POE and 7940 ip phone

Unanswered Question
May 29th, 2008
User Badges:

I have a 2811-ac-ip with a NME-16ES-1G-P card install I can get a 7941 to power up, but the phone I have are a 7940 and they will not power up. The swith is running 3750 Software (C3750-IPBASE-M), Version 12.2(35)SE5. Please help

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Loading.
thisisshanky Thu, 05/29/2008 - 08:17
User Badges:
  • Purple, 4500 points or more

Have you tried powering this particular phone on another inline power switch ? Just wondering if its a bad phone?

Rob Huffman Thu, 05/29/2008 - 08:32
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 IP Telephony, Unified Communications

Hi Douglas,


It sounds like this bug (Thanks Met!);


CSCsi70300 Bug Details


NME Etherswitch Service Module Not Detecting Pre-Standard Devices

Symptom:

Pre-Standard POE devices are not powering up, link is down/down.


Conditions:

PreStd POE device must be connected to Etherswitch Service Module (ex. NME-16ES-1G-P) running 12.2(35)SE2.


Workaround:

Downgrade IOS to 12.2(25)SEE3


Further Problem Description:

Althought the NME runs 3750 IOS, the problem is not seen on a 3750 switch.

The IEEE 802.3af devices function fine (ex. 7961, 7941), only Pre-Std are affected.


Hope this helps!

Rob

qwest5555 Thu, 05/29/2008 - 10:56
User Badges:

Downgraded switch to IOS to 12.2(25)SEE3

Everything work great !!


Thnaks


Doug


Shane Kirby Thu, 05/29/2008 - 11:25
User Badges:
  • Cisco Employee,

If you need to run a later version of IOS for other features this defect is resolved in 12.2(40)SE or later.

mattman04 Thu, 05/29/2008 - 14:18
User Badges:

I'm seeing similiar behavior on my Cisco 1801.

POE - power supply is connected and POE LED is green, but when I connect 7941 phone it does not power up.


I'm running IOS Version 12.4(11)T4.


The inline power config is set for auto on all ports and a 'show power inline' sees an 80 watt power supply, but nothing allocated to any of the ports.


Any thoughts would be greatly appreciated.


Thanks...matt


Actions

This Discussion