Universal Comm System Front End

This document contains a comprehensive set of engineering diagrams and parts lists for the DN87S Universal Communication System Front End, a PDP-11/40 based communications system. It includes:

• System Overviews and Variations: Detailed coverage of DN87S-AA, AB, and U configurations.
• Assembly and Interconnect Diagrams: Point-to-point wire lists, cabinet wiring, and interface cabling specifications (e.g., Unibus cables, DTE remote harnesses).
• Component Detail: Detailed parts lists with Digital Equipment Corporation part numbers and quantities.
• Configuration and Modification: Information on jumper configurations, bootstrap loaders (BM873), and system setup procedures (including the use of the 861 Power Controller).
• Diagnostic Information: References to various MAINDEC diagnostics (e.g., for DL11, DH11, and DM11 options) required for system checkout and maintenance.