SNA

ALSO CALLED: Systems Network Architecture, IBM SNA, and System Network Architecture
DEFINITION: In IBM's Systems Network Architecture (SNA), a physical unit (PU) identifies a network node that supports communication sessions between logical units (LU). Logical units represent end users. Two logical units that communicate depend on physical connections being established  … 
Definition continues below.

SNA DEFINITION (continued): …  through associated physical units. The network point at each end of a communication that sets up the communication session between logical units is called the system services control point (SSCP). The SSCP sets up its own session with the PU on behalf of the LU-LU session. Typically, a logical unit is a unique connection to an application program. A physical unit is the hardware and routing aspect of a network node. IBM's Virtual Telecommunication Access Method (VTAM) … 
SNA definition sponsored by WhatIs.com, powered by WhatIs.com an online computer dictionary