ITU G.111:1993
ITU G.111:1993 Loudness Ratings (lrs) In An International Connection
Table of Contents
1NominalLRsofthenationalsystems1.1DefinitionofnominalLRsofthenationalsystems
1.2Recommendedvalues
2Nominaloveralllossoftheinternationalchain
3LRsanddirectionaleffectsinacompleteconnection
3.1NominalLRsforeachtransmissiondirection
3.2Traffic-weightedmeanvaluesofOLRs
3.3Differenceintransmissionlossbetweenthetwo
directionsoftransmission
4Variationintimeandeffectofcircuitnoise
4.1Variationsintime
4.2Effectofcircuitnoise
5PracticallimitsoftheOLRbetweentwooperatorsor
oneoperatorandonesubscriber
6IncorporationofPCMdigitalprocessesininternational
connections
6.1Connectionswithadigital4-wirechainextending
tothelocalexchanges
6.2Mixedanalogue/digitalconnections
AnnexAExplanationsrelatedtoRecommendationsG.111,
G.121,G.122,G.131,G.134:propertiesanduses
ofloudnessratings
A.1Generalexplanationsofloudnessratingterms
asusedintheG-SeriesRecommendations
A.2Psycho-acousticmodelforloudnessratings
A.3Measurementofloudnessratingsoftelephonesets
A.4ApplicationofloudnessratingsintheSeries-G
Recommendations
AnnexBRecommendedvaluesandlimitsoftheloudness
ratingsforcircuitsininternationalconnections
AnnexCTranslationofLRvaluesintoCREvalues
References