The communications server supports three protocols: XCF, VTAM LU 6.2, and VTAM LU 0.
Cross System Coupling Facility (XCF)
The XCF protocol provides reliable, high speed communication between systems in a sysplex environment. A sysplex (systems complex) is a set of z/OS systems that have been given a sysplex name and authority to use XCF services. Since XCF provides the fastest and most reliable method for data transmission, CA strongly recommends that you use it where available.
Virtual Telecommunications Access Method (VTAM)
You can use either VTAM LU 6.2 or VTAM LU 0 for communication between z/OS systems that are not part of a sysplex. If you have some z/OS systems that are within a sysplex and others that rely on VTAM, you can implement both methods within the same communications server.
Important! The same z/OS system can simultaneously use both the XCF protocol and the VTAM protocol; however, communication between any two z/OS systems must be exclusively handled using either the XCF protocol or one of the VTAM protocols.
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