Table of Contents
1Introduction
2References
3FundamentalsaboutdB
3.1Lossandgain
3.2Theletter"p"in"dBmp"and"dBm0p"
3.3Correctionfactors
3.3.1Sendingatestsignal
3.3.2Receivingatestsignal
3.4Signal-to-noiseratio
3.5Soundpressurelevel
4Theuseofareferencesignal
5Relationsbetweentheunits"dBm","dBr"and"dBm0"
5.1General
5.2Theunit"dB"
5.3Theunit"dBm"
5.4Theunit"dBr"
5.5Theunit"dBm0"
5.6TherelationshipbetweendBm,dBranddBm0
5.7Theunit"dBov"
5.8Relationbetweenoverload(dBov)andmaximumlevels
(dBm0)
6Theconceptof"relativelevels"
6.1Generalprinciples
6.2Circuitsandconnections
6.3Thespeechsignalandthedynamicrangeofthe
voicechanting
6.4Relativeleveldesignationsforadigitalpath
6.5Relativelevelsinequipmentdesign,specification
andtesting
6.5.1Analogueequipment
6.5.2Codecsanddigitalpads
6.5.3Relativelevelofapointinadigitallink
6.5.4Digitalexchanges
6.6Relativelevelsintransmissionplanningandmaintenance
AppendixI-Theneper
I.1Introduction
I.2Definitionoftheneper
I.3UseofthedecibelandoftheNeper Abstract
Provides the definition for different logarithmic power level measurement units in current use in telecommunication systems. It also provides the relationship amongst those units and usage.
