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javidm
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Variable speeds with low SNR and high errors

Dear Team

I am on a 350 Mbps package and my speeds vary greatly between low 20s and high 90s most of the time, occasionally going upto 200 and very occasionally above 200. The speed can vary considerably on consecutive speed tests. I have tested the speeds with a Cat 5e ethernet cable connected directly between the Hub and a gigabit network card with no other devices connected at the main entry point of the property to exclude internal wiring problems and wifi or congestion issues. I dont have any problems personally with the service for browsing and watching videos however the gamers in the household are complaining bitterly of lag and slow speeds.

The Hub status logs suggests a problem on Channels 4 and 5 with reduced SNR and high error counts. The log also gives very frequent error messages which are copied below. 

An engineer has been round once and he mentioned that 2 channels were "red" and the others were "green" and there were no problems at the property and that he raised an issue with broadband support who would investigate further. The following day the online service status did show a problem in the area and that an engineer was on his way and that problem is now resolved but my issues remains the same.

I have copied and pasted sections of the network status pages highlighting the issues.

Downstream bonded channels
Channel Frequency (Hz) Power  SNR  Modulation Channel ID
1             331000000         2.4       40          256 qam 25
2             203000000         2.5       40          256 qam 9
3             211000000         2.7       40          256 qam 10
4             219000000         2.5       31          256 qam 11
5             227000000         2          33          256 qam 12
6             235000000         2.5       40          256 qam 13
7             243000000         1.4       40          256 qam 14
8             251000000         2          40          256 qam 15

 

Downstream bonded channels
Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1                  Locked            40.3                 404             14
2                  Locked            40.3                 231             1
3                  Locked            40.3                 106             13
4                  Locked            31.2                 5440405     3710390
5                  Locked            33.5                 1579768     335122
6                  Locked            40.3                  96              13
7                  Locked            40.3                  91               0
8                  Locked            40.9                  94               0

Network Log
Time Priority Description
02/06/2020 19:09:6 Warning! RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
02/06/2020 19:09:5 Warning! Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
02/06/2020 19:05:57 Warning! RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
02/06/2020 19:05:56 Warning! Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
02/06/2020 19:04:2 Warning! RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
02/06/2020 19:04:1 Warning! Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
02/06/2020 19:01:38 Warning! RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

I would very grateful for your assistance.

M Javid

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Eeeps
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Re: Variable speeds with low SNR and high errors

Hopefully you can get the noise problems resolved quickly. It would be worth posting your upstream levels too.

Are you using a SH2 on a 350Mb/s package? Since this only bonds 8 downstream channels the maximum rate is only 400Mb/s
You should really be using a SH3.

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javidm
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Re: Variable speeds with low SNR and high errors

Apologies, I am on SH3 I just had not scrolled down the tables far enough. My upload speeds tend to be quite good at around 30 Mbps which is sometimes higher than my download speeds. Full tables posted below:

Thanks again for your help

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1             331000000                      2.4        40            256 qam 25
2             203000000                      2.5        40            256 qam 9
3             211000000                      2.7        40            256 qam 10
4             219000000                      2.5        31            256 qam 11
5             227000000                      2.2        33            256 qam 12
6             235000000                      2.7        40            256 qam 13
7             243000000                      1.5        40            256 qam 14
8             251000000                      2           40            256 qam 15
9             259000000                      1.4        38            256 qam 16
10           267000000                      1.5        38            256 qam 17
11           275000000                      1.9        40            256 qam 18
12           283000000                       2          40            256 qam 19
13           291000000                       2.2       40            256 qam 20
14           299000000                       3          40            256 qam 21
15           307000000                       2.5       40            256 qam 22
16           315000000                       3          40            256 qam 23
17           323000000                       3.2       40            256 qam 24
18           339000000                       3.2       40            256 qam 26
19           347000000                       2.7       40            256 qam 27
20           355000000                       2.7       40            256 qam 28
21           363000000                       3.2       40            256 qam 29
22           371000000                       2.9       40            256 qam 30
23           379000000                       2.9       40            256 qam 31
24           387000000                       3          40            256 qam 32


Downstream bonded channels
Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1 Locked                                    40.3                2462 110
2 Locked                                    40.3              34846 320
3 Locked                                    40.3              21962 233
4 Locked                                    31.1        99424847 70566739
5 Locked                                    33.9          5005101 803120
6 Locked                                    40.3              54755 846
7 Locked                                    40.3              18058 175
8 Locked                                    40.3              13665 161
9 Locked                                    38.9              10716 260
10 Locked                                  38.9              10960 225
11 Locked                                  40.3                8610 191
12 Locked                                  40.9                6864 162
13 Locked                                  40.3                4518 164
14 Locked                                  40.3                2486 145
15 Locked                                  40.3                 2279 99
16 Locked                                  40.3                 2128 167
17 Locked                                  40.3                 2018 107
18 Locked                                  40.3                 1388 134
19 Locked                                  40.9                  2110 85
20 Locked                                  40.3                 1748 118
21 Locked                                  40.9                 1215 185
22 Locked                                  40.3                 2370 73
23 Locked                                  40.3                 1120 2158
24 Locked                                  40.9                   449 76

 

Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 46200014                                4.85                       5120              64 qam 1
2 25800000                                4.625                     5120              64 qam 4
3 32600000                                4.65                       5120              64 qam 3
4 39400024                                4.725                     5120              64 qam 2


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

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javidm
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Re: Variable speeds with low SNR and high errors

Apologies, I am on SH3 but I had not scrolled all the way down when copying the tables. I have copied and pasted the full tables below. The SNR seems to have dropped further and channel 4 is no longer locked. My upload speeds are quite satisfactory and sometimes even higher than my downloads speeds ! The upload table does not seem to be showing any problems.

Thanks again for your help

Channel

Frequency (Hz)

Power (dBmV)

SNR (dB)

Modulation

Channel ID

1

331000000

1.7

40

256 qam

25

2

203000000

1.7

40

256 qam

9

3

211000000

1.9

38

256 qam

10

4

219000000

1.5

24

256 qam

11

5

227000000

1.5

32

256 qam

12

6

235000000

1.7

40

256 qam

13

7

243000000

0.5

38

256 qam

14

8

251000000

1

38

256 qam

15

9

259000000

0.4

38

256 qam

16

10

267000000

0.7

38

256 qam

17

11

275000000

0.9

40

256 qam

18

12

283000000

1

40

256 qam

19

13

291000000

1.2

40

256 qam

20

14

299000000

2

40

256 qam

21

15

307000000

1.5

40

256 qam

22

16

315000000

2.2

40

256 qam

23

17

323000000

2.2

40

256 qam

24

18

339000000

2.4

40

256 qam

26

19

347000000

1.7

40

256 qam

27

20

355000000

2

38

256 qam

28

21

363000000

2.4

40

256 qam

29

22

371000000

2

40

256 qam

30

23

379000000

2

40

256 qam

31

24

387000000

2

40

256 qam

32

 

Channel

Locked Status

RxMER (dB)

Pre RS Errors

Post RS Errors

1

Locked

40.3

2462

110

2

Locked

40.3

34846

320

3

Locked

40.3

21962

233

4

NotLocked

31.1

99424847

70566739

5

Locked

33.9

5005101

803120

6

Locked

40.3

54755

846

7

Locked

40.3

18058

175

8

Locked

40.3

13665

161

9

Locked

38.9

10716

260

10

Locked

38.9

10960

225

11

Locked

40.3

8610

191

12

Locked

40.9

6864

162

13

Locked

40.3

4518

164

14

Locked

40.3

2486

145

15

Locked

40.3

2279

99

16

Locked

40.3

2128

167

17

Locked

40.3

2018

107

18

Locked

40.3

1388

134

19

Locked

40.9

2110

85

20

Locked

40.3

1748

118

21

Locked

40.9

1215

185

22

Locked

40.3

2370

73

23

Locked

40.3

1120

2158

24

Locked

40.9

449

76

 

Channel

Frequency (Hz)

Power (dBmV)

Symbol Rate (ksps)

Modulation

Channel ID

1

46200014

4.85

5120

64 qam

1

2

25800000

4.625

5120

64 qam

4

3

32600000

4.65

5120

64 qam

3

4

39400024

4.725

5120

64 qam

2

 

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

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Emily_G
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Re: Variable speeds with low SNR and high errors

Thank you for the post Javidm.

 

I'll pop you over a private message so we can look into the account to see what's going on for you.

 

Please respond to this by going to the purple envelope in the top right of your screen.

 

Thank you, Emily.

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