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marbro's avatar
New Contributor

No Ranging Response received - T3 time-out

Several months ago I started experiencing internet connectivity issues. The connection would drop and not return until after a hard reboot. When I called tech support I was told that the cox "system" did not play well with the Motorola SB modem. So, in an attempt to troubleshoot the problem I purchased a Cisco modem from Cox, no change. I then returned the Cisco and re-installed Motorola. Simultaneously, I made several setting changes to my D-Link router. The end result was things improved until this week. Now I get random drops for several minutes and then the connection returns, then drops and returns.

The modem log shows a series of errors:

Dec 15 2013 20:26:15 6-Notice I401.0 TLV-11 - unrecognized OID;CM-MAC=e4:83:99:77:b3:a9;CMTS-MAC=00:24:14:63:6a:b5;CM-QOS=1.1;CM-VER=3.0;
Dec 15 2013 20:26:15 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=e4:83:99:77:b3:a9;CMTS-MAC=00:24:14:63:6a:b5;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:19 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=e4:83:99:77:b3:a9;CMTS-MAC=00:24:14:63:6a:b5;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:13 6-Notice N/A Cable Modem Reboot due to T4 timeout ;CM-MAC=e4:83:99:77:b3:a9;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Dec 15 2013 20:25:32 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=e4:83:99:77:b3:a9;CMTS-MAC=00:24:14:63:6a:b5;CM-QOS=1.1;CM-VER=3.0;
Dec 15 2013 20:25:32 3-Critical R07.0 Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=e4:83:99:77:b3:a9;CMTS-MAC=00:24:14:63:6a:b5;CM-QOS=1.1;CM-VER=3.0;

I've seen other threads that address the similar issues but have not seen a solution. Any assistance would be greatly appreciated.


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  • KipK's avatar
    Valued Contributor II

    Sigh. I'm all for technicians engaging customers and expressing their personalities, but I wish they'd keep certain opinions to themselves. Our system doesn't have any problem with Motorola modems.

    I live in Hampton Roads, which has a system setup just like Orange County, with a Cisco CMTS (Cable Modem Termination System) and Motorola DAC (Digital Addressable Controller), and I'm on my third Motorola modem in seven years. Aside from accidentally letting the SB6120 die from overheating, my only problems have been signal-related issues that have been fixed by maintenance techs or by myself.

    Our diagnostic page is telling me that your modem has a high power adjustment count, and you are getting an occasional T3 which can have any number of noise-related causes, so there seems to be some kind of line problem.

    So we'll have to suggest the usual: check all the cable connections you have access to, make sure they're clean and secure and in good repair. Bypass any splitters that can be bypassed, replacing them with single longer cable runs or inline couplers if the cables can't be replaced. If you have a signal amplifier, unplug the power supply if you know where it is, then plug it back in and make sure it's plugged in securely. If the cable modem or amplifier are plugged into surge protectors, the surge protectors may be worn out and may need to be replaced or bypassed.

    If none of these changes stabilize the connection, then we'll need to place a service call to investigate further.