SMPTE 259M is a standard published by SMPTE which "describes a 10-bit serial digital interface operating at 143/270/360 Mb/s."
The goal of SMPTE 259M is to define a serial digital interface (based on a coaxial cable), called SDI or SD-SDI.
There are 4 bit rates defined, which are normally used to transfer the following standard video formats: VariantBit rateAspect ratioTotal lines (per frame)Active pixels (per line)Active linesFrame rateSMPTE 259M-A4:352576848659.94iSMPTE 259M-B4:362594857650iSMPTE 259M-C4:3 or 16:952572048659.94iSMPTE 259M-C4:3 or 16:962572057650iSMPTE 259M-D16:952596048659.94i
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