ITU G.792:1988
ITU G.792:1988 Characteristics Common To All Transmultiplexing Equipments
Table of Contents
1Codinglaw2SamplingrateofPCMchannels
3AmplitudelimitationofPCMchannels
4Accuracyoftheanaloguevirtualcarriers
5Saturationlevelattheinputoftheanaloguegroup
6Methodsofmeasuringqualityintheaudioband
7Attenuationdistortioninthevoice-frequencyband
asafunctionoffrequency
8Groupdelay
8.1Absolutevalueofthegroupdelay
8.2Group-delaydistortion
9Noise
9.1Idlechannelnoise,withallchannelsidle
9.2Channelnoise,withallchannelsloadedexcept
theonemeasured
9.3Singlefrequencynoiseoutsidetheband
300-3400Hz
9.4IdlenoiseinthePCM-FDMdirectionall
channelsidle
10Inter-modulation
11Totaldistortionincludingquantizingdistortion
12In-bandspurioussignals
13Variationofgainwiththeinputlevel
14Cross-talk
14.1Intelligiblecross-talk
14.2Unintelligiblecross-talk
15Go-to-returncross-talk
16Variationoftheequivalentofthechannelswithin
theFDMassembly
17Adjustmentoftherelationbetweenthecodinglaw
andtheanaloguelevel
18Carrierleakattheanalogueports
19Protectionagainstout-of-bandsignalsatthe
analogueports
19.1Out-of-bandspurioussignalsattheanalogue
output
19.2Cross-talkduetoout-of-bandsignalsatthe
analogueinput
20Protectionandsuppressionofpilots
21Protectionandsuppressionofout-of-bandsignalling
21.1Protectionoftheout-of-bandsignallingchannel
fortransmultiplexersusingsignallingsystemR2
21.2Disturbanceoftelephonechannelsbyout-of-band
signallingfrequencyfortransmultiplexersusing
signallingsystemR2
22Mutualinterferencebetweenpilotsandout-of-band
signalling
23Shortandlong-termvariationoflosswithtime
ANNEXAOut-of-bandsignallingsystemsusinga
burst-modemethod
References