User's Manual

TRACER 2xT1 User’s Manual
61280003L2-1B
Section 4 Troubleshooting
39
Preliminary
Recommended Actions:
1. Verify the presence of a DS1/DSX-1 signal at the T1 monitor jack using a T1 test set.
2. Verify that all cables and connectors are correctly wired.
“LBK-A” or “LBK-B” is lit
This alarm will activate when a software or manual T1 loopback has been established.
Recommended Action
Possible Cause (see list below)
• A loopback has been commanded from the VT-100 user interface. ........ 1,2
• The “LBK-A” or “LBK-B” button has been pressed. .............................. 1,2
Recommended Actions:
1. Through the VT-100 user interface, deactivate the loopback in the Loopback Menu.
2. Press the “LBK-A” or “LBK-B” button to deactivate the loopback.
“AIS/YEL” on T1-A or T1-B is lit
The AIS/YEL light will flash for AIS when the DS1/DSX-1 input receives a “blue code” (a string of
2316 1s with no more than one zero). The indicator will remain on (solid) if a YEL signal is present on
the T1.
Recommended Action
Possible Cause (see list below)
• For AIS, the DS1/DSX-1 equipment is sending a “blue code”
(all 1s) to the T1 input. ............................................................................. 1,2
• For YEL, the received T1 is receiving a yellow signal from the
far-end T1, indicating the far-end T1 is RED. .........................................3-5
Recommended Actions:
1. Reset the T1 equipment and verify normal operation.
2. Verify the presence of a DS1/DSX-1 signal at the T1 monitor jack using a T1 test set.
3. Check the far-end equipment for alarms or a red condition.
4. Check the T1 connections at the far-end equipment.
5. Reset the far-end equipment.
I M P O R T A N T
If problems persist after you have followed the Recommended Actions, contact ADTRAN Technical
Support at [phone].