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Section 61104020L4-5, Issue 3
61104020L4-5C
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.
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.
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.
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.
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.
2. Select the desired test direction, LPTX or CRTX,
using the ten-position rotary switch. Refer to
Table 2.
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. 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.
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:
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.
4. To deactivate the loopback, depress the TEST
pushbutton. 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:
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.
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).
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.
