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Foreword
Power Networks
Best in class
Voice communication
Intended Audience
1 Introduction
1.1 Short History of the Telephone
2 The Telephone
2.1 Key Voice Fundamentals
2.1.1 Frequency
2.1.2 Levels
2.2 Basic Operation of the Telephone
2.2.1 Basic Telephone - Signalling
2.2.2 Basic Telephone - The Speech Path
2.3 Other Types of Telephone
2.3.1 “Two wire” Vs. “Four wire”
3 The PBX
3.1 Introduction to the PBX
3.2 Call Routing in a PBX
3.3 Voice Interfaces on a PBX
4 Introduction to Digital Voice
4.1 The Channel Bank
4.2 Digital Voice - Pulse Code Modulation (PCM) - G.711
4.2.1 A-law and µ- PCM
µµ
µ Α
µ
4.2.2 Power of a Digital Signal
µ Α
µ
4.2.3 Distortion Resulting from the Digitisation Process