Section 61102040L4-5B
Issue 2, January 2001
CLEI Code #5SC597IF_ _
SLC-5 U-BR1TE III w/PWR and DDS Loopbacks
ISDN 2B1Q Interface
Installation and Maintenance
CONTENTS
1. GENERAL .............................................................................. 1
2. INSTALLATION.................................................................... 3
3. TESTING ................................................................................ 8
4. MAINTENANCE ................................................................. 13
5. WARRANTY AND CUSTOMER SERVICE ..................... 13
UBR1TE
PWR / DDSIII
1
102040L4
ACT
CR
LP
B
2
FIGURES
SW1
B
1
Figure 1. ADTRAN SLC-5 U-BR1TE III................................. 1
Figure 2. SLC-5 U-BR1TE Slot Placement Examples ............. 3
Figure 3. Backplane Pin Assignments ...................................... 4
Figure 4. SW1 and SW2 Labeling ............................................ 4
Figure 5. Position Switch Settings at Network Locations for
ISDN Applications ..................................................... 6
Figure 6. SLC-5 U-BR1TE III IDSL/DDS Circuit Diagram.... 7
Figure 7. IDSL/DDS Loopback Response .............................. 11
Figure 8. ADTRAN U-BR1TE Bidirectional Loopback ........ 11
Figure 9. IDSL/DDS Remote End Initiated Loopback, Local
Loop.......................................................................... 12
Figure 10. IDSL/DDS Remote End Initiated Loopback,
Customer Loop ......................................................... 12
Figure 11. IDSL/DDS Trouble Codes ....................................... 13
SW3
SW2
TABLES
Figure 1. ADTRAN SLC-5 U-BR1TE III
Table 1. SLC-2000 CIT Provisioning Options ........................... 3
Table 2. Internal Switch Option Settings .................................... 5
Table 3. Rotary Switch Legend ................................................... 8
Table 4. Front Panel LED Indication .......................................... 9
Functional Description
The U-BR1TE III is a channel unit for use in the
AT&T® SLC Series 5 and Series 2000 Digital Loop
Carrier Systems. The SLC-5 U-BR1TE III w/PWR
and DDS Loopbacks combines the functionality of a
standard SLC-5 U-BR1TE III and a U-Repeater
Powering Module which will simplify the installation
of the U-Repeater when deployed from a Digital Loop
Carrier (DLC) facility. Span powering also allows
deployment of 2-wire DDS when an IDSL OCU-R is
used to terminate the ISDN local loop. This eliminates
the need to provide AC power at the customer premises.
1. GENERAL
This practice provides installation and maintenance
information for the ADTRANSLC-5 U-BR1TE III w/
PWR and DDS Loopbacks (U-BR1TE III). Figure 1
is an illustration of the unit. The 1102040L4 is a
direct replacement and fully compatible with the
previous ADTRAN SLC-5 U-BR1TEs, including the
1100040L1, 1100040L3, 1102040L2, and the
1102040L1.
The U-BR1TE III can be used in SLC-5 Central
Office Terminal (COT) deployed as Feature Package
C (FPC), and SLC-5 Remote Terminals (RT)
ISDN/DDS
The U-BR1TE III employs features for both ISDN and
DDS transport. ISDN comprises the major
functionality and is described in this section.
A description of DDS functionality is located in
Section 3.
deployed as Feature Package C without Autocut
(FPC/AC) and Feature Package B. The U-BR1TE III
will also operate in SLC-2000 COTs and RTs when
deployed as SLC Mode 1. Clear Channel capability
(B8ZS) is not required of the T1 facility if zero byte
substitution (ZBS) is enabled on the U-BR1TE III.
The U-BR1TE III plugs into a single physical slot of
the channel bank. Three time slots are required for
Revision History
This document has been revised to correct switch
SW1-5 function described in Table 2.
Trademarks: Any
and product names included
this document are
61102040L4-5B
brandnames in
1
trademarks, registered trademarks, or trade names of their respective holders.
The U-BR1TE III will function with any ISDN 2B1Q
U-interface that is ANSI T1.601 compliant.
I
2B+D
1
2B+D
2
Empty
3
2. INSTALLATION
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
Available
for Other
Services
II
2B+D
4
Empty
5
HANDLING PRECAUTIONS REQUIRED.
6
After unpacking the unit, inspect it for damage. If
damage is noted, file a claim with the carrier, then
contact ADTRAN. See Warranty and Customer
Service.
Available
for Other
Services
III
IV
2B+D
8
Empty
9
To install the U-BR1TE III, hold the unit by the front
panel and insert it into the assigned slot until the edge
connector is firmly seated in the backplane. The ACT
LED on the U-BR1TE III should illuminate GREEN.
The CR and LP LEDs will flash GREEN then
illuminate AMBER. At this point, push the unit latch
upward until it locks into place.
7
1B+D
or
2B
1B+D
or
2B
Available
for Other
Services
10
11
12
NOTE
Figure 2. SLC-5 U-BR1TE Slot Placement
Examples
During installation rotary switch SW3 can be in
anypositionexcept7(LPBK). LPBKisreserved
for special testing functions.
SLC 2000
The U-BR1TE III operates in all SLC-2000 COT and
RT shelves and can be used in combination with any
mix of other SLC-2000 channel units. Currently, the
unit will not operate in a mode 2 shelf. All option
information for SLC-2000 channel units is entered
using the SLC-2000 Craft Interface Terminal (CIT)
and stored in the controller’s nonvolatile system
memory. Once a slot is provisioned, it does not need
to be provisioned again unless a different channel unit
is installed in that slot.
SLC-5
The U-BR1TE III plugs into a single SLC-5 channel
slot. Because two time slots are assigned to each
physical slot in a SLC-5 channel bank, and a U-BR1TE
III provisioned as 2B+D requires three time slots,
there are restrictions that apply to the physical
placement of the U-BR1TE III in the channel bank.
Each SLC-5 digroup consists of 12 physical slots,
which can be divided into four groups of three slots
each (physical slots 1-3, 4-6, 7-9, and 10-12). These
tri-slot groups are used to define the slot restrictions
for the U-BR1TE III as follows (see Figure 2):
Table 1 lists the options to set for the U-BR1TE III.
The service provisioned should match the switch
settings or the unit may not operate properly.
• A U-BR1TE III provisioned as 2B+D cannot be
installed in the last slot of a tri-slot group (slots
3, 6, 9, or 12).
Table 1. SLC-2000 CIT Provisioning Options
Option
CLEI
SLC-2000 COT
5SC1JE
SLC-2000 RT
5SC1HE
• A U-BR1TE III provisioned as anything other
than 2B+D cannot be installed in the physical
slot to the immediate right of a U-BR1TE III
provisioned as 2B+D within a tri-slot group.
Function
Code
BRI
BRI
Service
2B+D, B1+D,
B2+D, D
2B+D, B1+D,
B2+D, D
BRI = Basic Rate Interface
61102040L4-5B
Section 61102040L4-5, Issue 2
3
Interface Requirements
The U-BR1TE III unit includes two interfaces. The
loop-side interface is an ISDN U-interface which is
used to deliver Basic Rate service. The carrier-side
interface is a SLC-5 or SLC-2000 channel bank
interface which is used to insert data into the 1.544
Mbps T1 stream. Only the polarity insensitive Tip
and Ring leads are used in the cross-connection.
NOTE
WhentheU-BR1TEIIIisoptionedforB1orB2,
the SLC-2000 slot must be provisioned for D
only. If the U-BR1TE III is optioned for 2B,
then the SLC-2000 slot must be provisioned for
B1+D.
Switch Option Settings
Physical Requirements
See Figure 1 and Figure 4 for SW1 and SW2 location.
The options for SW1 and SW2 are described in
Table 2.
The U-BR1TE III occupies one physical slot in the
SLC-5 or SLC-2000 channel bank. The backplane pin
assignments are illustrated in Figure 3.
LULT
(RT)
ADJ
2
1
2
3
4
5
O
N
1
O
N
+5 S
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
+5 S
SW2
-5 V
NSYNC
CTPCM
CRPCM
NPE
+5R
+5R
LUNT
(COT)
TANDEM
GND
GND
GND
DCU
GND
NSR
DCU
8 KHz
GND
LULT
(RT)
ADJ
2
1
O
N
1
2
3
4
5
O
N
LUNT
TANDEM
4 MHz
NQ
(COT)
NP0
SW1
MSG
NMP
NMQ
Figure 4. SW1 and SW2 Labeling
64 KHz
CHTR
CHTT
LPTR
LPTT
8
7
RING *
TIP *
6
5
4
3
RG
2
-48 V
FRGRD
1
*2B1Q Signal Terminal
Figure 3. Backplane Pin Assignments
4
Section 61102040L4-5, Issue 2
61102040L4-5B
Table 2. Internal Switch Option Settings
Switch
Label
Function
Description
SW1-1
SW1-2
SW1-3
B1
B2
D
Service Level Selection
Selects the service level. The U-BR1TE III may be
optioned to deliver full ISDN (2B+D) or any of the
following levels of service.
Service
Option
SW1-1
(B1)
SW1-2
(B2)
SW1-3
(D)
Service Type
ISDN
Leased (128 kbps)
ISDN/ DDS
ISDN
*2B+D
2B
On
On
On
Off
On
Off
Off
On
On
Off
On
Off
On
Off
On
Off
On
On
Off
Off
On
B1+D
B2+D
B1
DDS/Leased
Leased
B2
ISDN
D
In 2B+D, B1+D, or B2+D the ZBS option must be set the same
for the COT and RT. SW1-4 should be set toward "ZBS ENA"
for AMI-provisioned carriers. The switch setting is optional for
B8ZS-provisioned carriers. In non-D channel modes ZBS must
be disabled when DDS service rate is 64 kbps, or 56 kbps with
secondary channel. Consult local provisioning guidelines.
SW1-4
On
ZBS EN
Enables ZBS
Disables ZBS
Off
ZBS DIS*
SW1-5
Off
NORM*
POWER
Normal
No powering provided toward the customer U-interface
On
Powering provided toward
the customer U-interface.
Automatically determines which of the following modes of
operation is appropriate;
• Supply a constant 43 mA to power an ADTRAN ISDN
U-Repeater II, U-Repeater III, or IDSL DDS-R.
• Supply a constant -120 Vdc to power an ADTRAN
IDSL OCU-R.
SW2-1
On
Termination Mode
LULT Mode (RT typical)
This switch should be set toward "LULT" when the unit is
installed as Adjacent-to U-Repeater, Adjacent-to-Customer,
or Tandem Office Source configuration. This switch
should be set toward "LUNT" for Adjacent-to-Switch and
Tandem Office Sink configurations (See Figure 5).
LULT (RT)*
LUNT (COT)
Off
LUNT Mode (COT)
SW2-2
On
LULT Mode (SW2-1 On)
DC sealing current provided When used in an Adjacent-to-Customer configuration,
sealing current should be provided (SW2-2 On). In a
In the LULT(RT) mode, SW2-2 controls sealing current.
ADJ*
Off
On
Off
TANDEM
DC sealing current not
provided
Tandem Office Source, sealing current is not required, and
should be disabled (SW2-2 Off) (See Figure 5).
ADJ
LUNT Mode (SW2-1 Off) In the LUNT(COT) mode, SW2-2 controls periodic wake-
Periodic wake-up tone not
provided
up tone. Periodic wake-up tones should be disabled when
located in an Adjacent-to-Switch location (SW2-2 On).
Periodic wake-up tones are required (SW2-2 Off) when
located in a Tandem Office Sink configuration, or when
adjacent to a device requiring wake-up tones, such as a
Newbridge switch (See Figure 5).
TANDEM
Periodic wake-up tone
provided
Note: Power option should only be used in the LULT (RT) configuration.
*Factory Setting
61102040L4-5B
Section 61102040L4-5, Issue 2
5
Figure 5 displays the position switch settings at ISDN
network locations.
SLC-5
COT
SLC-5
RT
2-Wire
Loop
2-Wire
L
U
N
T
L
U
L
T
T Carrier
Customer
NT1
Note:
Channel
Bank
Channel
Bank
Refer to Table 2 for switch
function descriptions.
Adjacent to
Customer (Source)
Adjacent
to Switch
SW2-
SW2-
1 - LUNT (COT)
2 - ADJ
1 - LULT (RT)
2 - ADJ
SW1-
SW1-
5 - OFF
5 - OFF
D4/SLC-96
RT
SLC-5
D4/SLC- 96
SLC-5
COT
2-Wire
RT
COT
2-Wire
2-Wire
Loop
L
L
U
N
T
T Carrier
L
U
L
T
L
T Carrier
U
N
T
U
Customer
NT1
L
T
Channel
Bank
Channel
Bank
Channel
Bank
Channel
Bank
Adjacent to
Switch
(See Appropriate
I&M Practice)
Tandem
(Source)
(See Appropriate
I&M Practice)
Tandem
(Sink)
Adjacent to
Customer
(Source)
ISDN
Switch
SW2-
SW2-
1 - LUNT (COT)
2 - TANDEM
SW1-
1 - LULT (RT)
2 - ADJ
SW1-
5 - OFF
5 - OFF
SLC-5
COT
SLC-5
RT
2-Wire
Loop
2-Wire
Loop
2-Wire
L
U
N
T
L
T Carrier
ISDN
RPTR
U
Customer
NT1
L
T
U-Repeater
Adjacent to
Switch
Tandem Office
(Source) U-Repeater
SW2-
SW2-
1 - LUNT (COT)
2 - ADJ
1 - LULT (RT)
2 - TANDEM
SW1-
SW1-
5 - PWR
5 - OFF
Figure 5. Position Switch Settings at Network Locations for ISDN Applications
6
Section 61102040L4-5, Issue 2
61102040L4-5B
Figure 6 displays the position switch settings at
IDSL/DDS network locations.
SLC 5
T1
A
B
4W
Digital
2-Wire
Local
Loop
C
D
E
4W DS0 DP
or
OCU DP
4W DS0 DP
T1
Customer
Premises
4W DS0-DP
or DCS
COT
U-BR1TE
1B
RT
IDSL OCU-R
or
DCS
1
D4
D4
SW2-
1 - LULT
2 - ADJ
SW1-
1 - B1
2 - OFF
3 - OFF
4 - OFF
5 - PWR
Non-ADTRAN U-BR1TE 1B+D
A
2-Wire
Local
Loop
2W
Digital
B
C
D
E
4W DS0 DP
or
OCU DP
T1
U-BR1TE
1B
U-BR1TE
1B+D
T1
Customer
Premises
U-BR1TE
1B+D
RT
IDSL OCU-R
2
D4
COT
D4
1102040L4 Equipment Requirements
1
1
C: Must be 1102040L4 w/ power disabled or 1102040L3
D: Must be 1102040L4 w/ power enabled
2
2
B: Must be 1104020L4 w/ power disabled or 1104020L5,
per RFP# 99-7235-CS
C: Must be 1102040L4 w/ power disabled or 1102040L3
2 E: Requires local AC power
2 No SLC 5 U-BR1TEs are used in a non-SLC 5 DLC DDS Application
NOTE: Refer to Table 2 for DIP switch function descriptions.
Figure 6. SLC-5 U-BR1TE III IDSL/DDS Circuit Diagram
61102040L4-5B
Section 61102040L4-5, Issue 2
7
Front Panel Features
When used in B1 configuration (non-D channel modes
of operation) the U-BR1TE III will respond to an in-
band DS0 DP latching loopback sequence. When
remote testing is not available, or during
The RJ-45 jack allows front panel test access for local
or downstream loopbacks. The address select knob
(SW3) determines which element is being looped
back. Table 3 lists the loopback options.
troubleshooting, the U-BR1TE III front panel provides
local test capabilities for use with industry standard
Digital Logic Test Sets such as the TPI 108/109 or
equivalent testers. Available tests include a local
loopback, loopback of up to 5 addressable
Three LEDs on the front panel of the U-BR1TE III
report the synchronization and loopback status.
Descriptions of these LEDs are given in Table 4. The
SLC Series 5 COT must be externally timed from a
suitable composite clock with stratum one traceability.
downstream ISDN devices, loopback of the
customer’s NT1, and point-to-point testing in both the
upstream and downstream directions.
3. TESTING
The U-BR1TE III responds to embedded operation
channel loopbacks, including B1, B2, and 2B+D,
when configured for D channel operations.
NOTE
When a U-BR1TE III is performing a loopback,
the loopback occurs internal to the U-interface
transceiver.
Table 3. Rotary Switch Legend
Loopback Tests
Display
Name
Interpretation
Loopbacks in the network-to-customer direction can
be initiated from either the ISDN switch or the front
panel. Front panel initiated loopbacks are non-
obtrusive to unused channels, thereby preventing
synchronization loss or dropouts on the carrier or loop
while testing.
0
NT1
NT1, address of the NT1
latching OCU in DDS mode.
1
ADR1
ADR2
Address #1, address of this unit
2*
Address #2, the next downstream
unit away
3
4
ADR3
ADR4
ADR5
ADR6
LPBK
Address #3, the second unit
downstream
From the RJ-45 jack on the front panel, a DS0 digital
test set is used to inject the required 64 kbps test
pattern into the B1 or B2 channel. The address select
knob determines the downstream element to be looped
back, and the direction of rotation of the knob selects
which channel is to be looped back. Clockwise (CW)
rotation selects the B1 channel, and counterclockwise
(CCW) rotation selects the B2 channel. To initiate a
loopback, perform the following procedure:
Address #4, the third unit
downstream
5
Address #5, the fourth unit
downstream
6
Address #6, the fifth unit
downstream
7**
Loopback, forces this unit to
loopback the selected B1 or B2
channel. Loopbacks occur in both
the customer and network
directions.
1. Connect the DS0 tester to the RJ-45 jack.
2. Rotate the address select knob in the direction
associated with the desired loopback channel
until the desired downstream element address is
reached (see Table 3). The LEDs indicate
successful loopback activation according to Table
4.
8
9
CRTX
LPTX
Carrier transmit, in the carrier
direction
Loop transmit, in the loop
direction
3. Data is looped back at the selected address until
the jack is disconnected or the address select
knob is changed.
Clockwise rotation selects the B1 channel.
Counterclockwise rotation selects the B2 channel
*Factory Default Setting
Point-To-Point Test (CRTX/LPTX)
Point-to-point testing using a DS0 digital tester can be
performed to either the T1 carrier interface (SW3,
position 8), or the U-interface (SW3, position 9).
** Reserved for special testing
8
Section 61102040L4-5, Issue 2
61102040L4-5B
To initiate a point-to-point test, perform the
following:
Local Loopback
The U-BR1TE III incorporates a special test mode to
provide a local 2B+D bilateral loopback. Once
invoked, this test allows an upstream and downstream
test set to send a straight-away test pattern. To put the
U-BR1TE III into this test mode, select ADR7 on the
address select knob and insert the channel unit into the
channel bank. The CR and LP LEDs will flash
GREEN once the U-BR1TE III is in this special mode.
To discontinue the special test mode, turn SW3 in
either direction deselecting the ADR7 position. This
will cause the unit to reset and return to normal
operation.
1. Connect the DS0 digital tester to the RJ-45 jack.
2. Configure the test set for Near Logic and 64kbps.
3. Select the desired test direction and bearer
channel using the address select knob.
4. If the far-end unit is a SLC-5 U-BR1TE III,
perform steps 1-3, choosing the same front panel
selections. Ensure both test sets are configured
for the same test pattern (511, 2047).
5. If the far-end is another device, follow the
appropriate directions to provide a point-to-point
test.
Table 4. Front Panel LED Indication
LED
Color
Indication
LP (Loop)
Amber Synchronization over the loop has not been achieved.
Green Solid in response to a 2B+D loopback. Flashes once per second for B1, twice per
second for B2 in response to an eoc loopback from the loop side and during DS0
logic test when the remote unit has successfully looped over the loop side, or in
LPTX or CRTX testing.
Off Synchronization over the loop has been achieved. No loopbacks or tests are in
progress.
CR (Carrier)
Amber Synchronization over the carrier has not been achieved.
Green Solid in response to a 2B+D loopback. Flashes once per second for B1, twice per
second for B2 in response to an eoc loopback from the carrier side and during DS0
logic test when the remote unit has successfully looped over the carrier side, or in
LPTX or CRTX testing.
Off Synchronization over the carrier has been achieved. No loopbacks or tests are in
progress.
LP and CR
Amber U-BR1TE II channel unit has violated the physical slot restrictions or is not
(flashing) provisioned correctly.
Green BCU has been removed from service or the U-BR1TE II is in special test mode
(flashing) (refer to Local Loopback subsection).
CR (only)
Amber The channel bank has informed the U-BR1TE II that a network or trunk alarm is
(flashing) present.
ACT (Active)
Green ISDN Application - Indicates that the terminal equipment has exchanged ACT bits
with the ISDN switch.
DDS Application - Indicates loop is terminated with an OCU-R
Green ISDN Application - Once per second indicates that the ACT bit is being sent in one
(flashing) direction only.
61102040L4-5B
Section 61102040L4-5, Issue 2
9
When the U-BR1TE III operation is normal, the
ADR7 position of SW1 does not have a function.
of the U-interface between the LULT and the NT1.
Performance Monitoring TR829
The U-BR1TE III supports performance monitoring
remotely from the ISDN switch.
NOTE
This test option is only available on power up of
the U-BR1TE III.
IDSL/DDS Description
The U-BR1TE III may be deployed in the adjacent to
customer mode to provide transport for DDS/Frame
Relay services with an ADTRAN IDSL OCU-R. This
allows pair savings over traditional DDS deployment
on local loops up to 18 kft on mixed gauge wire. The
IDSL OCU-R is used to terminate the U-interface at
the customer premises provided by the U-BR1TE III
and to convert the 2-wire ISDN signal to a 4-wire
AMI DDS signal for presentation to the customer.
Together, the U-BR1TE III and IDSL OCU-R allow
testing over the ISDN transport network to be
performed with traditional DDS methods. In this
mode U-BR1TE IIIs may be placed in tandem and
function as DS0 DPs while the IDSL OCU-R
functions as an OCU. See Figure 6 for various
U-BR1TE III DDS arrangements.
ISDN Only - MLT Channel Test -LUNT Mode
When a Pair Gain Test Controller (PGTC) is
connected to the U-BR1TE III and the Test Initiate
Voltage (116 Vdc behind 8 kΩ) is applied to the Tip
with the Ring open, the following occurs:
1. The channel unit sends a Channel Test mp-eoc
message downstream to the LULT.
2. The unit produces a 333 Hz test tone between the
Tip and Ring leads. This tone is compliant with
TR-TSY-00465.
When the Test Initiate Voltage is removed, the test
tone is subsequently removed, the active test status
indication to the bank controller is removed, and the
Return to Normal mp-eoc message is sent to the
LULT. The channel unit then begins re-
DDS Testing
For leased mode or DDS applications with the
U-BR1TE III the D channel is typically disabled.
Without the D channel, standard ISDN eoc loopbacks
are unavailable to the ISDN transport system and
testing may only be accomplished by using the in-
band DDS loopback commands. The U-BR1TE III
responds to latching loopback sequences for the DS0
DP. The U-BR1TE III allows the OCU loopback
command to pass inband downstream to the IDSL
OCU-R.
synchronization of the U-interface between the LUNT
and the ISDN switch.
ISDN Only - MLT Channel Test -LULT Mode
When a PGTC initiates a channel test at the COT, the
COT channel unit sends a Channel Test mp-eoc
toward the LULT. Upon receipt by the LULT of this
mp-eoc message, the following events occur:
1. The channel unit informs the bank controller of a
test request.
Upon receipt of a DS0 DP latching loopback sequence
the U-BR1TE III initiates a bilateral loopback for the
B1 channel. This bilateral loopback allows testing of
the 2B1Q local loop to the IDSL OCU-R
2. Upon completion of handshaking with the channel
test equipment, the bank controller commands the
channel unit to close its channel test relay. This has
the effect of connecting the customer drop to the
common equipment through LPTT and LPTR and
the channel unit U-interface to CHTT and CHTR.
The test setup sequence is complete.
simultaneously with network testing to the U-BR1TE III.
3. Upon completion of the automatic test, the
channel unit is commanded by the bank
controller to de-energize the channel test relay.
4. Upon reception of the Return to Normal mp-eoc
message, the channel unit begins re-synchronization
10
Section 61102040L4-5, Issue 2
61102040L4-5B
DS0 DP Loopback eoc Remapping
3. Minimum of 100 loopback enable (LBE) bytes
(X1010110).
Upon receipt of subsequent DS0 DP loopback codes
when the D channel is disabled, the U-BR1TE III
remaps the subsequent DS0 DP loopback sequences
into the respective ISDN eoc loopback messages.
This capability will permit all downstream ISDN D
channel enabled U-BR1TEs, U-Repeaters, and
TRISDN elements to respond to standard DDS DS0
DP loopback commands via the ISDN eoc as shown in
Figure 7.
4. Minimum of 32 far-end voice (FEV) bytes
(X1011010).
If the U-interface of the U-BR1TE III is not in sync,
the unit transmits Mux-Out-of-Sync (X0011010)
upstream towards the network.
X Denotes Don’t Care bit - either a 1 or a 0.
Disabling DS0 DP, OCU, or CSU latching loopback
sequence:
Test
Head
1. Minimum sequence of 35 TIP bytes.
SLC-5
T1
ISDN
RPTR
IDSL
OCU-R
U-BR1TE
1B+D
U-BR1TE
1B
Front Panel Tests
The valid front panel tests in leased modes are ADR1,
CRTX, LPTX, and LPBK for all circuit positions.
NT1, ADR1-ADR6 loopback tests are valid for the
LULT mode only. ADR2 would be used to test a
U-Repeater or ADR2 and ADR3 would be used to test
TRISDN elements respectively.
OCU
DS0 DP #1
DS0 DP #3
DS0 DP #2
Loopback Response
Figure 7. IDSL/DDS Loopback Response
NOTE
For DDS circuits with the D channel disabled,
all tandem U-BR1TE elements should be
ADTRAN U-BR1TEs with DDS Loopback
Capability for remote end test operation (OCU)
to function properly. See 2B in Figure 6. In D
channel disabled applications, older non-DDS
vintage U-BRITEs may not pass the OCU
latchingloopbacksequencetotheIDSLOCU-R.
Initiate Loopback at IDSL OCU-R
When used for DDS, the SLC-5 U-BR1TE may
initiate a loopback at the IDSL OCU-R. The in-band
latching OCU loopback code is sent to loop the IDSL
OCU-R when the NT1 address is selected on SW3.
To invoke the OCU loopback at the IDSL OCU-R, the
front panel test knob must be in the NT1 address
location.
ADTRAN U-BR1TE Bidirectional Loopback
In LULT mode, the ADTRAN U-BR1TE will execute
a bidirectional loopback when performing DS0 DP
loopback. Refer to Figure 8 for an illustration of the
bidirectional loopback.
Upon receipt of an OCU latching loopback sequence
the U-BR1TE III passes the OCU sequence in-band
downstream to the IDSL OCU-R. U-BR1TE IIIs do
not respond to the CSU latching loopback command
but simultaneously passes it through to the CSU/DSU
while mapping the NT1 eoc address. The IDSL
OCU-R reverses sealing current on its 4-wire AMI
DDS interface to place the customer CSU into
loopback upon receipt of the CSU latching loopback.
The following data sequence enables the DS0 DP,
OCU, and CSU latching loopbacks:
ADTRAN U-BR1TE
IDSL OCU-R
1. Minimum of 35 transition in progress (TIP)
bytes (X0111010).
Test Set
2. Minimum of 35 loopback select code (LSC)
bytes: DS0 DP (X0000101), OCU (X1010101),
CSU (X0110001).
Bidirectional
loopback
Figure 8. ADTRAN U-BR1TE Bidirectional
Loopback
61102040L4-5B
Section 61102040L4-5, Issue 2
11
Remote End Initiated LBK Tests
If errors exist the loopbacks can help determine the
source; either the local loop or the IDSL OCU-R.
During a remote end initiated loopback the IDSL/DDS
system transmits ASC 9Eh towards the network,
indicating an out-of-service condition generated by the
remote end, as shown in Figures 9 and 10.
The U-BR1TE supports loopbacks generated from
the IDSL OCU-R which allow testing to be performed
without coordination with the CO or test center.
Loopbacks initiated by the OCU-R front panel LBK
pushbutton, aid in system turn-up testing or
troubleshooting from the remote end.
All IDSL/DDS system latching loopbacks, whether
initiated by the IDSL OCU-R craft interface, LBK
pushbutton, CO, or from a remote Test Center, may be
released by sending 35 DDS loop down TIP bytes
<X0111010> (Where X is a “don’t care” bit.) All
existing latching loopbacks may also be disabled by
pressing the LBK pushbutton on the CO or remote
unit.
The U-BR1TE responds to a loopback command
initiated at the OCU-R as follows:
Pressing the OCU-R LBK pushbutton once will
initiate a loopback at the U-BR1TE towards the
customer. See Figure 9. This allows data to be sent
from the remote end to test the local loop and the
IDSL OCU-R. This loopback is indicated by a
flashing CUST LBK LED on the IDSL OCU-R and a
solid LBK LED on the U-BR1TE.
NOTE
The remote end test feature is only supported
when the upstream U-BR1TE is an ADTRAN
D4 or Series 5 U-BR1TE with DDS Loopback
capability. Other U-BR1TEs will ignore the
loopback command sent by pressing the IDSL
OCU-R LBK button.
Pressing the OCU-R LBK pushbutton a second time
initiates a loopback at the OCU-R towards the 4-wire
DDS (CPE) interface. A solid CUST LBK LED on
the IDSL OCU-R indicates a loopback at the IDSL
OCU-R towards the customer equipment.
See Figure 10. Pressing the OCU-R LBK pushbutton
a third time disables all current latching loopbacks
initiated by the LBK pushbutton.
4-Wire
CPE Interface
IDSL
SLC-5
U-BR1TE
ASC 9Eh
Test
Set
OCU-R
Loopback
Pushbutton
Local Loop
Push once for SLC-5
U-BR1TE Loopback
Figure 9. IDSL/DDS Remote End Initiated Loopback, Local Loop
4-Wire
CPE Interface
ASC 9Eh
IDSL
ASC 9Eh
Test
Set
SLC-5
U-BR1TE
OCU-R
Loopback
Pushbutton
Local Loop
Push twice for IDSL OCU-R
Loopback
Figure 10. IDSL/DDS Remote End Initiated Loopback, Customer Loop
12
Section 61102040L4-5, Issue 2
61102040L4-5B
IDSL/DDS Trouble Code
Contact Customer and Product Service (CAPS) prior
to returning equipment to ADTRAN.
The IDSL/DDS system provides a quick diagnosis in
the case of a circuit condition where continuity is
broken. The trouble code type received by a tester
determines whether the open condition is occurring on
the local loop or at the customer premises. In the
event of a 2-wire DSL loss of signal, loss of sync, or
open condition caused by an open conductor or
disconnected 2-wire loop, the SLC 5 U-BR1TE III
transmits a Mux-Out-of-Sync trouble code (MOS
9Ah) into the network as shown in Figure 11. During
a similar out-of-service condition at the customer
premises, the IDSL OCU-R transmits Abnormal
Station Code (ASC 9Eh) upstream into the network as
shown in Figure 11.
For service, CAPS requests, or further information,
contact one of the following numbers:
ADTRAN Sales
Pricing/Availability
(800) 827-0807
ADTRAN Technical Support
Presales Applications/Postsales Technical Assistance
(888) 4-ADTRAN
Standard hours: Monday-Friday, 7 a.m. - 7 p.m. CST
Emergency hours: 7 days/week, 24 hours/day
4. MAINTENANCE
The U-BR1TE III does not require routine
maintenance for normal operation.
ADTRAN Repair/CAPS
Return for Repair/Upgrade
(256) 963-8722
5. WARRANTY AND CUSTOMER SERVICE
Repair and Return Address
ADTRAN, Inc.
CAPS
901 Explorer Boulevard
Huntsville, Alabama 35806-2807
ADTRAN will replace or repair this product within 10
years from the date of shipment if it does not meet its
published specifications or fails while in service (see
ADTRAN Carrier Networks Equipment Warranty,
Repair, and Return Policy and Procedure, document
60000087-10).
Channel Bank
Customer Premises
Open 2-wire Loop
MOS 9Ah
U-BR1TE
IDSL OCU-R
DSU
Channel Bank
Customer Premises
Open 4-Wire Customer
Interface
ASC 9Eh
ASC 9Eh
U-BR1TE
IDSL OCU-R
DSU
Figure 11. IDSL/DDS Trouble Codes
61102040L4-5B
Section 61102040L4-5, Issue 2
13
14
Section 61102040L4-5, Issue 2
61102040L4-5B
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