Adding communications support between systems

You can include communications to other systems in a CICS® region by using either ISC over SNA or IP interconnectivity (IPIC).

MRO can be used only for CICS-to-CICS connections in the same z/OS® image or z/OS sysplex. If you connect CICS to both CICS and non-CICS systems, and the remote systems can be inside or outside the local z/OS sysplex, CICS offers intersystem communication over SNA (ISC over SNA) and intersystem communication over TCP/IP. Intersystem communication over TCP/IP is known as IP interconnectivity (IPIC).

Unlike MRO, no special z/OS operating system requirements apply to these methods of communication.