dslreports logo
site
 
    All Forums Hot Topics Gallery
spc

spacer




how-to block ads


Search Topic:
uniqs
1477
share rss forum feed

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

[Connectivity] I hate cold weather

I hate it when the temperature gets near 0. I always run into upstream issues. Connection goes dead, but I can see the link light still blinking as normal for awhile. Then it goes into a reconnect, but sits at upstream blinking for about 5 minutes. I've had this issue for several years and several different modems. It's especially bad this year with the unusually cold weather. Upstream signals are all normal, around 41-42.

Time Priority Description
Tue Dec 24 06:15:35 2013 Critical (3) REG RSP not received;CM-MAC=00:1c:7b:ce:92:91;CMTS-MAC=00:01:...
Tue Dec 24 06:15:29 2013 Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC...
Tue Dec 24 06:15:16 2013 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:1c:7b:ce...
Tue Dec 24 06:15:09 2013 Warning (5) B-INIT-RNG Failure - Retries exceeded;CM-MAC=00:1c:7b:ce:92:9...
Tue Dec 24 06:15:09 2013 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:1c:7b:ce...
Tue Dec 24 06:12:42 2013 Warning (5) B-INIT-RNG Failure - Retries exceeded;CM-MAC=00:1c:7b:ce:92:9...
Tue Dec 24 06:12:42 2013 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:1c:7b:ce...
Tue Dec 24 06:10:00 2013 Critical (3) Received Response to Broadcast Maintenance Request, But no Un...
Tue Dec 24 06:09:28 2013 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Tue Dec 24 02:46:18 2013 Critical (3) REG RSP not received;CM-MAC=00:1c:7b:ce:92:91;CMTS-MAC=00:01:...
Tue Dec 24 02:46:12 2013 Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC...
Tue Dec 24 02:46:00 2013 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:1c:7b:ce...
Tue Dec 24 02:45:39 2013 Warning (5) B-INIT-RNG Failure - Retries exceeded;CM-MAC=00:1c:7b:ce:92:9...
Tue Dec 24 02:45:39 2013 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:1c:7b:ce...
Tue Dec 24 02:42:40 2013 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries...
Tue Dec 24 02:42:40 2013 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Tue Dec 24 02:42:40 2013 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream ...
Tue Dec 24 02:42:40 2013 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries...
Tue Dec 24 02:42:40 2013 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Tue Dec 24 02:42:22 2013 Critical (3) Received Response to Broadcast Maintenance Request, But no Un...
Tue Dec 24 02:42:14 2013 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Tue Dec 24 01:55:57 2013 Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC...
Tue Dec 24 01:55:44 2013 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:1c:7b:ce...
Tue Dec 24 01:55:09 2013 Warning (5) B-INIT-RNG Failure - Retries exceeded;CM-MAC=00:1c:7b:ce:92:9...
Tue Dec 24 01:55:09 2013 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:1c:7b:ce...
Tue Dec 24 01:52:04 2013 Warning (5) B-INIT-RNG Failure - Retries exceeded;CM-MAC=00:1c:7b:ce:92:9...
Tue Dec 24 01:52:04 2013 Critical (3) No Ranging Response received - T3 time-out;CM-MAC=00:1c:7b:ce...
Tue Dec 24 01:49:06 2013 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries...
Tue Dec 24 01:49:06 2013 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...
Tue Dec 24 01:49:06 2013 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream ...
Tue Dec 24 01:49:06 2013 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries...
Tue Dec 24 01:49:06 2013 Critical (3) Started Unicast Maintenance Ranging - No Response received - ...

©2011 Zoom Telephonics, Inc. All rights reserved.


Johkal
Cool Cat
Premium,MVM
join:2002-11-13
Happy Valley
kudos:10
Have a question or just sharing?

andyross
Premium,MVM
join:2003-05-04
Schaumburg, IL
I guess more of a rant.


kataan
RIP my love.
Premium
join:2003-04-22
Greenacres, WA
I had the same problem. They replaced my drop and it went away.


fonzbear2000
Premium
join:2005-08-09
Saint Paul, MN
reply to andyross
We've had highs in the single digits for quite a few days now and there are no problems with our connection. In fact, for the 10+ years we've had Comcast, we've never had problems during winter. You might want to call Comcast and let them know what's happening if you haven't already done so.
--
I love my autistic brother so much!

andyross
Premium,MVM
join:2003-05-04
Schaumburg, IL
reply to andyross
I do have a valid question now.

This happened again today (upstream went dead for about 15 minutes, with the modem blinking the US light), and I was able to try running OnDemand on the cable box. It worked fine.

So, why would the modem fail but OnDemand work? I know they are different frequencies, so I wonder if there is a split somewhere upstream? Maybe that separates the cable box upstream from the modem upstream, and it's the modem upstream going bad? Either that, or the modem suddenly needed more signal than it could send, but the cable box could do more, being a simpler modulation.

Upstream signals both about an hour before the outage (when I last checked), and just afterwards are about the same, around 41dB.


gar187er
I do this for a living

join:2006-06-24
Dover, DE
kudos:4
ondemand uses a smaller more tolerable upstream QAM, capable of being used through a decent amount of noise, so its generally lower in the spectrum then the docsis QAMs
--
I'm better than you!


flwpwr

@comcast.net
because the wire that has the problem/damage does not go to the on demand boxes, as in the outlet you're using for the modem maybe?

Because you have legacy boxes that use a QPSK carrier at a different frequency [X1 is different it uses the modem carriers], becasue the noise that is interrupting the modem is not on the STB return?

Could be a lot of things, I'd clear a path to the outlet the modem is on in the house if you need to, and an outside path to the ground block and splitters [or inside if you have a smart panel internal splitter] and then call in a trouble call and then ask the guy to replace the outlet if he does not find a problem on that line with the meter, visual inspection [I usually just put new fittings on anyway but who knows what your tech will do]

pghpooh

join:2003-03-05
reply to andyross
I had a cold weather problem a few weeks ago. Over the past 2 years the drop was replaced, all inside coax, modems, etc. Comcast insisted the cold weather problem was mine.
In early Dec I was on a call about another matter to Comcast and in passing I mentioned the cold weather problem.
The tech reset my modem, then,,, she said she will reset the Comcast eq. The modem has been reset, rebooted, firmware updated in the past. She said ok and did it anyway. After the Comcast eq reset, all is well and so far for the past few weeks no slowdowns. Temps have been all over the place from the 40's to the low teen's.
Call Comcast and request that modems be reset, rebooted, ets at both ends. That might help.

andyross
Premium,MVM
join:2003-05-04
Schaumburg, IL
reply to flwpwr
said by flwpwr :

because the wire that has the problem/damage does not go to the on demand boxes, as in the outlet you're using for the modem maybe?

This is an apartment with just one cable outlet. There is a splitter there, with one leg going direct to the modem, all inside at (near) room temperature.


telcodad
Premium
join:2011-09-16
Lincroft, NJ
kudos:15
reply to andyross
Click for full size
eMTA Levels at 0 degs F
Click for full size
eMTA Levels at 27 degs F
For me, when the outdoor temperatures were near 0 degs F this morning, I found that the downstream carrier levels displayed by my ARRIS TM822G eMTA were about 8 dB higher than usual (but the SNRs dropped almost 1 dB). The upstream carrier levels only decreased by 1 dB or less.

Later this afternoon, when the temperature had risen to about 27 degs F, they were basically back to normal.


FureverFurry
Premium
join:2012-02-20
Wyoming, MI
Reviews:
·Vonage
·Comcast
FWIW, over here in the frozen wasteland (aka Michigan), my signals on the Arris WMB760a were like yours, if not worse a couple of days ago with windchill of -10F -- saw SNR of less than 15 before an outage!! However, someone responded that CC had a "damaged fiber". At any rate, I've had 3 outages since 12-22. Can't wait to see my signals tonight when we are expected to have -30F windchill. :-(

Brocktoon

join:2009-08-11
Fairless Hills, PA
reply to telcodad
said by telcodad:

For me, when the outdoor temperatures were near 0 degs F this morning, I found that the downstream carrier levels displayed by my ARRIS TM822G eMTA were about 8 dB higher than usual (but the SNRs dropped almost 1 dB). The upstream carrier levels only decreased by 1 dB or less.

Later this afternoon, when the temperature had risen to about 27 degs F, they were basically back to normal.

I see a similar issue on my street as well. My downstream usually runs around +1 to +2 db. As soon as the outside temp drops below ~ 25-27F the downstream frequencies above ~400 MHz+ jump over 10 db and the SNR starts to tank. There is no change in the uopstream levels. It effecting at least some of my street as my neighbors see it as well. The lower 100-300 MHz downstreams aren't affected as I can check them on my little DTA TV box. As the temps drop below 10F on the past day or so, the power levels get near +13 and the internet becomes basically useless. My 700MHz+ TV channels also start dropping out. An attenuator was no help either. It makes the downstream levels drop back into range, but the dowstream SNRs don't change with the attenuator and are still horrible. As soon as the outside temp warms back up near 25-27F, the levels jump right back down to +1 to +2 db.

I've had multiple Comcast techs out to my house and they confirm they see the jumps, and it's outside somewhere effecting my side of the street. Yet, there seems to be no solution. I guess the good news is that it rarely gets below 10F here north of Philly, although I'll pretty much be without internet come this Tuesday when the Northeast gets this crazy temp drop


Streetlight

join:2005-11-07
Colorado Springs, CO
If you want you can check out my two posts about similar wild swings in signal levels and S:N ratios with affects on different frequencies on the 2nd page of

»[Connection] Bad node / outside line again...

The problems I had occurred during the change of seasons - in May when things began to warm up and in November when it got cold. The two guys who worked to solve the problem came in the dark in November and it was cold and windy. When they discovered there was a problem downstream they worried that they might have to replace the buried line to my pedestal going back who knows how far. The line tech that came was on call and came on his time off. Since then both TV and Internet have been rock solid.

By the way, my signal levels have been pretty stable. Downstream vary about 2 dBmV and upstream about 1.5 dBmV with temps ranging between 45 to 60 deg F during the day and down to -20 deg F at night, although we've been more typically down to 0 deg F at night. So I don't understand those massive changes in signals. Something strange is going on and may take a lot of time to find if the line techs aren't lucky.
--
There is nothing more deceptive than an obvious fact.

Sherlock Holmes in
The Boscombe Valley Mystery
A. C. Doyle
Strand Magazine, October 1891

andyross
Premium,MVM
join:2003-05-04
Schaumburg, IL
reply to andyross
It's -15F out, and my downstream is poor, compared to normal. It's actually up a tiny bit from about 30 minutes ago. My SNR is typically around 37-38, and Power is typically about 1dB higher.

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 8 693000000 Hz 1.2 dBmV 33.8 dBmV 354 408
2 Locked QAM256 1 651000000 Hz -0.3 dBmV 33.4 dBmV 571 326
3 Locked QAM256 2 657000000 Hz 0.0 dBmV 33.7 dBmV 763 387
4 Locked QAM256 3 663000000 Hz 0.4 dBmV 34.3 dBmV 2102 731
5 Locked QAM256 4 669000000 Hz 0.5 dBmV 34.1 dBmV 1005 398
6 Locked QAM256 5 675000000 Hz 0.0 dBmV 34.0 dBmV 2117 642
7 Locked QAM256 6 681000000 Hz 0.1 dBmV 34.0 dBmV 4554 2229
8 Locked QAM256 7 687000000 Hz 0.4 dBmV 34.1 dBmV 404 354


B_Top

join:2007-07-17
reply to andyross
Click for full size
It is -21 right now here in Andover,MN and I am not having any problems with the cold.

andyross
Premium,MVM
join:2003-05-04
Schaumburg, IL
reply to andyross
It's not much warmer out, but it is sunny. Signals continue to slowly improve:

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 8 693000000 Hz 1.9 dBmV 35.6 dBmV 364 408
2 Locked QAM256 1 651000000 Hz 0.3 dBmV 35.1 dBmV 623 326
3 Locked QAM256 2 657000000 Hz 0.7 dBmV 35.6 dBmV 798 387
4 Locked QAM256 3 663000000 Hz 1.0 dBmV 35.9 dBmV 2203 754
5 Locked QAM256 4 669000000 Hz 1.1 dBmV 36.1 dBmV 1027 398
6 Locked QAM256 5 675000000 Hz 0.7 dBmV 35.9 dBmV 2223 642
7 Locked QAM256 6 681000000 Hz 0.8 dBmV 35.9 dBmV 4796 2244
8 Locked QAM256 7 687000000 Hz 1.2 dBmV 35.9 dBmV 418 354


SHoTTa35

@kfvaluation.com
reply to andyross
Umm 0.0dBmV is PERFECT signal so 1.0 is worse than 0.5.

Your SNR is bad yes as you want that higher. So 35 is getting better but no idea why signals would be better but SNR gets worse. Must be some moisture or breakage on the line and the higher input power overpowers the noise caused by the leak?


Darknessfall
Premium
join:2012-08-17
kudos:6
Reviews:
·Frontier Communi..
·Comcast
·AT&T U-Verse
When we had the cold over the weekend here(CT) my downstream went up to about 7 and upstream went down to about 38. SNR stayed the same(actually was just slightly better).

Right now as we have our brief warm up I have these signals.

Power Level: Signal to Noise Ratio:
Channel 1: -0.6 dBmV 40.5 dB
Channel 2: -0.4 dBmV 40.4 dB
Channel 3: 0.0 dBmV 40.3 dB
Channel 4: -0.4 dBmV 40.3 dB
Channel 5: -0.4 dBmV 40.3 dB
Channel 6: 0.5 dBmV 40.4 dB
Channel 7: -0.9 dBmV 39.9 dB
Channel 8: -0.6 dBmV 39.9 dB

Power Level:
Channel 1: 39.5 dBmV
Channel 2: 41.5 dBmV
Channel 3: 42.0 dBmV
Channel 4: 0.0 dBmV

andyross
Premium,MVM
join:2003-05-04
Schaumburg, IL
reply to SHoTTa35
said by SHoTTa35 :

Umm 0.0dBmV is PERFECT signal so 1.0 is worse than 0.5.

Your SNR is bad yes as you want that higher. So 35 is getting better but no idea why signals would be better but SNR gets worse. Must be some moisture or breakage on the line and the higher input power overpowers the noise caused by the leak?

I wonder if some amp is somewhat weak as it gets cold and keeps trying to push it's gain up, causing the extra noise despite the slightly weaker signal.

andyross
Premium,MVM
join:2003-05-04
Schaumburg, IL
reply to andyross
Saw my Zoom had the blinking US light today for the first time. (I don't normally see it as I keep it covered to reduce the light in the bedroom.) I reset the modem to clear it. The log did show some SYNC Timing issues at about 9am. All 3 upstream said LOCKED.

Also, now that the sun is going down, the SNR is starting to drop again, even though temps are more or less the same.


Darknessfall
Premium
join:2012-08-17
kudos:6
Reviews:
·Frontier Communi..
·Comcast
·AT&T U-Verse
said by andyross:

Saw my Zoom had the blinking US light today for the first time. (I don't normally see it as I keep it covered to reduce the light in the bedroom.) I reset the modem to clear it. The log did show some SYNC Timing issues at about 9am. All 3 upstream said LOCKED.

Also, now that the sun is going down, the SNR is starting to drop again, even though temps are more or less the same.

The blinking US light is common among many Zoom modems working fine.


fonzbear2000
Premium
join:2005-08-09
Saint Paul, MN

1 edit
reply to andyross
I don't know how anyone on here figures it's the cold that's having an effect on connection. I'm on the Performance tier.






--
I love my autistic brother so much!

Oedipus

join:2005-05-09
kudos:1
Downstream power goes up, downstream SNR goes down, and upstream power (and SNR?) go down when it gets colder. Vice versa in the heat.

andyross
Premium,MVM
join:2003-05-04
Schaumburg, IL
reply to fonzbear2000
My performance doesn't seem to be affected, beyond the occasional short-term outage.


gar187er
I do this for a living

join:2006-06-24
Dover, DE
kudos:4
reply to fonzbear2000
said by fonzbear2000:

I don't know how anyone on here figures it's the cold that's having an effect on connection

maybe cause a few of us work on cable when its cold.....system design dictates alot as to how bad it will be affected.
--
I'm better than you!


EG
The wings of love
Premium
join:2006-11-18
Union, NJ
kudos:10
reply to fonzbear2000
said by fonzbear2000:

I don't know how anyone on here figures it's the cold that's having an effect on connection. I'm on the Performance tier.

It can and does for some individual user's environments. There are millions of other subscribers out there..


Streetlight

join:2005-11-07
Colorado Springs, CO
reply to telcodad
Click for full size
Click for full size
The temp was supposed to get to 50 deg F today but only got to 45 deg F but here's some results for a temp change from - 4 deg F to 45 deg F.

The top fig is for the lower Temperature.

I don't understand the large swings you get. We were both at nearly the same lower temp but my data are for a considerably higher temp: 45 deg F vs. 27 deg F. Maybe there's a problem in your outdoor internet system.
--
There is nothing more deceptive than an obvious fact.

Sherlock Holmes in
The Boscombe Valley Mystery
A. C. Doyle
Strand Magazine, October 1891


telcodad
Premium
join:2011-09-16
Lincroft, NJ
kudos:15
said by Streetlight:

I don't understand the large swings you get. We were both at nearly the same lower temp but my data are for a considerably higher temp: 45 deg F vs. 27 deg F. Maybe there's a problem in your outdoor internet system.

Most likely due to the difference in the line equipment in our neighborhoods.

There also could be a temperature issue with a piece of line equipment in my system. I know on very hot summer days, I've seen my signal levels drop down several dB from their usual levels also.

Brocktoon

join:2009-08-11
Fairless Hills, PA
reply to andyross
Checked my modem logs and saw a ton of errors and loss of synch this afternoon. It's 9F outside now, and my downstream signals usually run +13 or higher with bad SNR when temps are single digits. After the synch errors and reboots this afternoon, my signals are now:

Frequency 651000000 669000000 687000000 693000000
Lock Status
(QAM Lock/FEC Sync/MPEG Lock) Y/Y/Y Y/Y/Y Y/Y/Y Y/Y/Y
Channel Id 1 4 7 8
Modulation 256QAM 256QAM 256QAM 256QAM
Symbol Rate
(Msym/sec) 5.360537 5.360537 5.360537 5.360537
Interleave Depth I=32
J=4 I=32
J=4 I=32
J=4 I=32
J=4
Power Level
(dBmV) 5.17 4.46 4.04 4.40
RxMER
(dB) 37.09 37.94 37.94 37.36
Correctable
Codewords 22 41 9 59
Uncorrectable
Codewords 669 659 542 1571

No change in the upstream:

Channel Type 1.0 N/A 2.0 2.0
Channel ID 12 N/A 10 11
Frequency
(Hz) 22000000 N/A 36200000 29400000
Ranging Status Success N/A Success Success
Modulation 16QAM N/A 64QAM 64QAM
Symbol Rate
(KSym/sec) 2560 N/A 5120 5120
Mini-Slot Size 4 N/A 4 4
Power Level
(dBmV) 37.50 N/A 40.25 39.25
T1 Timeouts 0 0 0 0
T2 Timeouts 0 0 0 0
T3 Timeouts 0 0 0 0
T4 Timeouts 0 0 0 0

So, signals are now great at 9F where they were +13 before with a ton of correctable errors. Has my issue finally been fixed ... or will I now see my singal level DROP very low when the temp goes above 27 to 30F?? I guess I'll find out as we going into tomorrow afternoon and later in the week.