Intermittent loss of block sync - T3 time out

Question

Over the last couple of weeks, as i'm working from home more and more, I'm seeing intermittent time out issues and loss of block sync between modem and Comcast in my area. These can last from a short time, a minute or so, to several over the course of hours.

My modem is a Motorola MB8600. An example of logs is below:

13:55:19 Wed Oct 14 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 5; Chan ID: 1; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
13:55:20 Wed Oct 14 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 6; Chan ID: 1; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
13:55:23 Wed Oct 14 2020	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
13:55:23 Wed Oct 14 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 2; Chan ID: 5 12; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
13:55:25 Wed Oct 14 2020	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
13:55:26 Wed Oct 14 2020	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
13:56:59 Wed Oct 14 2020	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
13:56:59 Wed Oct 14 2020	Warning (5)	B-INIT-RNG Failure - Retries exceeded;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
13:58:01 Wed Oct 14 2020	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
13:58:01 Wed Oct 14 2020	Warning (5)	B-INIT-RNG Failure - Retries exceeded;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
13:59:35 Wed Oct 14 2020	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
13:59:35 Wed Oct 14 2020	Warning (5)	B-INIT-RNG Failure - Retries exceeded;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
14:00:47 Wed Oct 14 2020	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
14:00:47 Wed Oct 14 2020	Warning (5)	B-INIT-RNG Failure - Retries exceeded;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
14:01:06 Wed Oct 14 2020	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
14:01:16 Wed Oct 14 2020	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
14:01:19 Wed Oct 14 2020	Warning (5)	RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
14:01:19 Wed Oct 14 2020	Warning (5)	Dynamic Range Window violation
14:01:19 Wed Oct 14 2020	Warning (5)	RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
14:01:19 Wed Oct 14 2020	Warning (5)	Dynamic Range Window violation
14:01:19 Wed Oct 14 2020	Warning (5)	RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
14:01:19 Wed Oct 14 2020	Warning (5)	Dynamic Range Window violation
14:01:20 Wed Oct 14 2020	Warning (5)	RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
14:01:20 Wed Oct 14 2020	Warning (5)	Dynamic Range Window violation
14:01:20 Wed Oct 14 2020	Warning (5)	RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
14:01:20 Wed Oct 14 2020	Warning (5)	Dynamic Range Window violation
14:01:20 Wed Oct 14 2020	Warning (5)	RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
14:01:20 Wed Oct 14 2020	Warning (5)	Dynamic Range Window violation
15:21:15 Wed Oct 14 2020	Warning (5)	RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
15:21:15 Wed Oct 14 2020	Warning (5)	Dynamic Range Window violation
15:43:31 Wed Oct 14 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0.;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;
15:43:50 Wed Oct 14 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 159; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0.;CM-MAC=00:40:36:61:67:47;CMTS-MAC=00:b6:70:99:b3:22;CM-QOS=1.1;CM-VER=3.1;

Current power levels are below:

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Freq. (MHz)	Pwr (dBmV)	SNR (dB)	Corrected	Uncorrected
1	Locked	QAM256	25	627.0	-2.9	38.9	9036	11095
2	Locked	QAM256	1	459.0	-3.1	40.0	21562	27307
3	Locked	QAM256	2	465.0	-2.8	40.1	19897	27706
4	Locked	QAM256	3	471.0	-2.9	39.9	32137	55111
5	Locked	QAM256	4	477.0	-3.0	39.6	90128	97766
6	Locked	QAM256	5	483.0	-3.4	30.4	14533688	5864587
7	Locked	QAM256	6	489.0	-3.1	32.3	1009568	158091
8	Locked	QAM256	7	519.0	-2.9	37.3	97133	99638
9	Locked	QAM256	8	525.0	-1.9	38.9	104112	94464
10	Locked	QAM256	9	531.0	-1.7	38.3	94204	91095
11	Locked	QAM256	10	537.0	-1.9	39.2	30529	53257
12	Locked	QAM256	11	543.0	-2.4	35.5	107745	104757
13	Locked	QAM256	12	549.0	-2.2	30.6	21696524	18152502
14	Locked	QAM256	13	555.0	-1.8	35.5	111129	93675
15	Locked	QAM256	14	561.0	-2.0	36.1	103257	91435
16	Locked	QAM256	15	567.0	-2.1	37.8	114083	94279
17	Locked	QAM256	16	573.0	-2.4	39.5	110539	89347
18	Locked	QAM256	17	579.0	-1.9	39.6	115730	84094
19	Locked	QAM256	18	585.0	-1.7	39.9	102900	74172
20	Locked	QAM256	19	591.0	-1.9	39.8	30367	57977
21	Locked	QAM256	20	597.0	-2.0	37.3	30772	59301
22	Locked	QAM256	21	603.0	-2.6	38.3	107593	72434
23	Locked	QAM256	22	609.0	-2.4	39.3	27863	51888
24	Locked	QAM256	23	615.0	-2.5	39.5	116087	89505
25	Locked	QAM256	24	621.0	-2.5	39.2	21992	39614
26	Locked	QAM256	26	633.0	-3.2	39.0	29044	55965
27	Locked	QAM256	27	639.0	-2.9	39.3	119456	83304
28	Locked	QAM256	28	645.0	-3.3	39.2	120325	75304
29	Locked	QAM256	29	651.0	-3.0	39.3	25067	44963
30	Locked	QAM256	30	657.0	-3.0	39.2	121405	64989
31	Locked	QAM256	31	663.0	-3.3	39.0	120556	81635
32	Locked	QAM256	32	669.0	-3.2	39.3	26659	48151
33	Locked	OFDM PLC	159	805.0	-5.1	34.0	-1974911552	105865

Upstream Bonded Channels

Channel	Lock Status	Channel Type	Channel ID	Symb. Rate (Ksym/sec)	Freq. (MHz)	Pwr (dBmV)
1	Locked	SC-QAM	1	5120	36.5	41.8
2	Locked	SC-QAM	2	5120	30.1	41.8
3	Locked	SC-QAM	3	5120	23.7	40.8
4	Locked	SC-QAM	4	5120	17.3	39.8

You can see lots of EC in the downstream channels, mostly from block sync loss, presumably. PC is connected to router by ethernet, but all wifi devices lose connection as well.

Any advice or assitance would be greatly appreciated.

Your Home Network

mpking

Intermittent loss of block sync - T3 time out

Responses

No Responses!

New to the Community?