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C37.94
IEEE C37.94 , full title ''IEEE Standard for N Times 64 Kilobit Per Second Optical Fiber Interfaces Between Teleprotection and Multiplexer Equipment'', is an IEEE standard, published in 2002, that defines the rules to interconnect tele-protection and multiplexer devices of power utility companies. The standard defines a data frame format for optical interconnection, and references standards for the physical connector for multi-mode optical fiber. Furthermore, it defines behavior of connected equipment on failure of the link, and the timing and optical signal characteristics.
==Overview==
Power utility companies protect high voltage lines by monitoring them constantly. This supervision requires the transmission of information between the power substations in order to ensure correct operation while controlling every alarm and failure. Legacy telecom networks were interconnected with metallic wires, but the substation environment is characterized by a high level of electromagnetic fields that may disturb BNC connectors and copper wires.
The use of optical links at the physical layer, instead of the traditional metallic cables, as described in the IEEE C37.94 standard solves these issues.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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