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Daily Internet Drops Still Occuring

Hello all.

 

I posted a couple weeks ago about daily T4 timeouts that I have been having for a few months now. It was suggested I buy a splitter with a termination port so I purchased and installed those. The signal didn't drop for about 4 days but then one night my download slowed down greatly and I had to reset the modem. After that, the signal doesn't last for more than a day now. Also, the modem is a year old Arris SB6141 modem that I own.

 

Below is the result of installing the splitter:

 

Channel ID10 11 12 13 14 15 16 
Frequency513000000 Hz 507000000 Hz 519000000 Hz 525000000 Hz 531000000 Hz 537000000 Hz 543000000 Hz 549000000 Hz 
Signal to Noise Ratio38 dB 38 dB 38 dB 38 dB 38 dB 38 dB 38 dB 38 dB 
Downstream ModulationQAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 
Power Level
 
8 dBmV  8 dBmV  7 dBmV  8 dBmV  8 dBmV  8 dBmV  8 dBmV  8 dBmV  

 

Channel ID
Frequency30600000 Hz 37000000 Hz 19400000 Hz 24200000 Hz 
Ranging Service ID2432 2432 2432 2432 
Symbol Rate5.120 Msym/sec 2.560 Msym/sec 2.560 Msym/sec 5.120 Msym/sec 
Power Level43 dBmV 43 dBmV 43 dBmV 43 dBmV 
Upstream Modulation[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[2] 16QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
Ranging StatusSuccess Success Success Success 

 

Signal Stats (Codewords)Bonding Channel Value

Channel ID10 11 12 13 14 15 16 
Total Unerrored Codewords11801343 11473621 11456731 11481812 11444776 11447429 11446474 11448702 
Total Correctable Codewords24 45 43 13 11 
Total Uncorrectable Codewords1157 514 569 514 614 618 694 680 

 

Here is my most recent timeout, which happend 5 minutes ago:

Oct 27 2017 20:04:006-NoticeI401.0TLV-11 - unrecognized OID;CM-MAC=04:4e:5a:31:6e:2e;CMTS-MAC=00:17:10:89:85:14;CM-QOS=1.1;CM-VER=3.0;
Oct 27 2017 20:04:005-WarningZ00.0MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=04:4e:5a:31:6e:2e;CMTS-MAC=00:17:10:89:85:14;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:166-NoticeN/ACable Modem Reboot due to T4 timeout ;CM-MAC=04:4e:5a:31:6e:2e;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Oct 27 2017 20:03:103-CriticalR04.0Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=04:4e:5a:31:6e:2e;CMTS-MAC=00:17:10:89:85:14;CM-QOS=1.1;CM-VER=3.0;
Oct 27 2017 20:03:095-WarningT202.0Lost MDD Timeout;CM-MAC=04:4e:5a:31:6e:2e;CMTS-MAC=00:17:10:89:85:14;CM-QOS=1.1;CM-VER=3.0;
Oct 27 2017 20:03:093-CriticalR04.0Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=04:4e:5a:31:6e:2e;CMTS-MAC=00:17:10:89:85:14;CM-QOS=1.1;CM-VER=3.0;
Oct 27 2017 20:03:085-WarningT202.0Lost MDD Timeout;CM-MAC=04:4e:5a:31:6e:2e;CMTS-MAC=00:17:10:89:85:14;CM-QOS=1.1;CM-VER=3.0;
Oct 27 2017 20:03:073-CriticalR04.0Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=04:4e:5a:31:6e:2e;CMTS-MAC=00:17:10:89:85:14;CM-QOS=1.1;CM-VER=3.0;
Oct 27 2017 20:02:463-CriticalT05.0SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=04:4e:5a:31:6e:2e;CMTS-MAC=00:17:10:89:85:14;CM-QOS=1.1;CM-VER=3.0;

 

Any advice on what to do next would be appreciated. Thank you!

14 REPLIES
Proven Sharer

Re: Daily Internet Drops Still Occuring

Based on the uncorrectable error counts, it looks like broadcast ingress on your modem's home DS channel 10.  If you include your ZIP Code we can find out if there is a local TV station on channel 21, the most likely cause.

Check that all connectors are tight and shiny, including the back side of any wall plates.  Be sure any jumper cables are newer RG-6QS with compression connectors, NOT crimped type, molded plastic, or screw-ons.   Do you have any cables running to rooms with wall plates that don't have a device connected to them?  Disconnect them from the splitter and put a 75 ohm terminator on the empty splitter connection., or you can just put the terminator on the wall plate.  

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Re: Daily Internet Drops Still Occuring

My zip code is 29710.

 

The splitter I installed only has the main TWC line going into "IN" and the only "OUT" connected  is one to the modem. The other one has a 75 ohm terminator screw. So I should go around the house and put terminators on all of the unused wall ports?

 

Also, inside the box outside there is a good bit of coiled up cable line inside the box that is not hooked to anything. Should I remove that excess cable? I doubt I'll ever have more than one connection.

 

I also don't have cable but I do have antenna but the issue was happening before I installed that.

Browser

Re: Daily Internet Drops Still Occuring

Here is my signal as of this morning just to show a comparison:

Downstream Bonding Channel Value
Channel ID10 11 12 13 14 15 16 
Frequency513000000 Hz 507000000 Hz 519000000 Hz 525000000 Hz 531000000 Hz 537000000 Hz 543000000 Hz 549000000 Hz 
Signal to Noise Ratio38 dB 39 dB 39 dB 39 dB 39 dB 39 dB 39 dB 39 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
8 dBmV  8 dBmV  8 dBmV  8 dBmV  8 dBmV  8 dBmV  7 dBmV  7 dBmV  

 

Upstream Bonding Channel Value
Channel ID
Frequency30600000 Hz 37000000 Hz 19400000 Hz 24200000 Hz 
Ranging Service ID3086 3086 3086 3086 
Symbol Rate5.120 Msym/sec 2.560 Msym/sec 2.560 Msym/sec 5.120 Msym/sec 
Power Level43 dBmV 43 dBmV 42 dBmV 42 dBmV 
Upstream Modulation[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[2] 16QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
Ranging StatusSuccess Success Success Success 

 

Signal Stats (Codewords)Bonding Channel Value
Channel ID10 11 12 13 14 15 16 
Total Unerrored Codewords2255310729 2255319046 2255327218 2255297225 2255294327 2255292170 2255295696 2255296704 
Total Correctable Codewords24 13 18 16 19 46 
Total Uncorrectable Codewords643 520 527 541 709 618 626 607 
Expert

Re: Daily Internet Drops Still Occuring

Levels are ok, don't remove the splitter. Without it there could be too much on the DS side

 

 But, make sure all connectors are a tad more than finger tight, including the back side of wall plates. any corroded connecters are bad as well, where much ingress originates as well as lines thryu trees that the rodents chew up.

 

 

Browser

Re: Daily Internet Drops Still Occuring

Okay. I'll make sure the wall plug is secured. Quick question, though. Why did Channel ID 16 change to 26 (below)? The unccorectables tripled as well. That indicative of a problem? No net drops yet today, though.

 

Downstream Bonding Channel Value
Channel ID10 11 12 13 14 15 26 
Frequency513000000 Hz 507000000 Hz 519000000 Hz 525000000 Hz 531000000 Hz 537000000 Hz 543000000 Hz 609000000 Hz 
Signal to Noise Ratio39 dB 39 dB 39 dB 39 dB 39 dB 39 dB 39 dB 39 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
8 dBmV  9 dBmV  8 dBmV  8 dBmV  8 dBmV  8 dBmV  8 dBmV  8 dBmV  

 

Upstream Bonding Channel Value
Channel ID
Frequency30600000 Hz 37000000 Hz 19400000 Hz 24200000 Hz 
Ranging Service ID3086 3086 3086 3086 
Symbol Rate5.120 Msym/sec 2.560 Msym/sec 2.560 Msym/sec 5.120 Msym/sec 
Power Level43 dBmV 43 dBmV 42 dBmV 42 dBmV 
Upstream Modulation[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
[3] QPSK
[2] 16QAM
 
[3] QPSK
[1] 16QAM
[2] 64QAM
 
Ranging StatusSuccess Success Success Success 

 

Signal Stats (Codewords)Bonding Channel Value
Channel ID10 11 12 13 14 15 26 
Total Unerrored Codewords3041044638 3041052956 3041061127 3041031134 3041028256 3041026153 3041033500 2958365100 
Total Correctable Codewords24 13 18 16 19 100 
Total Uncorrectable Codewords643 520 527 541 709 618 626 1831 
Expert

Re: Daily Internet Drops Still Occuring

You indeed are having a broadcast TV ingress issue and the difference between the lowest and highest channel is well over the modems maximum acceptance bandwidth of 96 mHz and probably severely impaired intermediate channels.

 Something is corroded or loose, probably the outside line, either at the pole, grounding block or tree rodemnt chewed in trees.

If you don't foind anything, TWC needs to come out and replace the outside stuff, especially if it's more than 5 years old

.

 

Browser

Re: Daily Internet Drops Still Occuring

Well I moved into the house in May of this year and they laid a brand new line to the house since it wasn't wired for Spectrum. So that may rule out a chewed cable. I will check behind my wall port and a verify corrosion/loose connection. 

Just for my knowledge, could you explain what part of the signal page shows where the maximum bandwidth is exceeded? Want to be able to explain as much as I can if need be. Thank you for the help so far.

Expert

Re: Daily Internet Drops Still Occuring

subtract the lowest frequency from the highest.. If the number exceeds 90 mHz the modems 96 mHz acceptance bandwidth is exceeded.

 Normally the modems are sent sequential channels with the first (home) channel being one of the 8 to ballance loading.

 Problem is that ingress will kill a channel and a new one is assigned, should be the next channel up unless there's ingress on it or the channel is overloaded.

Sorry but the 4 and 8 channel modems are obsolete on TWC/ Spectrum systems that have 24-32 channel DS channels now. The modems must be full bandwidth ones that accept 100-1000 mHz and not in seperate banks.

4ch modems were 36 mHz bandwidth and the 8 channels were 96 mHz bandwidth. But if there is a badly ingressed channel that is skipped between the listed and used ones, performance is also degraded.

It's not a bad modem but bad system maint by TWC and Spectrum.

 

 

Expert

Re: Daily Internet Drops Still Occuring

The 8th ch (26) is impaired either by ingress or being too far from the other 7 channels and more than 96 mHz from the lowest channel.

Doing a factory reset will TEMPORARILY restore the modem to sequential channels untill yoiur ingress bumps off channels.

 The ingress point(s) needs to be found and repaired

 Your old ch 16 was on 549 mHz which is broadcast TV channel 27 .. What's your zip code? I can see if there's a 27 or 28 in your area with a strong signal.

609 Mhz is TV ch 37. But it's sort of unused by TV ( https://en.wikipedia.org/wiki/Channel_37) has low power hospital telemetry on it like those wireless EKG patient monitors. If it has ingress, it either them or broadcast TV channels 36-38 . You'd need a 32 ch cable modem to track actual ingress since those don't seem to reassign bad channels.