If I had to guess, about every 2.5 years I find myself having to replace the cable modem. I am in Gwinnett County, GA and have the Performance Internet service and no other Comcast service. I own my own modems and the current model:
Model Name: SB6141
Vendor Name: Motorola
Firmware Name: SB_KOMODO-1.0.6.14-SCM01-NOSH
Boot Version: PSPU-Boot(25CLK) 1.0.12.18m3
Hardware Version: 7.0
Serial Number: 3747813156242447xxxxxxxx
Firmware Build Time: Mar 6 2014 15:23:55
Signaling information (pulled from modem):
Downstream Bonding Channel Value
Channel ID 1 2 3 4 5 6 7 8
Frequency 573000000 Hz 579000000 Hz 585000000 Hz 591000000 Hz 597000000 Hz 603000000 Hz 609000000 Hz 615000000 Hz
Signal to Noise Ratio 38 dB 38 dB 38 dB 38 dB 38 dB 38 dB 38 dB 38 dB
Downstream Modulation QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256
Power Level
The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading
6 dBmV 6 dBmV 5 dBmV 6 dBmV 5 dBmV 5 dBmV 5 dBmV 5 dBmV
Upstream Bonding Channel Value
Channel ID 7 8 9
Frequency 34800000 Hz 27900000 Hz 21000000 Hz
Ranging Service ID 11083 11083 11083
Symbol Rate 5.120 Msym/sec 5.120 Msym/sec 5.120 Msym/sec
Power Level 35 dBmV 34 dBmV 33 dBmV
Upstream Modulation [3] QPSK
[3] 64QAM
[3] QPSK
[3] 64QAM
[3] QPSK
[3] 64QAM
Ranging Status Success Success Success
Signal Stats (Codewords) Bonding Channel Value
Channel ID 1 2 3 4 5 6 7 8
Total Unerrored Codewords 2205431104 2204485019 2204468653 2204476916 2204461445 2204462441 2204463524 2204461523
Total Correctable Codewords 1 0 0 10 5 21 15 13
Total Uncorrectable Codewords 637 571 584 490 649 638 633 745
Problem:
At almost random times of the day, days of the week I can be watching a video on any of the free video websites and everything can seem OK. Then I might open a webpage and the two actions will cause bandwidth and latency to nosedive. The streaming video might be 2-3Mbps at best during normal observations with Comcast DNS pings showing latency ~15ms (12-17).
When the problem occurs, video stalls and latency skyrockets to 700-3,000ms and continues until I close one of the two activities. I've tested other DNS to insure Comcast DNS wasn't an issue, other operating environment (Linux Mint, OSX, Win7/8.1), and a variety of multimedia web sources and combination.
During experienced events I've rebooted the modem, and all connected networking equipment (e.g. Linksys router) and observations are made during events when connected wirelessly and with wired connections.
This recent set of events comes shortly after the latest modem firmware update. I hadn't actually realized it until I began paying closer attention to when I observed the problem started and discovery that a firmware update took place (see above).
Now I am not sure it is a modem dying vs. a firmware issue. BTW, no wireless functionality on this modem, and no open access to Linksys to suggest why the absurd experienced latency issues. I cannot even suspect something is failing here vs. maybe something else taking place (traffic shaping, etc.).
I do not watch movies or TV via Internet, do not download stuff (e.g. multimedia, software, a la NNTP etc.) so I know I am not reaching any cap (350GB/month cap and always well below it).
Anyone got any ideas, suggestions, etc? I've already bought a replacement modem, but trying to stave off having to go through tech support to get them to take the new serial number for full service.
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