CONTENTS

 Scope
 1     Principles
 2     References
 3     Definitions and conventions
        3.1     Circuits and connections
        3.2     Transmission Reference Point (TRP)
        3.3     Relative (power) level
        3.4     dBm0
        3.5     Power handling capacity
        3.6     Relation between send loudness ratings and relative levels
        3.7     Determination of relative level
        3.8     Relative level of a point in a digital link
        3.9     PCM Digital Reference Sequence (DRS)
       3.10     Subdivision of telephone networks with regard to the interfaces between network operators
 4     Typical network components and configurations
        4.1     Network components
        4.2     Network configurations
 5     Stability control by loss allocation to circuits
 6     Echo control strategies
 7     Consideration of total transmission time
 8     The effect of coding and signal processing in the digital path
 9     Channel compression techniques
10     Evaluation of impairments, singly and in combination
11     Transmission planning in the context of general network planning
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
Appendix I  –  A computational model for guidance in transmission planning
        I.1     Introduction
        I.2     The structure and basic algorithms of the E-model
        I.3     Detailed description of the algorithms
        I.4     Sources used in the E-model for evaluation of impairments and the expectation factor