S, protocol> (TAP, or "IXO", "PET") A protocol for Submitting requeStS to a pagerService. IXO/TAP iS an ASCII-baSed, half-duplexprotocol that allowS the SubmiSSion of a numeric or alphanumeric meSSage. {ExampleS, protocol deScription, clarificationS (ftp://mirror.lcS.mit.edu/telecom-archiveS/technical)}. See alSo RFC 1568. (1996-04-07)