数据链路：两个或多个通信站之间的调制解调器、控制器或通信线路。
Data link: The communications lines, modems and controls between two or more data communications stations.
但是由于控制系统各异，通信协议不同，这些不同的RS485通信线路很难融合起来。
But it is difficult to blend these different RS485 lines because of different control systems and communication protocols.
前端设备：一种把一些通信线路与计算机系统联接起来的传输控制单元。
Front-end device: a transmission control unit that links a number of communication lines to a computer system.
光纤通信线路检测到的电功率随差分群延迟变化，可以作为PMD补偿的反馈控制信号。
Electrical power, changing with differential group delay (DGD) and detected from an optical communication link, can be used as feedback signals of compensating for PMD.
在计算机网络通信中，为了降低数据通信线路传输的误码率，可以采用一种差错检测控制———循环冗余码校验(CRC)。
In this paper, it studies one of the error-check controls of the communications of computers network-Cyclic Redundancy check (CRC).
在计算机网络通信中，为了降低数据通信线路传输的误码率，可以采用一种差错检测控制———循环冗余码校验(CRC)。
In this paper, it studies one of the error-check controls of the communications of computers network-Cyclic Redundancy check (CRC).
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