MDD Timeout and T3 Timout

[nwoghost]

Here to confirm the problem is on Comcasts end and need to have a tech visit. Again...Do not want to deal with customer service telling me to keep restarting the modem.....over....and over....

New customer, less than a month, already very displeased for background.

I have started to read around but still not sure what I am looking for: all connections that I can access are tight, Comcast tech removed amplifier from prior instalation, replaced splitter with 5-1002 MHz unit. No other uncessary splitters. 

Here is my Motorola MB7621 information after a few resets already today:

Startup Sequence

Startup Step Status Comment       Acquire Downstream Channel 429000000 Hz Locked       Upstream Connection OK Operational       Boot State OK Operational       Configuration File OK d11_m_mb7621_speedtierextreme2_c01.cm       Security Enabled BPI+

Connection Status

System Up Time 0 days 00h:16m:33s         Network Access Allowed

Downstream Bonded Channels

Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected 1 Locked QAM256 1 429.0 -6.7 40.0 0 0 2 Locked QAM256 2 435.0 -7.0 39.8 0 0 3 Locked QAM256 3 447.0 -7.2 39.4 0 0 4 Locked QAM256 4 453.0 -7.1 38.0 0 0 5 Locked QAM256 5 459.0 -7.2 39.6 0 0 6 Locked QAM256 6 465.0 -7.5 39.3 0 0 7 Locked QAM256 7 471.0 -8.0 38.7 0 0 8 Locked QAM256 8 477.0 -7.8 39.5 0 0 9 Locked QAM256 9 483.0 -7.8 39.5 0 0 10 Locked QAM256 10 489.0 -8.1 39.5 0 0 11 Locked QAM256 11 495.0 -8.1 39.5 0 0 12 Locked QAM256 12 501.0 -7.8 36.4 0 0 13 Locked QAM256 13 507.0 -7.9 35.8 0 0 14 Locked QAM256 14 513.0 -8.6 36.8 0 0 15 Locked QAM256 15 519.0 -9.2 37.4 0 0 16 Locked QAM256 16 525.0 -9.2 0.0 2186 11529 17 Not Locked Unknown 0 531.0 0.0 0.0 5900887 738348 18 Not Locked Unknown 0 537.0 0.0 0.0 1790735 843404 19 Locked QAM256 19 543.0 -8.7 27.9 838814 178412 20 Locked QAM256 20 549.0 -8.5 32.9 0 0 21 Not Locked Unknown 0 555.0 0.0 0.0 1529479 980320 22 Not Locked Unknown 0 561.0 0.0 0.0 4067669 2626736 23 Locked QAM256 23 567.0 -8.1 31.6 971 0 24 Locked QAM256 24 573.0 -7.7 31.3 151 0 Total             14130892 5378749

Upstream Bonded Channels

Channel Lock Status Channel Type Channel ID Symb. Rate (Ksym/sec) Freq. (MHz) Pwr (dBmV) 1 Locked ATDMA 2 5120 29.2 49.3 2 Locked ATDMA 1 5120 35.6 50.8 3 Locked ATDMA 3 5120 22.8 49.3 4 Locked ATDMA 4 5120 16.4 49.3 5 Not Locked Unknown 0 0 0 0.0 6 Not Locked Unknown 0 0 0 0.0 7 Not Locked Unknown 0 0 0 0.0 8 Not Locked Unknown 0 0 0 0.0

Wed Jul 29 07:30:01 2020	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=00:40:36:69:cc:97;CMTS-MAC=b0:90:7e:0e:9b:20;CM-QOS=1.1;CM-VER=3.0;
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
Wed Jul 29 16:18:22 2020	Warning (5)	MDD message timeout;CM-MAC=00:40:36:69:cc:97;CMTS-MAC=b0:90:7e:0e:9b:20;CM-QOS=1.1;CM-VER=3.0;
Wed Jul 29 16:18:23 2020	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=00:40:36:69:cc:97;CMTS-MAC=b0:90:7e:0e:9b:20;CM-QOS=1.1;CM-VER=3.0;
Wed Jul 29 16:22:33 2020	Warning (5)	MDD message timeout;CM-MAC=00:40:36:69:cc:97;CMTS-MAC=b0:90:7e:0e:9b:20;CM-QOS=1.1;CM-VER=3.0;

[EG]

The upstream power is on the high side and it may be intermittently fluctuating even higher to out of spec levels. The downstream power is on the weak side as well. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

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 book a tech visit to investigate and correct.

[nwoghost]

"The upstream power is on the high side and it may be intermittently fluctuating even higher to out of spec levels. The downstream power is on the weak side as well. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels."

- thank you for replying.

"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"

- As noted in OP, Comcast replaced the 1 splitter I can find, otherwise there are no other ones. 

- I cannot access the box on the side of the house so unsure what is there.

"then perhaps it's best to book a tech visit to investigate and correct." 

- Yes my likely next course of action

- Do you know how to do this in the most pain-free way?

[EG]

Yeah. 1800comcast. Good luck with it !

[nwoghost]

So the painful way. Yes well see on the luck part!

[nwoghost · Accepted solution]

For anyone else dealing with this problem. 

After trying 2 different hookups in the house and again tighting connections including taking off wall plates to check those, I reached out to Amazon to send a new modem thinking what the heck.....

Here are my values after 24 hours of no drops, and no resets. 

Downstream Bonded Channels

Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected 1 Locked QAM256 9 483.0 1.1 41.0 0 0 2 Locked QAM256 2 435.0 1.7 41.8 0 0 3 Locked QAM256 3 447.0 1.4 41.4 26 0 4 Locked QAM256 4 453.0 1.2 41.2 0 0 5 Locked QAM256 5 459.0 0.7 40.9 0 0 6 Locked QAM256 6 465.0 0.7 40.9 0 0 7 Locked QAM256 7 471.0 0.8 40.7 0 0 8 Locked QAM256 8 477.0 1.1 41.1 0 0 9 Locked QAM256 1 429.0 1.7 42.0 0 0 10 Locked QAM256 10 489.0 0.7 40.7 0 0 11 Locked QAM256 11 495.0 0.7 40.7 0 0 12 Locked QAM256 12 501.0 1.0 40.8 0 0 13 Locked QAM256 13 507.0 0.7 37.4 0 0 14 Locked QAM256 14 513.0 0.1 40.2 0 0 15 Locked QAM256 15 519.0 0.0 40.2 0 0 16 Locked QAM256 16 525.0 0.0 40.2 0 0 17 Locked QAM256 17 531.0 -0.2 41.8 0 0 18 Locked QAM256 18 537.0 -0.4 41.6 0 0 19 Locked QAM256 19 543.0 -0.4 41.5 0 0 20 Locked QAM256 20 549.0 0.2 41.7 0 0 21 Locked QAM256 21 555.0 0.4 41.6 4 0 22 Locked QAM256 22 561.0 0.5 41.5 0 0 23 Locked QAM256 23 567.0 0.9 41.6 0 0 24 Locked QAM256 24 573.0 0.7 41.3 0 0 Total             30 0

Upstream Bonded Channels

Channel Lock Status Channel Type Channel ID Symb. Rate (Ksym/sec) Freq. (MHz) Pwr (dBmV) 1 Locked ATDMA 4 5120 16.4 44.0 2 Locked ATDMA 1 5120 35.6 45.5 3 Locked ATDMA 2 5120 29.2 43.9 4 Locked ATDMA 3 5120 22.8 43.9 5 Not Locked Unknown 0 0 0 0.0 6 Not Locked Unknown 0 0 0 0.0 7 Not Locked Unknown 0 0 0 0.0 8 Not Locked Unknown 0 0 0 0.0

tldr: get a new modem sometimes. 

[EG]

Glad it's better but FWIW, something must have changed with the line / connection. A new / different modem can not correct the power levels like that. A bad connection condition will still be there no matter what modem is used. A new modem is not an automatic blanket answer for everyone. YMMV.