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

Andrew Thompson asteriskuser at aktzero.com
Sun Mar 28 21:20:42 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,

If you do this, please have a battery powered video camera ready, I want to
see it!

No offense intended, honest.

A friend of mine insists that if you hook up the power to a floppy drive
backwards it creates this nice little poof of blue smoke.

Andrew Thompson

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