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ABOUT THIS DOCUMENT
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This document explains how to arrange two or more communications systems in a network. It also tells
how to use your communications system to connect one data communications device or network to another
device or network.
This document is for AT&T sales teams and customers who are responsible for:
• Designing telecommunications networks
• Interfacing data processing devices or networks through a communications system
PREREQUISITE SKILLS AND KNOWLEDGE
To use this document, you should be familiar with the communications systems you intend to include in the
network. The following documents describe AT&T communications systems:
• An Introduction to AT&T DEFINITY 75/85 Communication System Generic 1 (555-200-024)
• An Introduction to DEFINITY 75/85 Communications System Generic 2 (555-104-020)
• AT&T DEFINITY 75/85 Communication System Generic 1 System Description (555-204-200)
• DEFINITY Communications System Generic 2 and System 85 System Description (555-104-201)
• DIMENSION System Description and Planning (554-111-100)
For network implementation particulars, you may also find the following documents helpful:
• AT&T DEFINITY 75/85 Communications System Generic 1.1 Implementation (555-204-654)
• DEFINITY Communications System Generic 2 and System 85 Feature Descriptions (555-104-301)
• AT&T DEFINITY 75/85 Communications System Generic 1 and System 75 and System 75 XE Feature
Descriptions (555-200-201)
Appendix A, Related Documents, lists the names of other documents you may need to refer to for more
detailed information.
DOCUMENT ORGANIZATION
This document has two major sections: Part I covers communications system networking, and Part II
describes data connectivity. The document contains the following chapters.
• Chapter 1 — Introduction to Connectivity — Explains concepts and devices that are common to both
the communications system networking and the data connectivity sections of the manual. These areas
of shared interest include: transmission types, transmission states, multiplexing, and trunking.
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