用于Symphony系统在通信网络上与其它计算机及有关控制设备接口的硬件设备称为：计算机接口单元（Computer Interface Unit），简称CIU。 网络接口设备（Network Interface Unit）：用于Symphony系统网络和网络连接的硬件设备称之为网络接口设备。常用的型号有IIL、IPL。
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