Instruction manual

Maintenance
Minor Errors
Near-End Block (CRC) Errors (NEBEs)
When a transceiver on the 800 CO-BRI module receives a superframe that has a
bad CRC error, the condition is called a Near-End Block Error (NEBE). Automatic
maintenance programs scan the NEBE error counter every 15 minutes and clear
it hourly. The total NEBE count is kept for the previous hour and the current hour.
NEBE errors are not permanent or transient errors; therefore, no action is taken.
However, the NEBE count does appear on the maintenance screens.
Far-End Block (CRC) Errors (FEBEs)
When the receiver on the 5ESS central office’s BRI circuit module receives a
superframe that has a bad CRC error from the MERLIN LEGEND’s 800 CO-BRI
module, the error condition is called a Far-End Block Error (FEBE). Automatic
maintenance programs scan the FEBE error counter every 15 minutes and clear
it hourly. The total FEBE count is kept for the previous hour and the current hour.
FEBE errors are not permanent or transient errors; therefore, no action is taken.
However, the FEBE count does appear on the maintenance screens.
Error Messages
Along with alarm indicators, error messages are the best indicators that an error
has occurred in the system. Error messages appear on the displays of the MLX-
20L telephone or the PC used for maintenance (System –› Error Log –› Last 30,
Permanent, or Transient). Table 6-2 lists the error messages and the possible
solutions for each. Because many of the errors are caused by tests invoked by
the CO, the system technician has little to do on the MERLIN LEGEND side.
NOTE:
Routine maintenance tests performed by the CO on BRI lines can result in the
appearance of invalid “BRI errors” as the last 30 errors in your log.
Error Logs and Error Messages 6-23