[Asterisk-Users] 7960 Dies when network cable connected

[niles at atheos.net]

Christopher Jacob wrote:

>Hey All,
>
>I have a user whose Cisco 7960 died the other day. When you disconnect the
>Ethernet cable the phone boots (as far as it can w/o network connectivity)
>but as soon as you plug in the CAT5 it goes dead. (no lights, no sound, no
>display, nothing)
>  
>
Christopher,

Just as a total guess, check to be sure the PoE portion of his cat5 
cable are not either grounded, or touching
each other.  Also, be sure he's not connected to a PoE capeable switch 
since cisco is reverse polarity of the
PoE standard.
Niles