
ITS PRODUCTS.  
3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION DISCLOSE THAT  
THE ALLEGED DEFECT IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED BY CUSTOMER’S OR ANY THIRD  
PERSON’S MISUSE, NEGLECT, IMPROPER INSTALLATION OR TESTING, UNAUTHORIZED ATTEMPTS TO REPAIR  
OR MODIFY, OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE, OR BY ACCIDENT, FIRE,  
LIGHTNING, OR OTHER HAZARD.  
 
 
LIMITATION OF LIABILITY  
TO THE FULL EXTENT ALLOWED BY LAW, 3COM ALSO EXCLUDES FOR ITSELF AND ITS SUPPLIERS ANY  
LIABILITY, WHETHER BASED IN CONTRACT OR TORT (INCLUDING NEGLIGENCE), FOR INCIDENTAL,  
CONSEQUENTIAL, INDIRECT, SPECIAL, OR PUNITIVE DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE  
OR PROFITS, LOSS OF BUSINESS, LOSS OF INFORMATION OR DATA, OR OTHER FINANCIAL LOSS ARISING  
OUT OF OR IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE, USE, PERFORMANCE, FAILURE,  
OR INTERRUPTION OF ITS PRODUCTS, EVEN IF 3COM OR ITS AUTHORIZED RESELLER HAS BEEN ADVISED OF  
THE POSSIBILITY OF SUCH DAMAGES, AND LIMITS ITS LIABILITY TO REPAIR, REPLACEMENT, OR REFUND OF  
THE PURCHASE PRICE PAID, AT THE OPTION OF 3COM. THIS DISCLAIMER OF LIABILITY FOR DAMAGES WILL  
NOT BE AFFECTED IF ANY REMEDY PROVIDED HEREIN SHALL FAIL OF ITS ESSENTIAL PURPOSE.  
GOVERNING LAW  
This Limited Warranty shall be governed by the laws of the State of California, U.S.A. Some countries, states,  
or provinces do not allow the exclusion or limitation of implied warranties or the limitation of incidental or  
consequential damages for certain products supplied to consumers or the limitation of liability for personal  
injury, so the above limitations and exclusions may be limited in their application to you. This warranty gives  
you specific legal rights which may vary depending on local law.  
3Com Corporation, 5400 Bayfront Plaza, Santa Clara, CA 95052-8145 (408) 764-5000  
FCC CLASS A VERIFICATION STATEMENT  
WARNING: This equipment has been tested and found to comply with the limits for a Class A digital device,  
pursuant to Part 15 of the FCC Rules, and the Canadian Department of Communications Equipment  
Standards entitled, “Digital Apparatus,” ICES-003. These limits are designed to provide reasonable protection  
against harmful interference in a commercial installation. This equipment generates, uses and can radiate  
radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful  
interference to radio communications. Operation of this equipment in a residential area is likely to cause  
harmful interference, in which case, the user will be required to correct the interference at the user’s  
own expense.  
Changes or modifications not expressly approved by 3Com could void the user’s authority to operate  
this equipment.  
 
 

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