Inline power for CISCO 79xx standard phones

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May 20th, 2008
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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.

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paolo bevilacqua Wed, 05/21/2008 - 04:31
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Which phone model exactly? If standard PoE, it should work.

ciscomanii Wed, 05/21/2008 - 08:45
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currently have 7960, 40, and 7911 series deployed on a CCM 4.2 sr3

Rob Huffman Wed, 05/21/2008 - 09:30
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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
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Or you can put a Cisco aironet power injector between ip-phone and switch.


Greets,

Norbert

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