Requirements for apparatus for connection, in series with a subscriber's main apparatus such as a telephone instrument or a data modem, to the Public Switched Telephone Networks (PSTN) either directly or when the series apparatus forms part of a Relevant Branch System for PSTN. To be read in conjunction with BS 6789-1:1984,BS 6789-6.1:1986
Cross References:
BS 6305
BS 6789:Part 1
BS 6789:Section 6.1
CCITT Recommendation P.53
Telecommunications Act 1974
Cross References:
BS 6305
BS 6789:Part 1
BS 6789:Section 6.1
CCITT Recommendation P.53
Telecommunications Act 1974
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