This standard describes the physical interface and modulation characteristics for a synchronous serial interface to carry MPEG-2 transport bit streams at rates up to 40 Mb/s. It is a point-to-point interface intended for use in a low-noise environment. The low-noise environment is defined as a noise level that would corrupt no more than one MPEG-2 data packet per day at the transport clock rate. When other transmission systems (e.g., studio-to-transmitter microwave links, etc.) are interposed between devices employing this interface, higher noise levels may be encountered. In such cases, it is recommended that appropriate error correcting methods be used.