I've been a Cox Ultimate subscriber for a few years now. I've never had any trouble (using a Motorola 6120 modem and an Apple Airport Time Capsule handling multiple wired and wireless clients).
Starting on or about October 20, the internet service would just periodically spontaneously stop. The only thing that would bring it back would be restarting the cable modem. Sometimes I could get into the modem through 192.168.100.1 on a browser and I could hit the restart button there; other times, the configuration pages wouldn't load so I'd have to physically yank the AC power on the modem then reconnect.
I PM'ed one of the helpful Cox Techs who participates in this forum and he suggested I at least upgrade my modem to an 8-channel version. It's something I should have done anyway since Cox supported it, so I had no issues with upgrading my hardware, problem or not. I swapped it in on 10/25 with a Motorola 6141, provisioned it, and within a day I was still getting service dropouts. A few days later, I replaced the Airport Time Capsule for good measure. Still, dropouts!
I put in a call to Cox and they sent someone out. They found no issues with the signal readings they took. They checked all the coax in my house, connections, etc. and gave me a clean bill of health. Within a day of that visit, the service cut out! To make matters worse, starting on about Nov. 6, the cutouts started happenening every few hours, instead of every few days. Every time I had to yank the AC power and wait a few minutes for service to resume.
I got on the phone with Cox again, and they put me through to the Tier 2 folks. A tech came out to the house on Nov. 12. His verdict was the Motorola 6141 and/or whatever firmware it was using is incompatible with Cox's Ultimate service as of the time they doubled their speeds on or about Oct. 20. His fix was to replace my modem with a Cisco DPC3010. Since then, I've been trouble-free. Three days and counting now. It's nice not to have to yank the plug several times per day.
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