[Asterisk-Users] [OT] PoE (Power over Ethernet) for 7940G

Eric Wieling eric at fnords.org
Sat Mar 27 15:12:55 MST 2004

Michael Welter wrote:
> I have a few 7940G phones on a LAN hub, and I'm looking at the 3COM 
> 3CNJPSE power injector.  Can I put one of these behind my LAN hub and 
> power all the phones, or do I need one for each phone?
>  From the spec, it looks like PoE tries to discover whether a device is 
> powered over ethernet.  Can I just put 48VDC on pins 7-8?  Will my 
> Netgear pass this through to the phones?
> Thanks,

Any power injector must be between the device it's powering and any 
other device.

Phone----Power Injector-----switch/hub.

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