Over the past few weeks my internet connection keeps dropping out, sometimes it requires me unplugging the modem and plugging it in again, other times it just comes back on its own. My ISP is Comcast, and the modem is a DPC2100R2.
If I look at the stats of the modem when the connection to the internet is lost they show as:
Receive Power Level
-15 to 12 dBmV (this fluctuates)
Signal to Noise Ratio
Transmit Power Level
Cable Modem Status
I watched it for a couple minutes, and the receive power was fluctuating, but the SnR and transmit power stayed fairly static.
Any idea's what to do? My wireless network (using DD-WRT over 2 routers) works fine through out all of this. So I am fairly certain it's either a modem or ISP issue. Any suggestions on what to try to figure out the problem and get it fixed?
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See if you can plug the cable modem into a direct drop with no splits and see if the numbers improve.
PhReE's advice is good, but I've worked for a few different providers and different cable modems and CMTS sometimes have different tolerances. You also may be seeing a snapshot without enough speed in updating to see fast fluctuations. Sometimes a tech can pull some of that from the head end or CMTS with better accuracy but the best is by a tech with a good line tester. You mentioned the numbers you posted are when you lose connection. I would compare to when it is working well. Are they any better? Its a good idea for everyone to occasionally document their signals so they have a baseline for when it has a problem.
Splitters are the #1 cause for cable modem signal issues. If I recall, each standard one-into-two splitter affects the signal by 3db. Each one adds up, so try to run your modem off a direct line. Also, they work a bit like light bulbs, deciding to reap havoc one day without notice. For this reason, never build a splitter in the walls and try to avoid splitting in the attic and then topping off your insulation with a few more R factors.