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]
- ^ Astle, B. (September 1983). RCA Engineer – Teletext standards in North America (PDF). RCA Corporation. p. 15.
- ^ "Recommendation ITU-R BT.653-3 (02/1998) Teletext systems" (PDF). itu.int.
- ^ "Norpak – TES3/NABTS". October 10, 2006. Archived from the original on 10 October 2006.