Table of Contents
1Scope
2References
3Abbreviations
4Signallingrates
4.1Datasignallingrates
4.2Signallingratesonline
5Differentiationbetweenuserandnetworkdatasignals
5.1Scrambler
5.2Descrambler
6Interfaces
6.1V.24-typeinterface[3]
6.1.1Listofinterchangecircuits
6.1.2Electricalcharacteristics
6.1.3Operationalrequirements
6.2X24-typeinterface[7]
6.2.1Listofinterchangecircuits
6.2.2Electricalcharacteristics
6.2.3Operationalrequirements
7Start-upprocedure
8Testingfacilities
8.1Testloops
8.1.1Instigationofremoteloop2/2b
8.1.2Instigationofthetype-3loop
8.2Selftests
8.2.1Selftestwiththetype-3loop
8.2.2Selftestwithremoteloop2/2b
9Multiplexing
10Internalmanagement
AppendixI-Functionalblockdiagram
AppendixII-Connectionschematics
AppendixIII-Exampleofimplementationofthetransmission
unit
III.1General
III.2Physicalmodelofthelinetransmission
system
III.3FunctionaldescriptionoftheDCE
III.4FunctionsofTUfunctionalblock
III.4.1Datachannels
III.4.2DCEmanagementchannel
III.4.3Bittiming
III.4.4Octettiming
III.4.5Framealignment
III.4.6Activation
III.4.7Deactivation
III.4.8Powerfeeding
III.4.9Maintenance
III.5Requirementsforalinetransmission
systemusing2B1Qlinecode
III.5.1Linecode
III.5.2Linemodulationrate
III.5.3Clocktolerance
III.5.4Framestructure
III.5.5Frameandmultiframewords
III.5.6FrameoffsetbetweenslaveTU
andmasterTU
III.5.7CLchannel
III.6DCEmanagementchannel
III.6.1Protocolandprocedure
III.6.2Functionsprovided
III.7Equipmentmanagementfunction
III.7.1General
III.7.2Specificfunctionsoftheequipment
managementfunctionwithTU
workinginslavemode
III.7.3Specificfunctionsofequipment
managementfunctionwithTUworking
inmastermode Abstract
Defines necessary functions of a 64, 128 and 144 kbit/s DCE for providing digital leased circuits. Describes interworking with DCE compliant with Recommendation V 38. Also permits this DCE to be used as a remote access to a flexible multiplexer as defined in Recommendation G.797.
