设计了PLC与PC机串行通讯口之间信号适配器硬件电路，包括输入接口电路、输出接口电路。
This research works out a design of signal adaptor circuit of serial communication port between PLC and PC, including input interface circuit and output interface circuit.
该方案结合SDH技术和AT M技术两者的优点，提高了DVB信号适配到SDH网络的适配效率，同时满足了HFC不同调制方式的灵活性。
This scheme combined the advantages of SDH technology and ATM technology, improved adaptation efficiency from DVB signal to SDH network, and satisfied HFC modulation mode's flexibility.
大约60000用户有专用适配器来接收和转换信号。
About 60,000 subscribers have special adapters to receive and decode the signals.
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