7 Messages
Need someone to tell me something other than 'reboot your modem'
I've had intermittent Internet issues since I moved to my current address about 2 years ago. Usually in the middle of the day, about 2-4 times a week, I loose connection. When I call Comcast, all I get is 'reboot your modem' but since outages only last about 10 minutes, it's back by then anyway. I've tried multiple modems and once I actually was able to get a tech to come out and he was able to get someone else to fix it but that only lasted a few months. Everything I've researched says that there's an issue outside or leading up to my home.
How do I get someone at Comcast to help? Here's the log from latest outage:
11:05:28
Wed Mar 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
11:05:28
Wed Mar 20 2024 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
11:05:28
Wed Mar 20 2024 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
11:05:29
Wed Mar 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
11:05:30
Wed Mar 20 2024 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
11:05:30
Wed Mar 20 2024 Warning (5) Dynamic Range Window violation
11:05:30
Wed Mar 20 2024 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
11:05:30
Wed Mar 20 2024 Warning (5) Dynamic Range Window violation
11:05:30
Wed Mar 20 2024 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
11:05:30
Wed Mar 20 2024 Warning (5) Dynamic Range Window violation
11:05:30
Wed Mar 20 2024 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
11:05:30
Wed Mar 20 2024 Warning (5) Dynamic Range Window violation
11:05:38
Wed Mar 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
11:05:41
Wed Mar 20 2024 Notice (6) CM-STATUS message sent. Event Type Code: 8; Chan ID: 8; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
11:06:10
Wed Mar 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
11:06:12
Wed Mar 20 2024 Notice (6) CM-STATUS message sent. Event Type Code: 8; Chan ID: 8; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
11:06:12
Wed Mar 20 2024 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
BruceW
Gold Problem Solver
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26.4K Messages
1 year ago
The most common cause of the errors you are seeing is the link between your modem or gateway and Comcast's network. Network connection problems are often due to poor coax connections or damaged coax cable, usually in or near your home. Running the cable through a surge protector, a defective splitter, or too many splitters can cause signal problems as well. If there is an amplifier in the line make sure it's getting power.
If you want to troubleshoot this yourself, please see Internet Troubleshooting Tips. If you still need help, please post your Internet plan speed and the following information from your modem or gateway (from http://192.168.100.1 or http://10.0.0.1):
Copy and pasted text is preferred over images. Be aware that, if you post any images, your message will be made Private for a time, as all images must be approved by the Forum Moderators before the messages containing them become generally visible.
If you can't find the problem or you'd rather have Comcast take care of it and an employee does not respond to your message here, call them at the phone number on your bill or 1-800-Comcast, or use one of the options on https://www.xfinity.com/support/contact-us/. It's not likely they can fix the problem remotely. If not, insist they send a tech out to identify the cause and correct it.
If the tech finds bad coax, splitters, amplifiers, or connections in your home (even if Comcast originally supplied them) you'll probably have to pay for the visit (approx $100) unless you have their Service Protection Plan ( https://www.xfinity.com/support/articles/service-protection-plan, closed to customers that don't already have it). If the trouble is due to a faulty Comcast rental device or anything outside your home you shouldn't be charged.
Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.
(edited)
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EG
Expert
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110.6K Messages
1 year ago
Please also copy all of the text in its entirety of the *Downstream Power Levels*, the *SNR's* (Signal to Noise Ratios), and the *Upstream Power Level* numbers and paste them into your next post.
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user_2qzv2f
7 Messages
1 year ago
Here's all the downstream & upstream info from my modem (really hoping a Comcast employee sees this and takes pity on me):
DOWNSTREAM:
Channel Lock Status Modulation Channel ID Freq. (MHz) Pwr (dBmV) SNR (dB) Corrected Uncorrected
1 Locked QAM256 17 519.0 9.3 43.0 14790 964
2 Locked QAM256 1 417.0 8.4 43.1 28266 1014
3 Locked QAM256 2 423.0 8.2 43.3 19724 1621
4 Locked QAM256 3 429.0 9.2 43.4 19518 1008
5 Locked QAM256 4 435.0 9.6 43.6 19454 1062
6 Locked QAM256 5 441.0 9.6 43.4 14427 850
7 Locked QAM256 6 453.0 9.3 43.4 14076 870
8 Locked QAM256 7 459.0 8.8 43.2 23659 987
9 Locked QAM256 8 465.0 8.8 43.2 13300 853
10 Locked QAM256 9 471.0 8.9 43.2 18739 2324
11 Locked QAM256 10 477.0 9.5 43.3 15031 3416
12 Locked QAM256 11 483.0 9.9 43.3 9703 1007
13 Locked QAM256 12 489.0 10.0 41.9 11386 789
14 Locked QAM256 13 495.0 10.1 42.9 7948 956
15 Locked QAM256 14 501.0 9.5 43.2 6788 1066
16 Locked QAM256 15 507.0 9.6 43.2 5901 844
17 Locked QAM256 16 513.0 9.5 43.1 3420 748
18 Locked QAM256 18 525.0 8.9 42.3 4452 641
19 Locked QAM256 19 531.0 9.1 42.9 3649 619
20 Locked QAM256 20 537.0 9.0 43.1 4719 690
21 Locked QAM256 21 543.0 9.1 43.0 8315 805
22 Locked QAM256 22 549.0 9.8 43.1 15118 923
23 Locked QAM256 23 561.0 9.1 42.5 10713 727
24 Locked QAM256 24 567.0 8.8 42.0 3531 736
25 Locked OFDM PLC 25 693.0 6.3 39.4 1581203783 48919
26 Locked QAM256 26 573.0 8.1 41.2 952 671
27 Locked QAM256 27 579.0 7.6 42.2 1593 613
28 Locked QAM256 28 585.0 8.0 40.5 3264 787
29 Locked QAM256 29 591.0 8.9 42.5 26545 1230
30 Locked QAM256 30 597.0 9.6 43.1 614277 2004096
31 Locked QAM256 31 603.0 9.8 43.0 112705 330516
32 Locked QAM256 32 609.0 9.3 42.7 568615 1913716
UPSTREAM:
Channel Lock Status Channel Type Channel ID Symb. Rate (Ksym/sec) Freq. (MHz) Pwr (dBmV)
1 Locked SC-QAM 5 5120 16.3 41.8
2 Locked SC-QAM 6 5120 22.8 41.8
3 Locked SC-QAM 7 5120 29.2 42.5
4 Locked SC-QAM 8 5120 35.6 42.8
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EG
Expert
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110.6K Messages
1 year ago
This may or may not be the root cause of the problem (YMMV) but it should be addressed regardless.
The downstream power is too high. It may be over-driving the front-end receiver circuit of the modem. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.
Is there a drop amplifier on the coax cable line leading to the modem ? If so, try removing / bypassing it and see. If not, you can try installing a -6 dB forward path-only attenuator pad such as this one on the coax port on the rear of the modem to knock that power level down and see;
https://www.amazon.com/FPA6-54-Forward-Attenuator-DOCSIS-Internet/dp/B08KTRC3XZ
Good luck !
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EG
Expert
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110.6K Messages
1 year ago
@BruceW
Looks like we both responded at the same time, LOLLL !! 😃
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XfinityAmira
Official Employee
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4.1K Messages
1 year ago
Hello @user_2qzv2f! We appreciate you taking the time to reach out on our Forums. We value you as a customer, so it's upsetting to hear about the ongoing connection issues you've been experiencing. As someone who works from home, I absolutely understand the importance of having a solid and steady connection. My team is here to help!
I do see @EG & @BruceW provided some wonderful and helpful feedback/suggestions based on the signal levels you posted. When you have a chance, let us know if the suggestions provided helped on your end at all.
We look forward to hearing back from you!
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user_2qzv2f
7 Messages
1 year ago
I ordered the attenuator EG suggested and it should come tomorrow. I'll post after about a week if that does the trick, or sooner if the issue occurs again.
Thanks all (especially @EG ) for the help :)
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EG
Expert
•
110.6K Messages
1 year ago
Thanks for the update. Hope things hold up for you. Good luck ! Now closing you solved topic.
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