The major alarm maintenance signal of SDH transmission system are introduced and its implication and failure reason are described.
介绍了SDH传输系统主要告警维护信号，描述了告警维护信号的含义和故障产生原因。
The major alarm maintenance signal of SDH transmission system are introduced and its implication and failure reason are described.
介绍了SDH传输系统主要告警维护信号，描述了告警维护信号的含义和故障产生原因。
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