Activity: 25 Replies | 10 Subscribers
I have been experiencing the following modem error - as reported in the log at 192.168.100.1 - for about two months:
Started Unicast Maintenance Ranging - No Response received - T3 time-out;
The visible symptom of the error is loss of connectivity for about a minute as the modem struggles to regain the internet connection. This is despite a very strong, clean signal being measured from the pole and throughout the house by four technicians.
This error obviously duplicates those being reported here by other customers widely spread out across the US, so I wanted to document the troubleshooting steps and technician interventions that have taken place to date - in the hope of moving the issue forward.
Bottom line: After two months of extensive investigation, there has been no change and no positive diagnosis. I still experience T3 disconnects daily. This issue is with Cox, and not with anything between the street pole and my computer.
For reference, I have experience this error with three modems: Motorola 6180, 6121, and Cisco 3010
Troubleshooting and technician steps, in order:
Could be random fluctuating power levels on the cable either from the street box to your house or somewhere in your house, Only way to explain this error constantly happening, If its random it more then likely is normal when they check the levels so they dont notice it, Because if you have went through numerous modems and still get this issue its def something Line/System related for Cox to fix.
You should log into your modem and take Screen shots of the power levels at random times of the day, This way you can post them here if they appear different from each other, Will help a cox tech figure out the problem!
Same situation here. The intermittent signal loss has been ongoing for approximately 2 months now. Cox tech support only confirms signal strength to house and confidently ensures me it has to do with my equipment. I've swapped out splitters, bypassed router, etc. They sent a tech out to my house who arrived late. By the time he arrived, I had already left to be at another appointment and he ended up speaking with my wife, who had no idea of the problem. The tech cycled my coax cable, told her the problem was fixed and left...then charged me $45. Insane. Please let me know if anyone is able to find a fix.
Just to update this post: I have now taken the additional step of purchasing a decent battery backup unit with power-conditioner capability, just to eliminate the possibility that fluctuating power levels could be causing the issue. Predictably, the T3 disconnects continued just the same, even with modem and router plugged into battery backup. (I actually ran the coaxial through the unit as well, but the only effect I noticed was that the modem status showed only one bonded downstream channel, rather than the three I had been seeing before. Disconnecting the coax passthrough in the battery backup box restored the three bonded channels. The T3 timeouts occurred whether I had the coax running through the battery box or not.)
I can't come to any conclusion here other than the problem is with Cox's line outside my house. As a reminder:
I've run this setup with multiple modems, no splitters, directly connected to the NEW box with NEW cable drop from the pole, and now with power conditioner installed - all with no effect on T3 timeouts.
I'm not sure where to go from here.
Check your private messages. Could you reply to mine with your account details please?
Cox Support Forums Moderator
Same problem for us.
Problem has persisted across
I'm starting to gather cable modem diagnostics. This problem is maddening.
Still having T3 disconnect issues. Here's what I've done over the last two months:
I have been having the same problem for over 6 months, and it's getting worse lately. Like you I have replaced everything I could replace: modem, router, network card, network cables, etc several times over. It never fixes the problem. I called Cox and was told "Signal is fine, it's a problem with your equipment". I find that hard to impossible to believe since I've replaced all the equipment. If anyone finds a fix please post it!
Please check your private messages.
Wow, this looks remarkably like my experience. 3 tech visits (2 came out at one time once). I'm like the first or second house off of the neighborhood branch; one tech said I couldn't get a better connection without going to fiber. Couple modems and routers, dozens of reboots and late night calls. My internet would just drop for 1-5 min at a time and the firewall on the router would report DOS attacks at the same time. I finally contacted Netgear to see if they could explain the DOS attacks, and they suggest changing my DNS to a public one instead of Cox's. This was 6 months ago, and I haven't had any major outages until a few weeks ago when my modem randomly rebooted. Upon contacting Cox, I was told the signal looks fine and they didn't see any reboot sent.
These are just a few lines from my modem log file. I'm curious though if anyone else has changed their DNS settings and/or if their firewall logs are also showing DOS hits.
I am experiencing the same problem at home: Getting the above errors and internet will go out for minutes at a time at random intervals. Spoken with Cox support over 6 times about it and still no solution.
There can be numerious causes for signal related log events. Could you post your signal stats and logs from http://192.168.100.1 so we can take a look?
So what's the fix here? I see a ton of people (myself included) that have the same problem but not once have I seen someone say Cox fixed the problem to their satisfaction. Being a network engineer, I can readily see that "most" people on here have proven that the problem is not their own and it lies solely in the hands of Cox. However, it doesn't seem that anyone wants to do anything about it. When you pay $70/mo for internet access, you expect it to work. The onus lies with Cox, not the paying consumer/customer.
At some point, someone from Cox needs to troubleshoot one of these issues all the way up the line. Someone needs to own the issue and be held responsible for a fix. Then, maybe they can learn from it.
In addition, charging customers for phantom fixes like what happened to Levi is no way to build confidence. You might think that's an isolated incident. Well, it happened to me too.
Usually these issues are best handled by having a technician come out and troubleshoot a signal or equipment issue. The nature of the issue is such that it indicates a communication issue with a relatively small portion of the network therefore they're usually an indication of a problem in the home or close to it. If the problem is found to be at the tap servicing your residence or beyond the issue would be escalated to our maintenance team for further troubleshooting.