略語大辞典 [Opt] 30 FITL fiber in the loop (system) 光ファイバー通信ループ. 光ファィバー通信ネットワーク.fiber in the loop (system); a fiber optic communication network; defined in Bellcore TR909; transmits a broad range of basic telephone and video services viafiber optic loops, providing a method for local telephone companie 丸善「略語大辞典」JLogosID : 11874967