Welcome to the Spectrum Community

Get answers, share solutions, help your community.

Start here

Signal Diagnosis

mrsteveamrstevea Posts: 7
in Connectivity Aug 16, 2019

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.

Best Answer

  • RAIST5150RAIST5150 Posts: 670 ✭✭✭✭
    Aug 16, 2019 Accepted Answer
    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.

Replies

  • mrsteveamrstevea Posts: 7
    Aug 16, 2019

    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

       

     

  • rocketjetzrocketjetz Posts: 130 ✭✭✭✭
    Aug 16, 2019

    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#M37639

  • reds91185reds91185 Posts: 2,452
    Aug 16, 2019

    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?

  • karlbeckmankarlbeckman Posts: 2,208 ✭✭✭✭
    Aug 17, 2019

    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. 

  • mrsteveamrstevea Posts: 7
    Aug 20, 2019

    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.

  • mrsteveamrstevea Posts: 7
    Aug 20, 2019

     

    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

  • mrsteveamrstevea Posts: 7
    Aug 20, 2019

    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

       

     

  • reds91185reds91185 Posts: 2,452
    Aug 20, 2019

    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.

This discussion has been closed.