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Forum Discussion
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 ...
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.
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.
They hooked up their tester device, the XM2(?) to the line and tested it. They got over 1gbps on their device and when plugging the modem back in, the modem was working correctly at that time as well. An hour after they left, it was back to the 20-30mbps. A day later, it was back up to normal speeds, then a day after that continuing to now, it is back at 20-30 mbps. It's only when the downstream light is flashing and that channel isn't locked that this happens.
The cable goes into the house, then splits to the TVs and the modems using a MOCA splitter (they just put this in replacing a powered amplifier). This line goes directly from that house splitter to the modem.
Comcast keeps wanting to blame the modem and the tech said please replace that modem before calling us back out.
I don't have gigabit yet, was going to upgrade in the future. Only have about 350mbps. I'll try to capture that section when I get home.
Here is when it is working: https://i.imgur.com/ynacZ9j.jpg
So when they're there and its directly connected it works on your modem and on theirs. Then they unlook it and add the splitters/moca adapters (why moca?) and now it has issues.
If you absolutely need the splitters it should go like so:
incoming line--- a 2x port splitter with one connection going to the modem and then other to the rest of your tv's/splitters/moca adapters. The modem is more sensitive to problems than what your tv's/moca adapters are. So it should be first in the line and only on a 2x port splitter. You can add splitters after that to run the rest of your device but the modem should have its own dedicated line.
If you are directly connected to the line coming in without the splitters/adapters/etc, do you get gigabit?
Even when its running well, you still have a lot of erros.