[cisco-voip] Strike 2 - Dead 7940G IP Phones

[Wes Sisk]

Way back in the day there was
http://www.cisco.com/en/US/ts/fn/200/fn27255.html

are your phones within the s/n range?

/wes

Micah Bennett wrote:
>
> Waiting on my network admin to get in so I thought I would send this 
> out and see if anyone has seen this before.
>
> Tuesday morning 3:00am, a single IP phone (out of 200) on our network 
> (being used by the single call center agent on that shift) loses 
> connection to the network and shows "Ethernet Disconnected" on the 
> phone screen.
>
> We are using Cisco 3560 switches for our user network with POE from 
> the switch.  Ethernet cable from the wall to the phone and from the 
> phone to the PC. 
>
> Did not think much about it at that time, just figured it was a bad 
> phone.  First one since our deployment last July.  I replaced the 
> phone with a spare and sent the bad one back to Cisco under RMA.
>
> In testing the bad phone, it seems that the internal network switch is 
> completely dead.  After the initial failure it showed "Ethernet 
> Disconnected" on the screen so it was still getting POE from the 
> switch.  When disconnected and moved to another network port, it will 
> not come back on with POE.  I had to use a power cord to supply power 
> and the phone still shows "Ethernet Disconnected".
>
> Everything was fine all day Tuesday, and Wednesday.
>
> Thursday morning, 3:00am, exact same problem on exact same network 
> port, killing the replacement phone that was installed on Tuesday.  
> Everything is exactly the same even down to the time of failure.  
> Phone exhibits the exact same symptoms.  Was responding to POE but 
> showing Ethernet Disconnected until disconnected from the network.  
> After disconnection, the unit only responds to power from a cord, and 
> not POE.  Still shows Enet Disconnected.
>
> Is the POE coming from the switch on this port killing the phone?  Has 
> anyone seen anything like this before?
>
> Right now that station does not have a phone.  I don't want to burn up 
> a third one.
>
> ***Micah Bennett*
>
> Telecommunications Admin
>
> *Automated License Systems*
>
> ------------------------------------------------------------------------
>
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