About multiplex channel, a large number of problems frequently happened in protection cooperating between channel and diplex equipment.
而复用通道中，在保护与通道的配合上屡屡出现问题，通道设备双重化的问题也日趋严重。
About multiplex channel, a large number of problems frequently happened in protection cooperating between channel and diplex equipment.
而复用通道中，在保护与通道的配合上屡屡出现问题，通道设备双重化的问题也日趋严重。
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