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DS1-BD (DS1 Interface Circuit Pack)
Issue 4 May 2002 10-675 555-233-123
CPE Loopback Jack Test (#1212)
This test is destructive.
The CPE Loopback Jack (CLJ-LB) Test causes a loopback at the CPE Loopback
Jack and tests the building wiring connection between the TN767E DS1 board
and the CPE Loopback Jack.
The test is highly destructive and can only be initiated by a system technician
demanded test ds1-loop UUCSS cpe-loopback-jack-test-begin
[number-of-bits bit-pattern] command. The System technician has the choice of
entering a loopback activation code on the command line or using the default
code (0x47F).
All trunks or ports on the DS1 Interface circuit pack must be busied out via the
system technician busyout board command before running the CPE Loopback
Jack Test.
The CPE Loopback Jack Test has the TN767E DS1 Interface circuit pack transmit
a loopback activation code to the CPE Loopback Jack, waits up to 10 seconds for
return of the code to verify the loopback 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 to indicate that the pattern was successfully sent. If the
loopback is not established within the 10 seconds, the test returns FAIL.
The status of the CPE Loopback Jack test will be available in the hardware error
log via error type 3900. 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 loopback cleanly, the number of bit errors should be very low. The
command will also display the type of loopback/span test executing (Test field),
the type of pattern generated for the loopback/span test (Pattern field), and
whether the pattern (3-in-24 Pattern) is synchronized (Synchronized Field).
To terminate the test, enter the test ds1-loop UUCSS end-loopback/span-test
command.
Table 10-247. TEST #1212 CPE Loopback Jack Test
Error
Code Test
Result Description/Recommendation
ABORT Internal system error
1. Retry test ds1-loop UUCSS cpe-loopback-jack-test-begin
at 1-minute intervals a maximum of 5 times.
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