Avaya S8700 Maintenance Manual page 939

For multi-connect configurations

Hide thumbs Also See for S8700:

Table of Contents

ATM-EI (Expansion Interface Circuit Pack)

ATM Board Framer Loop-Around Test (#1260)

This test is destructive.

This test can be run on the standby PNC only if the board is busied out.

This test places the ATM circuit pack in ATM framer loop-around mode. Once the

board receives this message, it creates a dummy virtual circuit that originates and

ends on the same board, without leaving the board. This test verifies both the

TDM path and the Packet Path. If the TDM test path passes, then the packet path

is tested. Definitions of each test path are:

— The circuit (TDM) path: one of the Tone Generators sends a bit pattern

through a TDM bus time slot to the ATM framer. The pattern is converted

into ATM cells and looped back to the ATM-EI board, which converts the

cell back into the bit pattern and puts it on a pre-determined time slot. A

Tone Detector tests for the bit pattern and reports the test result. This test

verifies that a large portion of the ATM-EIs circuit paths are functioning

Figure 8-5. ATM Board Framer Loop-Around Test (#1260)

— Packet path: the Packet Interface circuit pack sends packet data to the

ATM framer interface, where it is mapped into ATM cells and then looped

around internally. The cells are converted back to packet data after it has

been looped. This portion of the test verifies correct operation of the

ATM-EI's packet-bus interface and a large portion of the ATM-EI's packet

circuit pack.

shows a diagram of the test.

Tone detector

shows the packet switched signal path for the ATM

iodftone AWF 040699

Issue 1 May 2002

Troubleshooting