Peer-to-peer
When defining FICON® CTC control units and devices, the integrated CTC control units, as described in FICON CTC channel, are not considered by IOCP to be within the channel. Instead, IOCP views the CTC control units and devices to be within the FC channel at the other end of a CTC connection. From the viewpoint of IOCP, the two channels in a FICON CTC connection can be considered as communicating directly with each other in a peer-to-peer fashion, without the integrated CTC control units in between. With unshared channels, each channel defines a CTC control unit for the channel at the other end of a CTC connection. With shared channels, each channel defines a CTC control unit for each partition which shares the channel at the other end of a CTC connection.