CP-7914 Expansion Module cable length question

Unanswered Question
Jun 5th, 2007

CP-7914 Expansion Module was connected by a long cable (not sure of the length) - RJ11 straight-through cable to the CP-7960G phone and the customer claims that this was working before and all of a sidden stopped working and the CP-7914 show all RED LEDs.

Anyway we sent a tech to site and while troubleshooting he used a short RJ11 (18 cms. long) cable and it all started working.

Is there a specification on the cable length that one can use with this device. Don't ask me why the customer is using a long cable and keeping the CP-7914 far away from the CP-7960G IP phone.

I have this problem too.
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