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dwellersire

join:2013-08-05
Alexandria, VA

2 edits

SB6141 constant semi-random power resets

Mods please delete duplicate anon post if you see it.
Mod Note: Hoping this is the correct topic, it has been closed and cross referenced.
---> »[Connectivity] Constant modem rebooting


Alexandria VA
SB6141 cable modem constantly resets
Constant, semi-random disconnects ever since the day I got it. 5-20 per day. Seems to do it slightly more often when under heavy use.

Model Name: SB6141
Vendor Name: Motorola
Firmware Name: SB_KOMODO-1.0.6.10-SCM00-NOSH
Boot Version: PSPU-Boot(25CLK) 1.0.12.18m3
Hardware Version: 7.0

Cable modem plugged into power strip. Behind one splitter. Goes to wireless router.

=======LOG SECTION=======
Aug 05 2013 21:49:16 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
Aug 05 2013 20:02:46 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 05 2013 18:59:08 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
Aug 05 2013 18:03:33 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 05 2013 16:26:37 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 05 2013 02:23:49 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 05 2013 01:14:14 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 05 2013 00:36:50 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 04 2013 23:52:20 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 04 2013 23:50:59 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
======SIGNAL SECTION======
Downstream Bonding Channel Value
Channel ID 1 2 3 4 5 6 7 8
Frequency 645000000 Hz 651000000 Hz 657000000 Hz 663000000 Hz 669000000 Hz 675000000 Hz 681000000 Hz 687000000 Hz
Signal to Noise Ratio 38 dB 39 dB 39 dB 38 dB 39 dB 39 dB 39 dB 38 dB
Downstream Modulation QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256
Power Level
8 dBmV 8 dBmV 8 dBmV 8 dBmV 8 dBmV 8 dBmV 8 dBmV 7 dBmV

Upstream Bonding Channel Value
Channel ID 1 2 3
Frequency 29600000 Hz 24800000 Hz 36000000 Hz
Ranging Service ID 14324 14324 14324
Symbol Rate 5.120 Msym/sec 2.560 Msym/sec 5.120 Msym/sec
Power Level 37 dBmV 36 dBmV 38 dBmV
Upstream Modulation [3] QPSK
[3] 64QAM
[3] QPSK
[2] 16QAM
[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 101750927 100783890 100791292 100799389 100775195 100777160 100776723 100775267
Total Correctable Codewords 0 8 0 0 48 10 33 48
Total Uncorrectable Codewords 604 536 1328 1404 1462 1475 1402 1561
=======================
Edit: I just tried plugging it directly into the outlet. I figured worth a shot.


andyross
Premium,MVM
join:2003-05-04
Schaumburg, IL

If you still have issues, also double-check the barrel connector in the back to make sure it's fully seated.


dwellersire

join:2013-08-05
Alexandria, VA

Same issue while plugged directly in the outlet. Just unscrewed and rescrewed connector. Can't say if it worked or not for several hours at least. I can confirm that it really only does the power reset while I am actively using the internet (even web browsing).



netcool
Premium,VIP
join:2008-11-05
Englewood, CO
kudos:106
reply to dwellersire

said by dwellersire:

Cable modem plugged into power strip.

I would advise against anyone plugging their modem into power strips / surge protectors. They often use poor components and do more harm than good.


elkido122

join:2011-02-23
Folsom, CA
reply to dwellersire

So what would you recommend someone not use one and get a surge and fry a modem?? Lol



Wayne99021
Premium
join:2004-12-28
Mead, WA
kudos:1
reply to netcool

I would agree if you buy a surge protector at the local dollar store it can cause more problems than it cures, but if you buy a good brand like a Ditek or similar it's well worth the money.
I have all my computer gear on a CyberPower UPS and never worry about it.
You get what you pay for definitely comes into play with surg protectors and UPS units.



netcool
Premium,VIP
join:2008-11-05
Englewood, CO
kudos:106
reply to elkido122

Sorry that was poorly worded. I meant you should not run your coax through a surge protector / power strip.



Wayne99021
Premium
join:2004-12-28
Mead, WA
kudos:1

I totally agree with that.


dwellersire

join:2013-08-05
Alexandria, VA
reply to dwellersire

Tried both suggestions so far and same issue persists. Does anybody have a best guess?



jaynick
lit up
Premium
join:2001-02-06
Sterling Heights, MI
kudos:2

another possibility is an electrical outlet going bad even one in the chain before the one you are at.



Wayne99021
Premium
join:2004-12-28
Mead, WA
kudos:1

1 recommendation

You beat me to it, I was thinking the same thing.
You could contact your electric company and see if you could check out a voltage quality recorder and see what is going on with your power. If not, you should be able to rent one for a couple days.
They are small, easy to use and would eliminate or prove you have a power problem not a hardware problem.



adamy

@comcast.net
reply to dwellersire

The same thing happens with my 5 day old SB6141. I don't think it's a power issue; mine is plugged into a UPS and the previous modem had worked flawlessly. Based on all problems people are reporting I think they're all crap and am returning mine.



jaynick
lit up
Premium
join:2001-02-06
Sterling Heights, MI
kudos:2
Reviews:
·Comcast

1 recommendation

said by adamy :

The same thing happens with my 5 day old SB6141. I don't think it's a power issue; mine is plugged into a UPS and the previous modem had worked flawlessly. Based on all problems people are reporting I think they're all crap and am returning mine.

Both Wayne99021 See Profile and myself use a SB6141 without issue and it's rock solid. My has been online without fail for 46 days.


Wayne99021
Premium
join:2004-12-28
Mead, WA
kudos:1

Like jaynick mine has been rock solid for a year without a flicker.
So saying all SB6141s are crap is not true.
Maybe the newer 6141s have gotten some bad components, which is possible and can happen to anything electronic.
I had read nothing but great reviews of the Zoom 5341J modems so bought one. Never did work right and died in less than a week. So things happen.



adamy

@comcast.net

Well that's good to know, maybe I'll do an exchange instead of a return. Out of curiosity, would one of you please visit »192.168.100.1/cmSignal.htm and tell me what your Downstream Power Levels are? All 8 channels of mine always say 0 dBmV which I find peculiar.



jaynick
lit up
Premium
join:2001-02-06
Sterling Heights, MI
kudos:2

everybody's DS power levels vary according to plant conditions for the area amongst other factors. as long as they are within specs then no worries. Yours at 0 is optimal.


dwellersire

join:2013-08-05
Alexandria, VA
reply to jaynick

said by jaynick:

another possibility is an electrical outlet going bad even one in the chain before the one you are at.

Testing now by running a 12AWG extension from another circuit. I'm leaning toward the issue being the modem being bad like adamy's.

n_w95482
Premium
join:2005-08-03
Ukiah, CA

It could also be a bad power supply. They're not exactly the highest-quality things out there. If you have another one with the same voltage/polarity and enough current, you can try swapping it.
--
KI6RIT



Tobin

join:2003-09-21
Burlingame, CA
kudos:1
reply to adamy

said by adamy :

Well that's good to know, maybe I'll do an exchange instead of a return. Out of curiosity, would one of you please visit »192.168.100.1/cmSignal.htm and tell me what your Downstream Power Levels are? All 8 channels of mine always say 0 dBmV which I find peculiar.

Downstream power should be as close to 0 as possible, but many people are around +-/10dBmV and don't have connection issues.

Downstream SNR, >35dB, but again I've seen a bit lower than that without issues.

Upstream power happiest between 40-45dBmV.

Mine for example: »dl.dropboxusercontent.com/u/2264···gnal.png

dwellersire

join:2013-08-05
Alexandria, VA
reply to n_w95482

said by n_w95482:

It could also be a bad power supply. They're not exactly the highest-quality things out there. If you have another one with the same voltage/polarity and enough current, you can try swapping it.

Worth a shot. This is why I keep old ac adapters even if I throw something away. You never know when they will come in handy. I just happened to have one.

n_w95482
Premium
join:2005-08-03
Ukiah, CA

Years ago, I worked at a local ISP that resold Sonic.net DSL. We were using some Zoom modem at the time (forgot the model, just a plain modem). The modems themselves seemed fairly reliable, but the power supplies were crap. We must have sent out a couple of dozen replacements at least. They switched models/brands after I left, no idea if those were any better.
--
KI6RIT


andyross
Premium,MVM
join:2003-05-04
Schaumburg, IL

Also, it seems most of the cable modems are pretty much the same as far as power supplies. 12V @ 750ma or 1A, center positive post.

When I got my 6120, I continued to use the supply from my 5120 because the cord on it was long enough to reach. The 6120's was too short. Both are 12V@750mA.

I recently changed to a Zoom 5341J, and the cord is WAY too short. It's rated at 1A instead of 750mA, so I'm using it, but had to add a power strip to make it reach.


dwellersire

join:2013-08-05
Alexandria, VA
reply to dwellersire

Still no go with the new ac adapter. Will call the tech support for the modem. Thanks all.