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Asynchronous Serial Interface, or ASI, is streaming data format which often carries an MPEG Transport Stream .

An ASI signal can carry one or multiple SD, HD or audio programs that are already compressed, not like an uncompressed SD-SDI (270Mbs) or HD-SDI (1.45Gbs. An ASI signal can be at varying transmission speeds and is completely dependent on the users setup requirements. For example, an ATSC (US Digital Standard for Broadcasting) has a maximum bandwidth of 19.392658 Mbps. Generally, the ASI signal is the final product of video compression, either MPEG2 or MPEG4, ready for transmission to a transmitter or microwave system or other device. Sometimes it is also converted to fiber, RF or SMPTE310 for other types of transmission. There are two transmission formats commonly used by the ASI interface, the 188 byte format and the 204 byte format. The 188 byte format is the more common ASI transport stream. When optional Reed-Solomon error correction data is included the packet can stretch an extra 16 bytes to 204 bytes total.

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