DSH80 Option Installation & Owner's Manual

This document is the Installation and Owner's Manual for the DSH80 Synchronous/Asynchronous Option for the Digital Equipment Corporation DECsystem 5100. It is intended for Digital service representatives and qualified self-maintenance personnel for installing, configuring, and diagnosing the DSH80, while also providing customers with information on its protocols, cabling, and power-up self-tests.

Key features of the DSH80 Option:

• It's a communications controller supporting HDLC and SDLC protocols.

• It consists of two modules:

  • Sync Module One: Contains one synchronous line (50-pin D-sub) and four DEC-423-compatible asynchronous lines (MMJ connectors).
  • Sync Module Two: Contains one synchronous line (50-pin D-sub).

• In total, it provides two synchronous and four asynchronous serial communication lines.

System Requirements and Connectivity:

• Requires ULTRIX 4.2 and DECnet Phase V (V2.0 WAN device driver).
• Asynchronous ports support baud rates from 300 to 9600 (higher with alternate clocks).
• Synchronous ports (50-pin) require specific adapter cables to connect to various standards like EIA-232-E, V.28/V.24, EIA-423A, V.10, EIA-422A, V.11, and V.35.

Installation Procedure (for qualified personnel only): The manual provides a detailed, step-by-step process which includes:

1. Shutting down the system and removing the DECsystem 5100 cover.
2. Removing the existing DHT80 option (if present) or blank cover plates.
3. Removing the upper and lower drive shelves.
4. Adding standoffs and connecting internal 100-way and 50-way ribbon cables.
5. Trimming specific standoffs for proper fit.
6. Installing Sync Module One, then Sync Module Two, and connecting them.
7. Adding appropriate labels to the newly installed ports.
8. Replacing the system cover. (It also includes instructions for removing a faulty DSH80 option).

Advanced Diagnostics (for qualified personnel only):

• Describes power-up self-tests and how to interpret successful or unsuccessful results (e.g., ?40 indicating a DSH80 failure).
• Explains how to configure the system to recognize the DSH80 by setting the iooption environment variable to 0x3.
• Provides commands for testing synchronous and asynchronous lines, both together and separately, using internal or external loopback connectors.

Appendices offer crucial supporting details:

• Appendix A: Lists Field-Replaceable Units (FRUs) for the DSH80 option with part numbers.
• Appendix B: Provides specifications for cable lengths and order numbers for various communication protocols.
• Appendix C: Details connectors (D-sub, MMJ), pinouts, synchronous line adapter cables, extension cables, and loopback devices.
• Appendix D: Outlines specific compliance and safety warnings for installations in the United Kingdom.