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Stream levels? Getting regular T3 time-outs and Dynamic Range Window violations

Regular Visitor

Stream levels? Getting regular T3 time-outs and Dynamic Range Window violations

I've been getting small outages each day for a while now.  Since this started I switched from the xFinity modem to a Motorola.  I've been digging into the logs and seeing regular alerts...

#Dynamic Range Window violation

#Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=00:40:36:4d:df:ca;CMTS-MAC=58:97:bd:2e:45:5d;CM-QOS=1.1;CM-VER=3.0; 

#Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=00:40:36:4d:df:ca;CMTS-MAC=58:97:bd:2e:45:5d;CM-QOS=1.1;CM-VER=3.0; 

Also I've been seeing regular port scans from 75.75.75.75:53 (Comcast)

 

Also here are the Down/Upstream rates...

 

Downstream Bonded Channels  
  
   Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (d Corrected Uncorrected
1 Locked QAM256 17 615.0 8.2 41.4 2193 4039
2 Locked QAM256 13 591.0 9.1 42.1 2181 5636
3 Locked QAM256 14 597.0 9.1 42.1 1679 3816
4 Locked QAM256 15 603.0 8.5 41.7 1727 2940
5 Locked QAM256 16 609.0 8.1 41.5 1992 2870
6 Locked QAM256 18 621.0 8.9 41.5 2778 5792
7 Locked QAM256 19 627.0 9.0 41.6 2139 4986
8 Locked QAM256 20 633.0 8.5 41.4 1246 2822
9 Locked QAM256 21 639.0 7.9 41.0 1428 2273
10 Locked QAM256 22 645.0 8.5 41.2 1632 2762
11 Locked QAM256 23 651.0 9.0 41.3 1723 3182
12 Locked QAM256 24 657.0 8.8 41.1 2308 4406
13 Locked QAM256 25 663.0 8.3 40.8 1741 4255
14 Locked QAM256 26 669.0 7.7 40.5 1099 2402
15 Locked QAM256 27 675.0 8.5 40.1 1372 1505
16 Locked QAM256 28 681.0 9.1 40.9 1353 2651
Total             28591 56337
Upstream Bonded Channels  
  
   Channel Lock Status Channel Type Channel ID Symb. Rate (Ksym/sec) Freq. (MHz) Pwr (dBmV)
1 Locked ATDMA 1 5120 36.5 43.8
2 Locked ATDMA 2 5120 30.1 44.5
3 Locked ATDMA 3 5120 23.7 44.4
4 Locked ATDMA 4 2560 17.3 43.7

 

Any ideas?

Thanks

Expert

Re: Stream levels? Getting regular T3 time-outs and Dynamic Range Window violations

Is the modem resetting when you lose connection? You would see the lights cycle and the events would also be noted in the logs. How many T3, T4 errors are you seeing in a day? Is there a router involved? If you eliminate the router do you still have issues? See the troubleshooting guide, it might help.


I am not a Comcast employee, just a moderator. Pls observe Wheaton's Law.
Regular Visitor

Re: Stream levels? Getting regular T3 time-outs and Dynamic Range Window violations

Thanks Nerdbug,

I'm getting between 5-13 T3 T4 errors a day, the logs do go back more than a few days.  The modem has been up for 2 weeks, so it isn't going up and down.  There is no wireless router, the modem is an all-in-one.  There's no splitter involved.  The problem existed with the previous xFinity modem as well.  I did try a reboot.  I called xFinity, they tried tests and couldn't see anything fromt heir end. The tech told me to document the up and down 10 times, and then give a call back.

Expert

Re: Stream levels? Getting regular T3 time-outs and Dynamic Range Window violations

Alright, let's get an employee to take a look, they can see some values that we can't see from the modem. My guess is that you'll need a tech to get this resolved. If so, the employee can help you get that set up. 

 

I've asked a Comcast employee to help you. You should expect a reply in this thread. 

 

Tip: If you need service, sign up for the Service Protection Plan (SPP). It's around $6 a month and you must keep it for at least 60 days after your service call. If you have SPP, you won't incur a service charge. You can sign up when you schedule an appointment.

 

 


I am not a Comcast employee, just a moderator. Pls observe Wheaton's Law.
Diamond Problem Solver

Re: Stream levels? Getting regular T3 time-outs and Dynamic Range Window violations

FWIW, not sure if it is the root cause of your problem but your downstream power is a bit on the high side.

Regular Visitor

Re: Stream levels? Getting regular T3 time-outs and Dynamic Range Window violations

Thanks Nerdbug!

Official Employee

Re: Stream levels? Getting regular T3 time-outs and Dynamic Range Window violations

 

Hello Dayvid, it sounds like we may need to get a tech out to look into your services. But first, I'd like to check into your signals on my end so we can determine if a line tech is needed or if it can be resolved by an in house tech. Please send me a private message with your full name, street address, and account number by clicking on my name (ComcastAmir) and then "private message me". 

Official Employee

Re: Stream levels? Getting regular T3 time-outs and Dynamic Range Window violations

You're welcome, and thank you for providing your account information. I show that your signals looks great coming from the plant, but the signal at your pole outside is showing poor upstream power. I can send a signal to your modem to correct the issue but a tech may be required to repair this issue. Is now a good time to send a signal to your modem? 

Regular Visitor

Re: Stream levels? Getting regular T3 time-outs and Dynamic Range Window violations

Please go ahead and test at any time.

Official Employee

Re: Stream levels? Getting regular T3 time-outs and Dynamic Range Window violations

 

Dayvid wrote: Thanks for checking, it's been OK.  It sometimes seems to have small bouts of slowness, but not much. 

 

I am glad that we were able to get this taken care of for you, have a good day.