ISC support for TCP/IP

ISC support for TCP/IP connections provides an alternative to the connection support provided by the Virtual Telecommunications Access Method (VTAM®). Existing statically defined ISC terminals can be enabled for TCP/IP support by coding the ISCTCPIP parameter in the DFSDCxxx PROCLIB member. ETO logon descriptors can be used to define dynamic ISC terminals that support TCP/IP.

To communicate with CICS over an ISC TCP/IP connection, IMS uses the private CICS IP interconnectivity (IPIC) protocol for session control and data flow. However, applications programs are not sensitive to the use of IPIC or the use of either ISC TCP/IP or ISC VTAM. Unless your application programs use functions that are not supported by ISC TCP/IP, you can switch from ISC VTAM links to ISC TCP/IP links without changing application programs on either side of the link.