1 Scope
2 References
3 Definitions
3.1 Terms defined elsewhere
3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Fundamentals about dB
6.1 Loss and gain
6.2 The letter "p" in "dBmp" and
"dBm0p"
6.3 Correction factors
6.4 Signal-to-noise ratio
6.5 Sound pressure level
7 The use of a reference signal
8 Relationships between the units "dBm","dBr" and
"dBm0"
8.1 General
8.2 The unit "dB"
8.3 The unit "dBm"
8.4 The unit "dBr"
8.5 The unit "dBm0"
8.6 The relationship between dBm, dBr and dBm0
8.7 The unit "dBov"
8.8 Relationship between overload (dBov) and maximum levels (dBm0)
9 The concept of "relative levels"
9.1 General principles
9.2 Circuits and connections
9.3 The speech signal and the dynamic range of the voice channel
9.4 Relative level designations for a digital path
9.5 Relative levels in equipment design, specification and testing
9.6 Relative levels in transmission planning and maintenance
Appendix I – The neper
I.1 Introduction
I.2 Definition of the neper
I.3 Use of the decibel and of the neper
Bibliography