Table of Contents
FOREWORD
CONTENTS
0Scope
1General
1.1Measurementconsiderations
1.2Portdefinitions
1.3Abbreviations
2Relativelevelsatanalogueports
2.1Relativelevelsat4-wireports(E4)
2.2Relativelevelsat2-wireports(E2)
3Adjustmentofactualrelativelevels
3.1Adjustmentofthedecodingside(TintoEout)
3.2Adjustmentoftheencodingside(EintoTout)
3.3Loadcapacity(overloadpoint)
4Short-andlong-termvariationoflosswithtime
5Nominalimpedanceandreturnlossofanalogueports
5.1Nominalimpedance
5.2Returnloss
6Impedanceunbalanceaboutearth
6.1Longitudinalconversionloss
6.2Longitudinalconversiontransferloss
7Attenuation/frequencydistortion
8Groupdelay
8.1Absolutegroupdelay
8.2Groupdelaydistortionwithfrequency
9Idlechannelnoise
9.1Weightednoise
9.2Singlefrequencyinterference
10Discriminationagainstout-of-bandsignals
10.1Inputsignalsabove4600HzatanalogueportsE4
andE2
10.2Inputsignalsbelow300HzatanalogueportsE4
andE2
10.3Overallrequirement(4-wireonly)
11Spurioussignalsatthechanneloutputport
11.1Spuriousout-of-bandsignalsatthechanneloutput
port
11.1.1In-bandinputsignal
11.1.2Overallrequirement
11.2Spuriousin-bandsignalsatthechanneloutputport
12Totaldistortion,includingquantizingdistortion
13Variationofgainwithinputlevel
14Crosstalk
14.1General
14.2Inter-channelcrosstalk,channelsbetweenanalogue
ports
14.2.1Far-endcrosstalk
14.2.2Go-to-returncrosstalkforchannelsbetween
4-wireanalogueports
14.3Inter-channelcrosstalk,channelsbetweenanalogue
anddigitalports
14.3.1Far-endandnear-endcrosstalkmeasuredwith
analoguetestsignal
14.3.2Go-to-returncrosstalkmeasuredwithanalogue
testsignal
14.3.3Far-endandnear-endcrosstalkmeasuredwith
digitaltestsignal
14.3.4Go-to-returncrosstalkmeasuredwithdigital
testsignal
15Interferencefromsignalling
15.1Channelsbetween4-wireanalogueports
15.2Channelsbetween2-wireanalogueports
15.3Channelsbetween4-wireanalogueanddigitalports
15.4Channelsbetween2-wireanalogueanddigitalports
16Echoandstabilityat2-wireports,E2
16.1TerminalBalanceReturnLoss(TBRL)
16.2StabilityLoss(SL)
APPENDIXI-Alternativemeasurementmethodsusingband
limitednoisesignals
I.1Variationofgainwithinputlevel
I.2Totaldistortion,includingquantizingdistortion
APPENDIXII-Methodofderivationofthesignal-to-total
distortionratiofortheA-law Abstract
Deals with the transmission performance characteristics of PCM channels of digital transmission equipment. Gives requirements to be met between 4-wire and 2-wire analogue ports as well as requirements for analogue-to-digital and digital-to-analogue connections. The specified parameters and values are applicable to the use of PCM equipment connected to analogue trunks or to analogue and digital exchanges.
