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Forum Discussion
GSquared
Oct 22, 2019Aspirant
CM1150v Intermittent Slowness and Channels not locking
Hello,
Having an issue where the CM1150v modem I have went from perfectly fine to all of a sudden flashing the downstream light repeatedly. My speeds went from 300+ to about 20-30mbps. It's been intermittent where one day it is fine, and the next it is blinking all day and slow as can be.
The coax line was reading 1Gbps+ on Comcast's line test, but this is when the modem also stopped flashing the downstream light and was working fine.
All downstream channels are locked except ID 28 when this happens, with an OFDM locked as well. 4 US channels locked. (28 is locked when it is not happening.)
Modem: CM1150v
Firmware: v2.02.04 (LAG disabled)
Thanks for any help you may be able to provide!
15 Replies
Do you have a screen snip of your modem connections page?
If you directly connect to the modem, what speeds do you get? Remove the router so we can make sure its a modem issue and not a router issue.
I'd also recommend removing any splitters, amplifiers, 90 degree elbows, extended coax runs. Check the connections to make sure they're tight. Also check your cables. Worn, corroded, bent, or cables with moisture within them can all causes intermittent connection issues.
- GSquaredAspirant
Yes, here is a screenshot of when it is not working: https://i.imgur.com/7vPL1py.jpg
In addition, I already had Comcast techs out to the house who blamed the modem. We tried directly from the modem using cat7, same thing. It's not a router issue at all. The coax was reterminated by the Comcast techs and the cat7 cable used was brand new out of the package when trying the direct connection with the same results. There are no splitters besides the main MOCA one splitting the main line through the home.
Direct connection: ~30mbps when downstream light is flashing, 300+ when it is not.
You have a lot of errors in your line. And you're directly connected to where the cable enters the house with no splitters? I'd have them check it again and have them hook up one of their modem only devices if they're blaming the modem. It potentially could be the modem but with that many errors, I'd be inclined to think its something from their box to your house.
You also didn't capture you ofdm channels. Thats the key for gigabit.