A practical, applied reference on T1 data transport, this text aims to help those navigating a 40-year-old technology originally designed for AT&T's voice network. This book brings together the knowledge needed to set up, test and troubleshoot T1. It covers the following broad topics: what components are needed to build a T1 line and how those components interact to transmit data effectively; how to use standardized link layer protocols to adapt the T1 physical layer to work with data networks; and how to troubleshoot problems and work with the telephone company, equipment manufacturers, and Internet service providers.