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AIXLink/X.25 1.1 for AIX: Guide and Reference

Chapter 4. X.25 Installation and Configuration

The following information explains what you need to install the X.25 program and how to configure your system for X.25 communications.

Before you install the X.25 program, ensure that your system meets the minimum software and hardware requirements.

Minimum Requirements


You need the following software:



You need the following hardware:

Planning Your X.25 Installation

The best method for data transfer over a wide area network depends on a number of factors. Among the common factors are the amount of data traffic, the frequency that data is sent, response time required, and so forth. Along with these, the tariff available for the network providers can play an important part in protocol choice.

Once X.25 is decided upon, the specifics of the network subscription must be planned along with the network provider. Switched virtual circuits can be used by different applications, possibly to different remote destinations, at different times. Permanent virtual circuits are dedicated to a given remote destination. Depending on the type of X.25 traffic that is generated, the number and speed of X.25 lines must be decided, along with the number of virtual circuits, and so forth.

With the characteristics of the X.25 interfaces defined, X.25 adapters (X.25 Co-Processor/2 or the ARTIC Portmaster Adapter) to support these interfaces must be added to the system. Choice of adapter and line interface depends on the characteristics of the network subscription.

If you are using an AIX Version 3 system, the base AIX Version 3 X.25 may already be in use. With the base system active, it should be decided which adapters should be used to support the old X.25 system and which should be used to support the licensed program.

Note: If your X.25 applications use the Data Link Provider Interface (DLPI), and you are migrating to AIXLink/X.25 Version 1.1.4 from a prior version of the product, you may need to make changes to your DLPI applications.

The changes are necessary to allow your applications to make use of all adapters supported by the AIXLink/X.25 product. If your DLPI applications are not configured to use the IBM 2-Port Multiprotocol PCI adapter, then the changes are not strictly required. See Chapter 6, DLPI Overview, for more information.

Installation Procedure

The X.25 licensed program is delivered as an install-image. To install the X.25 program:

  1. Read "Planning Your X.25 Installation."
    AIX Version 3.2.5 users The licensed program is installed as one option, which installs all the product's files.
    AIX Version 4 users The files making up the licensed program are divided into a number of sets that may be installed independently. Installation of the X.25 run time system is a prerequisite for installation of any of the other X.25 options. When installing the X.25 files, the language environment should be set to E_US. The following options are available:
    • All
    • COMIO Compatibility Support and Applications
    • NPI and DLPI Support
    • Runtime Environment
    • TCP/IP Support
    • Triple-X Packet Assembler/Disassembler (PAD)
    • Applications such as SNA and XTALK the COMIO Compatibility support.
  2. Follow the instructions included with the program package.
  3. Use the installp command or SMIT to install the program.

Hardware Installation

The adapters should be installed as described in the system unit's documentation.

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