IBM LU6.2

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Logical Unit 6.2 is an IBM-originated communications protocol dating from 1974, associated with IBM's Systems Network Architecture.

A device-independent SNA protocol, it is used for peer-to-peer communications between two systems, for example, between a computer and a device (eg terminal or printer), or between computers. LU6.2 is used by IBM's CICS Intersystem Communications (CICS ISC). APPC is the protocol used with LU6.2 architecture.

LU6.2-compliant devices operate as peers within the network and can perform multiple simultaneous transactions over the network. LU6.2 devices can also detect and correct errors. The LU6.2 definition provides a common API for communicating with and controlling compliant devices. APPC is often used to refer to the LU6.2 architecture or to specific LU6.2 features.

Contrast to LU0, LU2, LU3.