Question about Cisco 7940 IP Phone
Change out your cable from the wall drop to the phone. A Cisco phone is capable of receiving inline power (Power Over Ethernet) via the blue and brown pairs of the cable. It sounds like you may have a cable with a short in either the brown or blue, or both pairs, shorting out the power when it is connected via ethernet.
If you can, have your IT Tech check the cable, and the line through the wall to the switch.
Posted on May 26, 2010
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Posted on Jan 02, 2017
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