双速率码型变换板 Dual-Rate Transcoder DRT 双头电话线 Dual-port Telephone Line 双纤单向通道保护环 Two-fiber unifacial line protection ring ..
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... 双速率码型变换板 Dual-Rate Transcoder DRT 双头 电话线 Dual-port Telephone Line 双纤单向通道保护环 Two-fiber unidirectional path protection ring ...
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