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Traditionally, messages came into IMS through its SNA data communication protocol from VTAM.
传统上，消息通过SNA数据通信协议从VTAM进入IMS。
On the other hand, the standard of data communication protocol of the space is not unalterable.
另一方面，空间数据通信协议的标准也不是一成不变的。
The system composition, line warning device, main warning device and inner data communication protocol were introduced.
介绍了系统的组成、列告警器、总造警仪设计和内部数据通信具体约定。
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