Visitor
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8 Messages
MB8611: SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing
Motorola MB8611 randomly dropping internet. In checking the event log there are three issues that remain constant.
1) Critical: SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;
2) Critical: No Ranging Response received - T3 time-out
3) Warning: MDD message timeout
Xfinity providing 500mbs cable internet connection
The home has cable outside cable running in from original 1994 construction.
Currently running Xfinity cable directly into house line for MB8611
No splitters on my end- only the Grounding Block connection
MB 8611 feeds into EERO 6+ router
VPN is disabled
For in-house trouble shooting, I have replace the Cat 5 cabling and rebooted the MB8611 Modem several times. Event logs and connectivity reports available on request.
BruceW
Gold Problem Solver
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25.9K Messages
2 years ago
Please post following information from your modem:
Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.
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user_36883e
Visitor
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8 Messages
2 years ago
Hi Bruce,
Here is the current connection data….
Event log to follow
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user_36883e
Visitor
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8 Messages
2 years ago
And the infamous event log….
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BruceW
Gold Problem Solver
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25.9K Messages
2 years ago
Power levels and SNR values look good, but there are other values that modems do not report, and the event log suggests there is a problem communicating with Comcast's network. A lot problems with the 8611 have been reported in the Forums over the past few weeks (see https://forums.xfinity.com/conversations/search?sortKey=RECENT&q=MB8611). Neither Motorola nor Comcast seem to be doing much about it.
Just to be thorough, if you want to troubleshoot this yourself, please see Internet Troubleshooting Tips. If you can't find the problem or you'd rather have Comcast take care of it, call them at the phone number on your bill or 1-800-Comcast, or use one of the options on https://www.xfinity.com/support/contact-us/. It's not likely they can fix the problem remotely. If not, insist they send a tech out to identify the cause and correct it.
If the tech finds bad coax, splitters, amplifiers, or connections in your home (even if Comcast originally supplied them) you'll probably have to pay for the visit ($70-$100) unless you have their Service Protection Plan ( https://www.xfinity.com/support/articles/service-protection-plan, closed to customers that don't already have it). If the trouble is due to a faulty Comcast rental device or anything outside your home you shouldn't be charged.
Wish I had better news for you . . .
Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.
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user_36883e
Visitor
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8 Messages
2 years ago
Thank you Bruce, appreciate your time and insights.
We will follow your suggestions and see where this leads.
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user_36883e
Visitor
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8 Messages
2 years ago
In following Bruce's suggestions, I have contacted Motorola Customer Support.
The Rep at Motorola acknowledged that there appears to be some software glitch between Comcast and Motorola involving the 9.21.3 software patch.
As a result:
1) Motorola is working through a software fix that should be sent down through Comcast some time in February 2023
2) Motorola will replace my existing MB8611 Cable Modem with a new unit- though the firmware and components appear to be the same as my original unit.
As this time, request this Community Note remain open as the original issue still remains and the replacement modem has not been received or installed. I will post the final Connection and Event logs showing the updated system status at that time.
Onwards- JB
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