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 Sub-Channel address for the device, ranging in value from 00-FF hexadecimal. This address should match that coded in the UNITADD parameter of the CNTLUNIT macro in the IOCDS. Sub-channel addresses must be unique across any one partition.

For IBM Communications Server, Microsoft Host Integration Server, Microsoft SNA Server, or Bus-Tech TN3270E Server a unit address must be configured for each PU defined in the gateway. These addresses must be coded with UNIT=3174 in the CNTLUNIT macro of the IOCDS.

For Bus-Tech TCP/IP Passthrough and TCP/IP Direct Connect two adjacent unit addresses must be defined for each connection. These device addresses must be coded as UNIT=3088 or UNIT=SCTC in the CNTLUNIT macro in the IOCDS.

For TCP/IP Passthrough the first address of the pair must always be even numbered; for example: 12-13, 8A-8B, etc.

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-F. This number must match that coded in the CUADD parameter of the CNTLUNIT macro in the IOCDS. Note that CUADD is an optional field in the IOCDS and defaults to zero

(0) if not coded.

16 PCI ESCON Adapter Installation Guide

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Multi-Tech Systems 40-01459-D0-001 manual PCI Escon Adapter Installation Guide