Loop Channels Lock Up

[nortelephoneguy]

Certain loop channels lock up and calls can not pass them in the hunt sequence. It appears after there is an event or maintenance involving the Manhattan switch. Possibly relating to or following a system restart. We are not aware of this until multiple users report the problem. Incoming callers cannot get through until the loop is reset and then system must be restarted again. I would say this outage has occurred around 7 to 10 times in the past five years. Nortel has never been able to identify and correct the issue. The system is a CS1000.

 

[GHTROUT]

I've seen this on certain T1 spans (not PRI) over the years. Some things to try include the Route Data Block NEDC and FEDC values - setting them to ETH

There are minor security and trunk to trunk issues with those settings. They are best explained here:

http://www.ghtrout.com/ghtrout/files/early_ld16_info.zip

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