Regular Visitor
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21 Messages
Arris SB 8200 switching from 3.0 to 3.1
Hi,
I have had my own Arris SB 8200 3.1 modem for a few years now. It's hooked up to my Synology router. I have had this set up for a few years now. About 6 months or more ago, Comcast added, what I think, is a signal booster (ac powered) that sits near where my cable comes in from the street. This was to correct an issue I had for many years of modem rebooting during the day due to signal issues.
I have the modem out in the open in my office - so I normally can see it through out the day. I have noticed within the past 2 to 3 days that the second light on the modem from the top (first light under the power light) will constantly switch from yellow to blue - which I believe is showing an issue from going from 3.0 to 3.1.
I have power cycled the modem itself and that has not changed the issue -
Do I need to power cycle the booster as well?
Or do I need to get a new modem
Or a service call as this might be out of my control?
thanks
EG
Expert
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114.9K Messages
8 days ago
What do the modem's signal status values look like ? Try getting them here; http://192.168.100.1
Please copy all of the text in its entirety of the *Downstream Power Levels*, the *SNR's* (Signal to Noise Ratios), and the *Upstream Power Level* numbers and paste them into your next post.
Are you actually having any connectivity / speed problems ?
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user_bg1221
Regular Visitor
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21 Messages
8 days ago
Hi, I wasn't having any connectively or speed issues up until a few minutes ago when I was briefly disconnected during a Teams meeting for work. I could see the bottom (globe/internet) light of the modern disappear and eventually flicker until it reconnect about 10 - 15 seconds later
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EG
Expert
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114.9K Messages
8 days ago
Everything was within specs at that snapshot in time, except for downstream channel #39 whose SNR was too low out of spec. Other channels may be intermittently fluctuating out of spec as well. Seems that there may be some spurious noise leaking into the line(s) somewhere.
In an effort to try to obtain better connectivity / more wiggle room, check to see if there are any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/reconfigured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage from Home Depot, Target, Wal-Mart, 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, abrasions, kinks, sharp bends, or animal chews.
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 !
(edited)
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user_bg1221
Regular Visitor
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21 Messages
22 hours ago
Hi everyone,
We have had the Gigabit x2 Plan for years now and for that time I was running my own Arris SB8200 3.1 modem. I was always able to connect to 3.1 (blue light on modem)
Also, through out the years, we have had issues with signal strength and times of modem rebooting numerous times a day. The last time Comcast was out to troubleshoot - which was months ago, they installed a powered signal booster in the garage near where the cable comes in from the street.
Even with this I had many months of blue, 3.1 docsis connection on my 8200.....until.....
Very recently, approximately 3 days ago, I noticed the modem switching back and forth from 3.1 (blue) to 3.0 (yellow) connections.
It then started to have slight service interruptions (the bottom globe light on the 8200 would flicker)
Then about a day or so ago, the modem would never connect to the 3.1 signal - not even intermittently.
I went to the Xfinity store to see if getting a gateway would help
Last night I got an xb8 - (running in bridge mode) - I noticed that it did not connect to 3.1. (all channels seem to connect to 256 QAM)
I have an appointment scheduled for tomorrow.
But, I know these kinds of issues are hard to find, especially because usually my connection signals, strength, etc usually test fine while the service person is here.
What is usually the cause of the 3.1 drop outs? is it the signal booster? I haven't tried connecting with out that plugged in.
Or is this usually a situation of something beyond the cables/equipment in the home?
Thanks
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