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We are using a cm1000 with the 1gig service from xfinity in utah. This has worked amazingly well until just last week. The uncorrectable codewords are through the roof and our bandwidth is now at best 200mb/s down. It also stalls (but recovers after like 30 to 45 seconds) a lot now. Can anyone look at the readout and tell me if any of this points to what the real problem is?
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The SNR's are too low / out of spec, and the upstream power levels are too high. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.
In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test
If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.
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We ask that you post publicly so people with similar questions may benefit from the conversation.
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Hello, @Switch2Run, thank you for reaching out to our Forum for help. I'm really happy to see this platform grow and become a source of truth for many of our customers. I see you've been running some troubleshooting steps of your own, but I would like to also help out to get your services more in line with where they should be. In order to get started can you please send me a private message with your full name? To send a private message, click my name "ComastMarcos", then click "send message".
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@Switch2Run wrote:There is a single 9-way splitter that came with the home but there is only one cable coming in and one cable connected (out) to it that ends in the cable modem. I could easily buy something to connect those direction instead of going through the 9 way. I'll pay whatever I need to for the highest quality, could you recommend a female to female connector?
Note, the cable modem is in a completely different part of the house with all of the rj45 endpoints terminating where the cable modem is, so its not feasible to simply put the outside wire directly to the cable modem.
Yes. Bypass it and see. Here's a female to female coax connector;
https://www.amazon.com/VCE-Connector-Extension-Adapter-Connects/dp/B0107LQLQ8
Also. Please continue posting here in the open forums so that all readers here may benefit from the exchange. This is in keeping with the spirit for which these public help forums were originally intended. Thank you.
I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
I am a Customer Expert volunteering my time to help other customers here in the Forums.
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