Ⅰ: Classification code and its meaning are: GY—room (field) optical cable for communication; GR—soft optical cable for communication; GJ - optical cable in communication room (office); GS - optical cable in communication equipment;Ⅰ: Classification code and its meaning are: GY—room (field) optical cable for communication; GR—soft optical cable for communication; GJ - optical cable in communication room (office); GS - optical cable in communication equipment;This comprehensive reference of standardized fiber optic acronyms is a resource for understanding technical shorthand across networking and telecommunications. We add new fiber optic industry acronyms daily to provide the most comprehensive reference. Contact us if there is an acronym you would. Optical Fiber (OFC): Thin strands of glass/plastic that guide light. Mode: A single path for light to travel within the fiber. Used for long-distance, high-speed. Acronyms & Abbreviations - Fiber Optic ISO/IEC 11801 ; DIN/EN 50173 ; DIN/EN 50174 The following table contains a list of common abbreviations used in Structured Networking. In the field of telecommunications, GYTS (Gel-Filled Loose Tube Single-Mode) is a type of optical fiber cable that has gained popularity due to its numerous advantages.