Committees responsible
Foreword
1 Scope
2 References
3 Abbreviations and definitions
4 General
5 TE on-line (non-signalling state)
6 Speech transmission process
7 TE with facility for suppressing transmission
8 Call control
9 Conformity principles
Annexes
A (normative) General
B (normative) Methods of test
C (informative) Information required for type testing
D (normative) Procedure for conditioning carbon microphones
E (informative) Information for test purposes
F (informative) Telephony for elderly and disabled
people
Tables
1 Coordination of voltage limit curve for d.c.
characteristics
2 Coordinates of sending sensitivity limit curves
3 Coordinates of receiving sensitivity limit curves
4 Coordinates of sending loudness rating limit curves for
line lengths up to 7.5 km
5 Coordinates of receiving loudness rating limit curves
for line lengths up to 7.5 km
B.1 Parameters required to calculate SLR, STMR and RLR
E.1 General information
E.2 Options list
E.3 Features implementation
Figures
1 D.C characteristics lower limit
2 Sending sensitivity limits for line lengths of 0 km
3 Sending sensitivity limits for line lengths over 0 km
and up to 3 km
4 Sending sensitivity limits for line lengths over 3 km
and up to 7.5 km
5 Receiving sensitivity limits for line lengths of 0 km
6 Receiving sensitivity limits for line lengths over 0 km
and up to 3 km
7 Receiving sensitivity limits for line lengths over 3 km
and up to 7.5 km
8 Sending loudness rating limits
A.1 Limits of ambient noise for speech transmission tests
B.1 The local telephone system (LTS)
B.2 Artificial line segment 0.1 km length
B.3 Feeding bridge
B.4 Circuit for measurement of signal levels
B.5 Circuit for instability test
B.6 Handset position for instability test
List of references