ect from their telephone systems. Students and Educators who will supply the workforce with needed telephony expertise in the 21ST Century. Investors in Telecommunications Companies who want to understand the industry and terminology. Bookstore Owners and Managers who offer rows of com- puter books for sale, but few basic books on telephone systems and services. A quick look through the Table of Contents and Index will preview what's in the book SO you can see if it's right for you. For tips on managing telephone systems, services and expenses visit DIgby 4 Group, Inc.'s web site at www.digby4.com. The Telecom Handbook a iii This book is dedicated to my parents, Fern and Bill Coe. Taylor & Francis Taylor & Francis Group http://taylorandfrancis.com THE TELECOM HANDBOOK Table of Contents PART I Telecommunications Systems Chapter 1 - The Telephone Parts Of The Telephone Telephone Functions Depend Upon the System Older Style Telephones Still in Use Labels Color Trivia Expanding the Number of Buttons Ringing How Does The Telephone Work? Digital VS. Analog Telephones The Continued Importance of the Telephone on Your Desk Chapter 2 - Your Business Telephone System - The PBX What is a PBX? Understanding Your Own System What is the Physical Makeup of the PBX? A Look Inside The PBX Cabinet PBX Shelf PBX Circuit Boards Other Components Inside The PBX Cabinet PBX Sizing and Growth How the PBX Works Earlier PBXs and How they Worked The Telecom Handbook a vii THE TELECOM HANDBOOK Telephone System Design (PBX and Key Systems) PBX Functions (Also Called Features) System Features Accessible To The Desktop Telephone Working With A PBX Expense Control Function of the PBXs Typical Differences Between Key Systems and PBXs Wireless Telephones with a PBX PBX Disaster Recovery Planning Chapter 3 - Purchasing a PBX Identifying Your Organization's Requirements Top 10 (+1) Places To Go Wrong When Planning For And Purchasing A New PBX Identifying the Requirements A PBX Request For Proposal (with sample questions) Chapter 4 - Your Call Cente