ES460-24-PWR POE Problems

[m@sterbl@ster]

Hello,

I am having what appears to be POE issues with some 460-24-PWR switches. 

I plug in one Mitel IP phone and it boots up no problem, but if I try to plug in another phone it powers on, then immediately shuts off, then powers on, then shuts off, over and over again.  I have tried multiple phones in multiple ports, but it seems that I can't get a second phone to stay powered on.  The POE status LED lights up for about a second and then goes out.  Also, in another 460 switch, I have the same problem only I can't even get the first phone to stay powered on.

I have tried disabling and enabling POE on these ports, changing power settings, taken a working phone from one stack and plugged into another 460 with no such luck. Grrrrr

The POE configuration of all of the switches is default and I haven't found any POE "know issues" with the v3.7.2.13 software we are running so I am at a loss.

Any ideas?

Thanks a million!
Bryan

[Michael McNamara]

Hi Bryan,

I've had some ports go bad on the 460 but never that type of behavior.

What specific model of Mitel phone are you using? Is it 802.3af compliant or legacy PoE?

Is there anything of interest in the switch logs? How much power is that single port drawing?

Good Luck!

[m@sterbl@ster]

Good day Michael,

The phones are Mitel 5320 IP Phones and they do accept the IEEE 802.3af standard.  No logs are showing up for this and I enabled link trapping on the port and have yet to see a single trap or a MAC show up on any of the ports.  The Mitel sets that are up and working are drawing only around 3.4 Watts, so I have a pile of head room there.

This is definitely a weird one.

Thanks again Michael!

[Michael McNamara]

I'll be honest and tell you we've seen some pretty bizarre behavior (with respect to PoE) out of a quite a few or our 460 switches.

You could try disabling the legacy PoE support and see if that makes any difference.

Cheers!