Visitor
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2 Messages
Cable Modem Motorola MB8600 downstream blue light blinking
I recently purchased an MB8600 to replace my previous modem that stopped working. I noticed that the blue downstream light on the MB8600 always starts blinking shortly (hours) after each restart. By that I mean with each restart, the connection is established fine, and all lights are solid. But hours later, the downstream blue light starts blinking, and will keep doing so until/unless I restart the modem. The manual says a blinking blue light means it's trying to negotiate channels. But my connection seems to be up, and the speed looks normal for my plan.
Does anybody have a similar problem? Should I request help from Comcast to see what's going on?
Here's my current connection details. And yes, the blue light is blinking at the moment.
Thank you very much for your insight!
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EG
Expert
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103.5K Messages
2 years ago
The upstream power is too high / out of spec, and the SNR on some of the downstream channels is too low / out of spec. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, the un-bonding of channels, and blinking indicator lights.
In an effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1000 MHz, bi-directional, and no gold colored garbage from Radio Shack, Home Depot, Target, etc. Splitters should be swapped with known to be good / new ones to test.
Also check the coax cable for any damage such as cuts, nicks, kinks, sharp bends, etc.
If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two-way splitter connected directly off of the drop from the street / pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.
Good luck with it !
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user_696942
Visitor
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2 Messages
2 years ago
Thank you very much for your suggestions, EG!
This is a direct cable run from the entry point on the side of my garage and then directly feeds to my cable modem. In that sense, there aren't any splitters in the path that I control.
Two facts that may be red herring or may have some thing to do with it:
1) my neighbor just got their Comcast service started (from the same green box in the yard). That's the same time my old modem died, and I had to buy a new one. Coincidence? Maybe.
2) we've been baking in 100+ degree heat here in Atlanta, Georgia, and there is a stretch of the cable that's directly baked in sunlight. Ouch. I used to remember that (upstream) signal levels really struggle in summer.
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EG
Expert
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103.5K Messages
2 years ago
This is a line / connection quality problem, not the modem.
If there is nothing more that can be done to improve the connection quality, then you'll need a tech visit as stated.
Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home. And if the problem is found to be on their side of the demarcation point, there will not be any charge.
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CCYvonne
Contributor
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340 Messages
2 years ago
Hi, @user_696942, Thank you for taking the time to reach out to the Xfinity Digital Care Team!
If you are still experiencing service issues please send us a DM! I'd love to help.
You can send me a DM by following these directions:
To send a direct message you may need to:
Click "Sign In"
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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