Re: Arris Surfboard SB8200 DOCSIS 3.1 Modem - SYNC timing synchronization failures

Hi @ComcastChe, I am currently having the same issue as OP. I had a tech come out a few weeks ago and they added a splitter with termination caps and added a MoCa filter, even though I only subscribe to gigabit internet service with Comcast. I also have the line coming into the residence plugged directly into the splitter and then a few inches of cable into the modem. Over the past couple of weeks, the modem has been dropping connection each night. After unplugging the modem and plugging it back in, it restarts.

 

Could you please help take a look at my account? 

 

Modem Errors: 

 

1. Honoring MDD; IP provisioning mode = IPv6

2. SYNC Timing Synchronization failure - Failed to acquire QAM/APSK symbol timing

3. No Ranging Response received - T3 time out

4. Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out

 

Software Version: 

AB01.01.009.32.01_122319_183.0A.NSH

 

Hardware Version: 6

 

Xfinity Speedtest 4/17/2020 7:39 am

 

Download Speed: 904.8 Mbps

Upload Speed: 38.9 Mbps

Latency: 20 ms

 

Downstream Bonded channels:

 

Channel ID	Lock Status	Modulation	Frequency	Power	SNR/MER	Corrected	Uncorrectables
33	Locked	QAM256	627000000 Hz	1.5 dBmV	40.9 dB	641	0
9	Locked	QAM256	477000000 Hz	0.5 dBmV	41.4 dB	1256	0
10	Locked	QAM256	483000000 Hz	0.7 dBmV	41.3 dB	1308	0
11	Locked	QAM256	489000000 Hz	0.9 dBmV	41.4 dB	1357	0
12	Locked	QAM256	495000000 Hz	1.0 dBmV	41.2 dB	1285	0
13	Locked	QAM256	507000000 Hz	1.4 dBmV	41.3 dB	1188	0
14	Locked	QAM256	513000000 Hz	1.4 dBmV	41.4 dB	1183	0
15	Locked	QAM256	519000000 Hz	1.3 dBmV	41.2 dB	1175	0
16	Locked	QAM256	525000000 Hz	1.0 dBmV	41.2 dB	1135	0
17	Locked	QAM256	531000000 Hz	1.0 dBmV	41.2 dB	1186	0
18	Locked	QAM256	537000000 Hz	1.0 dBmV	41.0 dB	1175	0
19	Locked	QAM256	543000000 Hz	1.2 dBmV	41.2 dB	1061	0
20	Locked	QAM256	549000000 Hz	1.3 dBmV	41.3 dB	1035	0
21	Locked	QAM256	555000000 Hz	1.6 dBmV	41.3 dB	976	0
22	Locked	QAM256	561000000 Hz	1.6 dBmV	41.3 dB	1008	0
23	Locked	QAM256	567000000 Hz	1.6 dBmV	41.2 dB	1039	0
24	Locked	QAM256	573000000 Hz	1.7 dBmV	41.4 dB	984	0
25	Locked	QAM256	579000000 Hz	2.0 dBmV	41.5 dB	876	0
26	Locked	QAM256	585000000 Hz	2.0 dBmV	41.4 dB	820	0
27	Locked	QAM256	591000000 Hz	1.8 dBmV	41.4 dB	835	0
28	Locked	QAM256	597000000 Hz	1.7 dBmV	41.1 dB	831	0
29	Locked	QAM256	603000000 Hz	1.5 dBmV	41.0 dB	806	0
30	Locked	QAM256	609000000 Hz	1.4 dBmV	41.1 dB	715	0
31	Locked	QAM256	615000000 Hz	1.5 dBmV	41.0 dB	660	0
32	Locked	QAM256	621000000 Hz	1.7 dBmV	41.3 dB	578	0
34	Locked	QAM256	633000000 Hz	1.5 dBmV	40.8 dB	729	0
35	Locked	QAM256	639000000 Hz	1.6 dBmV	40.9 dB	657	0
36	Locked	QAM256	645000000 Hz	1.7 dBmV	41.1 dB	525	0
37	Locked	QAM256	651000000 Hz	2.0 dBmV	41.3 dB	417	0
38	Locked	QAM256	657000000 Hz	2.5 dBmV	41.2 dB	430	0
39	Locked	QAM256	663000000 Hz	2.3 dBmV	40.9 dB	501	0
40	Locked	QAM256	669000000 Hz	1.7 dBmV	40.8 dB	548	0
159	Locked	Other	678000000 Hz	2.6 dBmV	39.8 dB	123042379	0

 

Upstream Bonded channels:

 

Channel	Channel ID	Lock Status	US Channel Type	Frequency	Width	Power
1	3	Locked	SC-QAM Upstream	23700000 Hz	6400000 Hz	43.0 dBmV
2	1	Locked	SC-QAM Upstream	36500000 Hz	6400000 Hz	43.0 dBmV
3	2	Locked	SC-QAM Upstream	30100000 Hz	6400000 Hz	43.0 dBmV
4	4	Locked	SC-QAM Upstream	17300000 Hz	6400000 Hz	43.0 dBmV