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xapache
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Thursday, June 17th, 2021 8:54 PM

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Started Unicast Maintenance Ranging - No Response received - T3 time-out

It seems I'm not alone in this but I have come to the end of figuring out if it is my modem vs. the lines.

There is one Comcast installed splitter which provides the connection to my rooms and separate internet cabinet.  There are no branches from here to my cable modem.

My logs, most recent drop was about an hour ago.

Upstream power seems high based on other replies I've seen, but I'm not sure where to go from this point?

Frequency start Value
This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
Starting Frequency
<tabindex=-1>Startup Procedure</tabindex=-1>
Procedure Status Comment
Acquire Downstream Channel 507000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enable BPI+
IP Provisioning Mode Honor MDD IPv6 only
<tabindex=-1>Downstream Bonded Channels</tabindex=-1>
Channel Lock Status Modulation Channel ID Frequency Power SNR / MER Unerrored Codewords Correctable Codewords Uncorrectable Codewords
1 Locked QAM256 5 507000000 Hz 6.2 dBmV 43.5 dB 155277910 5863 5125
2 Locked QAM256 2 489000000 Hz 5.8 dBmV 43.6 dB 154077924 6357 5580
3 Locked QAM256 3 495000000 Hz 5.8 dBmV 43.4 dB 154080448 6334 5249
4 Locked QAM256 4 501000000 Hz 5.7 dBmV 43.3 dB 154082777 6158 5601
5 Locked QAM256 6 513000000 Hz 6.2 dBmV 43.4 dB 154087695 5939 5615
6 Locked QAM256 7 519000000 Hz 6.3 dBmV 43.5 dB 154092564 5935 4827
7 Locked QAM256 8 525000000 Hz 6.4 dBmV 43.4 dB 154096215 5992 5304
8 Locked QAM256 9 531000000 Hz 6.3 dBmV 43.5 dB 154098565 5914 4955
9 Locked QAM256 10 537000000 Hz 6.5 dBmV 43.5 dB 154112351 5704 5391
10 Locked QAM256 11 543000000 Hz 6.3 dBmV 43.6 dB 154116599 5397 4839
11 Locked QAM256 12 549000000 Hz 6.7 dBmV 43.6 dB 154120102 5274 4624
12 Locked QAM256 13 555000000 Hz 6.5 dBmV 43.5 dB 154124109 5418 5026
13 Locked QAM256 14 561000000 Hz 6.5 dBmV 43.3 dB 154128259 5278 4721
14 Locked QAM256 15 567000000 Hz 6.7 dBmV 43.5 dB 154131601 5442 5059
15 Locked QAM256 16 573000000 Hz 6.5 dBmV 43.4 dB 154135647 5301 4419
16 Locked QAM256 17 579000000 Hz 6.8 dBmV 43.4 dB 154139576 5148 4981
17 Locked QAM256 18 585000000 Hz 7.0 dBmV 43.3 dB 154179328 5156 4551
18 Locked QAM256 19 591000000 Hz 7.2 dBmV 43.2 dB 154182842 4947 4921
19 Locked QAM256 20 597000000 Hz 7.3 dBmV 43.3 dB 154187724 4717 4580
20 Locked QAM256 21 603000000 Hz 7.4 dBmV 43.2 dB 154191402 4655 4551
21 Locked QAM256 22 609000000 Hz 7.7 dBmV 43.3 dB 154194722 4692 4427
22 Locked QAM256 23 615000000 Hz 7.2 dBmV 43.2 dB 154198517 4647 4424
23 Locked QAM256 24 621000000 Hz 7.4 dBmV 43.1 dB 154202513 4479 4366
24 Locked QAM256 25 627000000 Hz 7.3 dBmV 43.1 dB 154206407 4595 4425
25 Locked QAM256 26 633000000 Hz 7.1 dBmV 43.0 dB 154210097 4403 4499
26 Locked QAM256 27 639000000 Hz 6.9 dBmV 43.0 dB 154214915 4291 4284
27 Locked QAM256 28 645000000 Hz 6.6 dBmV 42.9 dB 154218318 4376 3914
28 Locked QAM256 29 651000000 Hz 6.2 dBmV 42.6 dB 154222275 4479 4295
29 Locked QAM256 30 657000000 Hz 6.2 dBmV 42.4 dB 154225778 4300 3759
30 Locked QAM256 31 663000000 Hz 7.0 dBmV 42.9 dB 154227554 4197 4248
31 Locked QAM256 32 669000000 Hz 6.7 dBmV 42.8 dB 154228466 4344 3931
32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 0
<tabindex=-1>Upstream Bonded Channels</tabindex=-1>
Channel Lock Status Modulation Channel ID Frequency Power
1 Locked ATDMA 1 35600000 Hz 50.3 dBmV
2 Locked ATDMA 2 29200000 Hz 50.3 dBmV
3 Locked ATDMA 3 22800000 Hz 50.3 dBmV
4 Locked ATDMA 8 16400000 Hz 52.3 dBmV
5 Locked ATDMA 9 39600000 Hz 50.8 dBmV
6 Not Locked Unknown 0 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Hz 0.0 dBmV
<tabindex=-1>Downstream OFDM Channels</tabindex=-1>
Channel Lock Status Modulation / Profile ID Channel ID Frequency Power SNR / MER Active Subcarrier Number Range Unerrored Codewords Correctable Codewords Uncorrectable Codewords
1 Locked 0, 1, 2, 3 33 690000000 Hz 6.5 dBmV 41.0 dB 1228 ~ 2867 660040591 560994725 559
2 Not Locked 0 0 0 Hz 0.8 dBmV 0.0 dB 0 ~ 4095 0 0 0
<tabindex=-1>Upstream OFDMA Channels</tabindex=-1>
Channel Lock Status Modulation / Profile ID Channel ID Frequency Power
1 Not Locked Unknown 0 0 Hz 0 dBmV
2 Not Locked Unknown 0 0 Hz 0 dBmV
Current System Time: Thu Jun 17 15:46:12 2021
System Up Time: 27:12:27

Question

 • 

Updated 

4 years ago

7.3K

3

0

EG

Expert

 • 

110.2K Messages

4 years ago

Yes. The upstream power is on too high and it may be intermittently fluctuating even higher to out of spec levels (It's already out of spec on channel #8. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

In an effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1000 MHz, bi-directional, and no gold colored garbage from Radio Shack, Home Depot, Target, etc. Splitters should be swapped with known to be good / new ones to test.

Also check the coax cable for any damage such as cuts, nicks, kinks, sharp bends, etc.

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two-way splitter connected directly off of the drop from the street / pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.


Good luck with it !

0

0

CCTambrey

Gold Problem Solver

 • 

3.4K Messages

4 years ago

Hello, @xapache!

We appreciate you reaching out to us here on the Xfinity forums for support with your network.

I see our wonderful expert @EG has provided some troubleshooting steps and I wanted to check-in to see if you were able to get this figured out with that advice, or if you are still in need of a hand?

 

2

xapache

New Poster

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4 Messages

@ComcastTambrey 

The solution provided did not resolve the issue.  Looks like I will need a tech to come out to check the lines as I'm out of ideas.

Thank you,

Steve

4 years ago

0

CCEthan

Official Employee

 • 

1.4K Messages

I appreciate you checking everything @xapache. Send us a private message using the chat icon near the bell icon top right with your name and address and we can get you taken care of.

I no longer work for Comcast.

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

4 years ago

0

EG

Expert

 • 

110.2K Messages

4 years ago

@xapache 

Sorry that the tips didn't help. Yes, you'll need a tech 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.


Good luck !

(edited)

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