ITU O.61:1988
ITU O.61:1988 Simple Equipment To Measure Interruptions On Telephone-type Circuits
Table of Contents
1Definitions1.1Interruption
1.2Deadtime
2Thedetector
2.1General
2.2Interruptiondetectionthreshold
2.3Inputconditions
2.4Inputimpedance(frequencyrange300Hzto4kHz)
2.5Deadtime
2.6Auxiliarylogicoutput
2.7Timingclock(optional)
3Thecounter
3.1General
3.2Powerfailure
4Simultaneousmeasurements
5Operatingenvironment