POE and Cisco Phones

Answered Question
May 10th, 2007

Hi,

I would have a Cisco Installation with a Linksys Switch SRW224P 24 puertos PoE.

As far as I known, Cisco 7911 and 7941 are compatible with that switch, but I am afraid of the swith not having enough power for all 24 ports...

Power feeding of Ethernet is provided on the 10/100 Base-T ports with maximum output power per port of up to 15.4W simultaneously on 12 ports. Alternatively, the switch can power all ports at a maximum of 7.5 W per port.

So, it can power either 24 ports or only 12 ports (half) depending on phone voltage requirements...

Question: Would ALL my Cisco phones work on all the ports of the swith ?

thks

I have this problem too.
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Correct Answer by rob.huffman about 9 years 8 months ago

Hi Andres,

You should be fine for power as both the 7911 and 7941 are Class 2 devices. Have a look;

The 7940G/7941G and 7960G/7961G are class 2 devices (7.7 watts) and the 7941G-GE/7961G-GE phones are class 3 devices (15.4 watts).These are not configurable settings.

Have a look;

7910/7940/7960 Power requirements;

http://www.cisco.com/en/US/products/hw/switches/ps708/products_installation_guide_chapter09186a008020e088.html#wp1008467

The Cisco IP Phone 7911G supports both Cisco inline power and IEEE PoE (Class 2).

From this doc;

http://www.cisco.com/en/US/products/hw/phones/ps379/products_qanda_item0900aecd8039de5e.shtml

Hope this helps!

Rob

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Correct Answer
rob.huffman Thu, 05/10/2007 - 14:53

Hi Andres,

You should be fine for power as both the 7911 and 7941 are Class 2 devices. Have a look;

The 7940G/7941G and 7960G/7961G are class 2 devices (7.7 watts) and the 7941G-GE/7961G-GE phones are class 3 devices (15.4 watts).These are not configurable settings.

Have a look;

7910/7940/7960 Power requirements;

http://www.cisco.com/en/US/products/hw/switches/ps708/products_installation_guide_chapter09186a008020e088.html#wp1008467

The Cisco IP Phone 7911G supports both Cisco inline power and IEEE PoE (Class 2).

From this doc;

http://www.cisco.com/en/US/products/hw/phones/ps379/products_qanda_item0900aecd8039de5e.shtml

Hope this helps!

Rob

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