信道与传输量控制设备 channel and traffic control facility
基础网络体系结构可分为三个层次(设备层、传输层和控制层)，其上还有服务层，我们将按照从下向上的顺序分别进行介绍。
The underlying network architecture can be divided into three layers (Device layer, Transport layer, and Control layer) plus the service layer and will be introduced from bottom to top respectively.
控制传输：这些是一些短的数据包，用于设备控制和配置，特别是在设备附加到主机上时。
Control transfers: These are short data packets for device control and configuration, particularly at attach time.
电力系统操作员监视和操作交换机及电气控制中心的相关设备，控制传输网络中电力的分布。
Power systems operators monitor and operate switchboards and related equipment in electrical control centres to control the distribution of electrical power in transmission networks.
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