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Constantly getting SYNC Timing Synchronization failure - Loss of Sync network error

Unhappy20
Joining in

I have been constantly experiencing lost of internet for the past month, internet keep disconnecting in random time and am really annoyed about this. 
The network log shows multiple SYNC Timing Synchronization failure - Loss of Sync and No Ranging Response received - T3 time-out error.

Network Log

Time

Priority

Description

21/04/2024 00:42:16

critical

No Ranging Response received - T3 time-out;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

20/04/2024 21:48:30

critical

SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

20/04/2024 21:48:30

Warning!

RCS Partial Service;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

20/04/2024 21:48:30

critical

SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

20/04/2024 21:48:30

Warning!

RCS Partial Service;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

20/04/2024 21:48:19

Warning!

Lost MDD Timeout;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

20/04/2024 21:48:18

Warning!

RCS Partial Service;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

20/04/2024 21:48:15

critical

SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

20/04/2024 21:48:15

Warning!

RCS Partial Service;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

20/04/2024 21:48:15

critical

SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

20/04/2024 21:48:14

Warning!

RCS Partial Service;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

20/04/2024 03:45:49

critical

No Ranging Response received - T3 time-out;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

19/04/2024 21:40:56

Error

DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

16/04/2024 12:39:34

critical

No Ranging Response received - T3 time-out;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

16/04/2024 09:40:56

Error

DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

12/04/2024 22:28:33

critical

No Ranging Response received - T3 time-out;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

12/04/2024 21:40:56

Error

DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

10/04/2024 01:14:22

critical

No Ranging Response received - T3 time-out;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

09/04/2024 09:40:56

Error

DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=xxxxxxxxx;CMTS-MAC=xxxxxxxxx;CM-QOS=1.1;CM-VER=3.0;

 

 

5 REPLIES 5

Client62
Legend

Share the Upstream & Downstream tabs in the same way, the connection stats often reveal more than the Hub log.

VM Hub induced random Wi-Fi disconnects are often fixed by disabling Smart Wi-Fi in the Hub admin menu
and setting fixed Wi-Fi channels on both the 2.4 & 5 GHz bands.

Downstream bonded channels

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

120275000013.340256 qam9
213875000013.938256 qam1
314675000014.140256 qam2
415475000013.638256 qam3
516275000013.638256 qam4
61707500001438256 qam5
71787500001440256 qam6
818675000013.938256 qam7
919475000013.640256 qam8
102107500001338256 qam10
112187500001340256 qam11
1222675000012.938256 qam12
1323475000012.540256 qam13
1424275000012.540256 qam14
1525075000013.138256 qam15
162587500001338256 qam16
1726675000012.838256 qam17
182747500001340256 qam18
1928275000013.540256 qam19
2029075000013.338256 qam20
212987500001338256 qam21
223067500001340256 qam22
2331475000013.540256 qam23
2432275000013.840256 qam24

 



Downstream bonded channels

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

1Locked40.32966570
2Locked38.94546808
3Locked40.34077102
4Locked38.92437277
5Locked38.94546767
6Locked38.94556469
7Locked40.34386647
8Locked38.95096694
9Locked40.32366404
10Locked38.95726177
11Locked40.35137735
12Locked38.94287776
13Locked40.35617666
14Locked40.94806837
15Locked38.95097553
16Locked38.95747720
17Locked38.94597343
18Locked40.35176604
19Locked40.34176269
20Locked38.94006733
21Locked38.95047694
22Locked40.96525453
23Locked40.34835565
24Locked40.94945530

Upstream bonded channels

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

13659994932.8512064 qam3
23009979832.5512064 qam4
34310026533.3512064 qam2
42359976332512064 qam9
54959999733.8512064 qam1



Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1ATDMA00200
2ATDMA00140
3ATDMA00170
4ATDMA0060
5ATDMA00150

Unhappy20
Joining in

Tried to reboot Hubs but still doesn't help. Can anyone advise?

Hi there @Unhappy20 

Thank you so much for your post and welcome to the community forums, it's great to have you here. 

I am so sorry that you have faced this issue with your service and thank you so much again for your post here. I have taken a look on our side and I can see that there are a few issues with the Hub that will require an engineer to take a look. I'm going to pop you a private message so that we can get this appointment arranged. 

I will pop you a PM across now, please keep an eye out for the envelope at the top of your screen alerting you to a new message.