fiber bidirectional linear switched ring
...道保护环 Two-fiber unidirectional path protection ring 双纤双向线性倒换环 two-fiber bidirectional linear switched ring 双相制 Biphase System ..
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fiber bidirectional linear switched ring
光纤双向线性开关环
以上为机器翻译结果，长、整句建议使用 人工翻译 。