1
Scope
2
References
3
Terms and definitions
4
Abbreviations and acronyms
5
Characteristics of ALC devices
5.1
General
5.2
ALC characteristics
5.3
Tandemed operation
5.4
Delay performance
6
Test signals
6.1
Test signal for level and gain checks
6.2 Electrical
circuit noise
6.3 Environmental
noise
7 Tests
7.1
Stability
7.2
Echo
7.3
Noise tolerance
7.4
Signalling tones
7.5
Voiceband data and facsimile transmission
7.6
Test to verify the ability of an ALC to estimate the signal level
correctly
7.7
Test to verify the ability of an ALC to operate on short speech
utterances (under study)
Annex A – Guidance for measuring signal levels in networks
Appendix I – Guidance for the design of automatic level control (ALC)
algorithms and their placement in the public switched telephone network
(PSTN)
I.1
Introduction
I.2
Discussion
I.3
ALC considerations
Appendix II – Considerations relating to ALC deployment
II.1
Location of ALC
II.2
Tandemed operation
Bibliography