Avaya 03-300430 User Manual

 

 

 
 

 

 

5

Slips on

Reference

Facilities?

 Is there a

loss-of-signal or

network alarm

Yes

Yes

No

No

Many

Are there

 

many facilities

with excessive slips?

 

Few

 

 

7

 

 

Escalate, if the

problem is not fixed.

6

B

D

6

C

Perform the following to try and affect the 
symptoms:

If duplicated:

- Switch tone clocks

Replace circuit packs:

- IPSI/Tone Clock in the timing master PN.
- DS1 in timing master PN

Are all the facilities 
with slips from the 
same external 
source, i.e. 
Network Service 
Provider or other 
switching vehicle?

No

Yes

Contact the distant end service provider of the 
facilities with slips to troubleshoot. 
If the distant end is another PBX, verify that one 
switch is the master and the other is a slave. If 
both think they are the master it will cause slips on 
all spans between them.

To Fig 4

Check the overall timing network to 
verify the source is traceable back to
the same high stratum level source.
(This does not apply when

Fix any DS1-BD and UDS1-BD

problems present in the system.

Verify that one end of a slipping span 
is administered to be the master and the
other is administered to be the slave.

Consider using the facility fault 
sectionalization techniques to isolate
the problem. Use slip counts as a
pass/fail indication.

E

A tone clock is acting as the timing
reference and it was switched to from
a higher (primary or secondary) 
reference. The primary and, if administered

Work with the service provider (or distant

administration of line coding, frame
formats, etc.

slips are only on tie trunk facilities)

switch, if applicable) to compare

secondary reference must be restored before
troubleshooting may continue on other spans. 

See the DS1-BD and 
UDS1-BD MOs to resolve
any outstanding alarms.
Investigate external causes
for the loss of the primary 
and/or secondary reference.
Change interface boards as
a last resort.

From
Fig 2

From
Fig 1

From
Fig 1

on the DS1 references?

If the distant end is another PBX, verify 
that one switch is the master and the
other is a slave. If both think they are the 
master it will cause slips on all spans 
between them. 

12