IEEE 305

Description / Abstract: This Guide contains information and recommendations for applying audio-tone communication over telephone channels for power-system relaying. It is intended to cover applications to both leased and private telephone systems but not applications to private microwave or carrier channels. Included are sections on transmitting and receiving equipment, leased telephone channels, application principles, installation, and testing. Reflected in this work is the knowledge and experience of equipment manufacturers and telephone companies as well as that of the users. Pertinent information previously published is also included.

This Guide is not intended to supplant specific or general instructions contained in the manufacturers' instruction books or in any contractual agreement between a manufacturer and/or telephone company(s) and a purchaser of a given relaying system.

PURPOSE

The primary purpose of correlating this information and experience is to guide the power-system user in applying, installing, and operating audio-tone protection systems, including considerations for the telephone-channel facility. In doing so, it will also provide a reference for the manufacturers and telephone personnel engaged in design and application of equipment and facilities. The Guide has been prepared not only for those considering audio-tone relaying for the first time, but as a reference for the experienced.