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Author: Admin | 2025-04-28
An ASI signal.It is a one-way transmission, similar to RS-232 asynchronous data—a stream of raw but formatted zeros and ones—designed to primarily travel through coaxial cable at speeds that range from 6-200 megabits per second. Though 270 megabits per second is the rate of the underlying available bandwidth, Transport Streams, and therefore ASI transmissions, usually top out at around 200 megabits per second.A Transport Stream, and thereby ASI when over coax, can carry one or multiple SD, HD or audio programs that are already compressed, as opposed to an uncompressed SD-SDI (270 Mbit/s) or HD-SDI (1.485 Gbit/s). An ASI signal can be at varying transmission speeds and is completely dependent on the user's engineering requirements. For example, an ATSC (US digital standard for broadcasting) has a specific bit rate of 19.392658 Mbit/s. Null characters, represented by the ASCII comma, are used to pad the transmission to that rate should the media itself not require the entire bitstream.Generally, the ASI signal is the final product of video and audio compression for distant delivery, internal distribution, or broadcast to the public, as is today's digital television and cable.. Though it is codec agnostic and can carry any kind or data, It most often carries MPEG2 (H.262 video with MPEG-1 Layer II audio) or MPEG4 (H.264 video with MPEG-4 Part 14 audio), ready for transmission to a television or radio broadcast transmitter, microwave system or other device. Sometimes it is also converted to fiber, RF or the "SMPTE 310" format: (a synchronous version
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