One man’s losing fight to use his own cable modem

Elbert Davis of Crown City, Ohio, is a customer of Armstrong, a much smaller cable company with about 800,000 subscribers. He owns a Motorola/Arris Surfboard SB 6121 modem that he’d like to use instead of the Arris CM820 supplied by Armstrong. But the cable company won’t allow it, despite offering no proof that it would harm the network or is incompatible. (The Surfboard is a DOCSIS 3.0 device certified by CableLabs, the cable industry’s equipment testing body.) – Jon Brodkin, Ars Technica