Most cable television networks in the US were installed long before anyone thought of offering telephone service on them too, so the facility to make them interactive has to be retrofitted, and Scientific-Atlanta Inc yesterday announced its answer to the problem in the form of CoAccess, which is compatible with the public switched telephone network and is designed to enable enable switched telephone, video, data and interactive television services to be delivered over broadband cable networks; the dual telephone and cable television capabilities are provided by cable head-end and residential products to be integrated into the company’s Fiber to the Serving Area hybrid fibre optic and coaxial broadband system architecture; the CoAccess Network boxes are one foot long and are designed to be attached to the outside of a house and will cost about $300 per cable subscriber.