Bisync
Bisync is a communication protocol used in computer networks to synchronize data between two devices. It was developed by IBM in the 1960s and is often used in mainframe environments. Bisync, also known as Binary Synchronous Communication, is a half-duplex protocol, meaning that data can be transmitted in only one direction at a time. This protocol uses a character-oriented framing technique, where each frame of data is enclosed between special control characters, known as SYN (synchronous idle) and ETX (end of text).
The Bisync protocol operates in three modes: character mode, block mode, and transparent mode. In character
Bisync uses a simple error detection mechanism, known as longitudinal redundancy check (LRC), to ensure data
Bisync has been largely replaced by more modern protocols, such as TCP/IP, but it remains in use