Visitor
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5 Messages
Issues since recent MB8600 firmware upgrade
Long story as short as possible, modem is MB8600 with 8600-19.3.15 firmware, router is Orbi RBK753 with V4.6.3.7 firmware. All was good until modem firmware was updated. Download speed has gone from 1.4 tb average to 500mb. I have defaulted both router and modem, turned off LAG on modem, to no avail. I called Comcast Tech Support who said issue is with my router. All was ok until modem firmware was upgraded.
I see a lot of errors on 2 channels on modem, all others seem ok. Suggestions please folks ?
| 28 | Locked | OFDM PLC | 37 | 690.0 | 4.9 | 42.0 | 172750204 | 0 |
| 29 | Locked | QAM256 | 38 | 429.0 | 3.9 | 42.8 | 140318 | 145930 |
Accepted Solution
TerryO44
Visitor
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5 Messages
3 years ago
Issue Resolved: so as a last resort, before calling Comcast again, I removed an inline surge suppressor from my coax cable. All modem channels now look good, even #28 and #29. After doing this, rebooting my modem, I have down load speed approaching 1tb. I then re-enabled LAG and have approx 1.3tb download speed.
Thanks everyone for your input and help, I appreciate it. I had forgotten about the in-line surge suppressor on the coax cable. Guess I’ll buy another to replace this one next.
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BruceW
Gold Problem Solver
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26.1K Messages
3 years ago
A problem with your router shouldn't cause high error counts on the modem's downstream channels. Those reflect the quality of the RF signal from Comcast, not what's going on at the Ethernet port.
Please post the downstream power level and SNR values for all channels as well as:
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BruceW
Gold Problem Solver
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26.1K Messages
3 years ago
All of that looks pretty good. The log is fairly clean for a nearly one month period, and the large number of correctables on the OFDM channel is often seen and thought not to be meaningful as long as the uncorrectable count is low.
The only problem I see is the error counts for the 429MHz channel, which frankly I'm not sure how to interpret. Likewise, I don't know what effects the firmware update might have had.
You might review Internet Troubleshooting Tips if you haven't already. Note that line impairments may exist that the modem is not able to report.
If you can't find the problem the only thing you can do is have a Comcast premise tech out to take a look. 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/. If they can fix the problem remotely 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 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.
If you have an Ethernet capable device available, what speeds do you get connected directly to the modem? Note that you need to reset or power cycle the modem every time you change the device directly connected to it's Ethernet port unless all the client devices have the same MAC address.
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