1 Scope, purpose, and application
1.1 Scope
1.2 Purpose
1.3 Application
2
Normative references
3
Abbreviations and definitions
3.1 Abbreviations
3.2 Definition
4
Interface requirements
4.1 Electrical interfaces
4.1.1 DS1 digital interface
4.2 TMN data transport interfaces
5
Functional requirements
5.1 Required measurement functions
5.2 Optional functions
6
Description of required measurement functions
6.1 Speech measurements
6.1.1 Speech classification
6.1.2 Active speech level measurement
6.1.3 Speech level measurement interval
6.1.4 Speech activity factor
6.2 Noise measurement
6.2.1 Noise level (psophometric weighting)
6.2.2 Noise level measurement interval
6.2.3 Non-stationary noise classification and
measurement
6.3 Echo measurement
6.3.1 Speech echo path delay measurement
6.3.2 Echo Loss measurement
6.3.3 Echo path loss measurement
6.3.4
Speech echo path loss measurement
7
Description of optional functions
7.1 Originating and terminating address digits
7.2 Facility or circuit identification
7.3 Time and duration of connection
7.4 Signal classification
7.5 Customer identification
7.6 DS1 performance measurements
7.7 3 kHz flat noise level
7.8 Connection disposition measurements
7.9 Data analysis and reports
7.10 Saturation clipping
7.11 Measurement interval
7.12 Double talk
7.13 Front-end clipping
7.14 One-way transmission
7.15 Crosstalk
7.16 Stability loss
7.17 Distortion
8
Requirements for performance of measurements
8.1 Description of different classes
8.1.1 Class A – Local (National for many
countries) networks
8.1.2 Class B – Medium delay networks
8.1.3 Class C –
Long delay networks
8.1.4 Class D – Future networks
8.2 Measurement specification
8.3 Requirements for accuracy
8.4 Description of reference circuits
8.4.1 Reference circuit 1
8.4.2 Reference circuit 2
8.4.3 Reference circuit 3
8.5 Reference measurements
8.5.1 Analogue versus digital measurements
8.5.2 Reference Speech Level (RSL)
8.5.3 Reference Noise Level (RNL)
8.5.4 Reference Speech Activity Factor (RSAF)
8.5.5 Reference Echo Loss (REL)
8.5.6 Reference Echo Path Loss (REPL)
8.5.7 Reference Speech Echo Path Loss (RSEPL)
8.5.8 Reference Speech Echo Path Delay (RSEPD)
9
Test conditions for Class A, B and C devices
9.1 Test design
9.2 Multiple measurements
9.3 Circuit conditions for Class A device
9.4 Circuit conditions for Class B device
9.4.1 Description of test elements
9.4.2 Circuit conditions
9.4.3 Circuit conditions with echo cancellers
9.5 Circuit conditions for Class C device
9.5.1 Description of test elements
9.5.2 Circuit conditions
9.5.3 Circuit conditions with echo cancellers
9.5.4 Circuit conditions with DCME
9.6 Class D – Future networks
Annex A – Speech material
A.1 Parameters
A.1.1 Subjects
A.1.2 Conversations
A.1.3 Language
A.1.4 Duration of conversations
A.1.5 Activity factor of conversations
A.2 Telephone connection
A.3 Source recordings
A.3.1 Recording environment
A.3.2
Recording system
A.3.3 Recording procedure
A.3.4 Speech level
A.3.5 Subjects
A.3.6 Conversation task
A.3.7 Calibration signal
Appendix I – Review of measurement techniques
I.1 Speech echo path delay
I.1.1 Correlation analysis
I.1.2 Adaptive filter analysis
I.2 Verification of delay measurements
I.3 Failure of delay
measurement
Appendix II – Degradation of telephone transmission quality due to
non-stationary noise
II.1 Introduction
II.2 Classification of non-stationary noise
II.2.1 The noise signal database and its
analysis
II.3 Noise classification and measurement algorithm (example)
II.3.1 Main features
II.3.2 Stationarity algorithm
II.3.3 Stationary noise
II.3.4 Non-stationary noise
II.4 Psophometric measure
II.5 Performance evaluation (example)
II.5.1 Analysis of the results
II.6 Conclusion