BS 6789-2:1984
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Apparatus with one or more particular functions for connection to public switched telephone networks run by certain public telecommunications operators Specification for apparatus with loudspeaking facilities
Hardcopy , PDF
02-08-2013
English
30-03-1984
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Foreword
Committees responsible
Specification
Section one. General
1. Scope
2. Abbreviations, definitions and notation
3. General requirements and test conditions
4. Information to be provided by the supplier
5. Electrical network connection methods
Section two. Electrical characteristics of apparatus
6. Apparatus on-line (non-signalling state)
7. Speech transmission process
Appendices
A. General conditions of test
B. Methods of test
Tables
1. Coordinates of voltage limit curves for d.c.
characteristics
2. Limits of sending sensitivity for line lengths up
to and including 3 km
3. Limits of sending sensitivity for line lengths in
the range over 3 km to 7.5 km
4. Limits of noise levels for noise criterion curve
NC 15
5. Data required to calculate Z
6. Psophometric weighting characteristics
Figures
1. D.C. characteristics: upper limit for type B
apparatus
2. Measurement of free field sound pressure used in
the determination of sending sensitivity
3. Physical test arrangement for determining the
sending characteristic
4. Limits of sending sensitivity for line lengths up
to and including 3 km
5. Limits of sending sensitivity for line lengths in
the range over 3 km to 7.5 km
6. Physical test arrangement for determining the
receiving characteristics
7. Noise criterion curve NC 15
8. Dimensions of test table
9. Position of LST
10. The local telephone system
11. D.C. excited test circuit
12. Axes used in the determination of free field
conditions for 1 m radius sphere
Requirements for loudspeaking facilities incorporated in extension apparatus for connection to a single exchange line. Applies only where the apparatus containing the loudspeaking facility also provides either integral handset telephony or the capability of associated handset telephony.
| Committee |
TCT/301
|
| DevelopmentNote |
Supersedes 82/62714 DC (09/2005) Inactive for the new design. (01/2011)
|
| DocumentType |
Standard
|
| Pages |
24
|
| PublisherName |
British Standards Institution
|
| Status |
Withdrawn
|
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