The ARTS/DRTS-201, housed in a 1RU frame, provides automatic detection of video on both the A and B inputs, guaranteeing fail-safe switching of video, audio and GPI from one input to the other. The ARTS-201 system consists of a single 2x1 analog video channel, four 2x1 analog audio channels and 5 lines for GPI. The DRTS-201 system consists of a single 2x1 SDI digital video channel, four 2x1 AES audio channels and 5 lines for GPI. Space is provided for dual power supplies to ensure redundant operation. The video inputs and outputs are provided by standard BNC connectors. The audio inputs and outputs are provided by Weco connectors, simplifying interconnection of audio signals. Video presence LED’s are mounted on the front panel. The analog video presence detector checks for vertical sync, and will immediately switch video, audio channels and GPI lines from the On-Line input to the Off-Line input. The digital video detector checks for end-of-active-video. LED’s are also provided to indicate whether input A or B is On-Line, and whether the unit is in automatic operation or manual operation mode. The changeover can also be accomplished either by a manual push-button on the front panel, or by an external GPI connector. The external connector can also report power supply health and A-B On-Line indications to an external device.