Binary Synchronous Transmission
2780
3780
bisync

    (Bisynch) An IBM link protocol, developed in
   the 1960 and popular in the 1970s and 1980s.

   Binary Synchronous Transmission has been largely replaced in
   IBM environments with SDLC.  Bisync was developed for
   batch communications between a System 360 computer and the
   IBM 2780 and 3780 Remote Job Entry (RJE) terminals.  It
   supports RJE and on-line terminals in the CICS/VSE
   environment.  It operates with EBCDIC or ASCII character
   sets.  It requires that every message be acknowledged (ACK)
   or negatively acknowledged (NACK) so it has high
   transmission overhead.  It is typically character oriented and
   half-duplex, although some of the bisync protocol flavours
   or dialects support binary transmission and full-duplex
   operation.

   (1997-01-07)