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erratic speeds with CM 500 Cable Modem
Hi just purchased a CM 500 cable modem for my daughter. Comcast had trouble "finding it" but did eventually. But I noted very erratic up & down load speeds.: 168 Mbps to 1.2 download and 2.5 to nea...
I have found the problem (after hours tracing down the wiring). The problem is / was with the splitter / amplifier. It was difficult to find because I did not install it and the wiring was (shall I say) not direct or obvious.
My Thanks to Net Gear & the knowledgeable folks here. Knowing that the modem was fine and the irratic connection helped isolate the problem.
Case closed & Thanks.
again If you have any splitters, amplifiers, or attenuators in the coax line, I'd remove them. Check the line for kinks, damage, bad/cheap/loose connectors.
The cable connections page is a snip in time from when you opened the page. yes the levels look good but your logs are indicating your signal is fluctuating quite a bit as you're getting frequent dynamic range window violations and t3 errors.
Thanks for the review of the data. This gives me some background to provide the Comcast Tech tomorrow.
My experience is that they are trying to "get in & get out" ASAP and ready not trying to do a root cause analysis. They should be able to "see" this flucuating in real time with their connect box I would think. That would help in locating the issue.
I will try and locate any splitters and check house wiring for bad connections, though I'm not sure where they are located (up to the attic !) :).
I will post the outcome once I get a handle on it. Again, Thanks for your help.
I have found the problem (after hours tracing down the wiring). The problem is / was with the splitter / amplifier. It was difficult to find because I did not install it and the wiring was (shall I say) not direct or obvious.
My Thanks to Net Gear & the knowledgeable folks here. Knowing that the modem was fine and the irratic connection helped isolate the problem.
Case closed & Thanks.
glad to hear you fixed it!
Its challenging when its something you didn't install or even when something small causes issues. I had moisture in a coax once that was causing erratic signals. Was a challenge to find