Abstract :
The film and video production industry in California is using 45 Mbps fiber optic telecommunications lines to increase the speed with which it can send work in progress for review, approval and interactive editing. No longer must film or video languish in the back of a car or in the belly of an airplane-it can be sent in real time across town, across the country, and around the world. Compressed video and audio are sent over one-way circuits at US composite NTSC broadcast quality, or as component digital (D1) video, using part of a US DS3 data standard circuit. The US tariffed service provides up to four channels of 15 kHz audio with the video. A DS3 circuit carrying video in two separate one-way transmissions can also accommodate several auxiliary capabilities, such as videoteleconferencing, remote machine control, a mouse/pointer, or up to six channels of 20 kHz audio
