asterisk users - Oct 2005 - Cisco 7905G Power over Ethernet - does it work?

Perhaps this question should be directed to Cisco support, but since 
these guys made me nuts ("please check that your cable is plugged in 
correctly" etc.), I thought I'd ask here.

We bought a Cisco 7905G phone, which boasts to have PoE (Power over 
Ethernet) support.

We have a Netgear FS108P PoE switch, which works with other PoE devices, 
but not with this Cisco phone.
I searched the voip wiki - http://www.voip-info.org/wiki-Cisco+POE - and 
found a suggestions to reverse some cables in the ethernet wire.

So I did, but Cisco 7905G phone still doesn't power up.

Does anyone have any suggestions on how to make this phone work with a 
PoE switch?


-- 
Tomek
http://wpkg.org
WPKG - software deployment and upgrades with Samba

Tomasz Chmielewski ha scritto:
> We bought a Cisco 7905G phone, which boasts to have PoE (Power over 
> Ethernet) support.
the 7905 can be powered using pre-standard inline power.
So it /doesn't do 802.3af/
> I searched the voip wiki - http://www.voip-info.org/wiki-Cisco+POE - 
> and found a suggestions to reverse some cables in the ethernet wire.
> So I did, but Cisco 7905G phone still doesn't power up.
No way to power up the phone is the the switch can be forced to send 
power in any case.

Sergio

Sergio Chersovani ha scritto:
> No way to power up the phone is the the switch can be forced to send 
> power in any case.
I meant that the phone can power up with a custom poe injector that does 
not care about 802.3af

Sergio

Sergio Chersovani schrieb:
> Sergio Chersovani ha scritto:
> 
>> No way to power up the phone is the the switch can be forced to send 
>> power in any case.
> 
> 
> I meant that the phone can power up with a custom poe injector that does 
> not care about 802.3af
does poe injector = poe switch (is poe switch and poe injector the same 
thing but a different name)?

if so, it means my switch is not "dumb enough" or what?

anyone knows if it can be "dumbified" (some special cable, adapter
etc.)?

Hello Tomasz,

I got the 7905 working with an Dell POE switch without any
modifications of cables, the 7960 also works on the Dell switch but
you have to modify the cable.

I also tried the Netgear FS108p and it does not work with the 7905,
7912 and 7960 as I have tested. Even with modified cables no go on the
Netgear. I believe the Cisco uses the CDP protocol to get juice from
the switch, and the Netgear doesn't understand that.

Regards,

Mus

Dell 3424P, has poe, Qos,and Vlan

Mus