stakka's profile

Regular Visitor

 • 

3 Messages

Sun, Jan 10, 2021 8:00 AM

NetGear CM1000v2 FW: V7.01.01 - Regular (and I mean regular) Internet Issues

I am not sure when these issues started happen, I am sure it was not immediately when I connected the CM1000v2, possibly after a firmware update but I cannot confirm that.

What happens? My internet dies, I wake in the morning and notice a non-responsive internet experience and do a "SpeedTest" and notice an almost dial-up download speed of less than 1MBps. To remedy this I turn off my modem, unplug the cable, wait 10s, plug the cable back in and turn the modem on. This worked all the time until today (01/10/2010) when the first manual reset did not work and I had to perform another. Regardless, the modem and the router are both reset at 2am every night and this should be enough to "blow the gremlins out of the system".

I have phoned Xfinity customer service often, I have had engineers come out. They larrive when the interne tis responsive and they leave when it is still responsive. There needs to be a permanent solution; NetGear tells me this modem works on the Xfinity cable network and you guys do not tell me otherwise.

To add to this in a hope someone can shed some light on this matter, the modem logs (which are not great, in that they overwrite entries) tells me there is a lot of this
`SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing`
and a lot of this
`No Ranging Response received`.



Responses

EG

Expert

 • 

87.2K Messages

5 m ago

What do the modem's signal stats look like ? Try getting them here http://192.168.100.1 or here http://10.0.0.1

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.


Regular Visitor

 • 

3 Messages

5 m ago

So, this morning (01/16/2021) I tried a manual reset - FAIL. I then proceeded to perform a reset from the modem admin console - FAIL. And by 'FAIL' I mean the state of my download speed remained unchanged (<1Mbps) after the 'reset'. I then performed an Xfinity modem reset from my Xfinity account console - FAIL. I called Xfinity and they (lovely Xfinity robot lady who is quite familiar of my voice by now) performed a remote reset (same as the previous 'reset', I guess but ANYTHING to move on from dial-up) - FAIL. Then I did another manual reset (turn off modem, unplug cable, wait a holy 15s, plug cable back in and turn modem on) - SUCCESS. There is no common denominator here so I have no clue as to what is going on - CLUELESS.

I have pulled the stats from the modem when it refuses to give me a decent download speed, this table represents the "Download Bonded Channels":

 

Channel

Lock Status

Modulation

Channel ID

Frequency

Power

SNR / MER

Unerrored Codewords

Correctable Codewords

Uncorrectable Codewords

1

Locked

QAM256

28

603000000 Hz

4.3 dBmV

37.6 dB

1118847452

5030

0

2

Locked

QAM256

4

453000000 Hz

7.5 dBmV

39.4 dB

1117662671

19

0

3

Locked

QAM256

5

459000000 Hz

7.5 dBmV

39.6 dB

1117666526

18

0

4

Locked

QAM256

6

465000000 Hz

7.6 dBmV

39.5 dB

1117670015

20

0

5

Locked

QAM256

7

471000000 Hz

7.5 dBmV

39.5 dB

1117674006

33

0

6

Locked

QAM256

8

477000000 Hz

7.4 dBmV

39.4 dB

1117679469

35

0

7

Locked

QAM256

9

483000000 Hz

7.2 dBmV

39.2 dB

1117684961

70

0

8

Locked

QAM256

10

489000000 Hz

7.2 dBmV

39.3 dB

1117692023

59

0

9

Locked

QAM256

11

495000000 Hz

7.0 dBmV

39.3 dB

1117698005

78

0

10

Locked

QAM256

12

507000000 Hz

6.9 dBmV

39.1 dB

1117701534

127

0

11

Locked

QAM256

13

513000000 Hz

6.5 dBmV

38.9 dB

1117705656

176

0

12

Locked

QAM256

14

519000000 Hz

6.4 dBmV

38.9 dB

1117709292

225

0

13

Locked

QAM256

15

525000000 Hz

6.0 dBmV

38.8 dB

1117713491

309

0

14

Locked

QAM256

16

531000000 Hz

5.7 dBmV

38.6 dB

1117716936

450

0

15

Locked

QAM256

17

537000000 Hz

5.4 dBmV

38.3 dB

1117719951

802

0

16

Locked

QAM256

18

543000000 Hz

5.1 dBmV

38.3 dB

1117723575

963

0

17

Locked

QAM256

19

549000000 Hz

5.2 dBmV

38.3 dB

1117728590

971

0

18

Locked

QAM256

20

555000000 Hz

5.0 dBmV

38.4 dB

1117732022

1003

0

19

Locked

QAM256

21

561000000 Hz

5.0 dBmV

38.4 dB

1117735732

978

0

20

Locked

QAM256

22

567000000 Hz

4.9 dBmV

38.3 dB

1117739437

1146

0

21

Locked

QAM256

23

573000000 Hz

4.8 dBmV

38.1 dB

1117742762

1428

0

22

Locked

QAM256

24

579000000 Hz

4.5 dBmV

38.0 dB

1117746318

1639

0

23

Locked

QAM256

25

585000000 Hz

4.5 dBmV

38.1 dB

1117750031

2499

0

24

Locked

QAM256

26

591000000 Hz

4.5 dBmV

37.9 dB

1117752512

3452

0

25

Locked

QAM256

27

597000000 Hz

4.3 dBmV

37.8 dB

1117754889

4884

0

26

Locked

QAM256

29

609000000 Hz

4.1 dBmV

37.5 dB

1117756335

7267

0

27

Locked

QAM256

30

615000000 Hz

3.9 dBmV

37.3 dB

1117756496

10259

0

28

Locked

QAM256

31

621000000 Hz

3.4 dBmV

37.1 dB

1117756373

14521

0

29

Locked

QAM256

32

627000000 Hz

3.6 dBmV

37.0 dB

1117754034

20844

0

30

Locked

QAM256

33

633000000 Hz

3.5 dBmV

36.9 dB

1117754671

21135

0

31

Locked

QAM256

34

639000000 Hz

2.9 dBmV

36.7 dB

1117747845

27634

0

32

Not Locked

Unknown

0

0 Hz

0.0 dBmV

0.0 dB

0

0

0


The upload speeds seem to remain constant and acceptable (e.g. as advertized) but I will include them here for prosperity:

Channel

Lock Status

Modulation

Channel ID

Frequency

Power

1

Locked

ATDMA

29

36500000 Hz

36.0 dBmV

2

Locked

ATDMA

30

30100000 Hz

35.8 dBmV

3

Locked

ATDMA

31

23700000 Hz

34.8 dBmV

4

Locked

ATDMA

32

17300000 Hz

34.0 dBmV

5

Not Locked

Unknown

0

0 Hz

0.0 dBmV

6

Not Locked

Unknown

0

0 Hz

0.0 dBmV

7

Not Locked

Unknown

0

0 Hz

0.0 dBmV

8

Not Locked

Unknown

0

0 Hz

0.0 dBmV

 

If anyone can decipher these tables and give me a "eureka" moment, I will be extremely grateful!

EG

Expert

 • 

87.2K Messages

5 m ago

Don't know what's going on, but FWIW, the signal status values are o/k.

New to the Community?

Start Here