Hi,

This is some info that may be of help.

Interfaces resets happen when packets queued for transmission were not sent
within several seconds.

On Serial this can be caused by a malfunctioning of modem that is not
supplying the clock signal or by a cable problem.

If the system notices that the carrier detect line of serial interface is
up, but the protocol is down, it periodically resets the interface in an
effort to restart it.

Interface resets can also occur when the interface is looped back or shut
down.

For more details lookup Serial and Trouble shooting, or check the CIT exam
certification guide by Cisco Press.

cheers
Vijay Patankar
CCSI,CCNP


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