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Home > Archive > Voice over IP Cisco > May 2005 > 7936 power supply on 7912/7940 phones?
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7936 power supply on 7912/7940 phones?
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| Benny Giebens 2005-05-19, 7:45 am |
| Hi all,
We use all 7912/7940 phones with power adapters. Now we got a 7936
conference station and I noticed that this station has a special power
adapter.
On the power adapter you connect the power and the network connection,
and from the power adapter to the station there is only a network cable.
Now I suppose that this adapter puts power over Ethernet on the network
connection so the conference station has network connection and power
via the Ethernet cable.
Now my question: Can this power adapter also be used with a 7912/7940
phone?
Obviously the reason why is that we don't have to put ll poe switches on
locations where we only need one phone working if there is a power
failure. Put this power adapter in the computer room on the ups and it
should do the trick.
Anyone already tried this ?
Rgds
Benny Giebens
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| David Sullivan 2005-05-19, 5:45 pm |
| On 19 May 2005 at 14:23, Benny Giebens wrote:
>
>
> Now my question: Can this power adapter also be used with a 7912/7940
> phone?
>
> Obviously the reason why is that we don't have to put ll poe switches
> on locations where we only need one phone working if there is a power
> failure. Put this power adapter in the computer room on the ups and it
> should do the trick.
>
>
>
> Anyone already tried this ?
I've never seen the power blocks that come with 7936 conference
stations since we don't have one but if you wish to do PoE for single
phones you can buy 3com single port midspans [1] very cheaply that
can power 7912s (and 7940s if you are happy making a custom patch
lead).
We've used these in areas where we only have 1 or 2 phones hanging
off of one switch with great success and it's a lot nicer than
powering the phones using the cisco power blocks since you can plug
the midspan into the same supply/UPS as your switch as you would
like.
[1] http://shrunk.net/58959ff6-www.3com.com
David.
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