这就是为什么短信长度如此受限：它不能超过用于基站和手机间内部通信的消息的长度。
That's why a message is so limited in length: it must not exceed the length of the message used for internal communication between tower and handset to set up a call.
如何提高电力系统二次装置内部通信的速度，增加通信容量是摆在我们面前的紧要课题。
How to improve internal communication speed of secondary equipment and how to enlarge communication volume are urgent targets we have to face.
本文主要研究了SCADA系统中远动通信和子站内部通信的实现，以及通信子系统串口及单元组态的实现。
This dissertation studies the realization of communication in SCADA, and actualizes configuration of communication COM and unit.
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