Frequent T3 & T4 time-outs on modem

[AntenDS]

I have my own Arris (Motorola) SURFboard SB6141 modem for about 4.5 years and had what i think was a similar issue with my old SB6121 prior to the swap. History of the issue, my modem would loss connection and reboot constantly. I would get about 2-3 tech visits each year to "fix" it though about 3 years ago a tech added a comscope subscriber amplifier,  it worked well till a late last month.  A recent tech said the outside portion had water damage which resulted in constant drops, he was my first of two tech visits. The drops start small ranging for about 1-5 minutes then progress to 30-90 minutes and at its worse hours of the up and down stream lights blinking.

Tech Visit 1:  Said the comscope thing outside was water damaged and also didn't know why they tech would install it on a single modem, did mention the signal was way too weak for internet service. He connected the modem up with my two little Comcast digital converter boxes and said the signal was great, i guess the modem was running off a line paired with another apartment. Within 12 hours it started to have micro drops for 5-10 seconds then days later have multiple drops ranging from 30-60 minutes and reached its peak of hours.  Side note my digital converter boxes don't show active on my Xfinity App anymore. So i cannot ID them or reboot via the App.

Tech Visit 2: The tech went to the pole, worked his tech magic (i have no idea what he did) and replaced all coax going to the modem from the pole to inside. The modem didn't reboot for 30 hours after tech visit and not it seems to only stay up for 4-9 hours before it will randomly rebooted 3 times in 30-60 minutes.

I don't know if I need the amplifier or a new modem, hoping the later because i can do it myself.

Downstream Bonding Channel Value

Channel ID	37	33	34	35	36	38	39	40
Frequency	675000000 Hz	651000000 Hz	657000000 Hz	663000000 Hz	669000000 Hz	681000000 Hz	687000000 Hz	693000000 Hz
Signal to Noise Ratio	38 dB	37 dB	37 dB	38 dB	38 dB	38 dB	38 dB	38 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	0 dBmV	0 dBmV	0 dBmV	0 dBmV	0 dBmV	-1 dBmV	-1 dBmV	-1 dBmV

Upstream Bonding Channel Value

Channel ID	5	8	7	6
Frequency	36500000 Hz	17300000 Hz	23700000 Hz	30100000 Hz
Ranging Service ID	4241	4241	4241	4241
Symbol Rate	5.120 Msym/sec	5.120 Msym/sec	5.120 Msym/sec	5.120 Msym/sec
Power Level	49 dBmV	48 dBmV	47 dBmV	49 dBmV
Upstream Modulation	[2] QPSK [1] 16QAM [3] 64QAM	[2] QPSK [1] 16QAM [3] 64QAM	[2] QPSK [1] 16QAM [3] 64QAM	[2] QPSK [1] 16QAM [3] 64QAM
Ranging Status	Success	Success	Success	Success

Signal Status (Codewords) Bonding Channel Value

Channel ID	37	33	34	35	36	38	39	40
Total Unerrored Codewords	389083226	389201611	389191456	389209211	389148935	389140139	389100436	389105042
Total Correctable Codewords	1288	1269	1215	1179	1225	1238	1174	1164
Total Uncorrectable Codewords	1323	1176	1180	1216	1228	1210	2248	1325

Time Priority Code Message

Jul 23 2020 21:13:31	3-Critical	R05.0	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 21:13:08	3-Critical	R02.0	No Ranging Response received - T3 time-out;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 21:12:51	4-Error	C701.0	DBC-ACK not received;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 21:12:49	5-Warning	U102.0	TCS Partial Service;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 21:12:49	3-Critical	R07.0	Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 21:12:31	3-Critical	R02.0	No Ranging Response received - T3 time-out;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 20:59:06	3-Critical	R06.0	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 20:59:06	3-Critical	R03.0	Ranging Request Retries exhausted;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 20:58:46	3-Critical	R02.0	No Ranging Response received - T3 time-out;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 20:58:26	3-Critical	R06.0	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 20:58:26	3-Critical	R03.0	Ranging Request Retries exhausted;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 20:58:06	3-Critical	R02.0	No Ranging Response received - T3 time-out;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 20:57:46	3-Critical	R06.0	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 20:57:46	3-Critical	R03.0	Ranging Request Retries exhausted;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 20:57:23	3-Critical	R02.0	No Ranging Response received - T3 time-out;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 20:57:05	3-Critical	R06.0	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 20:57:05	3-Critical	R03.0	Ranging Request Retries exhausted;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 20:57:04	3-Critical	R02.0	No Ranging Response received - T3 time-out;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 20:52:45	3-Critical	R07.0	Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;
Jul 23 2020 20:52:09	3-Critical	R02.0	No Ranging Response received - T3 time-out;CM-MAC=10:05:b1:f6:a2:c8;CMTS-MAC=00:fe:c8:06:75:5b;CM-QOS=1.1;CM-VER=3.0;

Thanks in advance

[EG]

The upstream power is on the high side / almost out of spec. If that Commscope amp is a straight drop amp / zero loss type, perhaps an amp with an active return needs to be used instead.

https://www.xfinity.com/support/articles/drop-amplifiers

http://www.cabletvamps.com/Info/TV_AMP_EDUCATION.htm

[AntenDS]

That second link went way over my head, i would have to ask the RF engineer at my job.  I no longer have the comscope amp, it was tossed by the tech and the wall-wart portion i was told i no longer need. No one explained to me what it did on a technical aspect so for a replacement I wouldn't know what version i needed. The one who installed it just told me to never unplug the wall-wart adpater and i didn't know of the outside portion till the first tech this year came out. 

Would i sorce one of these myself or have comcast install it?

[EG]

Either but in this case, it would probably be easier to let a Comcast premises tech come out and decide what is needed. Good luck with it !!

[AntenDS]

Thanks, hopefully i can see if they can do it.