Synchronous Serial Interface for MPEG-2 Digital Transport Stream

The standard SMPTE 310M is a television standard by the Society of Motion Picture and Television Engineers, describing a synchronous serial interface for MPEG-2 digital transport streams. These digitally transmitted MPEG-2 transport streams have a bandwidth of 19.38 Mbps or 38.8 Mbps and they are used to feed modulators that create the RF signals. SMPTE 310M specifies a very accurate 2.5 ppm clock.
Usually the SMPTE 310M stream is composed of a 12Mbps HD stream (1080i) and a 6Mbps SD stream (640i). Cabling: 75 Ohm coax cable with BNC connector.

MPEG-2 data streams can be in the DVB-ASI format or the SMPTE 310M format. The SMPTE-310M was originally developed for point-to-point low noise transmission within the studio and has a transfer rate of 19.39 Mbps whereas DVB-ASI was developed for transport over longer distances (with acceptable higher noise rates) with a much higher payload.