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logical unit[′läj·ə·kəl ′yü·nət]
An abstraction of an input/output device in the form of an additional name given to the device in a computer program.
LU(Logical Unit) In IBM SNA networking, one end of a communications session. The complete LU to LU session is defined by session type. Following are the common types. See SNA.
1 Host to 3770 RJE terminal 2 Host to 3270 mainframe terminal 3 Host to 3270 printer 6.2 Program-to-program 7 Host to 5250 midrange terminal
LU 6.2An SNA protocol that establishes a session between two programs. It allows peer-to-peer communications as well as interaction between programs running in the host with PCs, Macs and midrange computers.
Before LU 6.2, processing was done only in the mainframe. LU 6.2 allows processing to take place at both ends of the communications, necessary for today's distributed computing and client/server environment. See APPC and CPI-C.