ITU Q.522:1988
ITU Q.522:1988 Digital Exchange Connections, Signalling And Ancillary Functions
Table of Contents
1General2Connectionsthroughanexchange
2.1General
2.2Basicexchangeconnections
2.3Functionsassociatedwithattributesshownin
Sec.2.2
2.4Bitrateofaconnectionthroughanexchange
2.5Servicesofferedatbitrateslessthan64
kbit/s
2.6Servicesofferedatbitratesgreaterthan64
kbit/s
2.7Modeofestablishment
2.8Bitsequenceindependence
2.9Bitintegrity
2.10Octetsequenceintegrity
2.118kHz(structure)integrity
2.12Bitpatternsgeneratedbytheexchangeinidle
channeltimeslots
2.13Errorperformance
2.14In-callrearrangement
2.15Transmissionperformancecharacteristics
3SignallingandD-channelhandling
3.1General
3.2Signallingassociatedwithexchangeconnections
TypesI-IV
3.3Digitalsubscriberaccess-D-channelandprotocol
handlinglayers1,2and3
3.4User-to-usersignalling
4Ancillaryfunctions
4.1Connectionofancillaryequipment
4.2Digitallygeneratedtonesandfrequencies
4.3Echocontroldevices
5Controlfunctionsassociatedwithcallhandling
5.1Basiccontrolfunctions
5.2ExchangeconnectionsTypesI-IV,generalcontrol
aspects
5.3Controlfunctionsassociatedwithcallsovera
digitalsubscriberaccessviaInterfacesUandV
6Controlfunctionsassociatedwithmaintenanceand
automaticsupervision