1 Nominal LRs of the national systems
1.1 Definition of nominal LRs of the national systems
1.2 Traffic-weighted mean values of the distribution of send and
receive loudness ratings, SLRs and RLRs
2
Maximum Send and Receive Loudness Ratings, SLR and RLR
2.1 Values for each direction of transmission
2.2 Difference in transmission loss between the two directions of
transmission in national systems
3
Minimum SLR
4
Determination of nominal Loudness Ratings
5
Sidetone
5.1 General
5.2 Talker’s sidetone STMR
5.3 Listener’s sidetone LSTR
6
Incorporation of PCM digital processes in national extensions
6.1 Effect on national transmission plans
6.2 Transmission loss considerations
Annex A – Evaluation of the nominal differences of loss between the two
directions of transmission
Annex B – Transmission considerations for a 4-wire loop inserted in a 2-wire
circuit
B.1 General
B.2 Attenuation
B.3 Impedance
B.4 Sidetone considerations
Annex C – Examples of values of R and T pads adopted by some administrations