Observer

Signal Diagnosis

About 5 days ago, I recently swapped our modem and received the DOCSIS 3.1 Ubee E31U2V1 (we have telephone service)  since it looked out or old modem (Arris TG1672G) was on its last legs and had to be restarted frequently or it was losing connection more often. Additonally, we are using a google wifi with 3  of those pucks as a mesh network (using MOCA for ethernet backhaul).

Anyways,  our connection has been fine now for the past few days, but with some choppiness on skype/discord calls at times, although that could be due to some other issues. 

While it is a pain to get access to, I took a look at the modem's signal page, Everything seems to be fine and dandy except for the upstream which is a little high according to the reference here in the forums. But this might also be due to the fact that we live in a hilly environment, where even our cell service can be horrid. Though even another reason that our internet should be consistent as possible.

Anways, I just want to know what your thoughts are of our signals, and if we should call a Spectrum Tech about the upstream or any other signs of concerns.
Thanks.

9 REPLIES 9
Observer

Re: Signal Diagnosis

CM Downstream Channel Info

Channel

Lock Status

Channel Type

Channel ID

Frequency

Width

Power

SNR

Modulation Profile ID

Correctables

Uncorrectables

1

Locked

SC-QAM Downstream

31

705000000 Hz

6000000 Hz

1.3 dBmV

43.5 dB

QAM256

0

0

2

Locked

SC-QAM Downstream

1

693000000 Hz

6000000 Hz

1.2 dBmV

43.3 dB

QAM256

0

0

3

Locked

SC-QAM Downstream

2

525000000 Hz

6000000 Hz

1.1 dBmV

43.7 dB

QAM256

0

0

4

Locked

SC-QAM Downstream

3

531000000 Hz

6000000 Hz

1.1 dBmV

43.5 dB

QAM256

0

0

5

Locked

SC-QAM Downstream

4

537000000 Hz

6000000 Hz

1.3 dBmV

43.7 dB

QAM256

0

0

6

Locked

SC-QAM Downstream

5

543000000 Hz

6000000 Hz

1.1 dBmV

43.7 dB

QAM256

0

0

7

Locked

SC-QAM Downstream

6

549000000 Hz

6000000 Hz

1.1 dBmV

43.6 dB

QAM256

0

0

8

Locked

SC-QAM Downstream

7

555000000 Hz

6000000 Hz

1.2 dBmV

43.7 dB

QAM256

0

0

9

Locked

SC-QAM Downstream

8

561000000 Hz

6000000 Hz

1.1 dBmV

43.7 dB

QAM256

0

0

10

Locked

SC-QAM Downstream

9

567000000 Hz

6000000 Hz

1.3 dBmV

43.8 dB

QAM256

0

0

11

Locked

SC-QAM Downstream

10

573000000 Hz

6000000 Hz

1.2 dBmV

43.6 dB

QAM256

0

0

12

Locked

SC-QAM Downstream

11

579000000 Hz

6000000 Hz

1.3 dBmV

43.8 dB

QAM256

0

0

13

Locked

SC-QAM Downstream

12

585000000 Hz

6000000 Hz

1.1 dBmV

43.6 dB

QAM256

0

0

14

Locked

SC-QAM Downstream

13

591000000 Hz

6000000 Hz

1.3 dBmV

43.5 dB

QAM256

0

0

15

Locked

SC-QAM Downstream

14

597000000 Hz

6000000 Hz

1.6 dBmV

43.7 dB

QAM256

0

0

16

Locked

SC-QAM Downstream

15

603000000 Hz

6000000 Hz

1.5 dBmV

43.7 dB

QAM256

0

0

17

Locked

SC-QAM Downstream

16

609000000 Hz

6000000 Hz

1.4 dBmV

43.6 dB

QAM256

0

0

18

Locked

SC-QAM Downstream

17

615000000 Hz

6000000 Hz

1.5 dBmV

43.7 dB

QAM256

0

0

19

Locked

SC-QAM Downstream

18

621000000 Hz

6000000 Hz

1.5 dBmV

43.6 dB

QAM256

0

0

20

Locked

SC-QAM Downstream

19

627000000 Hz

6000000 Hz

1.8 dBmV

43.5 dB

QAM256

0

0

21

Locked

SC-QAM Downstream

20

633000000 Hz

6000000 Hz

1.8 dBmV

43.8 dB

QAM256

0

0

22

Locked

SC-QAM Downstream

21

639000000 Hz

6000000 Hz

1.8 dBmV

43.8 dB

QAM256

0

0

23

Locked

SC-QAM Downstream

22

645000000 Hz

6000000 Hz

1.9 dBmV

43.3 dB

QAM256

0

0

24

Locked

SC-QAM Downstream

23

651000000 Hz

6000000 Hz

2.2 dBmV

43.9 dB

QAM256

0

0

25

Locked

SC-QAM Downstream

24

657000000 Hz

6000000 Hz

1.9 dBmV

43.9 dB

QAM256

0

0

26

Locked

SC-QAM Downstream

25

663000000 Hz

6000000 Hz

1.6 dBmV

43.3 dB

QAM256

0

0

27

Locked

SC-QAM Downstream

26

669000000 Hz

6000000 Hz

1.5 dBmV

43.3 dB

QAM256

0

0

28

Locked

SC-QAM Downstream

27

675000000 Hz

6000000 Hz

1.3 dBmV

42.3 dB

QAM256

0

0

29

Locked

SC-QAM Downstream

28

681000000 Hz

6000000 Hz

1.3 dBmV

43.3 dB

QAM256

0

0

30

Locked

SC-QAM Downstream

29

687000000 Hz

6000000 Hz

1.3 dBmV

43.3 dB

QAM256

0

0

31

Locked

SC-QAM Downstream

30

699000000 Hz

6000000 Hz

1 dBmV

43.3 dB

QAM256

0

0

32

Locked

OFDM Downstream

33

380000000 Hz

94000 kHz

2.8 dBmV

43.0 dB

0 1 2

0

0

 

 

 

Channel

Lock Status

Channel Type

Channel ID

Frequency

Width

Power

Modulation/Profile ID

   

1

Locked

ATDMA

57

17600000 Hz

6400000 Hz

50.5 dBmV

2

   

2

Locked

ATDMA

58

24000000 Hz

6400000 Hz

51 dBmV

2

   

3

Locked

ATDMA

59

30400000 Hz

6400000 Hz

51.8 dBmV

2

   

4

Locked

ATDMA

60

36800000 Hz

6400000 Hz

52.3 dBmV

2

   

 

Contributor

Re: Signal Diagnosis

Your downstream  Power levels range from  1 dBMv to 2.8 dBMv.... This looks good.

Your downstream SNR range from 43.0 to 43.9.....which is excellent

your Upstream Power levels are borderline high.

 

https://forums.timewarnercable.com/t5/Connectivity/FYI-basics-of-signal-power-level/m-p/116692#M3763...

Helper

Re: Signal Diagnosis

Yeah those upstream levels are right on the edge. Any slight change in temperature, wind, or just regular interference can push those too high a cause a problem.

 

Do you have multiple splitters or any unused legs off a splitter that can be eliminated?

Sharer

Re: Signal Diagnosis

Modem is essentially screaming to be heard... and about to give up and reboot. Noise may be creeping into the return path. Could be a failing power supply/amp/splitter/etc. that a tech will need to rule out.

Otherwise, look for things like compromised shielding, loose/corroded connections, sections of cable that may be regularly exposed to water, high heat, etc.. Also want to avoid sharp bends... ideally no sharper than about what it takes to wrap around a 2-liter soda bottle.

If you can see where the wire comes in and connects to the in-house cabling, that splitter/coupling point should have grounding wire that runs directly to the nearest grounding post from the electric company (nothing fancy... may just be a simple metal stake in the ground that wires are bolted to). Make sure that wire has a clean and tight connection at both ends.

As @reds91185 was pointing out, don't want any open cables in the house. Each connected cable should should have a device connected or have a termination cap on it. No more splits in play than necessary to serve the devices in use... but don't just disconnect a cable from a splitter, as that can be just as bad (if not worse) then leaving an open cable connected. Ideally you would want to switch to a smaller splitter (x4 to x2). If you can't switch to a smalller splitter, then the unneeded port should have at least a few feet of cable with a termination cap on it to reduce the risk of weird signal reflection feeding back.
Proven Sharer

Re: Signal Diagnosis

You definitely have a line loss issue with the upstream side of your connection.  And if you don't seriously need Gigabit internet, I would tell Spectrum to reset it down to 300 Mbps and reduce your monthly billing total.  Asking for a higher speed doesn't fix any existing line issues. 

Observer

Re: Signal Diagnosis

So I noticed the splitter (3 way) connecting to my modem was the 7.0 db, and switched that coax to the 3.5.
All the other coax that were connected to the splitter was switched vice versa. The modem should usually always be on the port that recieves the least amount of signal loss, so it was a bit weird that the technician did this. 

It did turn my upstream levels from good to 'average or decent/',  but the downstream levels  is more managable. I'll keep monitoring my modem signals for the next couple weeks, but this should be fine and dandy for now.

Observer

Re: Signal Diagnosis

 

CM Downstream Channel Info

Channel

Lock Status

Channel Type

Channel ID

Frequency

Width

Power

SNR

Modulation Profile ID

Correctables

Uncorrectables

1

Locked

SC-QAM Downstream

30

699000000 Hz

6000000 Hz

4.5 dBmV

43.1 dB

QAM256

0

0

2

Locked

SC-QAM Downstream

1

693000000 Hz

6000000 Hz

4.8 dBmV

43.2 dB

QAM256

0

0

3

Locked

SC-QAM Downstream

2

525000000 Hz

6000000 Hz

4.7 dBmV

43.5 dB

QAM256

0

0

4

Locked

SC-QAM Downstream

3

531000000 Hz

6000000 Hz

4.8 dBmV

43.5 dB

QAM256

0

0

5

Locked

SC-QAM Downstream

4

537000000 Hz

6000000 Hz

4.8 dBmV

43.6 dB

QAM256

0

0

6

Locked

SC-QAM Downstream

5

543000000 Hz

6000000 Hz

4.6 dBmV

43.5 dB

QAM256

0

0

7

Locked

SC-QAM Downstream

6

549000000 Hz

6000000 Hz

4.6 dBmV

43.4 dB

QAM256

0

0

8

Locked

SC-QAM Downstream

7

555000000 Hz

6000000 Hz

4.7 dBmV

43.2 dB

QAM256

0

0

9

Locked

SC-QAM Downstream

8

561000000 Hz

6000000 Hz

4.6 dBmV

43.5 dB

QAM256

0

0

10

Locked

SC-QAM Downstream

9

567000000 Hz

6000000 Hz

4.9 dBmV

43.3 dB

QAM256

0

0

11

Locked

SC-QAM Downstream

10

573000000 Hz

6000000 Hz

4.9 dBmV

43.6 dB

QAM256

0

0

12

Locked

SC-QAM Downstream

11

579000000 Hz

6000000 Hz

4.7 dBmV

43.4 dB

QAM256

0

0

13

Locked

SC-QAM Downstream

12

585000000 Hz

6000000 Hz

4.7 dBmV

43.4 dB

QAM256

0

0

14

Locked

SC-QAM Downstream

13

591000000 Hz

6000000 Hz

5.1 dBmV

43.4 dB

QAM256

0

0

15

Locked

SC-QAM Downstream

14

597000000 Hz

6000000 Hz

5.1 dBmV

43.5 dB

QAM256

0

0

16

Locked

SC-QAM Downstream

15

603000000 Hz

6000000 Hz

5 dBmV

43.5 dB

QAM256

0

0

17

Locked

SC-QAM Downstream

16

609000000 Hz

6000000 Hz

5 dBmV

43.1 dB

QAM256

0

0

18

Locked

SC-QAM Downstream

17

615000000 Hz

6000000 Hz

5 dBmV

43.5 dB

QAM256

0

0

19

Locked

SC-QAM Downstream

18

621000000 Hz

6000000 Hz

5.1 dBmV

43.1 dB

QAM256

0

0

20

Locked

SC-QAM Downstream

19

627000000 Hz

6000000 Hz

5.5 dBmV

43.5 dB

QAM256

0

0

21

Locked

SC-QAM Downstream

20

633000000 Hz

6000000 Hz

5.5 dBmV

43.6 dB

QAM256

0

0

22

Locked

SC-QAM Downstream

21

639000000 Hz

6000000 Hz

5.1 dBmV

43.5 dB

QAM256

0

0

23

Locked

SC-QAM Downstream

22

645000000 Hz

6000000 Hz

5.5 dBmV

43.7 dB

QAM256

0

0

24

Locked

SC-QAM Downstream

23

651000000 Hz

6000000 Hz

5.8 dBmV

43.8 dB

QAM256

0

0

25

Locked

SC-QAM Downstream

24

657000000 Hz

6000000 Hz

5.3 dBmV

43.4 dB

QAM256

0

0

26

Locked

SC-QAM Downstream

25

663000000 Hz

6000000 Hz

5.3 dBmV

43.1 dB

QAM256

0

0

27

Locked

SC-QAM Downstream

26

669000000 Hz

6000000 Hz

5.2 dBmV

43.2 dB

QAM256

0

0

28

Locked

SC-QAM Downstream

27

675000000 Hz

6000000 Hz

4.9 dBmV

42.6 dB

QAM256

0

0

29

Locked

SC-QAM Downstream

28

681000000 Hz

6000000 Hz

4.9 dBmV

43.1 dB

QAM256

0

0

30

Locked

SC-QAM Downstream

29

687000000 Hz

6000000 Hz

4.9 dBmV

43.1 dB

QAM256

0

0

31

Locked

SC-QAM Downstream

31

705000000 Hz

6000000 Hz

5.1 dBmV

43.4 dB

QAM256

0

0

32

Locked

OFDM Downstream

33

380000000 Hz

94000 kHz

6.2 dBmV

43.0 dB

0 1 2

0

0

Observer

Re: Signal Diagnosis

CM Upstream Channel Info

Channel

Lock Status

Channel Type

Channel ID

Frequency

Width

Power

Modulation/Profile ID

   

1

Locked

ATDMA

57

17600000 Hz

6400000 Hz

47 dBmV

2

   

2

Locked

ATDMA

58

24000000 Hz

6400000 Hz

47.8 dBmV

2

   

3

Locked

ATDMA

59

30400000 Hz

6400000 Hz

48.8 dBmV

2

   

4

Locked

ATDMA

60

36800000 Hz

6400000 Hz

49 dBmV

2

   

 

Highlighted
Helper

Re: Signal Diagnosis

Those upstream power levels definitely look better now. Weird that the tech put the modem on the highest loss leg of the splitter...he should have known better.

 

My own upstream levels are usually in this range of 47-49.5 and I don't have any problems...I'm using the same modem.