Valued Participant

Re: Intermittent downstream speed issues: Lost MDD Timeout...

I rebooted the modem 1 day, 15 hours ago. Would the logs & signals pages be of any use now?

Expert

Re: Intermittent downstream speed issues: Lost MDD Timeout...

yes, that will show what's happenned since the reset

 

Valued Participant

Re: Intermittent downstream speed issues: Lost MDD Timeout...

Log page:

C

TimePriorityCodeMessage
Aug 29 2016 21:34:445-WarningT202.0Lost MDD Timeout;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 29 2016 21:34:445-WarningN/ADS Partial Service Fallback: MDD Lost-> CM in DOCSIS 3.0 Recovery Mode ;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 29 2016 16:50:515-WarningT202.0Lost MDD Timeout;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 29 2016 16:50:515-WarningN/ADS Partial Service Fallback: MDD Lost-> CM in DOCSIS 3.0 Recovery Mode ;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 29 2016 16:50:266-NoticeN/AMDD Recovery following MDD Loss;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 29 2016 14:58:455-WarningT202.0Lost MDD Timeout;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 29 2016 14:58:455-WarningN/ADS Partial Service Fallback: MDD Lost-> CM in DOCSIS 3.0 Recovery Mode ;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 29 2016 08:12:363-CriticalR02.0No Ranging Response received - T3 time-out;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 28 2016 22:59:496-NoticeI401.0TLV-11 - unrecognized OID;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 28 2016 22:59:485-WarningZ00.0MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:156-NoticeN/ACable Modem Reboot from GUI/Configuration page ;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 28 2016 20:39:395-WarningT202.0Lost MDD Timeout;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 28 2016 20:39:395-WarningN/ADS Partial Service Fallback: MDD Lost-> CM in DOCSIS 3.0 Recovery Mode ;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 28 2016 18:40:565-WarningT202.0Lost MDD Timeout;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 28 2016 18:40:565-WarningN/ADS Partial Service Fallback: MDD Lost-> CM in DOCSIS 3.0 Recovery Mode ;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 27 2016 15:42:016-NoticeI401.0TLV-11 - unrecognized OID;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 27 2016 15:42:015-WarningZ00.0MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:156-NoticeN/ACable Modem Reboot from GUI/Configuration page ;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 27 2016 15:37:386-NoticeI401.0TLV-11 - unrecognized OID;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 27 2016 15:37:385-WarningZ00.0MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;

 

  

Signals Page:

Cable Modem

DownstreamBonding Channel Value
Channel ID17 18 19 23 24 29 30 32 
Frequency555000000 Hz 561000000 Hz 567000000 Hz 591000000 Hz 597000000 Hz 627000000 Hz 633000000 Hz 645000000 Hz 
Signal to Noise Ratio37 dB 38 dB 38 dB 38 dB 38 dB 38 dB 38 dB 37 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
2 dBmV  2 dBmV  2 dBmV  3 dBmV  3 dBmV  2 dBmV  2 dBmV  0 dBmV  

 

UpstreamBonding Channel Value
Channel ID
Frequency30600000 Hz 24200000 Hz 19400000 Hz 37000000 Hz 
Ranging Service ID4581 4581 4581 4581 
Symbol Rate5.120 Msym/sec 5.120 Msym/sec 2.560 Msym/sec 2.560 Msym/sec 
Power Level50 dBmV 49 dBmV 48 dBmV 51 dBmV 
Upstream Modulation[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[2] 16QAM
 
[3] QPSK
[3] 16QAM
 
Ranging StatusSuccess Success Success Success 

 

Signal Stats (Codewords)Bonding Channel Value
Channel ID17 18 19 23 24 29 30 32 
Total Unerrored Codewords6627006827 6626425760 6243850161 6165361880 6132034854 6131997996 6132078167 3430474497 
Total Correctable Codewords457 478 608 912 835 1092 2028 1291 
Total Uncorrectable Codewords2622 2475 4901 9605 9163 13769 10389 221246 

 

 

Expert

Re: Intermittent downstream speed issues: Lost MDD Timeout...

You still have bad ingress, TWC needs to fix whatever is causing broadcast tv to leak into the cable.

 This could be in house or out on the street somewhere. If everything is shiny and tight call out TWC, this cannot be fixed over the phone, It also appears to be intermittent, probably an overhead line blowing in the wind.  Could be a poorly crimped connector or corrosion.

The bucket truck guy was out here working on an amp a half mile away and when he pulled off the cover, My modem immediately dropped off 2 channels with a ds partial service error. They're located about 25 miles away and not all that strong here. It doesn't take much to trash qam channels...   I also had the same problem with a loose connector on a modem I was testing.

 

 

Valued Participant

Re: Intermittent downstream speed issues: Lost MDD Timeout...

What is it in the log that I can point to when I call TWC? Is there something there that shows bad ingress? What is bad ingress? (pointers to cable electronics for dummies would also be appreciated!)

 

We had a lightning strike a few weeks ago that fried the TV circuitry in the TWC provided amp. They replaced it with a PPC 9-port Entry Series, EVO1-9-x/x. I just checked the connections on that, and found two TV connections that were not snug. The coax to the modems was OK.

 

Shortly after TWC switched us to the 100/10 service, they had to replace a bit of hardware out in my post, the underground cable to my post, and a bit of hardware just upstream of me. 

We're underground in the neighborhood, but above ground just outside of it.

 

 

(I'm a software person ... I can punch down Ethernet, but that's my limit)

Expert

Re: Intermittent downstream speed issues: Lost MDD Timeout...

How does power get to the amp? Where's the wall wort and is it connected to the 3rd bottom port with the white label or is it diplexed on the 4th port with another cable device?

where is the modem connected?

?

 loose connections anywhere are an issue, they must be a tad more than finger tight. use a 7/16 open end wrench, spec is 13 inch pounds of torque

You may have xixed this. BTW, are the unused connectors open or do they have terminating resistors screwed in?

 Is the modem on the VOIP bypass port?

 

Valued Participant

Re: Intermittent downstream speed issues: Lost MDD Timeout...

  1. Power gets to the amp from the transformer that came in the package with the amp.
  2. The wall wort is plugged in up in my attic, into a UPS, and its coax comes down to my home panel, and is plugged straight into the  white labeled power port.
  3. The modem and VOIP modem are plugged into output port 8, which goes back up into my attic, into a splitter, then off to my SB6141 and to the TWC VOIP modem.
  4. The VOIP bypass port has an unused outlet connected to it.
  5. All the connections on the amp are NOW snug, using a 7/16" wrench to get just past finger tight. I don't have a torque wrench for that low a force, but I can't undo the connections with my fingers, and I have a strong grip.
  6. The modem coax was already tight .. could the loose connection going out to a outlet be the culprit?
  7. There are no unused ports on the amp, but several of the outlets do not have anything connected. Should I put terminating resistors on those?
  8. The box on the outside of the house is clean & tight. The cable to the street is heavy duty cable (RG-6? I couldn't make out the markings. It's about 1/2" or a little less in diameter) that is less than a year old.

I was surprised to see the modems on a standard output port, and a TV outlet on the bypass port.  Should I switch those?

I have had another set of warnings in the log since the last set I posted, so I don't think that my tightening of the loose TV coax (which is connected to a TV, not to an unused outlet) fixed the issue.

If I call TWC, what is the magic incantation I need, based on the logs, to get them to send out an experienced tech?

Here are the new log entries:

Aug 30 2016 21:51:105-WarningT202.0Lost MDD Timeout;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 30 2016 21:51:105-WarningN/ADS Partial Service Fallback: MDD Lost-> CM in DOCSIS 3.0 Recovery Mode ;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 30 2016 21:51:105-WarningT202.0Lost MDD Timeout;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;
Aug 30 2016 21:51:105-WarningN/A

DS Partial Service Fallback: MDD Lost-> CM in DOCSIS 3.0 Recovery Mode ;CM-MAC=cc:65:ad:0f:d5:bb;CMTS-MAC=00:17:10:8b:75:03;CM-QOS=1.1;CM-VER=3.0;

 

 

 

The uncorrectable codewords count has gone up since my last post of the signals page:

Channel ID17 18 19 23 29 30 31 
Total Unerrored Codewords9657846625 9505921231 9123415336 8840759134 8606079831 8377250968 8377455947 
Total Correctable Codewords1138 1007 1166 3257 1338 1515 2499 
Total Uncorrectable Codewords3696 4740 6419 15175 17915 53284 51492 
Expert

Re: Intermittent downstream speed issues: Lost MDD Timeout...

you're getting bad ingress from broadcast TV channels 41-42-43, it's probably outside the house.

BUT: other items are iffy...

 

yes, empty ports should have term resistors on them.

 I would run an extra  coax to seperate the 2 modems, put the EMTA one on the voip bypass port.

 get the data modem on a port of it's own.

you could save a coax by using port 1 and a power inserter rather than the seperate coax for power only. I'd put a tv on that port rather than the data modem.

Verify connections at all devices are also a tad more than finger tight.

 

Valued Participant

Re: Intermittent downstream speed issues: Lost MDD Timeout...

I truly appreciate your answers.

I'm learning more & more, but that's making me have more questions.

How do you know that it's channels 41-42-43 that is interfering?

 

I'll put terminators on the unused outlet plates.

I don't have a power inserter, so that option is out. Not an issue, though, as one of the ports is going to outlets that are there for different furniture arrangements. I can use that port for a new coax to the modem, and move the VOIP modem to the bypass port. If I'm reading the tiny diagrams on the amp instructions correctly,  I can put the modem on any output port?

 

Thanks again.

 

Expert

Re: Intermittent downstream speed issues: Lost MDD Timeout...

correct. Also, make sure the connectors on the back side of outlets are tight.

I wanted you to get something on that empty VOIP port as it is a 2 way splitter on the amp input and empty ports are not good.