ITU O.27:1988
ITU O.27:1988 In-station Echo Canceller Test Equipment
Table of Contents
1General2Testmodes
2.1Routinetestmode
2.2Diagnostictestmode
3Operatingprinciples
3.1Methodofaccess
3.2Testingsequences
4Testproceduresandtestrequirements
4.1Routinetestmode
4.2Diagnostictestmode
5Specificationsfortransmissionmeasuringequipment
5.1Signalgenerator
5.2Levelmeter
5.3Randomnoisesource
5.4Echopath
6Calibration
6.1Calibrationofmeasuringequipment
6.2Self-checkofoperationalfunction
7Optionalarrangements
7.1Automatictestfunction
7.2Automaticstartfunction
References