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Continual "No Ranging Response received - T3 time-out"

New Poster

Continual "No Ranging Response received - T3 time-out"

Hello --

 

I keep getting "No Ranging Response received - T3 time-out" errors on my Arris SB6190. I've placed a brand new SB6190, as well as an older Motorola SB6141, and all have had the same issue. (Both Arris SB6190's were brand new out of the box). I'm using commercial grade Ubiquiti networking equipment, and have eliminated them as the problem, as the problem happens when DCHP directly to the modem. This issue has been happening consistently since I first moved in to my home (Feb 2018).

 

My downstream signal levels are good. SNR downstream is also good.

 

Upstream has always been an issue. I was observing peaks where the CMTS would crank my modems upstream output level beyond 52 (thus out of spec) and the modem would timeout. 

 

This prompted me to remove all splitters between my modem and the Comcast Tap. The RG-6 cable going to the tap is directly connected to the grounding block from Comcast -- so it's directly connected to the proverbial 'pipe'. The ends are terminated with the best compression fittings in the industry and brand new.

 

Whenever the line comes under load (E.g. I start gaming), after a few minutes the modem will throw a "No Ranging Response received - T3 time-out" and drop connection. Looking at my logs, I always observe one or more of the upstream power-levels spiked higher than normal, telling me the CMTS at the other side of the pipe cranked my levels for some reason (presumably bad SNR in the up-stream connection).

 

Below is my signal readout (down levels are high because I'm directly connected to the 'Pipe' as stated previously.)

 

 

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Corrected	Uncorrectables
1	Locked	256QAM	27	627.00 MHz	4.20 dBmV	40.37 dB	5	45
2	Locked	256QAM	34	441.00 MHz	6.40 dBmV	40.37 dB	0	0
3	Locked	256QAM	35	447.00 MHz	6.10 dBmV	40.37 dB	0	0
4	Locked	256QAM	36	453.00 MHz	6.40 dBmV	40.37 dB	0	0
5	Locked	256QAM	37	459.00 MHz	6.40 dBmV	40.37 dB	0	0
6	Locked	256QAM	1	465.00 MHz	6.30 dBmV	40.37 dB	0	0
7	Locked	256QAM	2	471.00 MHz	6.10 dBmV	40.37 dB	0	0
8	Locked	256QAM	3	477.00 MHz	6.20 dBmV	40.37 dB	0	0
9	Locked	256QAM	4	483.00 MHz	6.50 dBmV	40.37 dB	0	0
10	Locked	256QAM	5	489.00 MHz	6.50 dBmV	40.37 dB	0	0
11	Locked	256QAM	6	495.00 MHz	6.50 dBmV	40.37 dB	0	0
12	Locked	256QAM	7	507.00 MHz	6.30 dBmV	40.37 dB	7	0
13	Locked	256QAM	8	513.00 MHz	5.90 dBmV	40.37 dB	0	0
14	Locked	256QAM	9	519.00 MHz	5.90 dBmV	40.37 dB	16	0
15	Locked	256QAM	10	525.00 MHz	6.00 dBmV	40.37 dB	0	0
16	Locked	256QAM	11	531.00 MHz	5.70 dBmV	38.98 dB	0	0
17	Locked	256QAM	12	537.00 MHz	5.60 dBmV	38.98 dB	0	0
18	Locked	256QAM	13	543.00 MHz	5.60 dBmV	40.37 dB	3	0
19	Locked	256QAM	14	549.00 MHz	5.70 dBmV	38.98 dB	0	0
20	Locked	256QAM	15	555.00 MHz	5.90 dBmV	38.98 dB	0	0
21	Locked	256QAM	16	561.00 MHz	6.30 dBmV	38.98 dB	0	0
22	Locked	256QAM	17	567.00 MHz	6.50 dBmV	40.37 dB	5	0
23	Locked	256QAM	18	573.00 MHz	6.90 dBmV	40.37 dB	11	0
24	Locked	256QAM	19	579.00 MHz	7.10 dBmV	40.95 dB	10	0
25	Locked	256QAM	20	585.00 MHz	7.00 dBmV	39.90 dB	10	0
26	Locked	256QAM	21	591.00 MHz	6.70 dBmV	39.90 dB	0	0
27	Locked	256QAM	22	597.00 MHz	6.10 dBmV	39.90 dB	0	0
28	Locked	256QAM	23	603.00 MHz	5.30 dBmV	39.50 dB	0	0
29	Locked	256QAM	24	609.00 MHz	4.90 dBmV	39.50 dB	0	0
30	Locked	256QAM	25	615.00 MHz	4.60 dBmV	38.90 dB	7	0
31	Locked	256QAM	26	621.00 MHz	4.10 dBmV	39.20 dB	0	0
32	Locked	256QAM	28	633.00 MHz	4.20 dBmV	39.20 dB	0	0

Upstream Bonded Channels
Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	4	5120 kSym/s	16.60 MHz	35.50 dBmV
2	Locked	ATDMA	3	5120 kSym/s	23.00 MHz	35.00 dBmV
3	Locked	ATDMA	2	5120 kSym/s	29.40 MHz	35.50 dBmV
4	Locked	ATDMA	1	5120 kSym/s	35.80 MHz	35.25 dBmV

 

 

How do I get the upstream line-levels and SNR inspected at the plant? An in-home tech cannot do that.

Expert

Re: Continual "No Ranging Response received - T3 time-out"

Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home.



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New Poster

Re: Continual "No Ranging Response received - T3 time-out"

I totally understand.

 

I feel like cutting out the middle man would be less timeconsuming in this instance. I, unforutnately, don't have hours to commit to being available away from work for a Tech to make their visits, especially considering they're going to charge a fee for the visit just to escalate to an engineer at the plant anyways.

 

 

New Poster

Re: Continual "No Ranging Response received - T3 time-out"

Here is an example of what I am talking about. A random spike on Upstream - almost outside of spec. Channel 3 spiked 12.75 dBmV.

 

Modem is connected directly to Comcast's ground block at the houses demarc.

 

Channel 	Lock Status 	US Channel Type 	Channel ID 	Symbol Rate 	Frequency 	Power
1	Locked 	ATDMA	4	5120 kSym/s	16.60 MHz	39.50 dBmV
2	Locked 	ATDMA	3	5120 kSym/s	23.00 MHz	39.75 dBmV
3	Locked 	ATDMA	2	5120 kSym/s	29.40 MHz	48.25 dBmV
4	Locked 	ATDMA	1	5120 kSym/s	35.80 MHz	38.75 dBmV
New Poster

Re: Continual "No Ranging Response received - T3 time-out"

Have a tech coming on sunday (8/18).

 

Here's to hoping I can convince them to open a line-maintenance ticket.