Avaya 03-300430 User Manual

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 

●

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.

10. Replace the circuit packs one at a time, and wait at least 1 hour to determine if the problem 

has gone away. This procedure is disruptive and should be done after hours if possible.

Instead of replacing the EI and SNI in systems where the PNC is duplicated, perform a PNC 
interchange using reset pnc interchange. If the problem goes away, replace either