Rec. ITU-T G-Suppl�ment 29 (11/1988) - OBJECTIVE FOR THE MIXED ANALOGUE/DIGITAL CHAIN OF 4-WIRE CIRCUITS
1 General
2 Structure of a mixed analogue/digital voice frequence chain of 4-wire circuit
3 Objectives for parameters of mixed analogue/digital circuits
    3.1
    3.2
    3.3 Unbalance loss in respect to earth
    3.4 Nominal relative level
    3.5 Variations of transmission loss with time
    3.6 Attenuation/frequency distortion
    3.7 Group delay distortions
    3.8 Intelligible crosstalk
    3.9 Non-linear distortions
    3.10 Noise (total distortions)
    3.11 Single tone interference
    3.12 Products of unwanted modulation
    3.13 Impulse noise
    3.14 Short-time interruptions, phase jitter, amplitude and phase hits
    3.15 Error performance
References
ANNEX A
ANNEX B
B.1 Introduction
B.2 Influence of digital circuit errors on impulse noise in an idle voice-frequency PCM channel