ADTRAN Network Card SLC 5 U BR1TE III User Manual

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.  
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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
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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  
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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
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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  
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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
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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  
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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
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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 k) 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  
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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  
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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  
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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  
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14  
Section 61102040L4-5, Issue 2  
61102040L4-5B  
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