The electrical signal is amplified and broadcast over a large diameter coaxial backbone cable. Finally, the signal is delivered to individual subscribers over taps and coax drops. This system allows for maximum flexibility, including interactive multimedia connections that allow each consumer to choose his or her own programs. Each platform can provide video services and can be migrated to higher capacity as demand increases for intera ctive video services. Fibers are extended from the HDT to the pedestal.
Coaxial cable carries the signal from the pedestal to the home.
Only programs th at are requested by the subscriber are transmitted. The system has the potential to serve an additional 21,000 customers in the Washington metropolitan area. The ADSL central office unit works with an ADSL remote terminal located at the customer's premises. The remote terminal separates the POTS or ISDN signal from the compressed video signal. Video programming over the system must be pre-encoded, digitized, and stored on a video server.