Contributor

Is downstream power too high?

The connection seems like it could be a bit more stable.  IDK, could be this old Linksys ea3500-n700 I recently pulled out of the closet and switched to.

 

**Edit**

forgot to add image

 

86 REPLIES 86
Spectrum Employee

Re: Is downstream power too high?

Holy smokes! That's raging-high levels for forward / downstream.  +10 dbmv is critically high. Decibles are exponential (the difference between 1 and 2 is tiny, the difference between 10 and 11 would be exponentially more). +18 or more?  Eeek!

If there's amplifier it needs to be removed.  Can you find anything like that in your home?


If you can't find the root cause, call us!  This would definitely be service impacting, and I'd imagine your modem might even be getting a bit roasty-toasty trying to dissipate all that extra electrical energy.

My postings on this site are my own, off-the-clock, and don’t necessarily represent TWC’s/Charter's strategies or opinions.
Contributor

Re: Is downstream power too high?

Well, to be fair, it's normally in the ~15-15.8 range.  It was raining last night and this morning.  Could that have something to do with it?  I was also wondering if 15.5 16 area was too high.

Contributor

Re: Is downstream power too high?

I see your edit now, so 15 is too high after all?

Contributor

Re: Is downstream power too high?

No, there's nothing like that in the home.  They ran a new line specifially for the internet when it was installed and has been that way ever since.

Expert

Re: Is downstream power too high?

TWC has amplifiers and tapoffs grossly missadjusted, I wouldn't settle for an attenuator of any sort since it will push the upstream up to near 50

 

Contributor

Re: Is downstream power too high?

I suppose I'll call and request a truck roll.

Spectrum Employee

Re: Is downstream power too high?


@Labyrinth wrote:

I suppose I'll call and request a truck roll.


Just calling in and asking them to check signal levels and mention your issues your having and we will pretty much volunteer that appointment after a few basic troubleshooting core checks of the wiring.  This is a rather obvious TC ("trouble call" truck roll).

 

If you don't mind, reply back here with what was discovered. (even better with pics/photos!) Smiley Happy

 


@MsRaye wrote:

TWC has amplifiers and tapoffs grossly missadjusted, I wouldn't settle for an attenuator of any sort since it will push the upstream up to near 50


 In your area perhaps. You don't know that for a fact that is what is going on here in this case.

My postings on this site are my own, off-the-clock, and don’t necessarily represent TWC’s/Charter's strategies or opinions.
Contributor

Re: Is downstream power too high?

Well, I am getting over the speed of my plan.  This is all new since Maxx was turned on in my neighboorhood on April 21st.  Zip code 40214,  Louisville, KY.  I upgraded to an SB6183 two weeks ago from an SB6121, both Docsis 3.  Today I did a test plugged directly to the modem.

 

 

The problem I have been seeing is some buffering issues with Netflix or or the download speed of large files jumping all over the place and/or stopping or slowing to a crawl for a second then going back up and jumping around.

Contributor

Re: Is downstream power too high?

Here are signals I copied a few nights ago when Netflix started getting all hiccupy.  

 

Downstream Bonded Channels

Channel

Lock Status

Modulation

Channel ID

Frequency

Power

SNR

Corrected

Uncorrectables

1

Locked

QAM256

1

591000000 Hz

16.9 dBmV

42.4 dB

526

473

2

Locked

QAM256

2

597000000 Hz

17.1 dBmV

42.5 dB

534

586

3

Locked

QAM256

3

603000000 Hz

17.1 dBmV

42.6 dB

704

472

4

Locked

QAM256

4

609000000 Hz

16.7 dBmV

42.4 dB

621

463

5

Locked

QAM256

5

615000000 Hz

16.8 dBmV

42.3 dB

553

659

6

Locked

QAM256

6

621000000 Hz

17.0 dBmV

42.3 dB

571

730

7

Locked

QAM256

7

627000000 Hz

16.8 dBmV

42.0 dB

749

625

8

Locked

QAM256

8

633000000 Hz

16.8 dBmV

41.9 dB

657

521

9

Locked

QAM256

9

639000000 Hz

16.9 dBmV

42.0 dB

873

826

10

Locked

QAM256

10

645000000 Hz

16.9 dBmV

42.3 dB

559

663

11

Locked

QAM256

11

651000000 Hz

16.9 dBmV

42.0 dB

593

563

12

Locked

QAM256

12

657000000 Hz

16.8 dBmV

41.3 dB

770

471

13

Locked

QAM256

13

663000000 Hz

16.5 dBmV

41.6 dB

787

746

14

Locked

QAM256

14

669000000 Hz

16.8 dBmV

41.8 dB

420

591

15

Locked

QAM256

15

675000000 Hz

17.5 dBmV

42.0 dB

612

905

16

Locked

QAM256

16

681000000 Hz

17.5 dBmV

42.1 dB

712

723

 

 

Upstream Bonded Channels

Channel

Lock Status

US Channel Type

Channel ID

Symbol Rate

Frequency

Power

1

Locked

ATDMA

11

5120 Ksym/sec

30600000 Hz

37.0 dBmV

2

Locked

TDMA

9

2560 Ksym/sec

19400000 Hz

35.3 dBmV

3

Locked

ATDMA

10

5120 Ksym/sec

24200000 Hz

36.3 dBmV

4

Locked

ATDMA

12

2560 Ksym/sec

37000000 Hz

37.5 dBmV

 

 

I copied them then reset the modem and it's been running until I took the results for the OP.  

 

That's the first and only time I saw uncorrectables above zero (checking signals at least twice a day) since I upgraded the modem.