Lucent Technologies DEFINITY Installation For Adjuncts And Peripherals page 140

DEFINITY ECS Release 8.2
Installation for Adjuncts and Peripherals 555-233-116
9 DS1/T1 CPE Loopback Jack
Loopback Testing with a Smart Jack
Condition
The value of the Test: cpe-
loopback-jack field is Pattern 3-in-
24
The value of the Synchronized field
is N
The value of the Synchronized field
remains N after 5 tries.
The value of the Bit-error count
field is non-zero
The value of the Synchronized is Y
The value of the Bit-error count
field pegs at 75535 or increments
by 100s or 1000s each time you
repeat step 1.
The value of the Bit-error count
field is 0
3. Once you are fairly certain that the test is reporting no errors (after at least
1 error-free minute), confirm that the 3-in-24 pattern error detector is
operating. Enter
test DS1-loop UUCSS inject-single-bit-error.
where UU is the cabinet number, C is the carrier number, and SS is the
slot number of the DS1 board.
4. Display the bit error count again. At the management terminal, enter
list meas DS1 sum UUCSS
where UU is the cabinet number, C is the carrier number, and SS is the
slot number of the DS1 board.
Solution
The loopback jack test is active.
Retry the test 5 times.
Excessive bit errors are likely. Check for
intermittent connections or broken wires in an SPE
receive or transmit pair, and repair as necessary.
Then repeat step 1.
Repeat step 1 several times.
The DS1 circuit pack has synchronized to the
looped 3-in-24 pattern and is counting bit errors in
the pattern.
Suspect loose or corroded connections, severe
crosstalk, or impedance imbalances between the
two conductors of the receive or transmit pair.
Wiring may need replacement.
There are no obvious wiring problems. Verify this
by repeating step 1 a 1- to 10-minute intervals
until you are certain.
If the test reports no errors for 1 minute, the error
rate is less than 1 in 10
errors for 10 minutes, the error rate is less than 1
9
in 10 .
April 2000
8
. If the test reports no
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