Daily Internet Drops Still Occuring

[Eatonian49]

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 ID	10	9	11	12	13	14	15	16
Frequency	513000000 Hz	507000000 Hz	519000000 Hz	525000000 Hz	531000000 Hz	537000000 Hz	543000000 Hz	549000000 Hz
Signal to Noise Ratio	38 dB	38 dB	38 dB	38 dB	38 dB	38 dB	38 dB	38 dB
Downstream Modulation	QAM256	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	7	8	5	6
Frequency	30600000 Hz	37000000 Hz	19400000 Hz	24200000 Hz
Ranging Service ID	2432	2432	2432	2432
Symbol Rate	5.120 Msym/sec	2.560 Msym/sec	2.560 Msym/sec	5.120 Msym/sec
Power Level	43 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 Status	Success	Success	Success	Success

Signal Stats (Codewords)Bonding Channel Value

Channel ID	10	9	11	12	13	14	15	16
Total Unerrored Codewords	11801343	11473621	11456731	11481812	11444776	11447429	11446474	11448702
Total Correctable Codewords	24	6	1	1	45	43	13	11
Total Uncorrectable Codewords	1157	514	569	514	614	618	694	680

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

Oct 27 2017 20:04:00	6-Notice	I401.0	TLV-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 20:04:00	5-Warning	Z00.0	MIMO 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 00:00:16	6-Notice	N/A	Cable 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 20:03:10	3-Critical	R04.0	Received 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 20:03:09	5-Warning	T202.0	Lost 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 20:03:09	3-Critical	R04.0	Received 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 20:03:08	5-Warning	T202.0	Lost 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 20:03:07	3-Critical	R04.0	Received 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 20:02:46	3-Critical	T05.0	SYNC 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!

[karlbeckman]

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.  

[Eatonian49]

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.

[Eatonian49]

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

Downstream Bonding Channel Value

Channel ID	10	9	11	12	13	14	15	16
Frequency	513000000 Hz	507000000 Hz	519000000 Hz	525000000 Hz	531000000 Hz	537000000 Hz	543000000 Hz	549000000 Hz
Signal to Noise Ratio	38 dB	39 dB	39 dB	39 dB	39 dB	39 dB	39 dB	39 dB
Downstream Modulation	QAM256	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	7	8	5	6
Frequency	30600000 Hz	37000000 Hz	19400000 Hz	24200000 Hz
Ranging Service ID	3086	3086	3086	3086
Symbol Rate	5.120 Msym/sec	2.560 Msym/sec	2.560 Msym/sec	5.120 Msym/sec
Power Level	43 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 Status	Success	Success	Success	Success

Signal Stats (Codewords)Bonding Channel Value

Channel ID	10	9	11	12	13	14	15	16
Total Unerrored Codewords	2255310729	2255319046	2255327218	2255297225	2255294327	2255292170	2255295696	2255296704
Total Correctable Codewords	24	0	13	0	18	16	19	46
Total Uncorrectable Codewords	643	520	527	541	709	618	626	607

[MsRaye]

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.

[Eatonian49]

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 ID	10	9	11	12	13	14	15	26
Frequency	513000000 Hz	507000000 Hz	519000000 Hz	525000000 Hz	531000000 Hz	537000000 Hz	543000000 Hz	609000000 Hz
Signal to Noise Ratio	39 dB	39 dB	39 dB	39 dB	39 dB	39 dB	39 dB	39 dB
Downstream Modulation	QAM256	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	7	8	5	6
Frequency	30600000 Hz	37000000 Hz	19400000 Hz	24200000 Hz
Ranging Service ID	3086	3086	3086	3086
Symbol Rate	5.120 Msym/sec	2.560 Msym/sec	2.560 Msym/sec	5.120 Msym/sec
Power Level	43 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 Status	Success	Success	Success	Success

Signal Stats (Codewords)Bonding Channel Value

Channel ID	10	9	11	12	13	14	15	26
Total Unerrored Codewords	3041044638	3041052956	3041061127	3041031134	3041028256	3041026153	3041033500	2958365100
Total Correctable Codewords	24	0	13	0	18	16	19	100
Total Uncorrectable Codewords	643	520	527	541	709	618	626	1831

[MsRaye]

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

.

[Eatonian49]

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.

[MsRaye]

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.

[MsRaye]

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.