ITU G.120:1998
ITU G.120:1998 Transmission Characteristics Of National Networks Gives transmission performance guidance for national networks forming part of international connections for provision of international telephony services.
Table of Contents
1Scope2References
3ApplicationofITU-TRecommendationsontelephone
performancetonationalnetworks
4Nationaltransmissionplan
5Attenuationdistortion
6Circuitnoise
6.1Noiseinducedbypowerlines
6.2Noisecontributedbytransmissionsystems
6.3Noiseinanational4-wireautomaticexchange
6.4Noiseallocationforanationalsystem
7Erroronthereconstitutedfrequency
8Group-delaydistortion
9Linearcross-talkofcircuits
10Non-lineardistortionofanaloguetransmissionsystems
11Variationsoftransmissionlosswithtime
ANNEXA-Noiseallocationforanationalsystem
A.5Largecountries