Valued Contributor

Re: Bonded downstream channels

Channels 5 and 8 have been gone for days, so they haven't been in the signal page list most of this week.  Channel 16 got picked yo a couple of days ago, and it got really bad last night.  This morning's signal page is about the same as last night's post.  speedtest.net at 8:15 this morning is still showing only 1.38 Mbps download speed, unchanged since midnight.... over 8 hours.  Apparently it won't come back to proper speed unless I reboot the modem.

 

Downstream Bonding Channel Value
Channel ID16 
Frequency555000000 Hz 561000000 Hz 567000000 Hz 573000000 Hz 585000000 Hz 591000000 Hz 645000000 Hz 
Signal to Noise Ratio36 dB 36 dB 37 dB 38 dB 38 dB 37 dB 37 dB 
Downstream ModulationQAM256 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
1 dBmV  2 dBmV  1 dBmV  2 dBmV  2 dBmV  3 dBmV  0 dBmV  

 

Upstream Bonding Channel Value
Channel ID
Frequency24200000 Hz 19400000 Hz 30600000 Hz 37000000 Hz 
Ranging Service ID4160 4160 4160 4160 
Symbol Rate5.120 Msym/sec 2.560 Msym/sec 5.120 Msym/sec 2.560 Msym/sec 
Power Level43 dBmV 42 dBmV 43 dBmV 44 dBmV 
Upstream Modulation[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[2] 16QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[3] 16QAM
 
Ranging StatusSuccess Success Success Success 

 

Signal Stats (Codewords)Bonding Channel Value
Channel ID14 16 
Total Unerrored Codewords9150715191 9150077944 9007026217 8992441129 8992351357 8865038756 7448673667 3700761969 
Total Correctable Codewords199 288 349 368 482 277 3249 16994 
Total Uncorrectable Codewords1678 2596 3797 3964 5318 5237 179623 1121702 
Valued Contributor

Re: Bonded downstream channels

Tech and I texted, he looked remotely and said 633 MHz looked terrible and to check that the coax was tight on the back of my modem.  Of course it is, but I checked again anyway.  He sent out a line man an hour later to check the amp at my pole, as he is off till Sunday.  The line man didn't find anything wrong, of course.  Tech said they need to catch it happening.  It often happens between 11pm and 1am.  Line man said they've had problems with 8-channel modems recently and they've been upgrading modem rental customers to the 16-channel modems.  He thinks they may eventually drop the 8-channel models from the approved list.  :-\

After 10+ hours with 1.38 Mbps download speed, I figured it wasn't going to self-correct, and rebooted the modem (power reset).  It is back to 8 downstream channels, but interestingly, for the first time, they are not consecutive 1 thru 8 right after reboot.  Channel 4 was passed over and I got channel 14 instead.  Interference right out of the gate I guess.

 

Here's what I got after reboot:

 

Downstream Bonding Channel Value
Channel ID14 
Frequency555000000 Hz 561000000 Hz 567000000 Hz 579000000 Hz 585000000 Hz 591000000 Hz 597000000 Hz 633000000 Hz 
Signal to Noise Ratio38 dB 38 dB 38 dB 38 dB 38 dB 38 dB 39 dB 38 dB 
Downstream ModulationQAM256 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
0 dBmV  0 dBmV  0 dBmV  0 dBmV  1 dBmV  1 dBmV  2 dBmV  0 dBmV  

 

Upstream Bonding Channel Value
Channel ID
Frequency24200000 Hz 19400000 Hz 30600000 Hz 37000000 Hz 
Ranging Service ID417 417 417 417 
Symbol Rate5.120 Msym/sec 2.560 Msym/sec 5.120 Msym/sec 2.560 Msym/sec 
Power Level44 dBmV 43 dBmV 44 dBmV 44 dBmV 
Upstream Modulation[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[2] 16QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[3] 16QAM
 
Ranging StatusSuccess Success Success Success 

 

Signal Stats (Codewords)Bonding Channel Value
Channel ID14 
Total Unerrored Codewords374662450 374045744 374053939 295936918 295929572 295930572 295931570 295928864 
Total Correctable Codewords11 22 50 21 17 17 
Total Uncorrectable Codewords516 534 532 696 623 627 609 1543 
Expert

Re: Bonded downstream channels

[ Edited ]

last post looks a lot better...

.. if everything from the modem to the pole tap is new, they need to get the bucket truck guys out.

Be glad you aren't trying to use a 4 ch modem...

 

You need to see if some ham radio guys can find the egress points on the street lines and get them, out to fix them. best place to start is on the AGC pilot frequency which is probably 445.250

 

Valued Contributor

Re: Bonded downstream channels

[ Edited ]

Yeah, wish I knew a ham operator.  I've been reading through a lot of posts on this forum over the years, usually with you involved, because you always give the best information.  I've been a fan for a few years but previously only read posts, not asked anything.  I ran across one about an issue in Austin, TX... 'High Uncorrectables on one channel' where the poster went from 16 to 24 downstream channels.  I know from what the tech told me a couple of weeks ago that some of my city (Greensboro NC) has 24 channels, and some 16.  I can see where that will cause issues eventually for people with 8-channel modems even though they are in the TWC approved list..... and probably wreak havoc for anyone using a 4 channel modem.

 

Just as an aside, a couple of years back you mentioned some people who had Starter TV only, and Internet, were pit in a block of wavelengths to filter the other paid TV channels out, and the wrong filters were being used, causing issues with Internet.  Is this still a problem  some places?  I have Internet and Starter TV.  Up until about a year ago, there was no filter installed so I was getting Standard Cable channels as well, though I wasn't paying for them.  This went on a few years!  No one ever put the filter on.  Then about a year ago, TWC trucks were in the neighborhood and suddenly I lost all those channels I wasn't supposed to be getting.  Over the next few months after that, Digital Set-top Adapters became mandatory to get ANY TV.  My issues seem to have started about the same time all that was going on, and got steadily worse the past couple of months.

Side note: I am still paying for Standard Internet but my TWC bill now says Extreme Internet... and the tech said they were going to do something with my bill to compensate me for all these issues.  I think they gave me a free upgrade, and that's why I am getting 50 Mbps down instead of 15.  My area still advertises 15 down as the Standard Internet speed, so Greensboro hasn't had a speed upgrade yet as I originally thought..... I think!

 

OH!  About half an hour ago apparently, while I was out, I had another Partial Service Fallback> Recovery Mode, and lost a downstream channel.  I now have only 7 channels instead of the 8 I had ten hours ago.

 

TimePriorityCodeMessage

Jul 22 2016 19:54:185-WarningT202.0Lost MDD Timeout;CM-MAC=20:3d:66:06:0c:8b;CMTS-MAC=00:17:10:8a:37:0e;CM-QOS=1.1;CM-VER=3.0;
Jul 22 2016 19:54:185-WarningN/ADS Partial Service Fallback: MDD Lost-> CM in DOCSIS 3.0 Recovery Mode ;CM-MAC=20:3d:66:06:0c:8b;CMTS-MAC=00:17:10:8a:37:0e;CM-QOS=1.1;CM-VER=3.0;
Jul 22 2016 09:14:556-NoticeI401.0TLV-11 - unrecognized OID;CM-MAC=20:3d:66:06:0c:8b;CMTS-MAC=00:17:10:8a:37:0e;CM-QOS=1.1;CM-VER=3.0;
Jul 22 2016 09:14:555-WarningZ00.0MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=20:3d:66:06:0c:8b;CMTS-MAC=00:17:10:8a:37:0e;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:156-NoticeN/ACable Modem Reboot due to power reset ;CM-MAC=20:3d:66:06:0c:8b;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;

 

Downstream Bonding Channel Value
Channel ID
Frequency555000000 Hz 561000000 Hz 567000000 Hz 585000000 Hz 591000000 Hz 597000000 Hz 603000000 Hz 
Signal to Noise Ratio38 dB 38 dB 38 dB 38 dB 39 dB 39 dB 39 dB 
Downstream ModulationQAM256 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
2 dBmV  2 dBmV  2 dBmV  2 dBmV  3 dBmV  3 dBmV  3 dBmV  

 

Upstream Bonding Channel Value
Channel ID
Frequency24200000 Hz 19400000 Hz 30600000 Hz 37000000 Hz 
Ranging Service ID417 417 417 417 
Symbol Rate5.120 Msym/sec 2.560 Msym/sec 5.120 Msym/sec 2.560 Msym/sec 
Power Level43 dBmV 43 dBmV 44 dBmV 44 dBmV 
Upstream Modulation[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[2] 16QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[3] 16QAM
 
Ranging StatusSuccess Success Success Success 

 

Signal Stats (Codewords)Bonding Channel Value
Channel ID
Total Unerrored Codewords1840681514 1840064808 1840073004 1606026869 1641909414 1641902353 1571996770 
Total Correctable Codewords11 63 101 43 95 
Total Uncorrectable Codewords516 534 532 2090 1229 1250 2444 
Expert

Re: Bonded downstream channels

 your head ends modem ch 4&5 are broadcast tv ch's 31 and 32. Don't any of the techs you've talked to and have had out have any clue what ingress is and why it's  on the local tv broadcast channels? Has anyone escalated this to the bucket truck guys or are they afraid to?

 

 

Valued Contributor

Re: Bonded downstream channels

[ Edited ]

The original tech who came out has been doing all the followup so far.  I told him about the ingress via local TV broadcast channels and he said that can't happen because they aren't on the same wavelengths or frequencies or whatever as the cable channels.  I said, Not cable channels, downstream channels for the modem.  He said broadcast TV channels are digital and not on the same wavelength or whatever as the modem channels.  I tried to show him what you stated in this post and he just said that forums don't have very good information.  I threw my hands in the air at that point. 

The guy in the bucket truck who the tech sent out today said he couldn't find anything wrong, and if it occurs more often at a particular time range, maybe they would watch my signals between 11pm and 1am.  He also said if that didn't lead anywhere, they might have to get what he referred to as the "third shift guys" on it.  I dunno if that's what he calls third tier.

Anyway, the tech involved, and the bucket guy I saw today, don't look at any of the modem log info i try to show them and appear glassy eyed when i verbally tell them what is in the logs.   The tech looked at my connection remotely or however this morning and said that one range looked terrible, I don't know if he was looking at signal or uncorrectables or what.

Basically they are just discounting the idea of broadcast TV ingress being a possibility, as far as I can tell.  it's totally frustrating.  They don't look beyond the pole on the street next door.

Valued Contributor

Re: Bonded downstream channels

Your "original tech" couldn't be more wrong about that.  It does not matter that the source of ingress is a different modulation type than what the cable modem is configured for.  RF ingress from over-the-air TV broadcasters, cell towers, two-way radio, etc. -- if near or on the cable modem's operating frequencies (fundamentally or harmonically) can interfere with your modem.

 

Here's one of my lengthy threads that dealt with ingress that was eventually solved: http://forums.timewarnercable.com/t5/Connectivity/Ingress/td-p/62009/highlight/true

 

The maintenance engineer and his team understood the RF ingress issue.

Valued Contributor

Re: Bonded downstream channels

Interesting thread, agia, but a bit over my head in terms of the signal monitoring you were able to do with your TV as well as your Internet modem.  I don't have that level of evidence to give the tech (who ignores it anyway).  I have speedtest.net results, modem logs and signal pages, in screenshots and posted here.  It looks like your SNR and levels were sometimes out of spec, where mine are usually pretty good.  My issue shows up in intermittent high uncorrectables on a downstream channel or two, along with dropped channels over a couple of days, till my 8-downstream driops to 7, then 6 or 5 channels, and I have the massive speed drop suddenly occur. 

Since I only have Starter TV I have no STB, only a Digital Adapter, and no way to check the TV signal for issues other than visually noting pixelation or freezes.  TV issues are rarer than a couple of weeks ago, but the Internet issues remain.

 

Should I just tell the tech I'm breaking up with him...lol .... and start all over with another tech on a new call?  Is there some way to insist on the tech escalating this?

Expert

Re: Bonded downstream channels

Another tech who has no clue what ingress is. And that this is an intermittent issue,No technical / rf knowledge on identifying or remedying it.Robot Sad

 Don't these guys even have a clue that cable tv uses the same frequencies as many other licensed services?

And as for others on the forum having bad advice, I'll bet none of them have FCC and other licenses/training or any actual RF training or experiences..  Your problems been discussed and diagnosed for a month, I'd suggest you call your states cable tv comission, BBB, attorney general-consumer protection, since TWC is not doing anything other than give you the runaround hoping you'll simply go away.

 

 

Valued Contributor

Re: Bonded downstream channels

[ Edited ]

It took me a long time to get my issues resolved.  I see your thread is long as well and your issue appears to be caused by another source of RF.  It helped me to gather my own evidence (software that I wrote or modified from others). 

 

I would escalate your problems with TWC.  Have you been able to talk with any Tier 3 techs?  Tier 3 was seeing the degradation issues I had whereas the 'house call' people did not (nor really understand it).  I was on the phone with Tier 3 a lot as well as e-mail providing data tables and charts. 

 

I was also eventually referred to the maintenance department which is a separate unit within TWC.  They were the most useful.  I also recommend using DSLReports.com where you can communicate with TWC privately.  Refer them to this thread.

 

You need to keep at it, preferably multiple contacts, until you get their undivided attention.  In the interim, the advice you get from MsRaye is spot on.  It is very important to insure all cable connections are tight (just like you would expect for your water pipes), quality connectors and cable are used, insure other devices that can transmit (e.g. cell phones) are not near your equipment because your stuff will get blamed first.  My problems were predominately in a pedestal across the street from me.