Finally, using both ESCON Directors and EMIF, it is possible for a single ESCON controller to communicate with multiple Logical Partitions (LPARs) running on multiple mainframes, using multiple ESCON channels.
Because an ESCON controller may be attached to an ESCON director, which may be connected to multiple mainframes and Logical Partitions (LPARs), it is necessary to configure the ESCON controller in order to define how the unit will appear to each environment.
The following information needs to be configured for each logical connection that is to be supported across the physical ESCON cable:
Device Address – The
For IBM Communications Server, Microsoft Host Integration Server, Microsoft SNA Server, or
For
For TCP/IP Passthrough the first address of the pair must always be even numbered; for example:
For MPC+ two or more unit addresses must be defined. These device addresses must be coded as UNIT=SCTC.
EmulationType – The type of IBM controller this device is to emulate (look like) to the mainframe. Valid types are "3174" for SNA Gateways (Host Integration Server, SNA Server, or Communications Server), GENERIC" for TCP/IP Passthrough, and “MPC” for TCP/IP Direct Connect and MPC+ for Windows.
Control Unit – The control unit address the mainframe will use to communicate with the controller and the controller will use to identify itself to the mainframe. Control Unit Address is a hexadecimal number ranging from
(0) if not coded.