Avaya 03-300430 User Manual

This test verifies that a data message can be sent from the PBX, through the building wiring, 
through an internal loop-around path in the data module, and back to the PBX. This path is 
illustrated below.
For this test to run, the Remote Loop-Around Test field on the Data Module administration 
screen must be set to y, indicating that the data module endpoint supports the test.

Note:

: This test aborts with Error Code 1412 on a G700 media gateway.

A signaling message is sent through the digital port circuit pack to the data module, requesting it 
to enter loop-around mode. A test pattern is then sent from the TN771D Maintenance/Test 
circuit pack, over the path illustrated above, and back to the TN771D where it is checked for 
consistency.
The test aborts if any of the following local PBX resources are not available: a digital port on the 
TN771D (there are two such digital ports, but only one may be used at a time), two TDM time 
slots and an idle digital port connected to the data module.

TN771

Maintenance/

Test circuit

pack

TDM

bus

Data module

(MPDM, DA, MTDM)

Data
equipment

Digital

line

circuit

pack

pdmodul2 LJK 072501

Switch