IEEE guide for power system protective relay applications of audio tones over telephone channels
By: sponsor, Relaying channels Subcommittee of the Power System Relaying Committee of the IEEE Power Engineering Society.
Contributors: IEEE Power Engineering Society. Power System Relaying Committee, Relaying Committee, Relaying Channels Subcommittee.; IEEE Standards Board.
Series: ANSI/IEEE -- C37.93-1987.
Publisher: Institute of Electrical and Electronics Engineers
Published: 1987
Place of publication: New York, NY
Language: eng
Number of pages: 35
Subjects: Protective relays -- Standards; Telephone communication channels -- Standards
Notes: At head of title: An American national standard.

"Approved September 10, 1987 IEEE Standards Board ; Approved November 4, 1987 American National Standards Institute."

ANSI C37.93-1987.

Bibliography: p. 33.

Also available via the World Wide Web with additional title: ANSI/IEEE Std C37.93-1987.