Recently, a user started complaining about his phone/pc intermittently dropping connections. The phone refused to power up with PoE, so it was attached to a power supply. A TDR test showed the last two pairs listed short/crosstalk. The cables in the switch room and user end were replaced, and the user’s Jack was repunched. The outcome didn’t change.
I decided to test the phone and PC separately. A TDR test showed that when connected to the computer, all pairs listed as normal. When connected to the phone without the power supply, all pairs were open. When connected to the phone with the power supply, the last two pairs were short/crosstalk. It didn’t matter which type of Cisco phone or PC was tested, the results were the same.
Has anybody come across this before, and can give a tip on where to go from here?
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