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7911 Constantly rebooting

We took a new 7911 out of the box and configured it up on our CUCM system (6.1.3) At first boot, it upgraded it's firmware. Once we'd configured and tested, we took the phone to site. Plugged it in, and now, it constantly reboots. All other phones at site are fine.

The displays the Cisco splash screen, then eventually, for a brief period, shows the normal screen. Then it flashes "Reboot" in the bottom left hand corner, and starts again. (It never shows "Configuring IP", etc)

We've tried doing a factory reset, and it re-images itself fine. It just never completely comes up afterwards. We've removed it from CUCM, but no change (that was more clutching at straws...)

Unless someone has a bright idea, we're planning on sending it back.

GTG

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10 REPLIES
New Member

Re: 7911 Constantly rebooting

Have you checked the port config? If you plug a different phone to that same port does it come up?

Re: 7911 Constantly rebooting

Nope. Doesn't matter where in the network I plug it in, it just constantly reboots.

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New Member

Re: 7911 Constantly rebooting

Have you checked the power levels on the switch if POe to see if it can support another POE device?

Re: 7911 Constantly rebooting

We've tried it on multiple switches, including my test switch, and a brand new 48 port PoE switch on which this 7911 was the only device plugged in.

I can't see power being the problem.

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New Member

Re: 7911 Constantly rebooting

Mmm,

U checked the bug toolkit then for that firmware version ?

Re: 7911 Constantly rebooting

I've got 10,000+ phones on that firmware fine...

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New Member

Re: 7911 Constantly rebooting

Point taken,

I would say the bootloader is probably corrupt in which case theres not much else you can do.

Hall of Fame Super Gold

Re: 7911 Constantly rebooting

I never saw a really failed cisco phones (does not mean there are not), all treoubles were glitches in the dhcp/tftp process, sometime the 7911 thinks to be a 7906 and so on...

If you connect and configure tftpd323 you will see what I mean.

Re: 7911 Constantly rebooting

But the phone never gets as far as "Configuring IP" And when a phone says "Configuring IP" the first thing it *actually* does is CDP for it's VLAN...

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Hall of Fame Super Gold

Re: 7911 Constantly rebooting

You cannot be sure of what the phone actually does unless hookup wireshark to it.

Of course, if no packets emitted, it is dead for good.

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