Digital video editing has brought great efficiency to the entertainment industry by allowing films to be quickly transported and revised. The editing task can now be outsourced to another country. One problem with digital video is the large bandwidth -- 140 Mb/s -- of an uncompressed signal. Almost all video compression schemes are lossy, so compressed video sources are not preferred for high quality editing. An early application of SONET private networks was in California to link the motion picture industry companies. What network service was used, based upon bandwidth needs?