Table of Contents
1Scope
2References
3Termsanddefinitions
3.1ALCdevice
3.2DisabledALCdevice
3.3Echocanceller
3.4FullALCdevice
3.5Fullechocanceller
3.6Laboratorytests
3.7Targetlevel
4Abbreviationsandacronyms
5CharacteristicsofALCdevices
5.1General
5.2ALCcharacteristics
5.3Tandemedoperation
5.4Delayperformance
6Testsignals
6.1Testsignalforlevelandgainchecks
6.2Electricalcircuitnoise
6.3Environmentalnoise
7Tests
7.1Stability
7.2Echo
TestA(forconnectionswithoutechocontrol)
TestB(forconnectionswithechocontrol)
7.3Noisetolerance
TestA(robustnesstocircuitnoise)
TestB(robustnesstoenvironmentalnoise)
7.4Signallingtones
7.5Voice-banddataandfacsimiletransmission
Testprocedure
ANNEXAGuidanceformeasuringsignallevelsinnetworks
APPENDIXIGuidanceforthedesignofAutomaticLevel
Control(ALC)algorithmsandtheirplacement
inthePSTN
I.1Introduction
I.2Discussion
I.3ALCconsiderations
APPENDIXIIConsiderationsrelatingtoALCdeployment
II.1LocationofALC
II.2Tandemedoperation Abstract
Applicable to testing of Automatic Level Control devices meant to be used in digital network-based equipment. Not applicable to subscriber-based level control devices, devices operative in the analogue domain or any kind of fixed level control within the network which may be part of an overall network transmission plan. Specifies performance constraints for network ALC devices, and where necessary, for specification of laboratory tests for an ALC device to ascertain that the constraints are complied with.
