16 PCI ESCON Adapter Installation Guide
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 anddefaults to zero
(0) if not coded.