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Forum Discussion
ezicefield
Jan 27, 2016Follower
C7000-100NAS randomly drops internet connection
Hello, My C7000-100NAS modem seems to randomly drop it's Comcast connection. This happen on 2.4 ghz, 5 ghz, and wired connections. There is no pattern, however the dropped connection usually last...
8th_Day
Jun 29, 2016Aspirant
Need help. The firmware release has not solved the issue with Comcast. We have Comcast Internet only since they started in Illinois area and never had cable TV. Invested in the newer technology because you had a Comcast Certification, so I did not expect these types of issues.
With instructions, we can do and check anything.
Hardware Version | 1.05 |
Mac & Windows Network | |
Firmware Version | V1.01.20 |
Internet only - No Cable - Comcast
Wireless is Itv and Roku
Loosing connections.
These events keep happening over and over again.
Fouter Event Log
1970-1-1, 00:00:39 | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:7f:b9:d7:20:80;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0; |
1970-1-1, 00:00:42 | Notice (6) | WiFi Interface [wl0] set to Channel 6 (Side-Band Channel:N/A) - Reason:INIT |
1970-1-1, 00:00:42 | Notice (6) | WiFi Interface [wl1] set to Channel 153 (Side-Band Channel:N/A) - Reason:INIT |
1970-1-1, 00:00:46 | Critical (3) | No Ranging Response received - T3 time-out;CM-MAC=b0:7f:b9:d7:20:80;CMTS-MAC=00:01:5c:7f:9a:5a;CM-QOS=1.0;CM-VER=3.0; |
1970-1-1, 00:00:51 | Notice (6) | Honoring MDD; IP provisioning mode = IPv6 |
2016-6-27, 16:15:21 | Warning (5) | Dynamic Range Window violation |
2016-6-29, 09:47:55 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:7f:b9:d7:20:80;CMTS-MAC=00:01:5c:7f:9a:5a;CM-QOS=1.1;CM-VER=3.0; |
2016-6-29, 09:47:55 | Warning (5) | Dynamic Range Window violation |
2016-6-29, 13:43:12 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:7f:b9:d7:20:80;CMTS-MAC=00:01:5c:7f:9a:5a;CM-QOS=1.1;CM-VER=3.0; |
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. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Current System Time:Wed Jun 29 15:05:57 2016 |
- 8th_DayJun 29, 2016Aspirant
Additional error just moments ago
2016-6-29, 15:05:51 Notice (6) WiFi Interface [wl0] set to Channel 1 (Side-Band Channel:N/A) - Reason:INTERFERENCE This happened between two other errors dated 2016-06-27
1970-1-1, 00:00:42 Notice (6) WiFi Interface [wl0] set to Channel 6 (Side-Band Channel:N/A) - Reason:INIT 1970-1-1, 00:00:42 Notice (6) WiFi Interface [wl1] set to Channel 153 (Side-Band Channel:N/A) - Reason:INIT Remember that only iTV and Roku are wireless
Thank you
- dlf_texasSep 16, 2016Aspirant
I too had internet drop issues.
I had very similar power levels to the ones you posted. I see also that you have a ton of uncorrectable errors which was what I had also.
I focused my efforts on eliminating the uncorrectable errors. I read in other places that the ideal downstream power level is 0db and upstream should not be more than 50db. My levels were 4db to 6db downstream and 45db~46db upstream so I decided to try a 3db attenuator. Since I installed the 3db attenuator a few weeks ago I have not seen any unrecoverable errors. My downstream power levels are all below 3db now and my upstream levels are 47db~49db. I bought the 3db attenuator on Amazon for about $9. I will post here again if problems return. If you don't hear from me it means it is still working fine.
One other note, with so many uncorrectable errors you might have physical connection issues. Check all coax connections to make sure they are snug.
- dlf_texasSep 26, 2016Aspirant
Well, I just found out my teenage boys have been reseting the modem on a regular basis.
So my fix was not a fix after all.
Back to debug mode!
- NCsandhillsSep 28, 2016Guide
It is often very difficult to determine if the modem-router is at fault (unstable, corrupted OS, etc.) or if the problem is caused by the ISP (throttled streaming, downgraded service, etc.). Thus, IT folks always suggest to "reset" the device, which often seems to correct the problem. In this case, the "reset" performs two functions. It clears any faults in the modem-router's operation, restoring all parameters; and reestablishes the ISP connection, restoring the identity and service subscription of the customer. And thus, download speeds and stable service are restored.
As in many cases, "engineering solutions" to such problems can be both "simple and effective". In this case, a universal solution to both potential causes would be to install a timer, which will shut off the modem-router and then it turn back on, automatically restoring/resetting modem-router performane and ISP subscription identity. For example, set the timer to turn off the modem-router at 3am, and restart at 4am, when no one requires internet access -- or some other convenient off-on setting (and "off time duration"). In some cases, the "timer reset" may be required several times during the day, again coordinated with need for internet access. This solution is elegant, simple and automatic. And, for those concerned about the ecosystem - it may save energy and reduce greenhouse gas emmissions.