gtps2m10ACF/SNA Data Communications Reference

Airlines Line Control (ALC) Support through SNA

When accessing non-SNA terminals via an SNA interface, TPF maintains the Application Program Interface (API) for application programs that address physical devices. This is done using either:

Most often the physical device is a terminal addressed via a Logical End Point-Identifier (LEID). These devices also use an Agent Assembly Area (AAA). The NEF/ALCI, AX.25, and XALCI enhancements permit the use of ALC protocols for a select group of non-SNA devices across an SNA interface.

See the ACF, NCP, ALCI General Information for more information about devices supported across these interfaces. These devices are also supported across the AX.25 interface.

Throughout the remainder of this publication, NEF implies either the NEF PRPQ or ALCI feature environments.