供电干线通信系统。协议，数据集成和界面。
Mains communications systems. Protocol and data integrity and interfaces.
光纤传输也已成为当前通信，特别是干线通信的主要手段。
Optical fiber transmission has also become the major means of communication, particularly in the trunk communication network.
文中介绍了主要技术指标和组成方框图，并讨论了为保证干线通信可靠性所采取的技术措施。
The major performances and the block diagram are described, and some technical measures adopted to ensure reliability on the main path are also discussed.
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