Multipath channel (MPC) connections allow you to code a single transmission group (TG) that uses multiple write-direction and read-direction subchannels. The subchannels may be assigned to one or more physical channels based on how you have defined your I/O subsystem to the operating system. Because each subchannel operates in only one direction, the half-duplex turnaround time that occurs with other channel-to-channel connections is reduced.