| 1. | AT&T Network Router 2500 series User Guide AT amp T 555 025 201 DEFINITY Communications System Network and Data Connectivity CONTENTS ABOUT THIS DOCUMENT xvii PREREQUISITE SKILLS AND KNOWLEDGE xvii DOCUMENT ORGANIZATION xvii HOW TO MAKE COMMENTS ABOUT THIS DOCUMENT xix 1 INTRODUCTION TO CONNECTIVITY 1 1 TRANSMISSION TYPES 1 3 ANALOG TRANSMISSION 1 3 DIGITAL TRANSMISSION 1 3 ANALOG VS DIGITAL 1 5 TRANSMISSION STATES 1 7 VOICE TRANSMISSION 1 7 Entering the Switch 1 7 |
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