INTESYSTEM COMMUNICATION - IBM Mainframe

For communication between CICS and non-CICS systems, or between CICS systems that are not in the same operating system or MVS sysplex, you normally require an SNA access method, such as ACF/VTAM, to provide the necessary communication protocols.Communication between systems through SNA is calledintersystem communication (ISC).

Note:This form of communication can also be used between CICS systems in the same operating system or MVS sysplex, but MRO provides a more efficient alternative. The SNA protocols that CICS uses for intersystem communication are:

  • Advanced Program-to-Program Communication (APPC), otherwise known as Logical Unit Type 6.2 (LUTYPE6.2), which is the preferred protocol.
  • Logical Unit Type 6.1 (LUTYPE6.1), which is used mainly to communicate with IMS systems.

CICS Transaction Server for z/OS can use ISC to communicate with:

  • Other CICS Transaction Server for z/OS systems
  • CICS Transaction Server for OS/390 systems
  • CICS Transaction Server for VSE/ESA
  • CICS/VSE Version 2
  • CICS Transaction Server for iSeries
  • CICS/400 Version 4
  • CICS on Open Systems
  • CICS Transaction Server for Windows
  • IMS/ESA® Version 4
  • IMS/ESA Version 5
  • Any system that supportsAdvanced Program-to-Program Communication(APPC) protocols (LU6.2).

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