Local Area Transport (LAT) Architecture

This document serves as the primary technical reference for managing Local Area Transport (LAT) networks, which are used to connect terminal servers and service nodes across Ethernet local area networks. It covers the following key areas:

• Architectural Overview: Explains the layered structure of the LAT protocol, including the Virtual Circuit layer and the Slot layer, and how they function to provide efficient, reliable terminal connectivity.
• Configuration Guidelines: Details the essential control parameters for service nodes and terminal servers, such as circuit timers, keepalive timers, group codes, and datagram/slot sizes.
• Performance Issues: Discusses the impact of various configuration settings on response time, throughput, and Ethernet bandwidth utilization, offering best practices for optimizing performance.
• Troubleshooting: Provides procedures for diagnosing network issues using LAT counters, loopback testing, and remote console facilities (RCF).

The guide is specifically intended for network managers but also provides relevant information for system and server managers.