ADTRAN Switch D4 U BR1TE V User Manual

Section 61104020L4-5C  
Issue 3, May 2002  
CLEI Code: D4C5BENB_ _  
D4 U-BR1TE V w/PWR and DDS Loopbacks  
ISDN 2B1Q Interface  
Installation and Maintenance  
CONTENTS  
1. GENERAL..................................................................1  
2. INSTALLATION .......................................................2  
3. TESTING....................................................................7  
4. MAINTENANCE .....................................................13  
5. WARRANTY AND CUSTOMER SERVICE.........14  
U-BR1TE V  
D4-UBR1PWR/DDS  
1104020L4  
LPBK CRTX  
AD6  
AD5  
AD4  
LPTX  
NT1  
AD1  
AD3  
B1  
AD2  
LP  
SW1  
SW3  
TEST  
B2  
CR  
ACT  
FIGURES  
Figure 1. ADTRAN U-BR1TE V .....................................1  
Figure 2. Backplane Pin Assignments ..............................3  
Figure 3. Time Slot Assignments for 2B+D Service in  
SLC Mode I w/ D1D Counting .........................3  
Figure 4. Time Slots that CANNOT Contain BR1TE  
Cards..................................................................4  
Figure 5. SW1, SW3, and SW6 Labeling.........................4  
Figure 6. Position Switch Settings at Network Locations  
for ISDN Applications ......................................6  
Figure 7. U-BR1TE V IDSL/DDS Circuit Diagram ......10  
Figure 8. IDSL/DDS Loopback Response .....................11  
Figure 9. ADTRAN U-BR1TE Bidirectional Loopback ..12  
Figure 10. IDSL/DDS Remote End Initiated Loopback,  
Local Loop ......................................................12  
Figure 11. IDSL/DDS Remote End Initiated Loopback,  
Customer Loop ................................................12  
Figure 12. IDSL/DDS Trouble Codes ..............................13  
Figure 13. DS0 Latching Loopback .................................14  
TEST  
ERR  
NORM  
PTRN  
SW2  
SW4  
OUT  
(Rx)  
L
O
G
I
IN  
(Tx)  
C
SW5  
SW6  
Figure 1. ADTRAN U-BR1TE V  
Functional Description  
The U-BR1TE V is a line card that plugs into a single  
channel slot of an AT&T D4/SLC®-96 channel bank.  
It provides an ISDN U-interface and allows the  
transport of Basic Rate 2B+D information over T1  
carriers and twisted pair wiring. The U-BR1TE V  
combines the functionality of a standard U-BR1TE V  
and a U-Repeater Powering Module which will  
simplify the installation of the U-Repeater. 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.  
TABLES  
Table 1. SW1, SW3, and SW6 Option Settings...............5  
Table 2. Rotary Switch Options .......................................7  
Table 3. LED Indication ...................................................7  
1. GENERAL  
This practice provides installation and maintenance  
procedures for the ADTRAN D4 U-BR1TE V w/PWR  
and DDS Loopbacks, P/N 1104020L4. Figure 1 is an  
illustration of the U-BR1TE V.  
The U-BR1TE V is used at both the Central Office  
Terminal and Remote Terminal locations. Clear  
channel capability (B8ZS) is not required of the T1  
facility if zero byte substitution is enabled. The  
U-BR1TE V plugs into a single channel slot of the D4  
bank, but can require three time slots when  
transporting 2B+D information. Block error rate  
performance over the T1 facility is monitored and is  
available to the network.  
ISDN/DDS  
The U-BR1TE 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.  
Revision History  
Issue 3 of this document includes 2B leased mode  
operation and revises the CLEI code.  
Trademarks: Any brand names and product names included in this document are  
trademarks, registered trademarks, or trade names of their respective holders.  
1
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In SLC-96 Mode I with D1D counting channel bank,  
the time slots are allocated as shown in Figure 3 with  
two time slots per physical channel slot.  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
1
FRM GND  
-12V  
GND  
+12V  
GND  
TWD  
TSP  
TSQ  
RNPCN  
2
+5V  
INCLK  
3
The unit uses two time slots in one physical slot and a  
time slot from an adjacent slot when configured for  
2B+D operation. When selected for Slot 1, 4, 7, or 10  
operation, the unit occupies the two time slots  
associated with the physical slot in which it resides  
and the upper time slot of the next adjacent physical  
slot.  
4
5
6
7
TDATA  
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
RCLK  
RWD  
RSQ  
TDCLK  
NGATE  
RSP  
RNDIS  
-48R  
When selected for Slot 2, 5, 8, or 11 operation, the unit  
occupies the lower time slot of the occupied physical  
slot and the adjacent two time slots of the next  
physical slot to the right. When using the Slot 2, 5, 8,  
11 option, the physical slot to the right must be left  
vacant. A unit selected for one or two time slots,  
B1+D, B2+D, B1, B2, 2B, and D only, occupies only  
the two time slots associated with the physical slot  
used. In this configuration, option the unit for Slot 1,  
4, 7, or 10.  
-48V  
NSEIZE  
R*  
GND  
T*  
MCLK  
*2B1Q Signal  
Terminals  
Figure 2. Backplane Pin Assignments  
PS1  
UTS  
PS2  
UTS  
PS3  
UTS  
PS4  
C1  
PS5  
C2  
PS6  
PS7 PS8 PS9 PS10 PS11 PS12  
C1  
C2  
C1  
C2  
C1  
C2  
*
LTS  
LTS  
LTS  
LTS = lower time slot  
PS = physical slot  
UTS = upper time slot  
C1 = physical location of U-BR1TE  
optioned as "slots 1, 4, 7, 10"  
(1 physical slot consists of 2 time slots)  
* = Must be empty - time slots are being used  
by U-BR1TE card in C2  
C2 = physical location of U-BR1TE  
optioned as "slots 2, 5, 8, 11"  
NOTE: Unoccupied slots should have blank panels installed to prevent inadvertant use.  
Figure 3. Time Slot Assignments for 2B+D Service in SLC Mode I w/ D1D Counting  
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See Figure 4 for additional channel slot deployment  
restrictions for each bank type.  
SLC-96 Bank Requirements  
The COT SLC-96 bank must be configured with a  
special service unit (SSU) selected for external timing.  
The COT SLC-96 bank must be provided with an  
external composite clock synchronized with the  
network.  
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10  
10  
11 12  
11 12  
Physical Slots  
Time Slots  
D4 Bank:  
D4 Channel  
Counting  
13  
13  
1
14 15  
14 15  
16  
16  
4
17  
17  
5
18  
18  
6
19  
19  
7
20  
20  
8
21  
21  
9
22  
22  
10  
14  
23  
24  
** **  
Interface Requirements  
23  
24 Physical Slots  
The U-BR1TE V 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 D4/SLC-96 channel bank interface  
which is used to insert data into the 1.544 Mbps T1  
stream. Only the polarity-insensitive T and R leads  
are used in the cross-connection.  
2
5
3
9
11 12  
Physical Slots  
Time Slots  
SLC-96  
Carrier  
Mode 1  
Terminal:  
D1D Channel  
Counting  
1
13  
17  
21  
2
6
10  
18 22  
**  
23  
**  
24  
3
7
11  
15  
19  
4
8
12  
16  
20  
1
3
2
3
4
5
6
7
4
8
8
9
10  
16  
11 12  
Physical Slots  
Time Slots  
SLC-96  
Carrier  
Mode 3  
Terminal:  
D1D Channel  
Counting  
*
*
7
11  
15  
19  
23  
12  
20  
24  
** **  
17  
** **  
18 22  
*
Option Switch Settings  
*
21  
1
5
9
13  
2
6
10  
14  
Figure 5 displays the locations for SW1, SW3, and  
SW6 on the U-BR1TE V. Table 1 contains the option  
settings for SW1, SW3, and SW6 of the U-BR1TE V.  
** **  
** **  
24 Physical Slots  
13  
1
14 15  
16  
4
17  
18  
19  
7
20  
8
21  
9
22  
10  
19  
23  
2
3
5
5
6
11 12  
Physical Slots  
D4 Bank:  
D1D Channel  
Counting, or  
SLC-96  
Carrier Mode  
3 Terminal:  
D4 Channel  
Counting  
*
1
3
7
9
11 13 15  
12 14 16  
17  
21  
23  
**  
**  
Time Slots  
*
2
4
6
8
10  
17  
18  
21  
20  
22  
22 24  
**  
24 Physical Slots  
**  
13  
14 15  
16  
18  
19  
20  
23  
A channel unit with B+D service cannot occupy this slot  
** A channel unit with 2B+D service cannot occupy this slot  
*
LULT(RT)  
ADJ  
O
N
1
2
1
2
3
4
5
6
O
N
SW3  
SW2  
Figure 4. Time Slots that CANNOT Contain  
BR1TE Cards  
LUNT(COT) TANDEM  
LULT(RT)  
ADJ  
1
2
O
N
SW3  
LUNT(COT) TANDEM  
SW6  
D4 Bank Requirements  
NORM POWER  
O
N
1
2
3
4
5
6
SW4  
NORM  
POWER  
The COT D4 bank must be configured with an OIU-2  
selected for external timing. The COT bank must be  
provided with an external composite clock  
synchronized with the network.  
SW1  
Figure 5. SW1, SW3, and SW6 Labeling  
4
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Table 1. SW1, SW3, and SW6 Option Settings  
Switch  
Label  
TRM  
Function  
Bank Type Selection  
Description  
Selects the bank type for the U-BR1TE V.  
SW1-1  
SW1-2  
TRM  
Bank  
Count/Slot  
SW1-1 SW1-2  
D4  
D4 Counting  
D1D Counting  
On  
On  
Off  
On  
SLC I  
CU in slots 1, 4, 7, 10  
CU in slots 2, 5, 8, 11  
On  
Off  
On  
Off  
SLC III  
D4 Counting  
D1D Counting  
On  
Off  
On  
On  
SW1-3  
SW1-4  
SW1-5  
B1  
B2  
D
Service Level Selection  
Selects the service level. The U-BR1TE V may be optioned to deliver full ISDN  
(2B+D) or any of the following levels of service.  
Service  
Option  
SW1-3  
(B1)  
SW1-4  
(B2)  
SW1-5  
(D)  
Type  
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  
Leased (128 kbps)  
ISDN/DDS  
ISDN  
B1+D  
B2+D  
B1  
DDS/Leased  
Leased  
B2  
ISDN  
D
SW1-6  
Zero Byte Substitution  
In 2B+D, B1+D, or B2+D the ZBS option must be set the same for the COT and  
RT. SW1-6 should be set toward "ZBS EN" 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.  
On  
Off  
ZBS DIS  
ZBS EN  
Disables ZBS  
Enables ZBS  
SW3-1  
Termination Mode  
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.  
On  
Off  
LULT (RT)  
LULT Mode (RT typical)  
LUNT (COT) LUNT Mode (COT typical)  
(See Figure 6)  
SW3-2  
Function dependent upon SW3-1  
setting.  
On  
Off  
ADJ  
TANDEM  
LULT Mode (SW3-1 On)  
DC sealing current provided  
DC sealing current not provided  
In the LULT(RT) mode, SW3-2 controls sealing current. When used in an  
Adjacent-to-Customer configuration, sealing current should be provided (SW3-2  
On). In a Tandem Office Source configuration, sealing current is not required, and  
should be disabled (SW3-2 Off ).  
On  
ADJ  
LUNT Mode (SW3-1 Off)  
In the LUNT(COT) mode, SW3-2 controls periodic wake-up tone. Periodic wake-  
Off  
TANDEM  
Periodic wake-up tone not provided up tones should be disabled when located in an Adjacent-to-Switch location (SW3-2  
Periodic wake-up tone provided  
On). Periodic wake-up tones are required (SW3-2 Off ) when located in a Tandem  
Office Sink configuration, or when adjacent to a device requiring wake-up tones,  
such as a Newbridge switch.  
SW6  
On  
POWER  
NORM  
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.  
Supply a constant -120 Vdc to power an ADTRAN IDSL OCU-R.  
Off  
Normal  
No powering provided toward the customer U-interface.  
Note: Power option should only be used in the LULT (RT) configuration.  
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Figure 6 displays the position switch settings at  
network locations.  
The NORM/PTRN DIP Switch is recessed to prevent  
inadvertent operation. The ten-position rotary switch  
is used to determine the specific test that will be  
performed, including downstream loopbacks  
(see Table 2).  
Front Panel Features  
The U-BR1TE V front panel features a two position  
DIP switch, a recessed pushbutton, a rotary switch, a  
bantam jack, and LEDs, as illustrated in Figure 1.  
The B1/B2 DIP Switch selects the desired bearer  
channel, B1 or B2, to be tested during local tests  
using the U-BR1TE V front panel.  
LED indicators display current status of the unit, as  
listed in Table 3.  
D4/SLC-96  
COT  
D4/SLC-96  
RT  
2-Wire  
Loop  
2-Wire  
2-Wire  
L
L
T1  
U
N
T
ISDN  
RP  
U
L
T
Customer  
NT1  
Channel  
Bank  
Channel  
Bank  
Adjacent to  
Switch  
Adjacent to  
Customer  
SW3  
1 - LUNT (COT)  
2 - ADJ  
SW3  
1 - LULT (RT)  
2 - ADJ  
SW6  
SW6  
Norm  
Power  
D4/SLC-96  
RT  
D4/SLC- 96  
COT  
2-Wire  
2-Wire  
L
U
N
T
T1  
L
U
L
T
Customer  
NT1  
ISDN  
Switch  
Note:  
Channel  
Bank  
Channel  
Bank  
Refer to Table 1 for switch  
function descriptions.  
Adjacent to  
Switch  
Adjacent to  
Customer  
SW3  
1 - LUNT (COT)  
2 - ADJ  
SW3  
1 - LULT (RT)  
2 - ADJ  
SW6  
SW6  
Norm  
Norm  
D4  
D4  
D4/SLC-96  
RT  
D4/SLC-96  
COT  
2-Wire  
2-Wire  
L
2-Wire  
L
U
N
T
L
U
L
T
L
T1  
T1  
U
N
T
U
L
T
Customer  
NT1  
Channel  
Bank  
Channel  
Bank  
Channel  
Bank  
Channel  
Bank  
Adjacent to  
Switch  
Tandem Office  
(Source)  
Tandem Office (Sink)  
Adjacent to Customer  
SW3  
SW3  
SW3  
SW3  
1 - LUNT (COT)  
2 - ADJ  
1 - LUNT (COT)  
2 - TANDEM  
1 - LULT (RT)  
2 - TANDEM  
1 - LULT (RT)  
2 - ADJ  
SW6  
SW6  
SW6  
SW6  
Norm  
Norm  
Norm  
Norm  
Figure 6. Position Switch Settings at Network Locations for ISDN Applications  
6
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Table 2. Rotary Switch Options  
3. TESTING  
The U-BR1TE V responds to embedded operation  
channel loopbacks, including B1, B2, and 2B+D, when  
configured for D channel operation. When used in B1  
configuration (non-D channel modes of operation) the  
U-BR1TE V will respond to an in-band DS0 DP  
latching loopback sequence. When remote testing is  
not available, or during isolation of trouble or  
equipment malfunction, the U-BR1TE V front panel  
provides local test capabilities. Using the internal  
2047 pseudorandom test pattern generator or the  
bantam jacks allows craft personnel to test in both the  
downstream and upstream directions, including  
loopback for 6 addressable ISDN devices and the  
customer’s NT1.  
Display  
AD1  
AD2  
AD3  
AD4  
AD5  
AD6  
Interpertation  
Address #1, address of this unit  
Address #2, the next downstream unit away  
Address #3, the second unit downstream  
Address #4, the third unit downstream  
Address #5, the fourth unit downstream  
Address #6, the fifth unit downstream  
LPBK  
Loopback, forces this unit to loopback the  
selected B1 or B2 channel. Loopbacks occur in  
both the customer and network directions.  
CRTX  
LPTX  
NT1  
Carrier transmit, in the carrier direction  
Loop transmit, in the loop direction  
NT1, address of the NT1  
Latching OCU in DDS mode  
Table 3. LED Indication  
Description  
Indicator  
Color  
Loop Status (LP)  
Off  
Indicates loop synchronization has been established and no Near End  
Block Errors (NEBE) are being received from the Loop interface.  
Red  
Illuminated when U-interface is out of sync or has a loss of signal.  
Yellow  
Flashes yellow upon receipt of a NEBE. During Local Performance  
Monitoring (see Testing) will flash yellow when BER >10-6 is  
detected and illuminate yellow when a BER > 10-5 is detected.  
Carrier Status (CR)  
Off  
Indicates carrier synchronization (framing per TR-TSY-000397) has  
been established and no Near End Block Errors (NEBE) are being  
received from the Carrier interface.  
Red  
Illuminated when no framing pattern is received.  
Yellow  
Flashes yellow upon receipt of a NEBE. During Local Performance  
Monitoring (see TESTING) will flash when a BER > 10-6 is detected and  
illuminate yellow when a BER > 10-5 is detected.  
Activation (ACT)  
Test (TST)  
Green  
Yellow  
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.  
ISDN Application - Once per second indicates that the ACT bit is being  
sent in one direction only.  
Solid yellow when a front panel test has been successfully initiated or  
when responding to a 2B+D loopback request.  
Flashes yellow once every two seconds when responding to a B1  
loopback request or when forced into a B1 loopback from the front  
panel.  
Flashes yellow twice every two seconds when responding to a B2  
loopback request or when forced into a B2 loopback from the front  
panel.  
Green  
Red  
Solid Green when in Local Preformance Monitoring or when the local  
test pattern gen/det is invoked.  
Error (ERR)  
Flashes red when errors are seen by local test pattern detector.  
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The front panel bantam jacks accommodate standard  
DS0 Logic Testers such as the TPI 108/109 RT II or  
FIREBERD 4000/6000 which perform both the  
upstream and downstream testing.  
7. To deactivate the loopback, depress the TEST  
pushbutton for two seconds, until the GREEN  
TEST LED is extinguished, or select NORM on  
the NORM/PTRN DIP switch.  
To initiate a loopback at any data rate when using an  
external DS0 digital test set, perform the following:  
NOTE  
On DDS circuits the internal 2047 Pattern  
Generator on the U-BR1TE V should be used  
only when the service is operating at 64 kbps. If  
DDS service is operating at 56 kbps or less, the  
U-BR1TE V will display errors if the internal  
2047 Pattern Generator is used. The use of  
external DDS test equipment is required for all  
data rates at 56 kbps and below.  
1. Insert the TX and RX bantam plug of the DS0  
digital test set into the U-BR1TE V respective  
front panel bantam jacks. Connect the clock  
input of the DS0 digital test set to the channel  
bank’s clock source (the D4 OIU, or the SLC-96  
SSU). Configure the test set for Near Logic and  
64 kbps.  
2. Select the desired loopback address using the ten-  
position rotary switch. See Table 2.  
Loopback Tests (ADR1 - ADR6, NT1)  
Loopbacks in the Network-to-Customer direction can  
be initiated from either the ISDN switch or the front  
panel. Either the internal 2047 test pattern or a DS0  
digital test set provide the 64 kbps test pattern to be  
tested in B1 or B2. When initiating loopbacks from  
the U-BR1TE V front panel, the downstream direction  
is automatically selected based on the card position in  
the network.  
3. Select the desired bearer channel using the B1/B2  
DIP switch.  
4. Depress the recessed TEST pushbutton to initiate  
the test. The TEST LED will illuminate  
YELLOW when the loopback is established to  
the selected address. If the selected address does  
not respond, the TEST LED will remain off.  
Observe the DS0 digital test set for bit errors.  
5. Tests to additional network addresses may be  
performed by changing the selector knob to the  
desired address. It is not necessary to exit the test  
mode to select a new address.  
To initiate a loopback using the internal 2047 test  
pattern, perform the following:  
1. Select the desired loopback address using the ten-  
position rotary switch. See Table 2.  
6. To deactivate the loopback, depress the TEST  
pushbutton or remove the transmit bantam plug.  
Upon deactivation of the test, the TEST LED will  
go out.  
2. Select the desired bearer channel using the B1/B2  
DIP switch.  
3. Select PTRN on the NORM/PTRN DIP switch.  
4. Depress the recessed TEST pushbutton to initiate  
the test. The TEST LED will illuminate GREEN  
when the loopback is established to the selected  
address, and the ERR LED should go out  
following synchronization to the test pattern. If  
the selected address does not respond, the TEST  
LED will remain out and the ERR LED will  
illuminate.  
Point-to-Point Test (CRTX, LPTX)  
A point-to-point (straight-away) test can be performed  
to either the U-interface (LPTX) or the T-1 carrier  
interface (CRTX). In both cases, either the internal  
2047 test pattern generator or a DS0 DP digital test set  
is used to verify the performance of the selected  
bearer channel.  
5. To insert one bit error, momentarily (for less  
than two seconds) depress the TEST pushbutton.  
The ERR LED should flash upon receipt of the  
injected error.  
To initiate a point-to-point test using the internal 2047  
test pattern, perform the following:  
1. Select the desired test direction, LPTX or CRTX,  
using the ten-position rotary switch. See Table 2.  
6. Tests to additional network addresses may be  
performed by changing the selector knob to the  
desired address. It is not necessary to exit the test  
mode to select a new address.  
2. Select the desired bearer channel using the B1/B2  
DIP switch.  
3. Select PTRN on the NORM/PTRN DIP switch.  
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Section 61104020L4-5, Issue 3  
61104020L4-5C  
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4. Depress the recessed TEST pushbutton to initiate  
the test. The TEST LED will illuminate GREEN  
and the ERR LED should go out following  
synchronization to the test pattern from the far  
end.  
Local Loopback (LPBK)  
A bilateral loopback can be initiated from the  
U-BR1TE V front panel for either bearer channel. A  
local test pattern source is not required for this test.  
To initiate a local loopback, perform the following:  
5. If the far end unit is a U-BR1TE V using the  
internal 2047 test pattern, perform steps 1  
through 4, choosing the same front panel switch  
setting. If the far end is a test set, ensure it is  
configured for a 2047 test pattern.  
1. Select the desired bearer channel using the B1/B2  
DIP switch.  
2. Select LPBK using the ten-position rotary switch.  
See Table 2.  
3. Depress the recessed TEST pushbutton to initiate  
the test. The TEST LED will illuminate  
YELLOW.  
6. To insert one bit error, momentarily (for less than  
two seconds) depress the TEST pushbutton. Bit  
errors will be seen at the far end test unit.  
4. To deactivate the loopback, depress the TEST  
pushbutton. Upon deactivation of the test, the  
TEST LED will go out.  
7. To deactivate the loopback, depress the TEST  
pushbutton for two seconds, until the GREEN  
TEST LED is extinguished, or select NORM on  
the NORM/PTRN DIP switch. Upon deactivation  
of the test, the TEST LED will go out.  
Local Performance Monitoring  
Performance Monitoring of the local T1 carrier system  
and 2-wire U-interface of the ISDN data can be  
performed from the front panel without interruption of  
service to the customer. For this test, bearer channel  
selection is not applicable and a test pattern source is  
not required. To initiate a local performance  
monitoring session, perform the following:  
To initiate a point-to-point test using an external DS0  
digital test set, perform the following:  
1. Insert the TX and RX bantam plug of the DS0  
digital test set into the U-BR1TE V respective  
front panel bantam jacks. Connect the clock  
input of the DS0 digital test set to the channel  
banks clock source (D4’s OIU, or the SLC-96  
SSU). Configure the test set for Near Logic and  
64 kbps.  
1. Ensure the NORM/PTRN DIP switch is in the  
NORM position, and that a bantam plug is NOT  
installed in the front panel TX bantam jack.  
2. Select ADR1 using the ten-position rotary switch.  
2. Select the desired test direction, LPTX or CRTX,  
using the ten-position rotary switch. Refer to  
Table 2.  
3. Depress the recessed TEST pushbutton to initiate  
the test. The TEST LED will illuminate GREEN.  
4. The total number of Near End Block Errors  
(NEBE) received are simultaneously displayed as  
crc errors with the LP and CR CRC status LEDs.  
(See Table 3).  
3. Select the desired bearer channel using the B1/B2  
DIP switch.  
4. Depress the recessed TEST pushbutton to initiate  
the test. The TEST LED will illuminate  
YELLOW.  
5. To exit local performance monitoring, depress  
the TEST button for two seconds or longer.  
Upon deactivation of the test, the TEST LED will  
go out.  
5. If the far end unit is a U-BR1TE V using a DS0  
digital test set, perform steps 1 through 4,  
choosing the same front panel switch setting.  
Ensure that both test sets are configured for the  
same test pattern (511, 2047). If the far end unit  
is a U-BR1TE V using the internal 2047 test  
pattern, perform steps 1 through 4 of the previous  
section.  
6. Observe the DS0 digital test set for bit errors.  
7. To deactivate the loopback, depress the TEST  
pushbutton, or remove the transmit bantam plug.  
Upon deactivation of the test, the TEST LED will  
go out.  
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61104020L4-5C  
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IDSL/DDS Description  
DDS Testing  
The U-BR1TE V may be deployed in the adjacent to  
customer position 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 of mixed gauge wire. The  
IDSL OCU-R is used to terminate the U-interface at  
the customer’s premises provided by the U-BR1TE V  
and to convert the 2-wire ISDN signal to a 4-wire  
AMI DDS signal for presentation to the customer.  
Together, the U-BR1TE V and IDSL OCU-R allow  
testing over the ISDN transport network to be  
performed with traditional DDS methods. In this  
mode U-BR1TE Vs may be placed in tandem and  
function as DS0 DPs while the IDSL OCU-R  
functions as an OCU. See Figure 7 for various  
U-BR1TE V DDS arrangements.  
For leased mode or DDS applications with the  
U-BR1TE V 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 V responds to latching loopback sequences  
for the DS0 DP. The U-BR1TE V allows the OCU  
loopback command to pass in-band downstream to the  
IDSL OCU-R.  
Upon receipt of a DS0 DP latching loopback sequence  
the U-BR1TE V initiates a bilateral loopback for the  
B1 channel. This bilateral loopback allows testing of  
the 2B1Q local loop to the IDSL OCU-R  
simultaneously with network testing to the U-BR1TE  
V.  
SLC 96  
4W  
Digital  
A
B
C
2-Wire  
Local  
Loop  
D
E
4W DS0 DP  
4W DS0 DP  
4W DS0 DP  
T1  
Customer  
Premises  
or  
DCS  
T1  
U-BR1TE  
1B  
RT  
or  
OCU  
IDSL OCU-R  
or  
DCS  
1
D4/DCS  
COT/DCS  
D4  
SW3  
1 - LULT (RT)  
2 - ADJ  
SW6  
Power  
Non-ADTRAN U-BR1TE 1B+D  
A
2-Wire  
Local  
Loop  
2W  
Digital  
B
C
D
E
4W DS0 DP  
T1  
U-BR1TE  
1B  
U-BR1TE  
1B+D  
or  
OCU  
T1  
Customer  
Premises  
U-BR1TE  
1B+D  
RT  
IDSL OCU-R  
2
3
D4  
COT  
D4  
SW3  
1 - LULT (RT)  
2 - TANDEM  
SW6  
Normal  
4W  
Digital  
A
B
C
2-Wire  
Local  
Loop  
D
E
4W DS0 DP  
4W DS0 DP  
4W DS0 DP  
T1  
or  
OCU  
T1  
or  
DCS  
or  
DCS  
Customer  
Premises  
U-BR1TE  
1B  
IDSL OCU-R  
D4  
D4  
D4  
D4  
SW3  
1 - LULT (RT)  
2 - ADJ  
Equipment Requirements  
1 D & 3 D: Must be 1104020L4 w/ power enabled  
SW6  
Power  
2
2
B: Must be 1104020L4 w/ Power Disabled  
E: Requires local AC power  
NOTE: Refer to Table 1 for DIP switch function  
descriptions.  
Figure 7. U-BR1TE V IDSL/DDS Circuit Diagram  
10  
Section 61104020L4-5, Issue 3  
61104020L4-5C  
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The following data sequence enables the DS0 DP,  
OCU, and CSU latching loopbacks:  
DS0 DP Loopback EOC Remapping  
Upon receipt of subsequent DS0 DP loopback codes  
when the D channel is disabled, the U-BR1TE V  
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 8.  
1. Minimum of 35 transition in progress (TIP)  
bytes (X0111010).  
2. Minimum of 35 loopback select code (LSC)  
bytes: DS0 DP (X0000101),OCU  
(X1010101), CSU (X0110001).  
3. Minimum of 100 loopback enable (LBE) bytes  
(X1010110).  
4. Minimum of 32 far-end voice (FEV) bytes  
(X1011010).  
Test  
Head  
X Denotes Don’t Care bit - either a 1 or a 0.  
If the U-interface of the U-BR1TE V is not in sync,  
the unit transmits MUX-Out-of-Sync (X0011010).  
D4/SLC-96  
T1  
ISDN  
RPTR  
IDSL  
OCU-R  
U-BR1TE  
1B+D  
U-BR1TE  
1B  
OCU  
DS0 DP #1  
DS0 DP #3  
DS0 DP #2  
Disabling DS0 DP, OCU, or CSU latching loopback  
sequence:  
Loopback Response  
Figure 8. IDSL/DDS Loopback Response  
1. Minimum of 35 TIP bytes.  
or by pressing the front panel loopback button.  
NOTE  
Front Panel Tests  
For DDS circuits with the D channel disabled,  
all tandem U-BR1TE elements should be  
ADTRAN U-BR1TE Vs with DDS Loopback  
Capability for remote end test operation to  
function properly. See 2B in Figure 7. In D  
channel disabled applications, older non-DDS  
vintage U-BRITEs may not pass the OCU  
latchingloopbacksequencetotheIDSL OCU-R.  
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.  
All active in-band loopbacks may be disabled by  
pressing the front panel loopback button once when a  
test set is not connected to the bantam jacks.  
Upon receipt of an OCU latching loopback sequence  
the U-BR1TE V passes the OCU sequence in-band  
downstream to the IDSL OCU-R. U-BR1TE Vs do  
not respond to the CSU latching loopback command  
but simultaneously pass 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  
Initiate Loopback at IDSL OCU-R  
When used for DDS, the D4 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 SW2. To invoke  
the OCU loopback at the IDSL OCU-R, press the Test  
button with the front panel test knob in the NT1  
address location.  
loopback upon receipt of the CSU latching loopback.  
11  
Section 61104020L4-5, Issue 3  
61104020L4-5C  
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Performance Monitoring  
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.  
Local Performance Monitoring is available only for  
the U-interface, when configured for a leased mode of  
operation. See the subsections entitled Loopback  
Tests, Point-to-Point Test, and Local Loopback for  
applicable test descriptions.  
The U-BR1TE responds to a loopback command  
initiated at the OCU-R as follows:  
ADTRAN U-BR1TE Bidirectional Loopback  
In LULT Mode, the ADTRAN U-BR1TE will execute  
a bidirectional loopback when performing DS0 DP  
loopback. See Figure 9 for an illustration of the  
bidirectional loopback.  
Pressing the OCU-R LBK pushbutton on the OCU-R  
once will initiate a loopback at the U-BR1TE toward  
the customer. See Figure 10. This allows data to be  
sent from the remote end to test the local loop and the  
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.  
Remote End Initiated LBK Tests  
The U-BR1TE supports loopbacks generated from the  
remote unit which allows testing to be performed  
Pressing the OCU-R LBK pushbutton a second time  
will initiate a loopback at the OCU-R toward the  
4-wire DDS (CPE) interface. A solid CUST LBK  
LED on the IDSL OCU-R indicates a loopback at the  
IDSL OCU-R toward the customer equipment.  
See Figure 11. Pressing the OCU-R LBK pushbutton  
a third time disables all current latching loopbacks  
initiated by the OCU-R LBK pushbutton.  
ADTRAN U-BR1TE  
IDSL OCU-R  
Test Set  
Bidirectional  
loopback  
If errors exist the loopbacks can help determine the  
source; either the local loop or the OCU-R.  
Figure 9. ADTRAN U-BR1TE Bidirectional  
Loopback  
4-Wire  
CPE Interface  
OCU-R  
Loopback  
ASC 9Eh  
U-BR1TE  
Test  
Set  
Local Loop  
Pushbutton  
Push once for  
U-BR1TE Loopback  
Figure 10. IDSL/DDS Remote End Initiated Loopback, Local Loop  
4-Wire  
CPE Interface  
ASC 9Eh  
OCU-R  
ASC 9Eh  
Test  
Set  
U-BR1TE  
Loopback  
Local Loop  
Pushbutton  
Push twice for  
OCU-R Loopback  
Figure 11. IDSL/DDS Remote End Initiated Loopback, Customer Loop  
12  
Section 61104020L4-5, Issue 3  
61104020L4-5C  
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During a remote end initiated loopback the system  
transmits ASC 9Eh toward the network, indicating an  
out-of-service condition generated by the remote end,  
as shown in Figures 10 and 11.  
2B Leased Mode Operation  
The U-BR1TE V is deployed in 2B leased line  
operation to provide DDS/Frame Relay services to  
ISDN equipment. By using the 2-wire ISDN interface  
for 128 kbps data rate, the U-BR1TE V Leased Mode  
Operation allows pair savings over traditional DDS  
deployment. DDS/Frame Relay support allows  
loopback testing to be performed across the ISDN  
transport system in this configuration.  
All IDSL/DDS system latching loopbacks, whether  
initiated by the IDSL DCU-R craft interface, LBK  
pushbutton, CO, or from a remote Test Center, can be  
released by sending 35 DDS loop down TIP bytes  
<X0111010> (Where X is a “don’t care” bit). All  
existing latching loopbacks will also be disabled by  
pressing the LBK pushbutton on the CO or remote  
unit.  
The U-BR1TE V will decode DDS latching loopback  
sequences coming from the carrier into eoc loopback  
commands usable by traditional ISDN equipment. See  
Figure 13 for various U-BR1TE V DDS 2B Leased  
Mode arrangements. In a SLC-96 network the  
U-BR1TE V units will operate in both 2B+D or 2B  
mode. Both units must be in the same mode.  
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.  
Loopback Operation  
To enable detection of DDS latching loopbacks, the  
ADTRAN U-BR1TE V must be provisioned as an  
LT- like device in leased 128 kbps (2B) mode of  
operation.  
IDSL/DDS Trouble Code  
When B1 and B2 are enabled, data on both channels  
are looped in response to a DDS latching loopback  
sequence detected on channel B1. The U-BR1TE V  
will respond to a DS0 latching loopback intended for  
DS0 #1. Loopback commands intended for DS0 #2  
and greater are re-mapped to ISDN eoc loopback  
commands addressed to the appropriate unit.  
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 U-BR1TE V transmits a  
MUX-Out-of-Sync trouble code (MOS 9Ah) into the  
network as shown in Figure 12. During a similar  
out-of-service condition at the customer premises, the  
IDSL OCU-R transmits Abnormal Station Code  
(ASC 9Eh) upstream toward the network as shown in  
Figure 12.  
The U-BR1TE V will map a CSU latching loopback  
sequence to an ISDN eoc NT1 loopback. Figure 13  
shows the DDS latching loopback commands that will  
loop each unit.  
NOTE  
Only the B1 channel will detect the DDS  
loopback sequences for activation and  
deactivation of DS0 and CSU latching  
loopbacks.AllstandardU-BR1TEunitsbetween  
the ADTRAN U-BR1TE V and the NT1 device  
must have the D-channel enabled in order for  
loopbacks to be processed beyond the  
U-BR1TE V.  
Channel Bank  
Customer Premises  
Open 2-wire Loop  
MOS 9Ah  
U-BR1TE  
IV  
IDSL OCU-R  
DSU  
Channel Bank  
Customer Premises  
Open 4-Wire Customer  
Interface  
ASC 9Eh  
ASC 9Eh  
U-BR1TE  
IV  
IDSL OCU-R  
DSU  
Figure 12. IDSL/DDS Trouble Codes  
13  
Section 61104020L4-5, Issue 3  
61104020L4-5C  
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4. MAINTENANCE  
The ADTRAN U-BR1TE V does not require routine  
maintenance for normal operation.  
ADTRAN Sales  
Pricing/Availability  
(800) 827-0807  
ADTRAN Technical Support  
Pre-sales Applications/Post-sales Technical  
Assistance  
5. WARRANTY AND CUSTOMER SERVICE  
ADTRAN will replace or repair this product within ten  
(10) years from the date of shipment if it does not meet  
its published specifications or fails while in service.  
Refer to ADTRAN U.S. and Canada Carrier Networks  
Equipment Warranty, document 60000087-10.  
(800) 726-8663  
Standard hours: Monday-Friday, 7 a.m. - 7 p.m. CST  
Emergency hours: 7 days/week, 24 hours/day  
Contact Customer and Product Service (CAPS) prior to  
returning equipment to ADTRAN.  
ADTRAN Repair/CAPS  
Return for Repair/Upgrade  
(256) 963-8722  
For service, CAPS requests, or further information,  
contact one of the following numbers:  
Repair and Return Address  
ADTRAN, Inc.  
CAPS Department  
901 Explorer Boulevard  
Huntsville, Alabama 35806-2807  
D4 Channel Bank  
NT 1  
or  
TA  
T1  
U-BR1TE V  
2B  
DS0 DP #1  
SW 3  
CSU  
1 - LULT  
2 - ADJ  
SW 6  
NORMAL  
DLC Application  
D4 Channel Bank  
COT  
RT  
NT 1  
or  
TA  
T1  
T1  
U-BR1TE  
2B + D  
U-BR1TE  
2B + D  
U-BR1TE V  
2B  
DS0 DP #1  
SW 3  
1 - LULT  
2 - TANDEM  
SW 6  
DSO DP #2  
DSO DP #3  
CSU  
U-BR1TE (Non-ADTRAN)  
NORMAL  
SLC-96  
D4 Channel Bank  
U-BR1TE V  
U-BR1TE V  
D4/SLC-96  
COT  
2B + D  
or  
D4/SLC-96  
NT 1  
or  
TA  
T1  
T1  
RT  
2B + D  
or  
LULT  
LUNT  
LULT  
2B  
2B  
2B  
DS0 DP #1  
DSO DP #2  
SW 3  
DSO DP #3  
CSU  
SW 3  
SW 3  
1 - LULT  
2 - TANDEM  
SW 6  
1 - LUNT  
2 - TANDEM  
SW 6  
1 - LULT  
2 - ADJ  
SW 6  
NORMAL  
NORMAL  
NORMAL  
Figure 13. DS0 Latching Loopback  
14  
Section 61104020L4-5, Issue 3  
61104020L4-5C  
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