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C3750X get power supply errors

Hi, I got a problem with some phones connected to a C3750X-48PS. Phones are Polycom SoundPoint 560. Ports most critical: gig 1/0/9 & 1/0/31.

Actually, the C3750X belongs to a stack, with the IOS: 12.2(55)SE3.  The environment conditions: power supply working ok, temperature level: ok. (show env all). Physically the LEDs are in green, and the room does not have temperature issues.

Also, the phones present a humming noise (high pitch). The noise keeps happening even if the phones are plugged in other ports of a stack. It was attempted to connect the phones directly to the stack ports instead of the ports in the cubicules, and the issue keeps happening.

The Stack presents also sudden fan to spin up / spin down for a couple of minutes, and within a couple of minutes from working on and off.

Customer has another facility with the same switches but with IOS12.2(55)SE1, in there the same phones were tested and they are working fine.


A reboot was performed, but now the C3750X show these messages:

%ILPOWER-3-CONTROLLER_PORT_ERR: Controller port error, Interface Gi1/0/9: Power Controller reports power Tstart error detected

%ILPOWER-3-CONTROLLER_PORT_ERR: Controller port error, Interface Gi1/0/31: Power Controller reports power Tstart error detected


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