Visitor

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3 Messages

Friday, February 27th, 2026 2:34 AM

Closed

Low uplink speed: 10kbps

That's not a typo: 10-20 thousand bits per second.  There was trouble reported in our Chicago area today, but Comcast claims it is repaired.  Download speed is fine, >150Mbps, however, upload should be 15Mbps (per plan, and has been in the past).  It is so slow that pages (like this one) load slowly, waiting for responses from the browser.  Xfinity's own speed test simply reports "Error" on the uplink test.  Other tests (for example: Google) show intermittent uplink, settling anywhere from 0-50 kbps.

I've been through the bot loop several times, but the line of questions never arrives at the problem. The bot seems unable to do an uplink speed test.   I've probed the modem (ARRIS DOCSIS 3.0 Cable Modem)​, and all down and up channels are locked and have good signal strength.  

Oddly, Comcast claims there is no longer trouble in my area, yet there is no place that I can find to report trouble., and no way to reach a human.

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Visitor

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3 Messages

28 days ago

After a visit by a tech today, and followup work on the distribution system by another, the poor uplink now seems to be fixed for me, and also for my neighbors.  My Arris SB6190 modem had been operating uplink channels at ~55dbmV, and have now dropped back to ~45dbmV.  I now have 15-30Mbit/s up link, instead of 0.02Mb/s.

Visitor

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3 Messages


I should have mentioned that this morning, when I entered the bot loop again, it DID say there was trouble detected, and offered me a visit from a tech.  That visit showed that the problem affected the whole neighborhood, and triggered further action that fixed the problem.  Tech support is fine. It is getting them engaged that is hard.

Official Employee

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512 Messages

27 days ago

Hey @user_2ng9od! Thanks for reaching out to us on the Xfinity Forums! I'm glad to hear that the issue has been resolved by a tech who was able to get the maintenance crew involved. If you ever need help in the future, please feel free to start a new post as we will now close this thread!

 

(edited)

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