SNA Terminology

The following SNA terms appear in the descriptions of the LINE and PTERM statement parameters used to implement SNA support:

A logical unit (LU) is a port through which users access the SNA network. For example, an LU can be a CRT terminal, a device such as a displaywriter, or a program such as CICS or the DC/UCF system. Each LU is a single network addressable unit (NAU) to VTAM.
A session is a logical connection between two LUs. Multiple sessions can exist between two LUs that share a single physical connection. Each session is represented in the DC/UCF environment by a physical terminal element (PTE)/logical terminal element (LTE) pair. DC/UCF treats each session as a local resource.
A conversation is a complete transaction between LUs. A conversation is delineated on a session by a begin bracket and an end bracket. Only one conversation can be allocated to a session at a time.