Rec. ITU-T G.101 (03/1993) – THE TRANSMISSION PLAN
FOREWORD
CONTENTS
1 Principles
2 Definitions and conventions
    2.1 Circuits and connections
    2.2 transmission reference point (TRP)
    2.3 relative (power level)
    2.4 dBm0
    2.5 Power handling capacity
    2.6 Relation between send loudness ratings and relative levels
    2.7 Determination of relative level
    2.8 Relative level of a point in a digital link
    2.9 PCM Digital Reference Sequence (DRS)
    2.10 The international chain of circuits
    2.11 4-wire chain
    2.12 virtual international connecting points (VICPs)
    2.13 Relative levels specified in the Virtual International Connecting Points
    2.14 circuit access point
    2.15 Measurement frequency
3 Number of circuits in a connection
    3.1 National circuits
    3.2 International circuits
    3.3 Hypothetical reference connections
    3.4 Number of circuits encountered in an international connection
4 Incorporation of unintegrated digital processes
    4.1 General
    4.2 Types of telephone circuits
    4.3 Number of unintegrated PCM digital processes
    4.4 Transmission of analogue and digital data
    4.5 General principle
Annex A – The concepts of relative levels, dBm0, circuits and connections, and their use in transmission planning
A.1 Introduction
A.2 Circuits and connections
A.3 Relative levels
A.4 Digital pads and the designation of relative levels
A.5 Level jumps
A.6 Power handling capacity
A.7 Examples
References