double two-fiber path protection ring
two-fiber path protection ring 二纤通道保护环 double two-fiber path protection ring 双二纤通道保护环 Two-fiber unidirectional path protection ring 二纤单向通道保护环 ; 双纤单向通道保护环 ; 双纤单向通道掩护环 ..
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短语
二纤双向通道保护环
Two-fiber bi-directional path protection ring
;
directional path protection ring