need help with diagnostics

[mccarron]

I'm a network guy. Not a telephone guy. My boss asked me to look at a problem a non-profit that's next door to us and see if I could do anything. I guess its are good deed for this month.

They have NT7B56 telephone switch with two lines to the outside world. Eight telephones internal. Meridian phones 5310.

There problem is that one of there line gets no dial tone. It sounds like someone hung up on one end and it didn't hang up on the other. I went to the demarc and was able to call out and receive calls in. I toned out the line between the demarc and the switch and that seemed good. I disconnected all the phones and then reconnected them one at a time thinking that one of the phones may have been bad, but I still can't get any dial tone.

What else can I do to diagnose the problem. I tried to get into the maintenance routine, but there was no down arrow that the book says there should be.

Any help would be appreciated. What do you think the problem is. I can't find anything about the switch on the Nortel website so I assume that thing is so old they have given up on it

 

[hawks]

You need to move this to the NORSTAR Forum you'll get some more responses. That said it looks like one of your line ports could have blown out on the card. That card should support 4 lines so you could move your cross connect down to the next line port and try it then. Next question how are you logging into the system I'm not really sure what you mean by a DOWN ARROW.

 

[GHTROUT]

The experts on that system reside in the following forum: forum799

The system can be referred to as a Norstar-Plus Compact ICS.

My second thought would be just to cycle the power, but my first thought is the cmos battery is dead.



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[mccarron]

thanks for answering

Other line is working properly so I assume CMOS is ok
I will try move the cross connect to other connection. There is a 25 pair going to the switch.

the documentation says you can program the switch from a phone. When I log in, right and left arrows show up on the phone in the display windows next to the feature buttons, but no up or down arrow. The book says there should be a programming overlay which the customer doesn't have.

I will repeat this message in the nortel forum. thanks!