Adding or Removing Hardware
Install DS1/T1 CPE loopback jack
Installation, Upgrades and Additions for Avaya CMC1 Media Gateways
305
June 2004
3
Zero out the ESF error count. At the management terminal, enter
clear meas ds1 esf UUCSS
,
where
UU
is the cabinet number,
C
is the carrier letter, and
SS
is the slot number of the DS1
board.
Running the data test
1
Display the bit error count. At the management terminal, enter
list meas ds1 sum
UUCSS
, where
UU
is the cabinet number,
C
is the carrier letter, and
SS
is the slot number of the DS1 board.
2
Step through
Table 66
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.
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 letter, and
SS
is the slot number of the DS1
board.
Table 66: 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
.