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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.
do you have a screen snip of the cable connections page and the logs?
Those help us check the connection.
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.
Thanks for the rapid reply.
The download signal for all 16 channels range from 4.3 dbmv to 5.0, so that looks pretty good I think.
The upload signal for all 4 channels range from 40.5 dbmv to 42.5, again that looks pretty good.
My speed ranges from 1.2 Mbps to 23.5 to (at times) with 168.3 rarely (download). Upload ranges from 0 to 1.2 Mbps. All with a service of "up to" 300 Mbps; so something is drastically wrong here. :)
I'm having a Comcast tech come out on Saturday to take a look at, but if I'm getting those signal levels it sounds like the issue is not with the modem, but let me know your thoughts. I'll post what I find out. Thanks again.
tomham wrote:Thanks for the rapid reply.
The download signal for all 16 channels range from 4.3 dbmv to 5.0, so that looks pretty good I think.-------a screen snip would be better than "i think"
The upload signal for all 4 channels range from 40.5 dbmv to 42.5, again that looks pretty good.
My speed ranges from 1.2 Mbps to 23.5 to (at times) with 168.3 rarely (download). Upload ranges from 0 to 1.2 Mbps. All with a service of "up to" 300 Mbps; so something is drastically wrong here. :)----Thats where the logs and the cable connection page helps.
I'm having a Comcast tech come out on Saturday to take a look at, but if I'm getting those signal levels it sounds like the issue is not with the modem, but let me know your thoughts. I'll post what I find out. Thanks again.
Cable Connects file attached.
(more to come, since I can only attach one file at a time)
