[cisco-voip] Power over Ethernet

Mon Jan 21 10:42:22 EST 2008

I usually look at the part number of the power supply, has to be
PWR-XXXX-AC-IP;

http://www.cisco.com/en/US/prod/collateral/routers/ps5853/product_data_s
heet0900aecd8016bf0b.html

Not sure how to check via IOS;

Router-2811#show power inline

PowerSupply   SlotNum.   Maximum   Allocated       Status

-----------   --------   -------   ---------       ------

INT-PS           0       160.000    31.500         PS GOOD

Interface   Config   Device    Powered    PowerAllocated

---------   ------   ------    -------    --------------

Fa0/1/0     auto     Unknown  Off        0.000 Watts

Fa0/1/1     auto     Cisco    On         6.300 Watts

Fa0/1/2     auto     Unknown  Off        0.000 Watts

Fa0/1/3     auto     Cisco    On         6.300 Watts

Fa0/1/4     auto     Cisco    On         6.300 Watts

Fa0/1/5     auto     Unknown  Off        0.000 Watts

Fa0/1/6     auto     Cisco    On         6.300 Watts

Show run

interface FastEthernet0/0

 description Unused

 no ip address

 shutdown

 duplex auto

 speed auto

!

interface FastEthernet0/1

 description Unused

 no ip address

 shutdown

 duplex auto

 speed auto

!

interface FastEthernet0/1/0

 switchport mode trunk

 spanning-tree portfast

!

interface FastEthernet0/1/1

 switchport mode trunk

 spanning-tree portfast

!

interface FastEthernet0/1/2

 switchport mode trunk

 spanning-tree portfast

!

interface FastEthernet0/1/3

 switchport mode trunk

 spanning-tree portfast

!

interface FastEthernet0/1/4

 switchport mode trunk

 spanning-tree portfast

!

interface FastEthernet0/1/5

 switchport mode trunk

 switchport voice vlan 31

 spanning-tree portfast

!

interface FastEthernet0/1/6

 switchport mode trunk

 switchport voice vlan 31

 spanning-tree portfast

!

interface FastEthernet0/1/7

 switchport mode trunk

 switchport voice vlan 31

 spanning-tree portfast

!

interface FastEthernet0/1/8

 switchport mode trunk

 switchport voice vlan 31

 spanning-tree portfast

!

From: Kevin Dunn [mailto:cheesevoice at gmail.com] 
Sent: Monday, January 21, 2008 10:31 AM
To: Jason Aarons (US)
Subject: Re: [cisco-voip] Power over Ethernet

How do I check the AC power supply?

Cabling was checked and passed on.  I used the cable in the phone box
(7961) also I plugged a spare 3750 into the network and all the phones
registered and worked as I should.  I just don't want to waste a 3750 on
a site that already has a ESW in the router. 

thanks for the rapid reply

Kevin

On 1/21/08, Jason Aarons (US) <jason.aarons at us.didata.com> wrote: 

Does the router have the correct AC power supply for the NM-16ESW?

Did the wiring pass a certification test?

A fluke meter would show if voltage is being applied by NM-16ESW, etc.

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Kevin Dunn
Sent: Monday, January 21, 2008 10:22 AM
To: Cisco Voice
Subject: [cisco-voip] Power over Ethernet

Okay so this is a newbie question, but I can't seem to find the answer.

I have an MGCP Gateway on a 2811 

this is a small 5 person office so they have an Ethernet module on the
router. (NM-16ESW) with a power card (PPWR-DCARD-16ESW).

This weekend I tried to cut over the site and I can't get power to the
phones.

the Config looks like this:

Interface FastEthernet1/1

decription Sue's Phone and PC

switchport access Vlan 4

switchport voice vlan 3

duplex full

speed 100

power inline auto 

mls qos cos override

spanning-tree portfast

according to the router my options are power inline (auto, never).  Do I
need cdp enabled on the port to detect the phone?  How do I get power to
the phones?

Much appreciated

Kevin Dunn  

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