1 Scope, purpose, and application
1.1 Scope
1.2 Purpose
1.3 Application
2 References
3 Abbreviations and definitions
3.1 Abbreviations
3.2 Definition
4 Interface requirements
4.1 Electrical interfaces for class A,
B and C INMDs
4.1.1 DS1 digital interface
4.2 TMN data transport interfaces for
class A, B and C INMDs
4.3 Interfaces for class D INMDs
4.4 Reconstruction of signal for class
D INMDs
4.4.1 The de-jitter buffer
4.4.2 The voice decoder
4.4.3 The comfort noise generation
4.4.4 The error concealment process
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
6.4 IP protocol measurements
6.4.1 IP delay variation measurement
6.4.2 IP packet loss ratio 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
7.18 Single-ended speech quality
7.19 IP round-trip delay
7.20 IP one-way connectivity
7.21 Out-of-order IP packets
7.22 IP packets loss pattern
7.23 Type and configuration of voice coder
7.24 Quantity of transmitted data in IP
packets
7.25 Packet Arrival Descriptors
8 Requirements for performance of
measurements
8.1 Description of different classes
8.1.1 Class A – Local (National for many countries)
circuit switched networks
8.1.2 Class B – Medium-delay circuit switched networks
8.1.3 Class C – Long-delay circuit switched networks
8.1.4 Class D – Packet switched 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
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
Bibliography