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How replacing a line cord causes a fault

We had a call from a new customer that had taken over the premises of a customer I had done work for on a subcontract basis. They had changed the cord on one of their reception phones but this had now caused the other reception phone to get stuck in the initialising mode.

As their phone system is an old Release 3.7 BCM200 that had accumulated quite a bit of dust in it since we recommissioned it and a recent history of doing funny things I did suspect it was system related but I had to go through the basics. When I put my test phone across the extn something didn't sound right. Although its a digital extension so you can't get dial tone with an analogue phone you get to know the sound they make. Nothing for it but to trace it out.

The phone did fire up at the system when the rest of the cabling was disconnected so it confirmed the port on the Digital Station card was OK. This site is old enough that it had telephone cabling and structured cabling for the data has been added later. Upon checking the wiring of the socket (an old 600 style) more closely I found it was still wired for a 4 wire phone - probably left over from an old Commander system that appears to have been installed in the past and had been replaced by the BCM.

The 7316e phones can have an auxiliary power pack connected if they are located a long way from the phone system and this goes through the outer pins of the socket. When the customer had changed the line cord they had changed it to a 4 wire cord so that phone was back feeding into the other one. Simply removing the additional 2 wires from the socket got the non-working phone working again.

ICS Technologies is located in Brisbane, Australia with national coverage through our network of trusted partners. We specialise in keeping your Nortel/Avaya BCM working primarily with replacement power supplies and hard drives.

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