Serial Digital Interface Cable; 75 Ohm Coax
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Serial digital interface [SDI] standard is based on a 270 Mbps
transfer rate, over a single 75 ohm coaxial cable [BNC connector], up to
600 feet. Serial Digital Interface is a [standard definition] digital
broadcast television standard providing a lossless digital encoding of
standard NTSC and PAL formats [with embedded audio]. SDI is used in
Television stations, cable channels, and professional production
Equipment. SDI provides a method for transmitting uncompressed digital
video, audio and other data between video devices. SDI is described in ITU R BT 601 standard for interface of component digital video. SDI is defined in SMPTE259M and ITU-R BT.656 standards. SMPTE259M defines four standard bit rates from 143Mbps to 360Mbps [ 270Mps is common]. SMPTE 344M adds a 540Mbps bit rate. One component of luminance (with 720 samples per line), and two of color (each with 360 samples per line). There are either 10 or 8 bits per sample [scrambled, polarity independent interface, with common scrambling for both component ITU-R 601 and composite digital video and four channels of (embedded) digital audio]. The SDI bitstream is encoded using a pseudo-random scramble followed by a a NRZ-to NRZI conversion. The scramble code is x9+ x4+1. The original 8-bit SDI format was based on CCIR-601, the new 10-bit version is called SDTI [Serial Digital Transport Interface. Serial digital data interface (SDDI) is a way of compressing digital video for use on SDI-based equipment from Sony. SDDI is now incorporated into Serial digital transport interface. |
NTSC [National Television System Committee] is used in US [and
Japan]
PAL [Phase Alternation by Line] is used outside the US
.... M-PAL [Phase Alternation by Line] is used outside the US
[Brazil]
.... N-PAL [Phase Alternation by Line] is used outside the
US
SECAM [Sequential Color with Memory] is used outside the US
[France/Russia/Africa]
Engineering Design Key words: Video Cable Bus, DVI, Electrical Standard, Interface Standard, Specification, Spec, Electrical Interface, Semiconductor IC manufacturers, Physical Interface, Engineering Description, electrical characteristics, PC Video Buses, Monitor interfaces, Component Manufacturers, RS170, NTSC, PAL, National Television System Committee.
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