connection showing activity when no browsers are on?

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came in this morning and had never noticed it before, but I have a westell
versalink modem. I have verizon dsl
The computer was in hibernation, and I noticed my E1 light was flashing from
time to time.
Only thing that was more or less running in the back ground was Norton's
anitivirus. I have big fix too. No browser or anything else running (msn,
yahoo)
Never noticed the activity light flashing periodically before?
C/A/D networking shows 0 net use, performance shows cpu usisage about 1%,
Physical memory, available the last 3, change alittle? would there be
activity I am unaware of going on? or is it common for the activity light on
the modem to flash from time to time?
Thanks
Bruce



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