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20 Messages
SB8200
I've been trying to get this issue fixed for YEARS, and nobody at Xfinity seems to be interested [Edited: "Inflammatory"]. This is the 5th modem/router setup i've tried in 2 years, and keep getting the same problem over and over, but keep getting told the problem is my equipment. I've got years worth of screenshots of my network errors and modem logs that are disregarded every time I bring it up, and not once has anyone ever even mentioned a traceroute to pinpoint the problem. I'm currently looking at hundreds of thousands of uncorrectable errors on multiple downstream channels, and literally BILLIONS of correctable errors, 634,029,053 on 1 channel alone. It's channel 193, and it says "Other" under modulation while the others all say QAM256. All of my Power (-.01 - 2.2) and SNR (42 - 44.2) numbers are all within spec on the downstream channels, and channels 1 - 4 are 6,400,000Hz on the Width and 47dBmV Power for the upstream, but channel 5 is 1,600,000 Width and 45dBmV Power. All channels on both sides are Locked. I see huge swings in speeds and almost always have at least 1% packet loss, and am currently only getting DOCSIS 3.1 on downstream. My logs show an infinite amount of "No Ranging Response received" and "Started Unicast Maintenance Ranging" t3 timeouts and SYNC Timing failures, plus a new one that says "DS profile assignment change" and this has been happening for YEARS with multiple different setups and brands....but it's somehow always been "my equipment causing the problems". I've got multiple open tickets that haven't been addressed in months, and they were all filed through the FCC [Edited: "Language"]
Ar501
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20 Messages
2 years ago
This is the status page
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Ar501
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20 Messages
1 year ago
Seems like other people have been having the exact same problems for years, and nothing ever gets done about it. Somehow you think you're entitled to take everyone's money without providing any types of resolution for well known issues. Sounds an awful lot like a tenant/slumlord scenario.
https://forums.xfinity.com/conversations/your-home-network/sb8200-modem-speed-issues/604cc2a0c5375f08cdbf02e0
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flatlander3
Problem Solver
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1.5K Messages
1 year ago
Correctable errors on an OFDM channel "other" are expected. That's protocol, hardware fixed them and they cost you nothing. The other uncorrectables are a problem. DOCSIS 3.1 can actually be slower than DOCSIS 3.0 if there are constant errors. (signal errors vs codeword errors in the protocol)
One thing you can try just for a test, and since nothing else worked, and nobody can fix it, is plugging into to where the service enters your house outside. Bypass all wiring in it entirely. See what you get then after running for a while and what the signals look like. I found a lightning/surge suppressor that was causing two DOCSIS 3.0 upstream channels to fail to lock outside my house after being told everything was fine. It was actually in a green pedestal a few feet away from the structure. My line was tagged with my address. A relic leftover from some other an install perhaps. There might be a corroded MoCA Point of Entry filter that has seen better days installed too. Maybe bad grounding as well.
Another interesting case here was a guy reported he was getting errors form an LED fixture the coax ran close too. It's odd because coax geometry is usually pretty good at keeping out noise. Plugging in before the fixture fixed the issue. Frayed coax shielding or bad crimp perhaps. Unknown.
Just something to look at. Good luck.
*Caution: Don't [Edited: "Language"] around with Electric power utilities. That's not your cable/telecom. You'll die!
(edited)
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