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Nortel M2250 wiring

Nortel M2250 wiring

Nortel M2250 wiring

We have a Nortel Meridian Option 11C that has been working well for over 20 years.
Recently our M2250 stopped working and I discovered wires had broken off inside the DB25 connector going to the console. We ordered a refurbished console, in case the old one had died. But now neither the old console or the new one works with the re-wiring that I have done. Perhaps I killed them in the process of wiring the new DB25 cable, or perhaps I have not understood the proper wiring scheme.

Here is how the new DB25 connector is now wired:

DB25 pin outs TN
14 (tip), 2 (ring) - 1st TN 22-4, yel/blu, blu/yel
15 (tip), 3 (ring) - 2nd TN 22-5, yel/org, org/yel
5 (tip) - Aux + 22-6, yel/grn & 22-7 yel/brn
6 (ring) - Aux - 22-6, grn/yel & 22-7 brn/yel
25 (tip), 13 (ring) – PWR TN 22-8, yel/slt, slt/yel

These are programmed as:
22-4, 22-5 – 1st and 2nd TN’s
22-6, 22-7, 22-8 – PWR TN’s

Does this wiring look correct?
I have also changed out the digital line card for slot 22, but that doesn't seem to help either.
Thanks for any help.

Br Tim

RE: Nortel M2250 wiring

I recall that you usually only needed the 2 TN pairs. The extra PWR TN's were used if the distance was quite a long way from the Phone system.

Firebird Scrambler

Nortel & Avaya Meridian 1 / Succession & BCM / Norstar Programmer

Website = http://somertel.net

RE: Nortel M2250 wiring

Thanks very much for your help.

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