cisco 7960G

Unanswered Question
Oct 25th, 2007
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Hi,

i have a problem about this IP phone

I'm trying to power them up from a 3COM switch ref. 4500 PWR but it doesn't work

what i have to verify and what might be the problem thanks in advance

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paolo bevilacqua Thu, 10/25/2007 - 09:13
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Hi,


the 7960 supports only pre-standard cisco PoE, the switch you are using does not supports that.


Hope this helps, please rate post if it does!

Rob Huffman Thu, 10/25/2007 - 09:24
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Hi Saad,


The problem here is that the 7940 and other older Cisco phones use a pre-standard power and not 802.3af PoE which the 3com uses.


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



You probably need a third party product like;


PowerDsine 6000 Power over Ethernet Midspan Family


http://www.powerdsine.com/Products/Midspan/PD_6000.asp


Good chart that shows 7960 etc.


http://www.powerdsine.com/Partners/Cisco/solutions.asp


Hope this helps!

Rob


EDIT: Paolo, please remember my limitations when it comes to typing :) Huff

paolo bevilacqua Thu, 10/25/2007 - 09:38
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Rob, is not a fair comparison. I write a lot less than you :)

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