CHPID interface type

The (physical) interface type is independent of the (logical) CHPID type, and does not always match (physical-logical inconsistency). To correct inconsistencies, change the CHPID interface type:

• Go to the CHPIDs dialog
  • either via the CHPIDs button in the Channel Subsystems section of the Processor dialog or
  • by directly double-clicking a channel subsystem's CHPIDs from a Processor context menu.
• In the CHPIDs dialog, press the Interface Type… button to reach the Change Path Interface Type dialog

Crossbar switch interfaces are always parallel. ESCON or FICON switch interfaces (ports) are always serial. CHPIDs can be any of the five path interface types. Controller channel interfaces can be parallel, serial, IOC or OSA. Note that converters can only convert between parallel and serial; interfaces of the type coupling, IOC or OSA can only connect to each other.

Changing between serial and parallel interface types can usually be done while the interface is connected; converters are inserted or removed as appropriate.