Chapter 5. Communicating with host systems

You can configure the AS/400 system to communicate with a host system by matching AS/400 parameters.

Another option for AS/400 users is Dependent LU Requester Support (DLUR). DLUR allows dependent secondary logical units (LU 0, 1, 2, and 3) an entry point into the APPN network. DLUR support gives the appearance of having an adjacent connection to VTAM, but allows traversing the APPN network through intermediate nodes. To configure DLUR, see the page Configuring Dependent LU Requester (DLUR).

Matching AS/400 parameters for a host system

You can configure the AS/400 system to communicate with a host system. This configuration requires the coordination of parameters and values. The list contains only those configuration prompts and parameters that require coordination on both the AS/400 and the host system. In addition, some of the parameters that are listed may not apply to your particular configuration.

For examples of connecting an AS/400 to a host system, see “Examples: Connecting AS/400 to a host system” on page 26.

For information about configuring host systems, see the manuals VTAM Installation and Resource Definition, SC23-0111, and Network Control Program Resource Definition Reference, SC30-3254.

v“Matching AS/400 line description parameters for a host system”

v“Matching AS/400 controller description parameters for a host system” on page 23

v“Matching AS/400 device description parameters for a host system” on page 24

v“Matching AS/400 mode and class-of-service description parameters for a host system” on page 25

vFor more information on AS/400 parameters, see Communications Configuration .

Matching AS/400 line description parameters for a host system

You must match host system communications configuration parameters with AS/400 values. A description of these AS/400 values are in the following table. For information about configuring host systems, see the manuals VTAM Installation and Resource Definition, SC23-0111, and Network Control Program Resource Definition Reference, SC30-3254.

You can specify some host system parameters on multiple definition statements, such as the GROUP, LINE, PU, and LU. The following table lists only the lowest level definition statement that is used by the host system.

To configure an AS/400 to a host system:

vSee “Examples: Connecting AS/400 to a host system” on page 26 for an example of connecting an AS/400 to a host system.

vUse the following table for the line description parameter.

© Copyright IBM Corp. 1998, 2001

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IBM manual Communicating with host systems, Matching AS/400 parameters for a host system

AS/400 specifications

The IBM AS/400, now known as the IBM iSeries, is a midrange computer system that has been a cornerstone of enterprise computing since its introduction in 1988. Designed to provide a robust platform for business applications, the AS/400 is celebrated for its reliability, scalability, and integrated database capabilities.

One of the key features of the AS/400 is its Integrated Operating Environment, which blends hardware and software resources seamlessly. This integration allows businesses to execute diverse workloads, ranging from traditional applications to modern web-based services, all on a single platform. The operating system, OS/400 (now IBM i), offers a rich set of APIs and tools for developers, simplifying application development and management.

Another standout characteristic of the AS/400 is its built-in database, DB2 for i. This powerful relational database management system allows for efficient data handling and provides advanced features such as support for SQL, XML, and JSON, making it easier for businesses to manage their data and integrate it with other systems. The database's tight integration with the operating system enables high performance and security.

In terms of scalability, the AS/400 can accommodate small businesses as well as large enterprises, with the ability to support hundreds of users simultaneously. Its architecture allows for easy upgrades in hardware, meaning that organizations can scale their systems without replacing the entire infrastructure.

Security is another critical attribute of the AS/400. With a sophisticated security model, it offers built-in user authentication, access control, encryption, and auditing capabilities to protect data and applications from unauthorized access.

The AS/400 also supports multiple programming languages, including RPG, COBOL, Java, and PHP, giving organizations the flexibility to choose the development tools that best fit their needs. This diversity helps maintain legacy applications while also developing new ones that leverage modern technologies.

Moreover, the platform supports both traditional green-screen interfaces and modern graphical user interfaces, allowing organizations to transition smoothly into contemporary user experience paradigms.

Overall, the IBM AS/400 stands out as a resilient, flexible, and secure computing platform that enables organizations to effectively manage their business operations, streamline processes, and adapt to changing market demands. Its unique combination of integrated features and capabilities ensures that it remains relevant in today's fast-paced technology landscape.