CONTENTS

 1     Introduction
 2     Scope
 3     References
 4     Abbreviations
 5     Voiceband data performance
        5.1     Test Set-up Architecture
        5.2     Impairments
        5.3     Measurement Procedures
        5.4     Transmit and echo levels
        5.5     Performance measurements
        6.6     Calibration
 6     Narrow-band signal performance
        6.1     System No. 5 inter-register signalling
        6.2     R-2 Signalling
        6.3     DTMF Signals
        6.4     System No. 5 line signalling
        6.5     Circuit Continuity Tones
        6.6     Echo canceller disabling tone
        6.7     Distortion, frequency and level
 7     Coding delay
        7.1     Total delay measurement method
 8     Convergence time
        8.1     Encoder/decoder decorrelation
        8.2     Encoder/decoder state mismatch
        8.3     Attack time
        8.4     Measurement method
 9     Facsimile performance
Bibliography