ISC communication with CICS over TCP/IP

ISC supports TCP/IP only for connections between IMS and CICS. ISC TCP/IP support uses a private protocol, IP interconnectivity (IPIC), that is defined by CICS. The use of IPIC is generally consistent with the protocols that are defined by SNA for ISC VTAM® and is transparent to application programs that use ISC.

IMS Connect provides the TCP/IP connection support for ISC. The Structured Call Interface (SCI) of the IMS Common Service Layer (CSL) provides the communication path between IMS and IMS Connect.

Both dynamically and statically defined ISC terminals can use TCP/IP. However, if you are defining new ISC terminals to support TCP/IP, use dynamic terminals. Dynamic terminals do not require a system definition or a cold start of IMS and provide much greater flexibility than static ISC terminals. Dynamic ISC terminals are defined by coding logon descriptors in either the DFSDSCMx or the DFSDSCTy members of the IMS.PROCLIB data set.