Local Area Transport (LAT) Network Concepts

This document provides a comprehensive overview of the Local Area Transport (LAT) architecture and its implementation within Ethernet local area networks (LANs). It details the concepts behind LAT, which allows terminal users to access various computing resources, such as multiuser computers, printers, and modems, across a network.

Key topics covered include:

• LAT Components: Definitions of terminal servers and service nodes, including general-purpose and dual-purpose servers.
• LAT Architecture: A layered model comprising the Service Class, Slot, and Virtual Circuit layers, and how these relate to the underlying Ethernet and DNA layers.
• Communications Processes: Detailed descriptions of service announcements, session establishment, session management, virtual circuit maintenance, and handling host-initiated requests.
• Network Management: Guidance for server, system, and network managers on planning configurations, installing software, managing connection queues, and customizing serverwide and port characteristics.
• Integration: Information on how LAT is implemented on systems like VAX/VMS, including specific software modules and tools like the Terminal Server Manager (TSM).

The document is intended for network, system, and server managers who need to understand the operation and administration of LAT networks.