CSS-MO-F-3.2-12 CS11-M Manual Communications Line Switch Options

This document describes the CS11-M Manual Communications Line Switch Options, a product offered by Digital Equipment Corporation's Computer Special Systems.

Key aspects of the document and the CS11-M switches:

1. Purpose: The CS11 family of manual switches provides facilities for switching communication lines from one set of communication interfaces to another. They are particularly useful in multiprocessor configurations where one computer acts as a backup.
2. Supported Interfaces: The switches are designed for EIA standard RS-232-C, four-wire 20 mA current-loop lines, and BELL TYPE 303 wideband data sets. They support data rates up to 460.8 KB/S for both synchronous and asynchronous lines.
3. Design & Features:
   • They are manually operated and designed for standard 19-inch rack mounting.
   • The system is modular, consisting of various "building block" modules (e.g., CS11-MA/MB, CS11-MC/MD, CS11-ME/MF, CS11-MH/MJ) which offer different channel counts and interface types.
   • A key feature is the use of bifurcated, gold-plated contacts to ensure maximum reliability and minimal signal degradation, especially important for telephone and data line applications.
4. Operation & Programming: The switches are strictly manual, meaning there are no programming procedures associated with them. Operators must physically change switch settings and inform the operating software of any changes.
5. Installation & Maintenance: The document details site considerations, various cable connections specific to each switch option, and checkout/acceptance procedures performed before shipment and during installation. Maintenance involves basic visual checks and troubleshooting by bypassing the switch to isolate problems, with no special tools required.

The document is the 6th printing, copyrighted from 1975 to 1982, with the latest printing date being January 1982.