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BS PD 6571:1992 Text for BS 6789-2:1992 "Apparatus with one or more particular functions for connection to public switched telephone networks run by certain public telecommunication operators. Part 2. Specification for apparatus with loudspeaking facilities"
standard by BSI Group, 10/31/1992
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Full Description
Cross References:
BS 1088
BS 2475
BS 3593
BS 4778
BS 5940:Part 1
BS 6305
BS 6312
BS 6317
BS 6450:Part 4
BS 6789:Part 1
BS 6789:Part 2
BS 6789:Part 6
PD 6568
CCITT Recommendation P.34
CCITT Recommendation P.51
CCITT Recommendation P.53
Telecommunications Act 1984