From: A.G. Ananth Sarma (GMail) (ananth.sarma@gmail.com)
Date: Wed May 28 2008 - 06:35:30 ART
Hi Geert,
I had a similar issue on 3560 PoE switches where the 25th phone does not
get the power.
This is due to the fact that the power available on the switch was 370 W and
by default, each port is allocated 15.4 W.
(370 / 15.4 = *24.026* phones max).
As per one of the Voice Experts in the GS, I tweaked the power on the switch
ports to 6.3W ( IP Phone 7941) and 5.0 W ( IP Phone 7911) and so on. By this
way, I managed to utilise more or less all the ports.
( IP Phone 7971 should also work with 6.3 W which I do not remember
exactly).
To do this, go to the interface config mode and run : *power inline
consumption 6300*
You may get a warning, but that is ok to ignore. Better shutdown the port
before apply this command.
I know what I have written above may not be *fully* relevant to your case,
but may be handy for later usage.
Try shutting down the ports and enable / Or reload the 4th switch during
non-production hours.
Let us know as to how you fix this.
Regards,
Ananth
On Wed, May 28, 2008 at 11:43 AM, Geert Nijs <Geert.Nijs@simac.be> wrote:
> Hi group,
>
> Is it possible for a 3750 to fail completely regarding PoE, but keep
> functioning normally for the rest ?
> Are all PoE-functions controlled by one critical "power controller" maybe ?
> I have a PoE-capable switch, where suddenly the available power has dropped
> to 0 and not a single port gets powered....
>
> sh power inline
> Module Available Used Remaining
> (Watts) (Watts) (Watts)
> ------ --------- -------- ---------
> 1 370.0 170.1 199.9
> 2 370.0 155.6 214.4
> 3 370.0 187.1 182.9
> 4 n/a n/a n/a <<<<<<<--------
> ??????????????
>
> Switch Ports Model SW Version SW Image
> ------ ----- ----- ---------- ----------
> * 1 52 WS-C3750-48P 12.2(25)SED1 C3750-IPBASE-M
> 2 52 WS-C3750-48P 12.2(25)SED1 C3750-IPBASE-M
> 3 52 WS-C3750-48P 12.2(25)SED1 C3750-IPBASE-M
> 4 52 WS-C3750-48P 12.2(25)SED1 C3750-IPBASE-M
> <<<--- power enabled.
>
> regards,
> Geert
>
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