NF C93-909-091-2*NF EN 61753-091-2:2013
光纖互連器件和無源元件 性能標準 第091-2部分:C類非連接單模有抽頭的循環器 受控環境
Fibre optic interconnecting devices and passive components - Performance standard - Part 091-2 : non-connectorised single-mode fibre optic pigtailed circulators for category C - Controlled environment