本卷是一系列专著中的第二卷，这些专著将使标准（ANSUEIA 548-1988）更容易理解。本手册旨在作为EDIF参考手册2.0.0版的配套文件，该手册也由EL4出版（ISBN 0-7908-0000-4）。本卷介绍了格式中的连通性概念。以一般方式解释概念；在本卷中，net等结构以斜体显示。每当需要关于某个主题的更多细节时，应在EDIF参考手册中查阅斜体结构。EDIF参考手册包含格式的官方定义，应始终作为权威信息来源。本系列后面的几卷将提供更多的应用指南。

This volume is the second in a series of monographs which will make the standard (ANSUEIA 548-1988) easier to understand. It is intended to be used as a companion to the EDIF Reference Manual Version 2.0.0, which is also published by the EL4 (ISBN 0-7908-0000-4).This volume gives an introduction to the concept of connectivity in the format. Concepts are explained in a general way; constructs, such as net, appear in italics throughout this volume. Whenever more detail is desired about a topic the italicized constructs should be consulted in the EDIF Reference Manual. The EDIF Reference Manual contains the official definition of the format and should always be taken as the authoritative source of information. Further application guides will be provided in later volumes of this series.