1 Nominal LRs of the national systems
1.1 Definition of nominal LRs of the national systems
1.2 Recommended values
2
Nominal overall loss of the international chain
3
LRs and directional effects in a complete connection
3.1 Nominal LRs for each transmission direction
3.2 Traffic-weighted mean values of OLRs
3.3 Difference in transmission loss between the two directions of
transmission
4
Variation in time and effect of circuit noise
4.1 Variations in time
4.2 Effect of circuit noise
5
Practical limits of the OLR between two operators or one operator and
one subscriber
6
Incorporation of PCM digital processes in international connections
6.1 Connections with a digital 4-wire chain extending to the local
exchanges
6.2 Mixed analogue/digital connections
Annex A – Explanations related to Recommendations G.111, G.121, G.122, G.131,
G.134: properties and uses of loudness ratings
A.1 General explanations of loudness rating terms as used in the
G-Series Recommendations
A.2 Psycho-acoustic model for loudness ratings
A.3 Measurement of loudness ratings of telephone sets
A.4 Application of loudness ratings in the Series-G
Recommendations
Annex B – Recommended values and limits of the loudness ratings for circuits in
international connections
Annex C – Translation of LR values into CRE values
References