Across the Boards
Communications Device Drivers
Section 5 - General Configuration and Usage Information
Page 207
cfSOFTWARE Confidential,
2000
5.16 LU6.2 Configuration (continued)
pcMAINFRAME Host-Init Considerations
pcMAINFRAME Host-Init (CFXINIT) requires the definition of a group of VTAM APPLs. For LU6.2 support,
the following additional requirements must be met:
“APPC=YES” must be specified on each APPL.
Most LU6.2 connections will use modes #INTER or #BATCH. Ensure that the MODETAB selected
for the APPL contains these modes as well as a definition for mode SVASVCMG (these should be
present in the IBM default table, usually named IESINCLM).
You may wish to specify a non-default VPACING value. An initial setting of VPACING=3 is safe,
and may be increased later to improve performance.
If the pacing window is large, it may be necessary to increase the amount of VTAM buffer space for
the application. In MVS this involves specifying the MAXPVT parameter on the APPL statement, in
VSE the DSPACE parameter is specified on the JCL EXEC statement.
Multiple Domain SNA Network Considerations
If your network contains more than one VTAM, several additional considerations may apply:
If some of the VTAMs that are participating in LU6.2 sessions are not APPN nodes, then the VTAM(s)
adjacent to the subarea-only VTAMs need to be defined as INTERCHANGE nodes.
It may be necessary to add cross domain resource definitions if the resources (CICSs, CFXINITs, etc.)
accessed by the PC are not already visible to the VTAM supporting the emulator. Normally the APPN
search functions will take care of this, but in a mixed APPN/Subarea network the APPN search may not
be able to see the entire subarea network.
CICS
CICS 2.1 or later is recommended. In most installations the CICS startup parameters and VTAM definitions
will be set up already.
The following CICS startup parameter must be specified:
ISC=YES
The following VTAM definition requirements must be met:
Under no circumstances must “APPC=YES” must be specified on the CICS APPL. Again APPC=YES
must
not
be specified. CICS handles LU6.2 protocol processing internally, and does not use the
support built into VTAM.
Most LU6.2 connections will use modes #INTER or #BATCH. Ensure that the MODETAB selected
for the CICS APPL contains these modes as well as a definition for mode SVASVCMG (these should
be present in the IBM default table, usually named IESINCLM).
You may wish to specify a non-default VPACING value. An initial setting of VPACING=3 is usually
safe, and may be increased later to improve performance. See the discussion on “Pacing”, below.
If the pacing window is large, it may be necessary to increase the amount of VTAM buffer space for
the CICS region. In MVS this involves specifying the MAXPVT parameter on the APPL statement, in
VSE the DSPACE parameter is specified on the JCL EXEC statement.
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