DECserver 300 Technical Description

This document is the DECserver 300 Technical Description manual, published by Digital Equipment Corporation in August 1989.

Purpose: It provides a comprehensive functional description of the DECserver 300, explaining how its system software, firmware, and hardware components interact to perform server functions.

Key Content Areas:

1. System Overview: Introduces the DECserver 300 as a terminal server, its role in Local Area Transport (LAT) networks, and its main components (hardware, ROM-based firmware, server software).
2. Hardware: Details specifications (physical, environmental, electrical), controls, indicators, connectors (Ethernet and 16 asynchronous serial ports), cables, and lists supported devices (terminals, PCs, printers).
3. Hardware Functional Description: Explains the internal workings of subsystems like the CPU, Dynamic RAM (DRAM), peripheral devices, data path arbitrator, network interface, and initialization logic.
4. Software Functional Operation: Describes the various software components, including the user interface handler, Maintenance Operation Protocol (MOP) handler, Local Area Transport (LAT) protocol handler, Ethernet driver, port driver, and initialization routines, with an example of data flow.
5. Firmware Functional Operation: Covers the self-test routines (normal, manufacturing, console, and server entry modes, including error reporting), MOP functions (down-line load, up-line dump, remote console), and repair/debug utilities.

Intended Audience: This manual is designed as a resource for training, field service, and manufacturing personnel, assuming a basic knowledge of Ethernet local area networks.