POE bump-in-the-wire conversion

Fri Dec 31 17:42:21 UTC 2010

We have some Aastra 9480i phones that are 802.3 af running off of a cisco  
3550 that are Pre-Standard power.

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps646/prod_qas09186a00800913d3.html
"Q. Does the Cisco Catalyst 3550-24 PWR Switch support the 802.3af inline  
power standard?
A. No, this switch supports Cisco Pre-Standard Power over Ethernet. The  
Catalyst 3750 Series and Catalyst 3560 Series support the Cisco  
Pre-Standard Power over Ethernet and IEEE 802.3af Power over Ethernet."

I used the command

  power inline delay shutdown 20 initial 100

on the ports connected to the phones and it seems to be working just fine.

It may just be a lucky break for us but something worth trying?

-=Tom

On Fri, 31 Dec 2010 09:00:40 -0600, Robert E. Seastrom <rs at seastrom.com>  
wrote:

>
> Perhaps someone from this august list can offer a clue here.
>
> Have:  Cisco 3524-PWR  (paleo-POE, pre-802.3af Cisco standard).
>
> It runs the 7960Gs great.
>
> Have:  Wireless AP stuff that wants 12v on the unused pairs for
> passive POE.  48v will let the magic smoke out.
>
> Might buy:  phone that does 802.3af
>
> Want to run these with the 3524-PWR.
>
> I can't imagine that nobody makes a bump-in-the-wire converter for
> this application, but haven't been able to find anything other than
> 802.3af to the passive POE use case.
>
> Anyone got a pointer for me?
>
> Thanks,
>
> -r
>
>

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