Demand test descriptions and error codes - Avaya Support

6. Check for LOS, Blue, Yellow, and Red alarms on the on-line reference facility, and fix those
problems first. Check for slips, misframes, minor and major error rates and fix those
problems next. See the DS1-BD and/or UDS1-BD for the error log entries associated with
the previously mentioned alarms. Replace the circuit packs one at a time and wait at least
1 hour to determine if the problem went away. This procedure is disruptive and should be
done after hours if possible.
If problems persist it may be useful to compare translations for line coding and frame
formats with the far end service provider. Make sure the translations match.
If high or critical reliability switch the Port Network Connectivity (PNC) to try and help
isolate the problem.
Instead of replacing the Tone-Clock circuit pack in systems where Tone-Clocks are
duplicated, run set tone-clock to interchange Tone-Clocks. If the problem goes away,
replace the previously active Tone-Clock.
7. If a few facilities experience slips or are unusable references, the clock source for facilities
with slips or that are unusable is not traceable to the same ultimate source as the clock
source for the on-line reference facility.
Examine the overall timing network for the interconnected DS1 to determine if the:
● Clock can be traced back to a single source.
● Reference designations for each location in the distribution of timing is supplied in
accordance with a synchronization plan.
Examine the capability of the external transmission equipment to pass or provide timing.
Verify the integrity of the on-site hardware by using Facility Fault Sectionalization. This:
● Loops the transmit signal to the receive signal.
● Verifies that the excessive slips or the unusable reference are no longer observed.
This is a time-consuming process that disrupts service. Perform it after hours if the service
provided by the system is acceptable as determined by the customer.
8. For a high- or critical-reliability (duplex) system, use set tone-clock to interchange
IPSI circuit packs’ Tone-Clock circuits or Tone Clock circuit packs, as applicable. If slips go
away, replace the previously active Tone-Clock or IPSI circuit pack.
For a standard reliability (simplex) system, change the tone clock.
9. Use list fiber-links to determine the EIs on the active PN and the EIs associated
with the slave PN. If the switch does not have duplication, the EIs are all on the active PN.
910 Maintenance Alarms for Communication Manager, Media Gateways and Servers