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BS 6789-6.1:1986 Apparatus with one or more particular functions for connection to certain public switched telephone networks. Specification for series connected apparatus. Apparatus having maximum allowable impairments
standard by BSI Group, 12/31/1986
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Full Description
The values given for electrical characteristics represent the maximum impairment that may be introduced between a terminal apparatus and the NTP of Complete Branch System.Cross References:
BS 4778
BS 6305
BS 6312
BS 6317
BS 6320
BS 6450:Part 4
BS 6789:Part 1
BS 6789:Section 6.2
CCITT Recommendation P.53
Telecommunications Act 1984