Forum Discussion

c0balt's avatar
c0balt
Joining in
11 months ago

Need Help ASAP With Sync Timing Issue ...

I've been experiencing intermittent loss of broadband signal for a few months now. I've put up with it for long enough. The following BQM graphs are from the last 5 days. But I have a couple of months of graphs showing exactly the same thing. My Network Log shows quite clearly that this is a SYNC Timing Synchronization failure - Loss of Sync

Rebooting the system doesn't make any difference. I've checked to make sure all my connections are tightened. I'd like an engineer visit to address the ongoing issues asap. Thanks.

.......

Downstream bonded channels

Channel

Frequency (Hz)

Power (dBmV)

SNR (dB)

Modulation

Channel ID

1

387000000

1.2

35

256 qam

32

2

139000000

2.7

35

256 qam

1

3

147000000

2.9

35

256 qam

2

4

155000000

2.9

35

256 qam

3

5

163000000

2.7

35

256 qam

4

6

171000000

2.7

35

256 qam

5

7

179000000

2.4

35

256 qam

6

8

187000000

2.2

35

256 qam

7

9

195000000

2

35

256 qam

8

10

203000000

1.7

35

256 qam

9

11

211000000

1.5

35

256 qam

10

12

219000000

1

35

256 qam

11

13

227000000

1

35

256 qam

12

14

235000000

1.2

35

256 qam

13

15

299000000

2

35

256 qam

21

16

307000000

2

35

256 qam

22

17

315000000

2.2

35

256 qam

23

18

323000000

2

35

256 qam

24

19

339000000

1.9

35

256 qam

26

20

347000000

1.5

35

256 qam

27

21

355000000

1.5

35

256 qam

28

22

363000000

2

35

256 qam

29

23

371000000

1.7

35

256 qam

30

24

379000000

1.4

35

256 qam

31

 

Downstream bonded channels

Channel

Locked Status

RxMER (dB)

Pre RS Errors

Post RS Errors

1

Locked

35.7

160341

373423

2

Locked

35.5

155601

469198

3

Locked

35.5

175170

478554

4

Locked

35.7

154009

470716

5

Locked

35.5

160718

463135

6

Locked

35.5

170242

471938

7

Locked

35.7

152556

461006

8

Locked

35.5

170819

460889

9

Locked

35.5

164720

458720

10

Locked

35

177538

451623

11

Locked

35

205178

450675

12

Locked

35

201775

448642

13

Locked

35

210429

454224

14

Locked

35

219283

425077

15

Locked

35

215540

402858

16

Locked

35.7

159671

423299

17

Locked

35.5

161059

427630

18

Locked

35.5

160822

414453

19

Locked

35.7

162887

399939

20

Locked

35.7

167893

407648

21

Locked

35.7

157770

413033

22

Locked

35.5

174583

375605

23

Locked

35.7

170645

372924

24

Locked

35.5

173927

381164

 

Upstream bonded channels

Channel

Frequency (Hz)

Power (dBmV)

Symbol Rate (ksps)

Modulation

Channel ID

1

43100000

47.5

5120

64 qam

10

2

23600000

47

5120

64 qam

13

3

30100000

47

5120

64 qam

12

4

36600000

48

5120

64 qam

11

5

49600000

49

5120

64 qam

9

 

Upstream bonded channels

Channel

Channel Type

T1 Timeouts

T2 Timeouts

T3 Timeouts

T4 Timeouts

1

ATDMA

0

0

9

0

2

ATDMA

0

0

9

0

3

ATDMA

0

0

6

0

4

ATDMA

0

0

7

0

5

ATDMA

0

0

11

0

Network Log

Time

Priority

Description

18/05/2024 13:54:16

notice

LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

18/05/2024 13:47:18

Warning!

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

18/05/2024 13:45:47

critical

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

18/05/2024 13:27:37

Warning!

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

18/05/2024 13:27:37

critical

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

18/05/2024 13:26:46

Warning!

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

18/05/2024 13:26:46

critical

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

18/05/2024 13:12:47

Warning!

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

18/05/2024 13:12:47

critical

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

18/05/2024 11:50:0

Warning!

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

18/05/2024 11:50:0

critical

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

18/05/2024 11:45:11

Warning!

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

18/05/2024 11:45:11

critical

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

18/05/2024 11:28:55

Warning!

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

18/05/2024 11:28:32

critical

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

18/05/2024 04:47:37

Warning!

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

18/05/2024 04:47:37

critical

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

18/05/2024 03:57:49

Warning!

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

18/05/2024 03:57:49

critical

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

18/05/2024 03:08:14

Warning!

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

 

 

14 Replies

  • jbrennand's avatar
    jbrennand
    Very Insightful Person

    Not great - but can you start from a clean sheet and do this..

    ___________________________

    Switch the Hub off and unplug it from the mains supply for five minutes. Whilst it's off, do a quick check that all of your coax and ethernet cable connections are in nice and "finger" tight - at the Hub and wall box and also at any connectors etc. Ensure there are no “unterminated cable loose ends. Disconnect all the connections and reconnect to be sure. Also check that the internal wiring is ok with no kinking or chaffing. When its light, check that all looks good with the outside cabling and wall box (no “staples, etc.,) piercing the cables. Then switch the Hub back on and leave ~5 minutes When all done, check back in the settings and ensure that the RS error counts and T3 errors have all reset to 0. Then check every hour or so to see if they start reappearing - they shouldn't. If they do (particularly the postRS and T3 ones) you have a problem (noise) that only a Tech visit will sort.
    Also check the Upstream QAM’s are all at 64

    • c0balt's avatar
      c0balt
      Joining in

      The only thing I wasn't able to do was check outside. As I'm housebound.

      These were taken 5 mins after hub reset ...

      Downstream bonded channels

      Channel

      Frequency (Hz)

      Power (dBmV)

      SNR (dB)

      Modulation

      Channel ID

      1

      387000000

      1.7

      35

      256 qam

      32

      2

      139000000

      3

      35

      256 qam

      1

      3

      203000000

      2

      34

      256 qam

      9

      4

      211000000

      1.7

      35

      256 qam

      10

      5

      219000000

      1.2

      35

      256 qam

      11

      6

      227000000

      1.2

      34

      256 qam

      12

      7

      235000000

      1.4

      35

      256 qam

      13

      8

      243000000

      1.2

      35

      256 qam

      14

      9

      251000000

      1

      35

      256 qam

      15

      10

      259000000

      1.2

      35

      256 qam

      16

      11

      267000000

      1.7

      35

      256 qam

      17

      12

      275000000

      2.2

      35

      256 qam

      18

      13

      283000000

      2

      35

      256 qam

      19

      14

      291000000

      1.7

      35

      256 qam

      20

      15

      299000000

      2.2

      35

      256 qam

      21

      16

      307000000

      2.2

      35

      256 qam

      22

      17

      315000000

      2.5

      35

      256 qam

      23

      18

      323000000

      2.5

      35

      256 qam

      24

      19

      339000000

      2.2

      35

      256 qam

      26

      20

      347000000

      1.9

      35

      256 qam

      27

      21

      355000000

      2

      35

      256 qam

      28

      22

      363000000

      2.2

      35

      256 qam

      29

      23

      371000000

      2

      35

      256 qam

      30

      24

      379000000

      1.7

      35

      256 qam

      31

       

      Downstream bonded channels

      Channel

      Locked Status

      RxMER (dB)

      Pre RS Errors

      Post RS Errors

      1

      Locked

      35.5

      21

      263

      2

      Locked

      35.5

      27

      168

      3

      Locked

      34.9

      29

      248

      4

      Locked

      35

      19

      250

      5

      Locked

      35

      22

      201

      6

      Locked

      34.9

      30

      208

      7

      Locked

      35

      33

      189

      8

      Locked

      35

      18

      276

      9

      Locked

      35

      22

      280

      10

      Locked

      35.5

      21

      318

      11

      Locked

      35.5

      27

      160

      12

      Locked

      35.7

      26

      256

      13

      Locked

      35.5

      30

      203

      14

      Locked

      35.5

      20

      243

      15

      Locked

      35.5

      30

      181

      16

      Locked

      35.5

      21

      216

      17

      Locked

      35.5

      37

      172

      18

      Locked

      35.7

      30

      262

      19

      Locked

      35.7

      18

      304

      20

      Locked

      35.5

      16

      164

      21

      Locked

      35.7

      17

      167

      22

      Locked

      35.7

      15

      251

      23

      Locked

      35.7

      21

      298

      24

      Locked

      35.7

      25

      188

       

      Upstream bonded channels

      Channel

      Frequency (Hz)

      Power (dBmV)

      Symbol Rate (ksps)

      Modulation

      Channel ID

      1

      43099998

      46.5

      5120

      64 qam

      10

      2

      23600017

      45

      5120

      64 qam

      13

      3

      30100019

      46.5

      5120

      64 qam

      12

      4

      36600004

      46.5

      5120

      64 qam

      11

      5

      49600019

      48.5

      5120

      64 qam

      9

       

      Upstream bonded channels

      Channel

      Channel Type

      T1 Timeouts

      T2 Timeouts

      T3 Timeouts

      T4 Timeouts

      1

      ATDMA

      0

      0

      0

      0

      2

      ATDMA

      0

      0

      0

      0

      3

      ATDMA

      0

      0

      0

      0

      4

      ATDMA

      0

      0

      0

      0

      5

      ATDMA

      0

      0

      0

      0

      Network Log

      Time

      Priority

      Description

      18/05/2024 16:46:54

      notice

      LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

      18/05/2024 16:46:41

      Warning!

      LAN login FAILED : Incorrect Username / Password / ConnectionType;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

      18/05/2024 16:31:6

      Warning!

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

      18/05/2024 16:31:6

      critical

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

      18/05/2024 16:30:54

      Warning!

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

      18/05/2024 16:30:54

      critical

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

      18/05/2024 16:30:50

      Warning!

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

      18/05/2024 16:30:50

      critical

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

      18/05/2024 16:26:58

      Warning!

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

      18/05/2024 16:25:33

      critical

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

      18/05/2024 14:34:43

      Warning!

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

      18/05/2024 14:26:24

      critical

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

      18/05/2024 13:55:46

      Warning!

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

      18/05/2024 13:55:46

      critical

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

      18/05/2024 13:54:16

      notice

      LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

      18/05/2024 13:47:18

      Warning!

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

      18/05/2024 13:45:47

      critical

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

      18/05/2024 13:27:37

      Warning!

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

      18/05/2024 13:27:37

      critical

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

      18/05/2024 13:26:46

      Warning!

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

       

       

      • jbrennand's avatar
        jbrennand
        Very Insightful Person

        OK - thats not good - too many PostRS Errors, SNR's are all low and the BQM looks awful.

        What devices do you have connected to the Hub on ethernet cables ?

        A VM Person will be along here soon and take a look for you