7975 phones constant rebooting

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Feb 26th, 2010
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I have two 7975 phones, one with side car, and the other without.  Both are experiencing reboots several time a day.

Switch logs has no disconnects on the one with the side module, but has disconnects about the phone on the one without.

Their PCs still has connection when phones reboot.  Any ideas on what would cause this?

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Tommer Catlin Fri, 02/26/2010 - 09:00
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Check the POE on the switch.  If you have an edge switch the phone is plugged into, you could be maxing out on POE power on the switch.  Technically, you can not fill a 48 port switch to the max with 48 7975 phones.  There is not enough POE power for all those phones.

You could also simply have a bad port on the switch.  Trying moving it to another switch or another port.

I dont have the command in front of me to check the status of POE or power, but do a show /? and find POE I believe. (Or status of switch)

But if you have 48 ports all filled with phones and using POE, the could be losing power.

Also, sometimes when a phone has issues with switchport negotiations, they will randomly reboot.  IE...  phone is auto and switch port is set to 100 Full, etc.

Also check the patch cables.  Bad cables, could = bad POE power to the phone.

paolo bevilacqua Fri, 02/26/2010 - 09:07
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They may be crashing due to a bug.

Check phone and module FW version, upgrade as necessary.

paolo bevilacqua Fri, 02/26/2010 - 09:25
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You are welcome.

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