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SYNC Timing Synchronization failure

Don't know what to do about it. Here's logs. It's been happening over the past week, and powercycling the Hub 3 temporarily fixes it and then it's annoying me again.

Downstream bonded channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1139000000-2.238256 qam1
2147000000-1.238256 qam2
3155000000-1.238256 qam3
4163000000-2.438256 qam4
5171000000-2.438256 qam5
6179000000-1.938256 qam6
7187000000-1.538256 qam7
8195000000-1.440256 qam8
9203000000-1.538256 qam9
10211000000-1.738256 qam10
11219000000-1.736256 qam11
12227000000-1.737256 qam12
13235000000-1.238256 qam13
14243000000-140256 qam14
15251000000-0.938256 qam15
16259000000-140256 qam16
17267000000-1.240256 qam17
18275000000-1.238256 qam18
19283000000-140256 qam19
20291000000-0.738256 qam20
21299000000-0.238256 qam21
22307000000-0.540256 qam22
23315000000-0.538256 qam23
24323000000-0.738256 qam24



Downstream bonded channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors

1Locked38.62683218400
2Locked38.9148533394
3Locked38.9152318750
4Locked38.9152673534
5Locked38.61878011075
6Locked38.9117842350
7Locked38.9148064278
8Locked40.3126267787
9Locked38.91230225612
10Locked38.91165425768
11Locked36.6129799652
12Locked37.688952848
13Locked38.9111165863
14Locked40.347332025
15Locked38.988877908
16Locked40.370106221
17Locked40.31629305
18Locked38.94183841
19Locked40.377181896
20Locked38.91346214445
21Locked38.6135119411
22Locked40.389423400
23Locked38.94013567
24Locked38.6814256

 

Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

14620000051512032 qam3
23940002950.8512064 qam4
35370000051512064 qam2
46030000051512064 qam1



Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1ATDMA0000
2ATDMA0010
3ATDMA0000
4ATDMA0010

 

e84d6deda574a3ff86b4e5ccb92772a73e3fad06-14-11-2020.png

 

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Re: SYNC Timing Synchronization failure

General Configuration

Network access
Allowed
Maximum Number of CPEs
1
Baseline Privacy
Enabled
DOCSIS Mode
Docsis30
Config file
cmreg-vmdg505-bbt060-b.cm



Primary Downstream Service Flow

SFID314120
Max Traffic Rate230000061
Max Traffic Burst42600
Min Traffic Rate0



Primary Upstream Service Flow

SFID314119
Max Traffic Rate22000061
Max Traffic Burst42600
Min Traffic Rate0
Max Concatenated Burst42600
Scheduling TypeBestEffort

 

Network Log

Time Priority Description

14/11/2020 12:28:59criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
14/11/2020 12:28:59Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
14/11/2020 12:26:29criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
14/11/2020 12:08:19Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
14/11/2020 12:00:12criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
14/11/2020 08:03:15Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
14/11/2020 08:02:38criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
14/11/2020 07:45:45Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
13/11/2020 19:18:23ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/11/2020 10:54:20Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/11/2020 10:45:57noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/11/2020 10:15:24Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/11/2020 10:15:24criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/11/2020 08:48:51Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/11/2020 08:48:50criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/11/2020 08:48:50Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
11/11/2020 04:04:21criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
10/11/2020 13:41:13ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
09/11/2020 09:01:44noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
08/11/2020 20:10:15criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
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Alessandro Volta
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Re: SYNC Timing Synchronization failure

Three of your Upstream Power Levels are maxed out and one channel is on the wrong modulation, it should be at 64 QAM.

This will need an engineer to put right.

You can either call in (08:00 is the best time) or wait on here for a few days (6 to 7 days average) until one of the VM Forum Staff comes along.

If you wait on here Do Not bump the thread it will put it further down the VM 'to do list'.

 

Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

14620000051512032 qam3
23940002950.8512064 qam4
35370000051512064 qam2
46030000051512064 qam1

 

***********************************************************************************************************************************

Mike Robinson
Semi-Retired Aircraft Engineer & Computer Based Training and Learning Designer for many of the world's Military Arms.

My Broadband Ping - Mike Robbo
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Forum Team
Forum Team
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Re: SYNC Timing Synchronization failure

Hi emptyanomaly,

 

Thanks for posting and welcome to our community 🙂

 

I've been able to locate your account using your forum details and can see there's been a recent reboot, the hub is showing to be within the specifications we would expect, and the upstream modulation are all showing at 64 QAM now.

 

Please let me know if you are still experiencing issues with it. 

 

Alex_Rm

 

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Re: SYNC Timing Synchronization failure

Still having issues with the same problems. Modulation is all 64 but 3 of the channels still sit at 51 dbmv.

 

 

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