06-27-2013 05:07 PM
Cable modem rebooting many times a day. Do to T4 issues and have had many tech's come and check my connection. They all tell me my levels are good, but my connection drops randomly about 20 or more times a day for 1-2mins then it runs good until the next drop. This has been going on for about 1 month.
Many parts of my connection have been replaced by this point, new connecters, new splitter, new cable from splitter to modem, new modem
Started with an SB6121 modem, I just replaced it with SB6141 and this is still going on. I have a Cisco DPC3008 coming in a few days but don't think its modem related any longer.
What other things can I try or how can I escalate this issue? I seem to be just going in a loop now to the point I'm having to call comcast every day to report the issue and then get 1-2 day wait for a tech.
Jan 01 1970 00:00:58 3-Critical R06.0 Unicast Maintenance Ranging attempted - No response - Retries exhausted
Jan 01 1970 00:00:58 3-Critical R03.0 Ranging Request Retries exhausted
Jan 01 1970 00:00:55 3-Critical R02.0 No Ranging Response received - T3 time-out
Jan 01 1970 00:00:14 6-Notice N/A Cable Modem Reboot due to T4 timeout
06-27-2013 05:12 PM
We need more information please:
- Post your upstream and downstream signal levels. Click the link or type: http://192.168.100.1 or http://10.0.0.1 into your browser. We are interested in your power levels (dBmV) and your Signal to Noise Ratio (SNR). You may also want to contact Comcast and ask for your upstream SNR (uSNR) and receive level.
- Post your modem’s error logs.
- Post the make and model of your modem.
- Post the make and model of your router if you have one.
- Let us know if you contacted Comcast or had a tech visit.
- Let us know what the lights on your modem are doing when you are having problems.
- If you have already posted some of this information, you don't need to post it again.
06-27-2013 05:36 PM - edited 06-27-2013 05:37 PM
Channel ID 1 2 3 4 5 6 7 8
Frequency 687000000 Hz 693000000 Hz 699000000 Hz 705000000 Hz 711000000 Hz 717000000 Hz 723000000 Hz 729000000 Hz
Signal to Noise Ratio 36 dB 36 dB 36 dB 36 dB 36 dB 36 dB 36 dB 36 dB
Downstream Modulation QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256 QAM256
Power Level The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading 3 dBmV 3 dBmV 3 dBmV 3 dBmV 3 dBmV 3 dBmV 2 dBmV 2 dBmV
Channel ID 11 10 12
Frequency 29500000 Hz 36400000 Hz 24200000 Hz
Ranging Service ID 12535 12535 12535
Symbol Rate 5.120 Msym/sec 5.120 Msym/sec 2.560 Msym/sec
Power Level 45 dBmV 45 dBmV 43 dBmV
Upstream Modulation  QPSK
Ranging Status Success Success Success
Router is: ASUS RT-AC66U running DD-WRT
Nothing on router stops working, WiFi or local network ever drops when issue hits.
Modem light's are (when problem happens after all the lights drop but power):
Some times Down and Up changes then changeds back:
08-08-2013 10:36 AM
I have been having the same T-4 timeout issue since moving here 12 days ago. Each time I call Comcast they tell me the wait time is 2 or 3 days for a tech to come out and look at my modem. The case was escalated last week, the escalation group decided to do nothing and close the ticket. They never contacted me. I think it is time to find another carrier, these people are spinning their wheels.
08-26-2013 01:43 PM
I'm having the same problem with the following equipment:
Modem: Motorola SB6121
Router: ASUS RT AC66U
Channel ID 1 3 5 6 Frequency 333000000 Hz 345000000 Hz 357000000 Hz 363000000 Hz Signal to Noise Ratio 35 dB 35 dB 35 dB 36 dB Downstream Modulation QAM256 QAM256 QAM256 QAM256 Power Level The Downstream Power Level reading is a snapshot taken at the time this page was requested. Please Reload/Refresh this Page for a new reading -6 dBmV -6 dBmV -6 dBmV -5 dBmV
Signal Stats (Codewords) Bonding Channel Value Channel ID 1 3 5 6 Total Unerrored Codewords 51331347 51331007 51329121 51330168 Total Correctable Codewords 251 257 304 380 Total Uncorrectable Codewords 2590 2913 4818 3639
03-12-2014 12:46 AM
I had the same issue. It worked fine most times but
every few hours seems to get this T4 timeout.
Tried replacing the CMD31T modem with SB6141.
No luck. At least the SB6141 allowed me to access its status page.
But then I noticed a couple of weeks ago that the cable going
up into the atttic was bent and pulled out of the fastener by about 1/4 inch.
So someone (probably the workers who were working to remove the trees
and shrubbery aroud the house) had pulled it out rather strongly
and probably damaged it somewhat. And I think the connection was bad when it
was windy and the wind moved the cabling around, is my guess.
(It was windy a few weeks back.)
After I just moved it around a bit and straightenned the cable out, I have had
no T4 timeouts for more than a week.... Prob should replace the cable someday.
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