Tests Initiated From Norstar; Tests Initiated By The Central Office - Nortel ICS Install Manual

570 / Tests
The continuity loopback test shorts the tip and ring pair of the
receive signal path with the transmit signal path. This test
allows you to check the metallic continuity of the external
wiring.

Tests initiated from Norstar

You can start and stop Loopback tests in Maintenance
programming under the heading Loopback tests. You can
also push a button on the DTI faceplate to start and stop the
continuity test.
You can run DTE and DS30 Loopback tests to verify the SDI
data transfer capabilities. Under the Hardware heading,
ensure that the Type setting for data module is SDI before
choosing the Loopback test you will run.

Tests initiated by the central office

If the internal CSU is administered on line loopback and
payload loopback tests can also be invoked and stopped by the
central office. In order to be able to run a payload loopback
test, the DTI must be configured for extended superframe
format.
Modular ICS 7.1 Installer Guide N0130943 02