Prior to AIX Version 4, there was base X.25 support that provided a number of programming interfaces, higher layer protocols and applications. This support was provided through devices such as /dev/x25s0 . With the X.25 support provided by the separate Licensed Programs, this former interface is emulated through common input/output (COMIO) emulation. Each X.25 port sx25a that requires COMIO emulation should have it selected through SMIT configuration.
Important Note: All the documentation in this chapter refers to use of the COMIO emulator, its programming interfaces or applications. Ensure that a suitable COMIO emulation port is available for use.