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New Member

IP phones got no Power

I have a 48 port switch module, 4 switcports on this does not provide power to my IP phones. How would i determine if POE is the problem in my module?

  • WAN Routing and Switching
8 REPLIES
Hall of Fame Super Gold

Re: IP phones got no Power

To begin with, attach a phone known to work, directly to the suspect port using a patch cable.

New Member

Re: IP phones got no Power

There's no problem with the phones since when we attached it on a different switchport they aquired power on the switch.

Hall of Fame Super Bronze

Re: IP phones got no Power

What type of switch and IOS version?

There is a known bug in 3560/3750 switches with power being lost on phones. The fix w/o upgrading the IOS is to issue a 'shut'/'no shut' on the switchports.

HTH,

__

Edison.

New Member

Re: IP phones got no Power

it's a cat4500-ipbase9mz.122-31.SG.bin. Shut/no shut did not work.

Hall of Fame Super Bronze

Re: IP phones got no Power

No known bugs on that release regarding VoIP, it seems you are being affected by a hardware issue.

New Member

Re: IP phones got no Power

But is there a command to show that ff switchports are defective?

Hall of Fame Super Bronze

Re: IP phones got no Power

Not that I know of, sorry.

New Member

Re: IP phones got no Power

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