US Cable Support > Time Warner Internet Services > Defective SB6141 Modem?

Defective SB6141 Modem?

Is it possible your router has gone bad? Another unit you have kicking around that you can try for a bit?
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It has been knocked around a few times by our cats, so it could be, but what is odd is that I lost internet so I rebooted the modem and the internet started working. Yesterday I rebooted the router first and it didn't come back on still, so I rebooted the modem then it started working fine after a few mins. Both times I coudl get into both the router and the modem, but the internet would not work. The top of the SB6141 feels very warm. There are no errors in the log other than it shows that I unplugged the modem to get internet to work, but it did show "SYNC Timing Synchronization failure" only once, last time I'd say about a month ago.

reply to scififan68
Those 5000 correctables from the log is indicative of noise problems on the line, outside of the residence.
Contact TWC tech support and give them this information. They will be able to see your area to find out where the problem might be.
They may also do a truck-roll, just to make sure the drop from the pole to the house is OK.

Just because the cats knocked over the router does not make for a defective router. The problems lies elsewhere.

reply to scififan68
Do you have to remove a router from the path before logging into the modem?

And secondly, where is the poster seeing a correctable/uncorrectable errors log? The last time I looked in my modem it had a log, but it was not very detailed and didn't have that kind of information, but I think I went through the router.. It mostly showed boot-up info.
Thanks.

reply to scififan68
I also have an Arris TM602G which I could switch over with a call to TWC. I will also revert to stock firmware on my WND3700 once everyone is off the internet. We do get sporadic drops from wireless with this router, but wired is rock solid, the wireless drops could be a firmware issue. @DrDrew I was thinking the modem was causing correctable to increase, but that probably isn't right.
@Buclic On the SB6141 you can see all the signal stats including correctable and uncorrectable errors as well as signal stats on the same page.

Just to give an example of my earlier post:
5943703026+419+1739=5943705184=100% of codewords
1739 uncorrectable codewords= 0.000029% of codewords or 1 uncorrectable in 3.4 million codewords.

The uncorrectable codewords are not a problem.
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If it's important, back it up... twice. Even 99.999% availability isn't enough sometimes.

@Dr drew Yeah I know which is why I am focusing on my modem and router.

While I was sleeping it seems that my modem switched channels from 741MHz and 36MHz to 735MHz and 32MHz and when I checked the logs I got one 'T4 timeout' and two 'SYNC Timing Synchronization failure - Loss of Sync' errors. Clearly something is very wrong, I'm going to to have Tier 3 check on my arris modem for the same errors since I cannot get into it myself. Here is a picture:

Ah, well there is nothing about Fremont, or even Lincoln on the network status page, but they did finally upgrade to the new navigator last week, and I was told by the office sometime in September for Docsis 3, but I won't believe it until I see it. EDIT: Also both modems went out, seems to be something with TWC itself.

Well I got another "SYNC Timing Synchronization failure - Loss of Sync" on Sep 20 2012 15:40:09.

I wonder if my issues with my SB6141 are due to noise, I woke up today and checked my arris mta and my snr is 27, I've checked all wiring on the inside and no problems there and even hooked up my now unused SB6141 to a different port on the splitter and yeah the snr is still 27! I also had 13% correctables, I checked that with tier 3 today. I find it funny how my signal is 1dBmV and 43dBmV with an SNR of 27, while the only noticeable issue is speedtests come out lower, TWC is coming out Monday to fix it.

reply to scififan68
I bought a second SB6141 to try out and I just had a T3 timeout with jump in uncorrectable errors by millions. "Nov 23 2012 04:09:27 3-Critical R02.0 No Ranging Response received - T3 time-out"
This isn't the first error I've had with this modem, I did have a drop in the internet with these errors:
"Jan 01 1970 00:00:14 6-Notice Cable Modem Reboot due to T4 timeout
Nov 14 2012 21:58:45 3-Critical R06.0 Unicast Maintenance Ranging attempted - No response - Retries exhausted
Nov 14 2012 21:58:45 3-Critical R03.0 Ranging Request Retries exhausted
Nov 14 2012 21:58:43 3-Critical R02.0 No Ranging Response received - T3 time-out"
I've looked up those and I believe it was noise on the upstream that caused the drop. I called tier 3 about that and they said my signal is fine, but they saw a bit of a drop, and to call them if I have any other issues. That was 9 days ago, and what I'm wondering what is causing these big jumps in errors, enough to cause a T3 timeout. My signal is fine and doesn't move around more than 3db. Should I be worried or am I worrying too much?
Edit: I know that the % of errors vs total codewords is pretty small, so I shouldn't worry at all? T3's only cause drops when you have many of them, but I'm trying to determine if I should return this modem or keep it.

reply to DrDrew

reply to scififan68
I just activated a new SB6141 and am getting T3 timouts on any upload over about 2mbps for more than a few minutes. I've spent a few hours on the phone with L3 and finally managed to convince one that there was an issue. I only get 1 T3 timeout in my logs per disconnect. The modem recovers in a minute.

Signal levels are fine. All 4 bonded downstream channels show a snr of 36-37dB, power is 0-1dBmV. My upstream is 48dBmV. There is very little fluctuation in the numbers at all. None of the techs I've talked to have seen anything at all wrong signal-wise but I have a truck roll scheduled for Sunday morning.

I haven't any disconnects since 9 days ago, but the correctable and uncorrectable errors are climbing, a few channels have over a million more errors. Whats funny is that my internet speeds are fine and nothing disconnecting right now, but you never know.

reply to scififan68
Just an FYI: your downstream power is supposed to be within the range of -10db and 10db. 0 is "perfect" for downstream strength.