MP00068 DN87 Universal Comm System Front End Jan76

This document is a "Field Maintenance Print Set" for the DN87 Universal Communication System Front End, manufactured by Digital Equipment Corporation. It includes:

1. Table of Contents: Listing various components and their associated print sets, such as Universal Comm. System Front End, EIA Local (Data Only), Integral Modem, Distribution Panel, NPR-Sync Line Control, and Maintenance Panels.
2. Unit Variations: A chart detailing different model configurations for the DN87.
3. Assembly Diagrams & Notes: Detailed diagrams showing the physical layout, cable routing, and component placement for various configurations, including basic async, synchronous, async line expansion, and NPR sync line control expansion. These diagrams include specific notes on installation, cable lengths, and assembly requirements.
4. Wiring and Pinout Information: Detailed tables and schematics for power harnesses, connectors, and internal wiring, often referencing specific drawing numbers and component types.
5. Jumper and Switch Settings: Instructions for configuring jumpers and switches for different functionalities like CSR address and vector values, data set control, and interface options.
6. Parts Lists: Comprehensive lists of parts required for various assemblies, including basic assemblies, power supplies, memory, and specialized modules like modems and bus repeaters.
7. Engineering Specifications: Documents detailing the functionality, connectivity, physical specifications (temperature, speed, distance), and variations of the DF11 Serial Line Signal Conditioning Options, including different operating modes (TTL to EIA, audio frequency shift keyed, 20mA local Teletype loop, optical coupled).
8. Digital Logic Schematics: Detailed circuit diagrams for components like the X-OR & CRC Block Check Option, I/O Bus Control/Data Interface, Memory Control/Data Mixer, Shift Matrix, and PS Register & Decoding.
9. Maintenance and Drawing Directories: Lists of manuals and drawing numbers for maintenance, accessory parts, and general overview.

The document emphasizes that the material is for information purposes only, subject to change, and remains the property of Digital Equipment Corporation, with copyright © 1976.