EIA RS-210:1958

INTRODUCTION The standards included in Part 1 are for Terminating and Signaling equipment to be used in Telephone Service. Subsequent parts will cover such services as Data Transmission, Remote Control, Teletype, Facsimile, and so on. Because there are so many accepted practices in the telephone industry, each devised to meet pertinent requirements in specific situations, it is difficult to reduce these practices to a single standard for Terminating and Signaling equipment for Telephone Service. Where it appears impractical to establish a numerical value for a Standard, examples of current practices, or informative notes on relative importance, have been given. One of the most important considerations is the achievement of a common acceptance of terms and their definitions. Wherever possible, terminology already established by recognized organizations have been used. Where no previously accepted terms and definitions were available, they were prepared by the cognizant EIA Engineering Committee. A list of applicable terms, their sponsors and reference, is included in this Standard.