ITU G.243:1988
ITU G.243:1988 Protection Of Pilots And Additional Measuring Frequencies At Points Where There Is A Through-connection
Table of Contents
1Interconnectionoftelephonecircuitsataudiofrequency
2Through-groupconnection
2.1Grouproutedonasuper-groupequippedwithpilots
411.860and411.920kHz
2.2Grouproutedonasuper-groupequippedwithpilot
547.920kHz
3Through-super-groupconnection
3.1Protectionofaline-regulatingpilotagainst
additionalmeasuringfrequencies
3.2Protectionofadditionalmeasuringfrequencies
3.3Protectionofthemaster-groupor15-supergroup
pilotagainstadditionalmeasuringfrequencies
4Endofasupermaster-grouplink
5Directthrough-connection
5.1Precautionstobetakenintheuseofpilotsignals
andadditionalmeasuringfrequencieswherethereis
direct
5.2Precautionstobetakenatadirect
through-connectionpointattheendofa
regulated-linesection
References