IP phone power consumption on 3560E

evian

Hi,

Not sure if this is the right place to ask but i've got a question regarding power supplied to POE ports.

I've got a WS-C3560E-48PD-S switch, which the cisco website states "420W available for Cisco Enhanced PoE, allowing > 15.4W to all 24 ports"

A couple of things regarding this:

1. Why does it say all 24 ports, when it is a 48 ports switch? Does this mean POE is only available on half the ports?

2. Assuming that POE is available to all of the ports this averages at 8.75w per port. Can anyone tell me if this is sufficient power to run an IP phone? i.e 48 phones off the 48 ports.

It would seem silly to offer a 48 port POE switch which isn't capable of running 48 IP phones.

Any help Apprciated.

peanutnoggin

evian wrote: »

Hi,

Not sure if this is the right place to ask but i've got a question regarding power supplied to POE ports.

I've got a WS-C3560E-48PD-S switch, which the cisco website states "420W available for Cisco Enhanced PoE, allowing > 15.4W to all 24 ports"

A couple of things regarding this:

1. Why does it say all 24 ports, when it is a 48 ports switch? Does this mean POE is only available on half the ports?

This url from Cisco's site lists the switch as a 48 port POE switch which is typical. I've never heard of a switch with only half of the ports being POE.

evian wrote: »

2. Assuming that POE is available to all of the ports this averages at 8.75w per port. Can anyone tell me if this is sufficient power to run an IP phone? i.e 48 phones off the 48 ports.

It would seem silly to offer a 48 port POE switch which isn't capable of running 48 IP phones.

Any help Apprciated.

The 8.3 per port should be fine. Typical Cisco IP phones are 6.3W per phone. Also, keep in mind, you can hardcode the power being sent to the port on a Cisco switch. This will allow you to dedicate more or less power to a port depending on the role of a port. I hope this helps.

-Peanut

pitviper

I think that you can actually get into trouble with some of the newer gig-e/color phones but I load them up with 7941s and 7931s all of the time:

XXXX_SW3560#show power inline
Available:370.0(w) Used:301.2(w) Remaining:68.8(w)

Interface Admin Oper Power Device Class Max
(Watts)

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Fa0/1 auto on 6.3 IP Phone 7941 2 15.4
Fa0/2 auto on 6.3 IP Phone 7941 2 15.4
Fa0/3 auto on 6.3 IP Phone 7941 2 15.4
Fa0/4 auto on 6.3 IP Phone 7941 2 15.4
Fa0/5 auto on 6.3 IP Phone 7941 2 15.4
Fa0/6 auto on 6.3 IP Phone 7941 2 15.4
Fa0/7 auto on 6.3 IP Phone 7941 2 15.4
Fa0/8 auto on 6.3 IP Phone 7941 2 15.4
Fa0/9 auto on 6.3 IP Phone 7941 2 15.4
Fa0/10 auto on 6.3 IP Phone 7941 2 15.4
Fa0/11 auto on 6.3 IP Phone 7941 2 15.4
Fa0/12 auto on 6.3 IP Phone 7941 2 15.4
Fa0/13 auto on 6.3 IP Phone 7941 2 15.4
Fa0/14 auto on 6.3 IP Phone 7941 2 15.4
Fa0/15 auto on 6.3 IP Phone 7942 2 15.4
Fa0/16 auto on 6.3 IP Phone 7941 2 15.4
Fa0/17 auto on 6.3 IP Phone 7942 2 15.4
Fa0/18 auto on 6.3 IP Phone 7941 2 15.4
Fa0/19 auto on 6.3 IP Phone 7941 2 15.4
Fa0/20 auto on 6.3 IP Phone 7941 2 15.4
Fa0/21 auto on 6.3 IP Phone 7941 2 15.4
Fa0/22 auto on 6.3 IP Phone 7941 2 15.4
Fa0/23 auto on 6.3 IP Phone 7941 2 15.4
Fa0/24 auto on 6.3 IP Phone 7941 2 15.4
Fa0/25 auto on 6.3 IP Phone 7941 2 15.4
Fa0/26 auto on 6.3 IP Phone 7961 2 15.4
Fa0/27 auto off 0.0 n/a n/a 15.4
Fa0/28 auto on 6.3 IP Phone 7941 2 15.4
Fa0/29 auto on 6.3 IP Phone 7941 2 15.4
Fa0/30 auto on 6.3 IP Phone 7941 2 15.4
Fa0/31 auto on 6.3 IP Phone 7941 2 15.4
Fa0/32 auto on 6.3 IP Phone 7941 2 15.4
Fa0/33 auto on 6.3 IP Phone 7941 2 15.4
Fa0/34 auto on 6.3 IP Phone 7941 2 15.4
Fa0/35 auto on 6.3 IP Phone 7941 2 15.4
Fa0/36 auto on 6.3 IP Phone 7941 2 15.4
Fa0/37 auto on 6.3 IP Phone 7941 2 15.4
Fa0/38 auto on 6.3 IP Phone 7941 2 15.4
Fa0/39 auto on 6.3 IP Phone 7941 2 15.4
Fa0/40 auto off 0.0 n/a n/a 15.4
Fa0/41 auto off 0.0 n/a n/a 15.4
Fa0/42 auto on 6.3 IP Phone 7941 2 15.4
Fa0/43 auto on 6.3 IP Phone 7941 2 15.4
Fa0/44 auto on 6.3 IP Phone 7941 2 15.4
Fa0/45 auto on 6.3 IP Phone 7941 2 15.4
Fa0/46 auto on 12.2 AIR-AP1131AG-A-K9 3 15.4
Fa0/47 auto on 12.2 AIR-AP1131AG-A-K9 3 15.4
Fa0/48 auto on 12.2 AIR-AP1131AG-A-K9 3 15.4

evian

Fantastic. Thanks guys.