�1����
Scope�
�2���� References
�3���� Definitions and abbreviations���
������� 3.1���� Definitions��������
������� 3.2���� Abbreviations�����
�4���� Sending Loudness Rating (SLR) and
receiving Loudness Ratings (RLR)�������
�5���� Sidetone Masking Rating (STMR) and
Listener Sidetone Rating (LSTR)������
�6���� Sending and receiving frequency
responses�����
�7���� Noise characteristics at sending
and receiving��
�8���� Distortion characteristics at
sending and receiving������
������� 8.1���� Method 1 (Noise method)��������
������� 8.2��� �Method 2 (Sinewave method)����
�9���� Out-of-band signals�����
������� 9.1���� Sending�
������� 9.2���� Receiving�
10���� Weighted Terminal Coupling Loss (TCLw)����
11���� Stability loss�
12���� Delay
13���� Input versus output (amplitude) characteristics��������
Annex A � Variation
of gain with input level����
������� A.1���� Sending direction
������� A.2���� Receiving direction�������
Annex B � Objective
measurement methods for testing����
������� B.1���� Introduction������
������� B.2���� Approaches for testing digital telephones��������
������� B.3���� Definition of 0 dB reference point�������
������� B.4���� Definition of interfaces��
������� B.5���� Codec specification�������
������� B.6���� Measurement of digital telephone
transmission characteristics�
Annex C � Distortion
allowances�� ��
Annex D � Test
equipment requirements����
������� D.1���� Electro-acoustic equipment������
������� D.2���� Test signals�������
������� D.3���� Accuracy of test equipment�����
Appendix
I � Bibliography����