sundance-communications.com/forum Forums TDM Business Telephone Systems NEC Telephones & Systems Layer 1 on IPK

I have a PRI that keeps going down. The phone states its a Layer 1. I have done everything except replacing the PRT card. Telco says its our problem. any suggestions before I do replace the card.

Keeps going down? So, it runs for a while & drops? Sounds like a cabling issue or provider issue. I always have a spare PRI card & clock module handy to swap out, that way the customer won't think the return calls are your equipment. If you need a spare, let me know. Layer 1 error is what you will see when the d channel is lost.

The last time the PRI went down we lost the dial tone when you dialed 9 to get out. The calls still go out though.

Layer 1 is Physical layer -- wiring.

Check your wiring. Do loopbacks. Try a different card slot/punchdown. Check your jacks, etc.

The fact that it's intermittent suggests that it might be a jumper or cable with a break under the insulation (insulation sometimes holds it together, sometimes lets it separate.

Also, check the alarm type. Red Alarm on T1/PRI means that the problem is HERE, Yellow means that it's at the Telco.

You most likely have a copper back-up route in your ARS now.

Check the amp cable on the side of the ksu, there's only the velcro holding it in, make sure it's seated 100%.

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