ITU Q.45:1984
ITU Q.45:1984 Transmission Characteristics Of An Analogue International Exchange
Table of Contents
1Introduction2Definitions
2.1Definitionofaconnectionthroughanexchange
2.2Definitionofswitchingequipmentinputand
outputpoints
2.3Definitionofthenetswitchingloss
3Recommendationsconcerningtransmissionloss
3.1Netswitchingloss
3.2Lossdispersion
3.3Non-lineardistortion
3.4Loss-frequencydistortionreferredto800Hz
4Cross-talkrecommendations
4.3GOtoRETURNcross-talkofthesamepath
(betweenpointsAandD)
5Noiserecommendations
5.1Meannoisepowerduringthebusy-hour
5.2Impulsivenoiseduringthebusy-hour
6Othertransmissionrecommendations
6.1Inter-modulationproducts(measuredatAandD)
6.2Groupdelaydistortion(measuredbetweenAandD)
6.3Returnloss(measuredatAandD,fromAtowards
DandfromDtowardsA)
6.4Impedanceunbalancetoearth
7UseofcablesspecifiedbytheIEC
References