ADTRAN 2 x E1 user manual LBK-A or LBK-B is Lit, LOS/OOF Light on E1A or E1B

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Section 4 Troubleshooting

I M P O R T A N T

If problems persist after you have followed the Recommended Actions, contact ADTRAN Technical Support at (011) 256-963-8716.

“LBK-A” or “LBK-B” is Lit

This indicator will activate when a software or front panel command E1 loopback has been established.

	Recommended Action
Possible Cause		(see list below)
•	A loopback has been commanded from the VT100 user interface	. ......... 1,2
•	The “LBK-A” or “LBK-B” button has been pressed	1,2

Recommended Actions:

1.Through the VT100 user interface, deactivate the loopback in the Loopback Menu.

2.Press the “LBK-A” or “LBK-B” button to deactivate the loopback.

LOS/OOF Light on E1A or E1B

The LOS/OOF indicator will flash when an out of frame error has occurred. This indicator will remain on (solid) if a loss of signal has occurred on the E1.

		Recommended Action
Possible Cause		(see list below)
•	TRACER is receiving no E1 signal	.1,2, 3, 4, 5
•	The connection at the E1 input or E1 equipment is faulty	6

•A compatibility or set up problem exists between TRACER and the

E1 equipment…… 7

Recommended Action

1.Reset the E1 equipment and verify operation.

2.Verify the presence of an E1 signal using an E1 test set.

3.Check the far-end equipment for alarms or an UA1 condition.

4.Check the E1 connections at the far-end equipment.

5.Reset the far-end equipment.

6.Verify that all cables and connectors are properly wired.

7.Check CCS/CAS settings of all equipment to assure compatibility.

TRACER 2 x E1 User’s Manual 33