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BS PD 6561:1992 A draft amendment to BS 6789-1:1984 "Apparatus with one or more particular functions for connection to the British Telecommunications public switched telephone network. Part 1. Specification for general requirements"
standard by BSI Group, 10/31/1992
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Cross References:
BS 6301
BS 6305
BS 6317
BS 6320
BS 6789:Part 1
BS 6789:Part 2
BS 6789:Part 3
BS 6789:Part 4
BS 6789:Part 5
BS 6789:Part 6
BS 6789:Part 7