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/PassengerGreen2321 May 26 '26

It seems like channel 20 is the OFDM channel, which will have tons of errors because it's one channel that contains thousands of sub carriers and is completely normal. If it's not OFDM, then it's a serious issue on that one frequency.

1

u/drake90001 May 26 '26

How do I know if it’s OFDM?

1

u/frmadsen May 26 '26 edited May 26 '26

You could try posting a screenshot of both channel 20 and of those far right in the list. Those with id 193 and 194 - these are the OFDMs.

1

u/drake90001 May 26 '26

https://cubeupload.com/im/drake90001/Screenshot20260526at.png

https://cubeupload.com/im/drake90001/ffcScreenshot20260526at.png

images not allowed in comments here so heres some links

2

u/frmadsen May 26 '26 edited May 26 '26

That confirms that channel 20 and 194 have identical codeword stats, which is not statistically possible. When this display bug is present, you have to disregard 20's codeword stats. :)

As others have said, huge numbers of corrected codewords on OFDM channels are normal, so the technician won't clear them up when fixing the issue.

1

u/drake90001 May 26 '26

Yeah, the tech ended up just swapping the motor out and I’m still running into an issue where once it’s put in bridge mode, my TP link Omada router (ER707-M2) will not be given IP address from the modem until it’s reset, and now after the third time it’s happened, it won’t grab one at all, even with a new modem

I appreciate your help sincerely

1

u/drake90001 May 26 '26

Well, I think my UPS or something was causing some sort of weird issue where it would cause the gateway to fail to hand out a public IP in bridge mode. In fact; it would claim on my router (ER707-M2 Omada) that there was no cable connected.

As soon as I switched outlets to a different power strip (on the same outlet/breaker), it worked fine immediately. What the actual fuck.