107s19's profile

Regular Visitor

 • 

4 Messages

Wed, Nov 4, 2020 10:00 PM

Constant ping jitter, occasional spurts of packet loss

Hi,

 

I've done extensive testing of the ping jitter, and isolated it beyond my equipment. I am getting anywhere from 1-30ms round trip ping from my access point or router, but when I track my ping beyond my router, it has consistent spikes of ping up into the 130ms range. 

 

This makes games unplayable.

 

On top of that, I have occasional disconnects where the connection lags like crazy for a minute every hour or so (sometimes more often, sometimes less). This only happens on upstream, as I can see that the UDP packets are reaching my computer, yet the packets leaving my computer are being dropped (no control over what's happening in game).

 

I have swapped my XB-6A modem with the Intel Puma chipset out for the XB-7T with the Broadcom chipset, and it hasn't fixed anything.


Then, I have tracked my upload power, and it seems to spike whenever the hourly disconnect strikes. 

 

Outside of that, I have also swapped the splitter with a high quality Antronix unit, and then terminated all unterminated coax with 75 ohm terminators.

Responses

EG

Expert

 • 

87.1K Messages

7 m ago

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


107s19

Regular Visitor

 • 

4 Messages

7 m ago

 

Downstream
Channel Bonding Value
36
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
37
38
48
 
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
621 MHz
447 MHz
453 MHz
459 MHz
465 MHz
471 MHz
477 MHz
483 MHz
489 MHz
495 MHz
507 MHz
513 MHz
519 MHz
525 MHz
531 MHz
537 MHz
543 MHz
549 MHz
555 MHz
561 MHz
567 MHz
573 MHz
579 MHz
585 MHz
591 MHz
597 MHz
603 MHz
609 MHz
615 MHz
627 MHz
633 MHz
850 MHz
713600000
42.3 dB
42.1 dB
42.2 dB
42.3 dB
42.1 dB
42.2 dB
42.1 dB
42.0 dB
42.1 dB
41.9 dB
42.1 dB
42.1 dB
42.0 dB
42.1 dB
41.9 dB
41.9 dB
41.9 dB
42.0 dB
42.1 dB
42.0 dB
42.0 dB
42.0 dB
42.2 dB
42.1 dB
42.1 dB
42.2 dB
42.2 dB
42.1 dB
42.3 dB
42.4 dB
42.4 dB
41.9 dB
NA
10.4 dBmV
9.2 dBmV
9.4 dBmV
9.6 dBmV
9.7 dBmV
9.6 dBmV
9.6 dBmV
9.6 dBmV
9.7 dBmV
9.5 dBmV
9.6 dBmV
9.8 dBmV
9.6 dBmV
9.6 dBmV
9.4 dBmV
9.7 dBmV
9.4 dBmV
9.7 dBmV
9.7 dBmV
9.7 dBmV
9.7 dBmV
9.7 dBmV
9.9 dBmV
10.1 dBmV
10.2 dBmV
10.2 dBmV
10.4 dBmV
9.9 dBmV
10.5 dBmV
10.8 dBmV
10.5 dBmV
11.2 dBmV
NA
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
256 QAM
OFDM
OFDM

 

1
2
3
4
5
Locked
Locked
Locked
Locked
Locked
17 MHz
23 MHz
30 MHz
36 MHz
41 MHz
5120
5120
5120
5120
1280
42.8 dBmV
42.8 dBmV
42.5 dBmV
42.0 dBmV
39.0 dBmV
QAM
QAM
QAM
QAM
QAM
ATDMA
ATDMA
ATDMA
ATDMA
ATDMA

 

Upload does peak occasionally, I will post it once it peaks.

EG

Expert

 • 

87.1K Messages

7 m ago

The downstream is on the high side, The SNR's and the upstream were ok at that snapshot in time.

 


@107s19 wrote:

 

Upload does peak occasionally, I will post it once it peaks.


Please do.

107s19

Regular Visitor

 • 

4 Messages

6 m ago

 https://i.postimg.cc/MGzVFptX/Untitled.png

 

 

Here's an image with the upload transmit power too high... Also you can see the uncorrectable codewords that are occuring occasionally.

Official Employee

 • 

2.5K Messages

6 m ago

Hi, 107s19. We can look into things a bit further on our end. Please send me a PM with your first and last name, we can go from there. 

 

To send a private message, please click my name "ComcastMorgan" then select "Send a Message" on the right side.  

EG

Expert

 • 

87.1K Messages

6 m ago

Yep. Something intermittent is going on with your connection. Perhaps there is intermittent noise ingress into the line(s) somewhere.

 

There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.

 

I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They will be able to poll the CMTS to see whether or not everything is in the green zone, see your node / cable plant and modem health, and also see a history plot for the modem. You should get a reply here in your topic. Good luck !

Proxa07

Regular Visitor

 • 

4 Messages

6 m ago

I’m having these same issues as well if you could help me look into it. It’s been like this for weeks
Proxa07

Regular Visitor

 • 

4 Messages

6 m ago

This exact thing keeps happening to me right now. Not sure if it was resolved for you but I’ve been struggling with it for weeks
ComcastChe

Official Employee

 • 

6.1K Messages

6 m ago

Thanks for taking the time to chat with us in a private message so we could help get a  tech out who helped fix your issue, @107s19. If you need anything in the future, please create a new post with details of your issue, and we'd be happy to assist! Thanks for being a loyal member of the Comcast family. Take care! 🙂 

 

@Proxa07, If you haven't already, please open your own public post with details of your experience, and a member of our team will be with you as soon as possible!  

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