Chapter 9 Communications Circuits 9.2 COMMUNICATIONS CIRCUITS a channel is a subdivision of a circuit and is a one way path for communicating. a data circuit is sometimes divided into two channel: data channel and control channel The data channel is called the forward channeland the control channel is the reverse channel www.gxmu.edu.cn9.2 COMMUNICATIONS CIRCUITS A channel is a subdivision of a circuit and is a one way path for communicating. A data circuit is sometimes divided into two channel:data channel and control channel. The data channel is called the forward channel,and the control channel is the reverse channel. www.gxmu.edu.cn Chapter 9 Communications Circuits