DECnet-20 System Manager's and

This document is a technical guide for system managers and operators responsible for the operational, control, and monitoring functions of DECnet-20 Version 3.0 on DECSYSTEM-2040S/2060 computers. It covers the DIGITAL Network Architecture (DNA) model, startup and restart procedures for the DECnet-20 network, and provides a tutorial on the Network Control Program (NCP) command language. Additionally, it details commands for monitoring network activity, using the SPEAR diagnostic program, and describes the Packetnet System Interface (PSI) for accessing Public Packet Switching Networks (PPSNs), including specific X.25 configurations and X.29 terminal access.