[cisco-voip] Power consuption by 7941G-GE with POE swithes

[Voll, Scott]

Anthony-

 

This just came up on the list a couple of weeks ago and I ran it past my
SE.  The Gig phones require twice the power of the non-gig phones and
therefore you can only run 24 gig phones on a 48 port PoE switch....
Leave it to cisco to come up with such a great design....... NOT.
Basically I got the impression that if you were going to use all Gig
phones to buy only the 24 port switches.   Ci$co.

 

Scott

 

________________________________

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Anthony
Kouloglou
Sent: Wednesday, June 07, 2006 3:46 AM
To: cisco-voip at puck-nether.net
Subject: [cisco-voip] Power consuption by 7941G-GE with POE swithes

 

Hi all,
i have implemented at a customer a WS-C3560G-48PS (POE) and several
7941G-GE phones.

1.How much power (in Watts) do they need when they are with inline power
from the switch? In the specifications of the phone it says: 
"48 VDC, 0.2 A-when using the in-line power over the network cable" (so
does it need 48x0.2=9.6watts to work?) . 
I must use the command "#power inline static max <milliwatts>" to
restrict the phone from drawning the maximum power which is now
12.9Watts (as shown by show cdp neaighbous detail) and so it reduces the
maximum number of phones the 3560 can support (after i put 27 phones it
could not give any more power)?
2. For a 7971, i also plugged the power cube but it continues to drawn
15.050Watts!! AC power adaptor cannot cover it's needs for power and so
it would not have to drawn any power from the POE switch?
3 Can i use a RPS that i have on site and configure it to give extra
power to the switch to support 48 phones of any kind?

Thanks a lot
Anthony kouloglou

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