7905G with PoE

Answered Question
Sep 3rd, 2007

Hello,

First of all, I realize this is a discontinued model but I still caught a deal on a brand new one so I decided to go for it.

There seems to be some confusion on what methods of PoE you can use on this phone. On the product sheet here at the cisco website I've noticed that it just says "Inline Power" but not necessarily anything about 802.3af IEEE PoE. After doing some googling I've found two different things, one says you can only use Cisco pre-standard inline power, but the other one says this:

"Newer Cisco equipment (7905G, 7941G, 7961G) is pin compatible with 802.3af, and no swapping is needed."

Can anyone clear this up for me so I can tell for sure what I need to get to make this phone work? I'm kind of paranoid to try to plug my IEEE 802.3af injector into if it's not supported, don't want to blow it up. :)

Thanks a bunch!

I have this problem too.
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Correct Answer by mchandak about 9 years 3 months ago

7905G Phones work on Cisco PreStandard PoE. AFAIK, it does not support IEEE 802.3af. The new model for this phone is 7906G which supports IEEE 802.3af.

Also, please keep in mind that most Cisco Switches with support 802.3af supports, cisco pre-standard power as well.

Hope this helps

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Correct Answer
mchandak Mon, 09/03/2007 - 09:57

7905G Phones work on Cisco PreStandard PoE. AFAIK, it does not support IEEE 802.3af. The new model for this phone is 7906G which supports IEEE 802.3af.

Also, please keep in mind that most Cisco Switches with support 802.3af supports, cisco pre-standard power as well.

Hope this helps

rob.huffman Mon, 09/03/2007 - 11:44

Hi DJ/Mahesh,

Came across this recently;

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

7941G

7931G

7911G

7941G-GE

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

7970G

7961G

7906G

From this new doc;

Power over Ethernet (PoE) Power Requirements FAQ

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

Hope this helps and best of luck!

Rob

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