此前，消费者不得不额外花钱购买苹果转usb数据转接口。
Previously, consumers have to pay extra money to buy apple USB data interface.
通过它可以完成计算机基带数据通信双方电话线物理链路的智能转接。
It implements intelligent switching such as connection and disconnection on computer baseband digital communication of telephone wire.
测试设备包括三个主要的功能模块：数据监控处理单元、智能监测单元和信号转接单元。
Based on this structure, the test system can be divided three parts: data process computer, intelligence board and signal transform cell.
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