Recent network upgrade and now unreliable internet
About a week ago Mediacom performed an upgrade on the network and things haven't worked reliably since. I made a phone call and a day later two nice young men came out and said they knew what the problem was and replaced something that looked like a filter but they had another name for it. Then they left. And the problem persists. A day later I'm fishing through the cable modem logs and I send them to the nice tech that came out and he claims he knows the problem is. It's that my cable modem is not one of the "approved" cable modems and we need to switch it.
Cable modem = MB8600
So he's coming out tomorrow with a Mediacom modem and I guess we will see. But I do a quick google search after our chat and find a similar human with a similar problem and it doesn't seem like a modem issue to me.
https://www.reddit.com/r/Mediacom/comments/1spbr1h/docsis_31_mb8600/
I ran the logs and the Upstream/Downstream connection status from the cable modem through an AI and it gave the following report:
Experiencing frequent brief internet drops and instability. Modem logs show the same Critical and Warning errors repeating every ~10-15 minutes:
- Critical (3): UCD invalid or channel unusable;CM-MAC=REDACTED Pretending to maintain privacy;CMTS-MAC=--REDACTED--;CM-QOS=1.1;CM-VER=3.1;
- Warning (5): DBC-REQ Mismatch Between Calculated Value for P1.6hi Compared to CCAP Provided Value;...
Current Signal Levels (as of today):
Downstream Bonded Channels (all Locked):
- Powers: 5.8 – 6.8 dBmV (good)
- SNR: 44.0 – 45.6 dB (excellent)
- Mostly zero uncorrectables.
Upstream Bonded Channels (2 channels Locked):
- Powers: 35.0 – 35.3 dBmV (good)
Despite solid signal levels, the upstream channel configuration errors persist.
Please investigate the CMTS for provisioning issues, upstream noise on higher channels, or node problems.
End of AI report.
Let's just say I'm skeptical I will be getting a reliable solution tomorrow when we try a new modem. I've sent this message to Mediacom via email and Facebook messenger. I'll update as I learn more.
I'm writing this as documentation for some other poor soul out there in the future who runs into this problem. In the meantime if someone out there has something to try let me know. Also, if someone out there really did fix their issues with a modem change, also let me know.