1989 Edition, February 28, 1989
Apparatus with one or more particular functions for connection to public switched telephone networks run by certain public telecommunications operators - Part 6: Specification for series connected apparatus - Section 6.2 Apparatus having less than maximum allowable impairments
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Description / Abstract:
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