2004 Edition, March 25, 2004
Guide for Power System Protective Relay Applications of Audio Tones Over Voice Grade Channels
Includes all amendments and changes through Reaffirmation Notice , September 30, 2010
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Description / Abstract:
This guide contains information and recommendations for applying
audio tones over voice grade channels for power system relaying,
including transmitting and receiving equipment, leased voice grade
channels, application principles, installation, and testing.
Reflected in this guide is the knowledge and experience of
equipment manufacturers and telephone companies as well as that of
power utility users.