Inline power for CISCO 79xx standard phones

Unanswered Question
May 20th, 2008

I need a solution to provide inline power to standard CISCO 79xx phones from a non-proprietary POE switch without utilizing a power brick. The switch in this case is a D-Link DES 1228P.

I have this problem too.
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ciscomanii Wed, 05/21/2008 - 08:45

currently have 7960, 40, and 7911 series deployed on a CCM 4.2 sr3

rob.huffman Wed, 05/21/2008 - 09:30

Hi Joseph,

Because you are using a non-Cisco switch that provides 802.3af PoE. The problem is that the 7940,7960 and other older Cisco phones use a pre-standard power and not 802.3af PoE which this manufacturer uses. The 7911 should be good to go :)

Q. What IP phone models support the Cisco pre-standard method of powered device detection?

A. These Cisco IP phones can accept Cisco pre-standard PoE from a card integrated with a Cisco Catalyst switch or a Catalyst in-line power patch panel:

7985G

7960G

7940G

7910G

7910G + SW

7912G

7905G

7902G

These phones can draw local power from a power cube (CP-PWR-CUBE-2=) in addition to a country or regionally specific power cord (CP-PWR-CORD-xx=).

Q. What IP phone models support the IEEE standard method of powered device detection?

A. These Cisco IP phones support IEEE 802.3af PoE:

7961G-GE

7971G-GE

7931G

7911G

7941G-GE

Note: These Cisco IP phones support both the Cisco pre-standard PoE and IEEE 802.3af PoE:

7970G

7961G

7941G

7906G

From this great doc;

Power over Ethernet (PoE) Power Requirements FAQ

http://www.cisco.com/en/US/products/hw/phones/ps379/products_qanda_item09186a00808996f3.shtml

You probably need a third party product like;

http://www.microsemi.com/PowerDsine/Products/Midspan/Splitters/

Hope this helps!

Rob

alig.norbert Wed, 05/21/2008 - 12:29

Or you can put a Cisco aironet power injector between ip-phone and switch.

Greets,

Norbert

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