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user_xxlt6b
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Sunday, April 6th, 2025 9:09 PM

High amount of correctable/ uncorrectable errors on only a small range of modem channels

Modem frequencies from approx. 501 - 531 seem to have the highest amount of errors within a short time, by this I mean inside of only a few hours of uptime ( Motorola MB8600 ). The errors are in the double digit thousands. Trouble shooting has been done to this point, new cables, new splitters, etc,,even swapped out to a different modem, same situation. Downstream power levels are the relative same. The Downstream signal levels are within 3 Db of each other and the Upstream is also well inside spec. The drop line is over 10 years old ,underground. I suspect it’s outside equipment related, however, I don’t work for Xfinity

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Updated 

10 days ago

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XfinityWilliam

Official Employee

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1.2K Messages

10 days ago

 

user_xxlt6b

It sounds like you've done quite a bit of troubleshooting already! Given the persistent errors in the 501-531 MHz range and the fact that you've swapped out modems and cables, it's likely that the issue is indeed related to external equipment or the drop line itself. Here are some steps you can take:

Check for Firmware Updates:

Ensure your modem's firmware is up to date. You can check the firmware version by logging into your modem's admin page (usually at 192.168.100.1) and navigating to the software section.
Inspect Event Logs:

Look at your modem's event logs for T3 or T4 timeouts, which indicate signal issues from the ISP. If these are present, it further supports the likelihood of external equipment issues.

 

2

user_xxlt6b

2 Messages

Greetings, modem firmware is the most current available, event log as far as T3/T4 timeouts are concerned are not the issue. This whole situation started around the time Xfinity sent a message stating that work was going to be done in the area, prior to this, the event log had the usual entries of no concern, the correctable/ uncorrectables were flat zero on all frequencies, the D/S numbers were all around 0dB (+ or - ) 1-1.5,,,,power levels were 43.3 and the U/S numbers were also well within spec. @ 41-42.5 respectively. I don’t use junk splitters and my cables are either Commscope or PPC Perfectflex 6 series, one final note, the cables under the house are not subject to the elements , connectors are new Belden EX6XL Plus. I still think it’s either the drop or somewhere in the plant area. Thank You for your time

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10 days ago

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XfinityMartyR

Official Employee

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2K Messages

 

user_xxlt6b We can take a closer look at your signal levels from here. Please send us a direct message. 
 
 
 
To send a "Direct Message" message:
• Click "Sign In" if necessary
• Click the "Direct Message" icon
• Click the "New message" (pencil and paper) icon
• Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list which appears. The "Xfinity Support" graphic replaces the "To:" line
• Type your message in the text area near the bottom of the window
• Press Enter to send it

 

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10 days ago

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EG

Expert

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109.8K Messages

10 days ago

@XfinityWilliam 

FWIW. T3's and T4's can be caused by CPE / premises internal wiring / premises connection impairments as well.

(edited)

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