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

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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