Communications applications | IBM AS/400 manual

Performance considerations for Common Programming Interface Communications

You can use Common Programming Interface Communications (CPI Communications) to write application programs that you want to communicate with advanced program-to-communications (APPC). The interface makes use of the System Network Architecture (SNA) LU (logical unit) 6.2 architecture to do the following:

vEstablish a conversation

vSend and receive data

vExchange control information

vEnd a conversation

vNotify a partner program of errors.

Intersystem communications feature (ICF) and CPI Communications programs have similar performances for small data transfers.

To optimize CPI Communications application programs, do the following:

vMinimize the use of flush and confirm.

vReceive a compile record and parse it in your buffer.

vDo not use multiple receive calls to receive a single record.

vUse Request-to-Send only when necessary.

To add or change communications entries to get the system set up for CPI Communications, do the following:

1.Type appropriate command on the AS/400 command line and press F4. v Add Communications Entry (ADDCMNE)

vRemove Communications Entry (RMVCMNE)

vChange Communications Entry (CHGCMNE)

2.Use the online help information to change, add, or remove parameter values.

3.Press Enter. The communications entries are added, changed or removed.

For more information about configuring CPI Communications, see:

v“Application program interface (API) performance considerations” on page 17

vCICS/400 Administration and Operations Guide

Chapter 4. Communications applications 19

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.