04-06-2008 04:11 AM - edited 03-15-2019 09:52 AM
Hi all
My 7960 phone doesnot take power from PoE switch, Pls tell me what is the problem
Thanks
Sudeesh
04-06-2008 07:36 AM
Hi Sudeesh,
If you are using a non-Cisco switch that provides 802.3af PoE. The problem is that the 7940 and other older Cisco phones use a pre-standard power and not 802.3af PoE which the manufacturers use.
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 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;
http://www.microsemi.com/PowerDsine/Products/Midspan/Splitters/
Hope this helps!
Rob
04-06-2008 10:05 AM
Hi Sudeesh,
If you are adding phones to a Cisco Switch that is currently providing power to phones then you may have reached your limitation to your POE supply.
You can disable POE on trunkports or ports not utilizing power by setting "power inline never" to the port on the switch.
You can also change the default allocated wattage to the switchport. The default is 15.4 watts per device.
Also please see the link below to calculate how much power you will need for your IP phones. This is a great tool.
http://tools.cisco.com/cpc/launch.jsp
Please let us know more information about your situation and we can provide a better solution for your needs.
HTH,
Justin
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