Synchronous protocol and asynchronous protocol are in common use in digital communication.
数字通信中，常用的通信协议有同步协议和异步协议。
Use a synchronous protocol with a request-response interaction pattern, and define faults that are understandable by the end user.
使用采用请求-响应交互模式的同步协议，并定义最终用户可理解的错误。
Compares with the fixed cyclical time synchronization algorithm, this algorithm can reduce the expenses of synchronous protocol.
与固定周期的时间同步算法相比，该算法能够减少同步协议的开销。
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