NABTS
Protocol for encoding NAPLPS-encoded teletext pages / From Wikipedia, the free encyclopedia
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NABTS, the North American Broadcast Teletext Specification[1], is a protocol used for encoding NAPLPS-encoded teletext pages, as well as other types of digital data, within the vertical blanking interval (VBI) of an analog video signal. It is standardized under standard EIA-516, and has a rate of 15.6 kbit/s per line of video (with error correction). It was adopted into the international standard CCIR 653 (now ITU-R BT.653) of 1986 as CCIR Teletext System C.[2][3]