PD 6571:1992
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
BS 6789-2:1992. Apparatus with one or more particularfunctions for connection to public switched telephone networks run bycertain public telecommunication operators. Specification forapparatus with loudspeaking facilities
Hardcopy , PDF
02-08-2013
English
31-10-1992
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Committees responsible
Preface
Foreword
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 (speech
apparatus)
Section two. Electrical characteristics of apparatus
6 Apparatus on-line (non-signalling state)
7 Transmission process
Appendices
A General conditions of test
B Methods of test
Tables
1 Not assigned
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 Not assigned
2 Measurements of free field sound pressure used in
the determination of sending sensitivity
3 Physical test arrangement for determining the
sending characteristics
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 characteristic
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
Specifies requirements for loudspeaking facilities incorporated in apparatus for connection to a single exchange line or to systems connected to the public switched telephone network. Not applicable to apparatus for connection to shared service lines nor to apparatus for connection between a TJF of a PBX and the PSTN lines of a PBX. Only applies where the apparatus containing the loudspeaking facility also gives either integral handset telephony or the capability of associated handset telephony. Coverage includes: abbreviations, definitions and notation; apparatus on-line (non-signalling state); transmission process. Also includes appendices, tables and diagrams.
| Committee |
TCT/301
|
| DevelopmentNote |
Supersedes 91/94132 DC. (08/2005) Inactive for the new design. (01/2011)
|
| DocumentType |
Standard
|
| Pages |
44
|
| PublisherName |
British Standards Institution
|
| Status |
Withdrawn
|
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