Installation guide

10
SCON-3074 Configuration
707112-001
None, the SCON-2XL will treat the interface as if it does not exist.
Device Low and Device High
The value for the Device Low and Device High parameters identify the low end and high end
for a range of addresses supported by this CU. The value of the Device Low number is given
in hex, and can be anywhere in the range of 00-FF. The Device High number must be within
hex 1F of the value of the Device Low parameter and must be equal to or larger than the
Device Low value. The range defined by the Device Low and Device High parameters may
define up to 32 consecutive addresses, and must fall in the range of addresses defined by the
‘UNITADD’ parameter in the ‘CNTLUNIT’ macro of the corresponding Host GEN. To support
more than 32 addresses, make additional CU definitions.
Only configure the SCON-3074 for addresses that have been defined by IO Device Statements
in the GEN on the host. Configuring addresses that have not been defined or that have been
defined for use by another controller may result in serious performance degradation or errors.
LPAR Number
The LPAR Number parameter corresponds to the LPAR number assigned in the PARTITION
parameter of the RESOURCE macro, associated with this connection, in the host’s IOCDS
definition.
Source Link Address
The Source Link Address refers to the ESCON Director port number (2 digit hex) that is
connected back to the mainframe. If an ESCON Director is not used (the SCON-3074 is
directly connected to a port on the mainframe), leave the default value of FF, or assign the
value as 01.
CU Number
This must correspond to the value of the CUADD parameter of the CNTLUNIT macro of the
host’s IOCDS definition, corresponding to this configuration.
Hot Sessions
Hot Console Sessions give you the ability to create a console session that will appear to be
powered on to the LPAR for as long as the SCON-3074 is online. This may be convenient for
situations where it is desired to have a console session that can be accessed across a network
connection by either one person or by multiple persons. Since the console device always
appears to be powered on, it should not be necessary to vary the console active when
establishing a new connection to the session, as long as the SCON-3074 was active when the
LPAR came up. It should be understood that a hot session will not roll to a backup as long as
the SCON-3074 is communicating.
Each of the 32 sessions that may be associated with a single CU definition, can be configured
to be hot. Hot sessions are identified as such, by changing the value from ‘0’ in the appropriate
column. Definitions for the values to enter are:
0 = Not defined to be a hot session
1 = Hot Session (Mod 2 with Extended Data Stream Support)
2 = Hot Session (Mod 2 with Extended Data Stream Support)