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Constant drops in connection, modem reboots and cannot hold bonded upstream lately

New Poster

Constant drops in connection, modem reboots and cannot hold bonded upstream lately

As of about the last week (and others reported in our area) thorughout the day I am experiencing constant connection drops. It seems to be the same pattern of events, I lose connectivity, the bonded up stream drops (goes to green from blue) and then it resets and gets back on line. I have a docsis 3.0 SB6190 modem barely 2 years old. Had tech out to test lines and of course while he was here the signals all checked and had no drops while he was here. He tightened a coupler outside and saif it could have been that. I am very doubtful because its still happening. I am seeing a very steady pattern of evens on the modem log too each time it happens. It just happened again and here is what I see (below). Does anyone have any ideas on what this is and how to resolve, Comcast in typical fashion denies culpability since the levels check out everytime I call or they are out.

 

Tue Oct 01 11:07:04 2019

3

Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=5c:e3:0e:3b:97:61;CMTS-MAC=dc:eb:94:b5:1a:b4;CM-QOS=1.1;CM-VER=3.0;

Tue Oct 01 11:07:04 2019

3

No Ranging Response received - T3 time-out;CM-MAC=5c:e3:0e:3b:97:61;CMTS-MAC=dc:eb:94:b5:1a:b4;CM-QOS=1.1;CM-VER=3.0;

Tue Oct 01 11:07:24 2019

3

Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=5c:e3:0e:3b:97:61;CMTS-MAC=dc:eb:94:b5:1a:b4;CM-QOS=1.1;CM-VER=3.0;

Tue Oct 01 11:07:24 2019

3

No Ranging Response received - T3 time-out;CM-MAC=5c:e3:0e:3b:97:61;CMTS-MAC=dc:eb:94:b5:1a:b4;CM-QOS=1.1;CM-VER=3.0;

Tue Oct 01 11:07:44 2019

3

Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=5c:e3:0e:3b:97:61;CMTS-MAC=dc:eb:94:b5:1a:b4;CM-QOS=1.1;CM-VER=3.0;

Tue Oct 01 11:07:44 2019

3

No Ranging Response received - T3 time-out;CM-MAC=5c:e3:0e:3b:97:61;CMTS-MAC=dc:eb:94:b5:1a:b4;CM-QOS=1.1;CM-VER=3.0;

Tue Oct 01 11:08:24 2019

3

Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=5c:e3:0e:3b:97:61;CMTS-MAC=dc:eb:94:b5:1a:b4;CM-QOS=1.1;CM-VER=3.0;

Tue Oct 01 11:08:24 2019

3

No Ranging Response received - T3 time-out;CM-MAC=5c:e3:0e:3b:97:61;CMTS-MAC=dc:eb:94:b5:1a:b4;CM-QOS=1.1;CM-VER=3.0;

Tue Oct 01 11:08:25 2019

5

RCS Partial Service;CM-MAC=5c:e3:0e:3b:97:61;CMTS-MAC=dc:eb:94:b5:1a:b4;CM-QOS=1.1;CM-VER=3.0;

Tue Oct 01 11:08:59 2019

3

No Ranging Response received - T3 time-out;CM-MAC=5c:e3:0e:3b:97:61;CMTS-MAC=dc:eb:94:b5:1a:b4;CM-QOS=1.1;CM-VER=3.0;

Tue Oct 01 11:09:10 2019

5

RCS Partial Service;CM-MAC=5c:e3:0e:3b:97:61;CMTS-MAC=dc:eb:94:b5:1a:b4;CM-QOS=1.1;CM-VER=3.0;

Expert

Re: Constant drops in connection, modem reboots and cannot hold bonded upstream lately

Please also post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.






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New Poster

Re: Constant drops in connection, modem reboots and cannot hold bonded upstream lately

Status

The statuses listed show the connection state of the cable modem. They are used by your service provider to evaluate the operation of the cable modem.

 
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel   Locked
Connectivity State OK Operational
Boot State OK Operational
Configuration File OK  
Security Enabled BPI+
DOCSIS Network Access Enabled Allowed  

 
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Corrected Uncorrectables
1 Locked 256QAM 9 531.00 MHz -0.10 dBmV 37.36 dB 44441 28275
2 Locked 256QAM 1 477.00 MHz 0.80 dBmV 37.64 dB 113002 110620
3 Locked 256QAM 2 483.00 MHz 0.80 dBmV 37.64 dB 94605 102224
4 Locked 256QAM 3 489.00 MHz 0.50 dBmV 37.36 dB 76576 63202
5 Locked 256QAM 4 495.00 MHz 0.90 dBmV 38.61 dB 41096 26849
6 Locked 256QAM 5 507.00 MHz 0.60 dBmV 37.64 dB 23992 17692
7 Locked 256QAM 6 513.00 MHz 0.60 dBmV 37.64 dB 25935 13549
8 Locked 256QAM 7 519.00 MHz 0.60 dBmV 37.64 dB 17215 13794
9 Locked 256QAM 8 525.00 MHz 0.50 dBmV 37.36 dB 25104 11905
10 Locked 256QAM 10 537.00 MHz -0.10 dBmV 37.64 dB 54040 48626
11 Locked 256QAM 11 543.00 MHz -0.50 dBmV 37.36 dB 73196 70613
12 Locked 256QAM 12 549.00 MHz -0.90 dBmV 37.36 dB 66512 77311
13 Locked 256QAM 13 555.00 MHz -1.00 dBmV 37.36 dB 64713 67644
14 Locked 256QAM 14 561.00 MHz -0.90 dBmV 37.64 dB 42283 32489
15 Locked 256QAM 15 567.00 MHz -0.80 dBmV 37.36 dB 30754 26186
16 Locked 256QAM 16 573.00 MHz -0.60 dBmV 37.64 dB 12634 7212
17 Locked 256QAM 17 579.00 MHz -1.00 dBmV 37.36 dB 9890 13593
18 Locked 256QAM 18 585.00 MHz -1.10 dBmV 37.64 dB 6056 4610
19 Locked 256QAM 19 591.00 MHz -0.70 dBmV 37.36 dB 5020 5976
20 Locked 256QAM 20 597.00 MHz -0.60 dBmV 37.36 dB 10443 13072
21 Locked 256QAM 21 603.00 MHz -0.40 dBmV 37.36 dB 13428 12265
22 Locked 256QAM 22 609.00 MHz -1.00 dBmV 37.36 dB 22025 15097
23 Locked 256QAM 23 615.00 MHz -0.40 dBmV 37.64 dB 19924 9639
24 Locked 256QAM 24 621.00 MHz -0.90 dBmV 36.61 dB 27166 25786
25 Locked 256QAM 25 627.00 MHz -1.20 dBmV 36.60 dB 1528 5105
26 Locked 256QAM 26 633.00 MHz -1.40 dBmV 36.60 dB 6471 5391
27 Locked 256QAM 27 639.00 MHz -2.30 dBmV 36.20 dB 6537 6117
28 Locked 256QAM 28 645.00 MHz -2.40 dBmV 36.40 dB 9982 5359
29 Locked 256QAM 29 651.00 MHz -1.70 dBmV 36.40 dB 1055 6951
30 Locked 256QAM 30 657.00 MHz -1.80 dBmV 36.20 dB 796 5093
31 Locked 256QAM 31 663.00 MHz -2.50 dBmV 36.60 dB 1016 4764
32 Locked 256QAM 32 669.00 MHz -2.10 dBmV 36.90 dB 1327 5739

 
>
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 1 5120 kSym/s 36.50 MHz 54.00 dBmV
2 Locked ATDMA 4 5120 kSym/s 17.30 MHz 49.00 dBmV
3 Locked ATDMA 3 5120 kSym/s 23.70 MHz 54.00 dBmV
4 ---- ---- 2 ---- 30.10 MHz ----


 

Current System Time: Tue Oct 01 11:23:54 2019

Expert

Re: Constant drops in connection, modem reboots and cannot hold bonded upstream lately

The upstream power is too high and it may be intermittently fluctuating even higher out of spec. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, and latency problems.

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to get the techs involved again.



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New Poster

Re: Constant drops in connection, modem reboots and cannot hold bonded upstream lately

Thanks for the confirmation... Comcast wired the house when we moved in so they can do all that when I get them back out here Smiley Happy I havent installed any splitters myself but the previous owner had a mish mash of comcast and direct TV int he house but the 're-wiring' effort has been solid for two years.. there is an AC plugin amplifier and what looks to be a 'comscope' subscriper amp too in our basment that was installed when the house was re-wired.


@EG wrote:

The upstream power is too high and it may be intermittently fluctuating even higher out of spec. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, and latency problems.

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to get the techs involved again.



@EG wrote:

The upstream power is too high and it may be intermittently fluctuating even higher out of spec. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, and latency problems.

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to get the techs involved again.


 

New Poster

Re: Constant drops in connection, modem reboots and cannot hold bonded upstream lately

FYI. Comcast is telling me the power numbers are within an 'acceptable range' and of course as I am on the phone with them the service is fine, someone is supposed to come out tommorrow again.