DS1-BD (DS1 Interface Circuit Pack)
Issue 1 May 2002
8-645
555-233-143
Far CSU Loop-Back Test (#1213)
This test is destructive.
The Far CSU Loopback (R-LLB) test causes a loop back at the far-end CSU and
tests all circuitry and facilities from the local TN767E DS1 board to the far-end
CSU.
The test is destructive and can only be initiated by a technician-demanded
test ds1-loop UUCSS far-csu-loopback-test-begin command.
All trunks or ports on the DS1 Interface circuit pack must be busied out via the
system technician busyout board command before running the Far CSU
Loopback test.
If the far-end CSU is not a 120A CSU module or a 401A T1 sync splitter, and the
DS1 is administered for ami-zcs line coding, one’s density protection must be
disabled on the CSU during the test due to the large number of zero’s in the
3-in-24 test pattern.
The Far CSU Loopback test has the TN767E DS1 Interface circuit pack transmit a
loop-back activation code to the remote CSU, waits up to 15 seconds for return of
the code to verify the loop back has been established, transmits a framed 3-in-24
test pattern, begins counting bit errors in the received test pattern, and returns a
PASS result. If the loop back is not established within the 15 seconds, the test
fails.
The status of the Far CSU Loopback test will be available in the hardware error
log via Error Type #3901. Several distinct aux values will be used to give the user
information of the status of the test.
The list measurements ds1 summary command will display the length of time
the test has been running (
Test Duration
field) and number of bit errors
detected (
Loopback/Span Test Bit-Error Count
field). If the test pattern
is being passed through the loop back cleanly, the number of bit errors should be
very low. The command will also display the type of loop-back/span test
executing (
Test
field), the type of pattern generated for the loop-back/span test
(
Pattern
field), and whether the pattern (i.e., 3-in-24 Pattern) is synchronized
(
Synchronized
field).
To end the test, enter test ds1-loop UUCSS end-loopback/span-test or the
release board command. Using the release board command will restore all
trunks or ports on the TN767E DS1 Interface circuit pack to the in-service state.
Summary of Contents for S8700 Series
Page 50: ...Maintenance Architecture 555 233 143 1 26 Issue 1 May 2002 ...
Page 74: ...Initialization and Recovery 555 233 143 3 12 Issue 1 May 2002 ...
Page 186: ...Alarms Errors and Troubleshooting 555 233 143 4 112 Issue 1 May 2002 ...
Page 232: ...Additional Maintenance Procedures 555 233 143 5 46 Issue 1 May 2002 ...
Page 635: ...status psa Issue 1 May 2002 7 379 555 233 143 status psa See status tti on page 7 406 ...
Page 722: ...Maintenance Commands 555 233 143 7 466 Issue 1 May 2002 ...