Instruction manual

Maintenance
Slips (BRI SLIPS > 88)
A slip occurs when there is the loss of a frame because of clock synchronization.
When the slips (negative plus positive) count is greater than 88, a transient error
occurs. Once the error is logged, every 15 minutes the slips count is scanned
and totaled. Also, every 15 minutes the count is decreased by 10. For example,
if 15 slips occur during the 15-minute interval, the transient count increases by a
net of 5 (15 slips counted minus 10). The transient alarm condition is
automatically removed from the transient error log when the slip counter value
decreases to 0.
Central Office-Induced Errors
The 5ESS central office (CO) deliberately sends or receives incorrect information
to test the transmission paths between the CO and the MERLIN LEGEND
system.
Network-Requested Corrupted CRCs
(BRI NET REQUESTED CCRCs
In this error condition, the CO requests that the 800 CO-BRI module send bad
CRCs in the frames. The errors are transient and are listed in the transient error
log. When the condition returns to normal operation, the maintenance software
clears this error from the log.
Network Deactivation (BRI NET DEACTIVATE)
If the deactivation bit in a transmission is set to zero by the CO, the transceiver in
the 800 CO-BRI module deactivates Layer 1 on a DSL. The red LED on the BRI
module lights, and the condition is logged as a permanent error. Maintenance
software takes the facilities affected out of service. When the condition returns to
normal operation, the red LED goes off, the error log entry is removed, and the
facilities are put back into service.
Network-Invoked 2B+D Loopback Activation
(BRI NET INV 2B+D LB ACT)
The 2B+D Ioopback testis invoked by the CO at installation to verify error-free
transmission. When the MERLIN LEGEND system receives this request from the
CO, the maintenance software turns on the red LED on the 800 CO-BRI module,
logs the condition as a permanent error, and takes the affected facilities out of
service. When the condition returns to normal operation, the red LED goes off,
the error log entry is removed, and the facilities return to service.
6-20 Error Logs and Error Messages