Adtran T1 CSU ACE User Manual download pdf (Page 35)

61202022L1-1B T1 CSU ACE User Manual 35

Chapter 3 Troubleshooting and

Maintenance

Troubleshooting guidelines and maintenance information are provid-

ed in this chapter.

TROUBLESHOOTING

Power

Condition: PWR LED is not illuminated.

1. If locally powered, verify the power cable installation.

2. If the 12 V wall-mount power supply is used, check the supply’s

cable and the circuit breaker for the 120 V receptacle the supply is

plugged into.

Network LOS

Condition: NET LOS LED is illuminated.

1. Verify that the cable from the network demarcation is in

NET

modular jack on the bottom/end of the T1 CSU ACE.

2. If all connections seem intact, the far end CSU ACE can be

looped back (using a BERT test set to send the LB code, or using

MANUAL LB at the other end) to isolate the problem to the far

end customer premises or the network.

3. If the problem persists after the LB has been activated, the prob-

lem appears to be within the network or the far end CSU ACE. In

this case, notify the carrier.

4. If the problem disappears after loop-up, then the cause must be

at the far end customer premises.

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Adtran T1 CSU ACE User Manual Page 35