1 Introduction
2
Structure
3
Relevant impedances
3.1 Customer and network equipment
3.2 Principal impedances
4
Influence of impedances on principal transmission parameters
4.1 General
4.2 Sidetone ratings (STMR and LSTR)
4.3 Talker echo
4.4 Stability
4.5 Listener echo
4.6 Loss frequency distortion
5
Outline approach to determining values for key impedances
5.1 Scope
5.2 Analogue 2-wire cabling
5.3 Digital local transmission
5.4 Analogue/digital interworking situations