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Install DS1/T1 CPE loopback jack
Issue 10 June 2005 329
2. Step through Table 62 to troubleshoot.
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
letter, and SS is the slot number of the DS1 board.
Table 62: DS1 Troubleshooting
Condition Solution
The value of the
Test: cpe-loopback-jack field is
Pattern 3-in-24
The loopback jack test is active.
The value of the Synchronized field
is N
Retry the test 5 times.
The value of the Synchronized field
remains N after 5 tries.
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.
The value of the Bit-error count field
is non-zero
Repeat Step 1 several times.
The value of the Synchronized is Y The DS1 circuit pack has synchronized
to the looped 3-in-24 pattern and is
counting bit errors in the pattern.
The value of the Bit-error count field
pegs at 75535 or increments by 100s
or 1000s each time you repeat Step 1.
Suspect loose or corroded connections,
severe crosstalk, or impedance
imbalances between the two conductors
of the receive or transmit pair. Wiring
may need replacement.
The value of the Bit-error count field
is 0
There are no obvious wiring problems.
Verify this by repeating Step 1 at
1-minute 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
8
. If the
test reports no errors for 10 minutes, the
error rate is less than 1 in 10
9
.