ITU U.12:1993
ITU U.12:1993 Terminal And Transit Control Signalling System For Telex And Similar Services On International Circuits (type D Signalling)
Table of Contents
1Signalconversion2Generalswitchingandsignallingprinciples
3Specificsignallingcharacteristics
AppendixI-Possiblesequencesofnetworkselection
signals
AppendixII-Examplesofnetworkselectionsignals
II.1Firstexample(minimumsequenceofnetwork
selectionsignals)
II.2Secondexample(asequenceofnetworkselection
signalsincludingcloseduser-groupcharacters)
AppendixIII-Through-connectionprocedure
References