Introduction to connection definition
You can define different types of connections in CICS. You can use MRO and ISC over SNA (APPC and LUTYPE 6.1) connections or IP interconnectivity (IPIC) over TCP/IP connections.
MRO and ISC over SNA connections
- The definition of the remote system itself
- The definition of sessions with the remote system
The remote system is defined by a CONNECTION resource. Each session, or group of parallel sessions, is defined by a SESSIONS command. The definitions of the remote system and the sessions are always separate and are not associated with each other until they are installed.
For single-session APPC terminals, you can use an alternative method of definition by using the TERMINAL and TYPETERM resources.
If the remote system is a CICS® region or any other system that uses resource definition to define intersystem sessions, for example, IMS, the connection definition must match a compatible definition in the remote system. For remote systems with little or no flexibility in their session properties, for example, APPC terminals, the connection definition must match the fixed attributes of the remote system concerned.
IPIC connections
The definition of an IPIC connection between two CICS regions consists of two parts:
- The definition of the outbound attributes of the connection, including the target CICS region
- The definition of the inbound attributes of the connection, including the port number that CICS listens for requests