Rec. ITU-T P.31 (03/1993) … TRANSMISSION CHARACTERISTICS FOR DIGITAL TELEPHONES
FOREWORD
CONTENTS
INTRODUCTION
1 Sending loudness rating (SLR) and receiving loudness ratings (RLR)
2 Sidetone masking rating (STMR) and listener sidetone rating (LSTR)
3 Sending and receiving sensitivity frequency characteristics for digital telephones
4 Noise characteristics at sending and receiving
5 Distortion characteristics at sending and receiving
6 Out-of-band signals
7 Weighted Terminal Coupling Loss (TCLw)
8 Stability loss
9 Delay
10 Input versus output (amplitude) characteristics
Annex A … Variation of gain with input level