Paradyne 3160-A2-GB21-50 Test Commands, Remote Loopback Tests, Sending a Line Loopback Up or Down

Maintenance

Test Commands

The test commands enable you to run loopbacks and test patterns on the DSU/CSU, and to test the front panel LEDs. These tests can help you isolate areas of trouble if you are having problems with your DSU/CSU.

To access all Test commands from the Test branch, press F2 to select Test from the top-level menu screen.

DSU ESF

Stat Test Cnfig

F1 F2 F3

Remote Loopback Tests

The Remote Loopback tests enable you to troubleshoot your circuit by sending the following to a far-end device:

For Networks

•Line loopback up activation sequence for 10 seconds (LLBUP)

•Line loopback down activation sequence for 10 seconds (LLBDN)

For Channels

•V.54 activation sequence to initiate a V.54 Loop 2 (54UP)

•V.54 deactivation sequence to terminate a V.54 Loop (54DN)

•ANSI T1.403 (Annex B) activation sequence to initiate a DCLB on the remote device (FT1UP)

•ANSI T1.403 (Annex B) deactivation sequence to terminate a DCLB on the remote device (FT1DN)

You cannot perform remote loopbacks if any of the local loopbacks are active. If you attempt to do so, the error message Invld Test Combo (Invalid Test Combination) appears.

NOTE

The following procedures are examples only. Screen displays may vary depending on the model and configuration of the DSU/CSU.

Sending a Line Loopback Up or Down

To send a Line Loopback Up or Down sequence on the network to a far-end DSU/CSU,

1.From the top-level menu screen, select Test.

2.From the Test screen, select Rlpbk.

Test:

Rlpbk Lpbk Ptrns

F1 F2 F3

3.From the Rem Loopback screen, press F1 to select LLBUP (Line Loopback Up), or press F2 to select LLBDN (Line Loopback Down).

Rem Loopback:

LLBUP LLBDN 54UP

F1 F2 F3

The Line Loopback sequence is sent up or downstream to the far-end DSU/CSU for

10 seconds. During this time, Sending appears on Line 2 of the LCD, followed by Command Complete when 10 seconds have elapsed.

You can press any function key to restore the Rem Loopback screen without affecting transmission of the loopback code.

3160-A2-GB21-50 January 1997 4-15