01-13-2022 06:05 AM
When we do a TDR test on a cisco phone we are getting C and D as open. When we plug in a different device we get normal on all pairs. Do TDR tests work on cisco phones?
01-13-2022 02:43 PM
Depends on the switch and depends on the phone.
Does the entire cable path have a power injector in between or a consolidation point?
01-14-2022 05:39 AM
We are able to run TDR on our switch on other ports. The Switches are 9300s. We do not use any power injectors only POE. The model of the phones that are having issues are 7811,7841,8841,8851,7832,8832.
01-14-2022 05:50 AM
What firmware is the switch on?
01-14-2022 05:57 AM
The current version is 17.03.04
01-14-2022 03:03 PM
Take one of the affected phones and directly connect the phones to the switch.
Re-run the TDR & compare the result. This will eliminate any suspicion of a consolidation point.
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