The serial digital interface uses BNC connectors which have a nominal impedance of 75 ohms. Using the SDI standard allows sending 270 Mbit/s signal over 300 meters without a repeater. For HD shorter length is allowed, typically 100 meters.
For HDTV (HD) applications, the serial digital interface defines by SMPTE 292M. Two-bit rates are at 1.485 Gbit/s, and 1.485/1.001 Gbit/s. The factor of 1/1.001 is provided to allow SMPTE 292M to support video formats with frame rates of 59.94 Hz, 29.97 Hz, and 23.98 Hz, to be compatible with existing NTSC systems. The 1.485 Gbit/s version of the standard supports other frame rates in widespread use, including 60 Hz, 50 Hz, 30 Hz, 25 Hz, and 24 Hz. It is common to collectively refer to both standards using a nominal bit rate of 1.5 Gbit/s.
SMPTE standardizes a nominal 3 Gbit/s (3G) interface (more accurately, 2.97 Gbit/s, but commonly referred to as "3 gig"); as of June 2006, chipsets for this interface are just becoming available. It is intended to support all of the features supported by the dual 1.485 Gbit/s interface but requires only one cable rather than two.
For standard definition (SD) applications, as defined by SMPTE 259M, the possible bit rates are 270 Mbit/s, 360 Mbit/s, 143 Mbit/s, and 177 Mbit/s. 270 Mbit/s is by far the most commonly used; though the 360 Mbit/s interface (used for widescreen standard definition) encounters. The 143 and 177 Mbit/s interfaces were intended for transmission of composite-encoded (NTSC or PAL) video digitally, and are now considered obsolete.
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