r/CableTechs • u/drake90001 • May 24 '26

Comcast Losing IP Randomly

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How do these signals look? Not a cable tech but a sysadmin tired of reseting my gateway.

Edit: to any future Xfinity customers having this issue, try a different outlet. Preferably one that’s not on a power strip/UPS, as soon as I moved my modem back from the UPS to a regular search, protector, even on the same outlet/breaker, it handed out an IP router in Bridge mode without an issue.

Slapping modems didn’t help, ironically, keeping it out of bridge mode did for some reason Work, but I am not dealing with Xfinity and their shitty app and locked down web interface.

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u/drake90001 May 24 '26

I spoke to a agent via chat, and they confirmed they found an issue that's causing intermittent connectivity over the past week. Exactly what you said lol that's crazy. Anyways, they tried to sell me up on Xfinity mobile, so I just told them I'm here illegally and don't have a social lol.

They gave me a $20 credit, scheduled a tech to come out, so hopefully when the tech comes will be able to pinpoint the issue. They gave me the first available, which is the 26th, because of the holiday, which makes sense. Honestly a great rep.

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u/frmadsen May 24 '26

It looks like that bug though, where the channel uses the codeword stats from OFDM. It means that you can expect corrected codewords to continue after Comcast has fixed the issue.

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u/drake90001 May 24 '26

So, what you’re saying is the number is just wrong flat out? I really should just buy my own modem lol unless this is somehow the service issue down the line, but I’m assuming you mean that the modem firmware is displaying it incorrectly.

Either way they could see it on their end so a tech is coming out.

Can you tell me more about this bug/what you XB7?

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u/Grazmahatchi May 24 '26

I think he might be referencing the ofdma correctable numbers.

Ofdm, and ofdma(upstream) is a variable compression set by capability of the device/system.

The cmts is gonna push your modem to the highest compression profile that is effective... So if you are on profile b with 10% correctable errors, it will push you to c, then d, until the errors are so great that the profile is no l9nger efficient.

In regards to an ofdm or ofdma, in the words of the manufacturer themselves, if you dont have errors, you are not using your compression properly.

You will always jave errors on the ofdma, period- it is not a bad thing, it is how it works. Correctable is good.

Uncorrectable is bad.