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.
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。
A typical lifetime test system includes a communication analyzer, power supplies, a handset controller, audio test instruments, and a DMM.
典型的寿命测试系统包括一台通信分析仪、电源、一个手机控制器、音频测试仪器和一台数字多用表（DMM）。
The digital handset studied in this thesis can provide another resolvent based on TDD for the Trunked communication system and cordless phone system.
本文所研究的TDD数字对讲机，它为无绳电话、集群通信系统提供了另一种基于TDD方式的选择方案。
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