Avaya S8700 - Troubleshooting ISDN-PRI Endpoints (Wideband)

Troubleshooting ISDN-PRI Endpoints (Wideband)
Issue 1 May 2002
4-71555-233-143
Troubleshooting ISDN-PRI Endpoints
(Wideband)
The following flow chart describes a layered approach for troubleshooting
problems with an ISDN-PRI endpoint. Because problems at lower layers affect
upper layers, layers are investigated from low to high. In this procedure, the:
■ DS1 facility is layer 1
■ TN2312 IPSI circuit pack’s Packet Interface circuit is layer 2
■ PRI endpoint’s ports are layer 3
This troubleshooting procedure is limited to diagnosing faults between the switch
and either the ISDN-PRI’s:
■ Line-side terminal adapter
■ Endpoint equipment
Problems encountered on the network side of a wideband connection or problems
with end-to-end equipment compatibility are beyond the scope of this section.
START
Ø
Are there alarms or errors against any of
the following maintenance objects (MOs):
UDS1-BD, PKT-INT, SYS-LINK,
ISDN-LNK, ISDN-SGR, PE-BCHL
YES
→
Resolve those alarms or errors in the order listed
at left by following procedures for the
appropriate MO in Chapter 9.
↓ NO
Check the status of the endpoint
equipment or terminal adaptor. (Do this at
the endpoint, not at the G3-MT.) ↓
Does the adaptor or endpoint indicate
problems?
↓ NO
YES
→
Follow repair procedures recommended by the
provider of the terminal adapter or endpoint
equipment.
Check administration at the endpoint and
on the switch (for example, port boundary
width). Are they inconsistent?
YES
→
Correct the administration so that both ends
match.
↓ NO
Does every call fail, or are the failures
transient?
↓ Transient Failures
Always
Fails
→
Check the health of the application equipment
(for example, the video codec) and that of the
S8700 Multi-Connect network. If constant
failures persist, follow normal escalation
procedures.
Use list measurements ds1 to check for
bit errors over the DS1 interface between
the switch and the terminal adapter or
endpoint equipment.
↓ No bit errors
Bit
Errors
→
Perform an in-depth analysis of the DS1
interface including premises distribution wiring,
endpoint equipment, and any other possible
source of noise. If the problem cannot be
isolated, follow normal escalation procedures.