sundance-communications.com/forum Forums TDM Business Telephone Systems Avaya - Lucent Telephones & Systems Merlin 820

OK, I have another question for the gurus.

At the church were I am looking to install a new system in the spring I currently have an old Merlin 820 installed temporarily.

4 lines with 4 10 button BIS sets.

Everything works great, except. One phone frequently stops working, sortof. All the buttons, lights, etc work, but no sound. Phone does ring, you can answer the call and put it on hold but you hear nothing and the caller does not hear you. If you pick up a line you don't hear dial tone.

In order to get things working again, I have to unplug the line to that phone and plug a phone directly into the control unit on that extension, then I can plug the line back in and it works again. Works for a couple of days and then happens again.

Any suggestions as to what might be causing this. I have tried swapping the phone set, that is not it. Could I have a bad pair? If so which one, maybe I could swap it with another one. I know that this set uses all 4 pair, but not sure in what capacity, maybe I could swap the pairs around.

Thanks for your help.

Jim

Swap ports with one that's working and if the trouble stays on the same port you have a bad port and just plug it into another. If the trouble stays at the same location (cable) you probably have a bad or damaged cable. Than you can go from there.

The white/blue pr. is voice,If you use another spare ext. port at system does same problem occur, if so is 8 pin modular plug used to plug cable into system factory or handcrimped? Might have loose wire in plug.Use another ext. port for a few days to test.

If you can still intercom, Bad blue/white pair. Look for old or corroded connections.

Swap the phone with another that you know works. If the trouble stays with that extension replace the jack, replace the plug at the system end and replace the line cord for the phone too.

If the problem moves with the phone replace the phone.

-Hal

I know it's not the phone, as I have tried two different phone sets and gotten the same results. Also have used different extention port and line cord.

Building wiring terminates on 110 block on phone board and then short cable with crimp connector runs to system. I will try replacing that and then try replacing the wall jack.

Thanks for your help.

The white-brown pair is really only used for HFAI, so it's not critical for normal operation of the phone. I would try swapping the white-blue and white-brown at both ends of the cable run and see what happens. It has to be a high-resistance fault on the white-blue pair causing this. I can't imagine anything else it could be.

jacktel is giving you the ANSWER!

You are having a problem with the VOICE PAIR (Whi-Blue/Blue-Whi).

Fix that, and your problems will go away.

It pretty much takes all 4 pairs for these phones to work.