I have a Cable ONE Certified cable modem, but registration says it is not supported. Why?
Cable ONE certification is based upon cable modem specifications provided by the manufacturer, as well as required Cable ONE standardizations. To be allowed through registration, Cable ONE validates a cable modem's compatibility with our network by testing various settings on the cable modem. If we detect that a cable modem is incompatible for any reason, no matter the model, signup will not occur. In rare cases, particular certified cable modems may exhibit deviations from the specs we were given and may in fact be incompatible with our network. For security reasons, the specifications validated are not available for public knowledge.