It is recommended that you provide your operator with a diagram illustrating the layout of your signaling configuration. This diagram should include system names, device numbers assigned to inbound and outbound signaling paths or the names of list structures in which these paths are defined, and corresponding COUPLExx parmlib definitions. If coupling facilities are in use, the diagram should also include coupling facility-related information, such as their channel addresses. The operator will need this information if MVS™ is unable to establish connectivity between systems and requests operator intervention.