vFrame relay direct network: Allows data that uses SNA, TCP/IP, or IPX communications over a frame-relay network to move at speeds of up to 2.048 Mbps. This support allows a network of systems to communicate using the frame-relay network as a backbone, without the need for multiple leased T1 lines.

vBridged frame relay network: Allows AS/400 to communicate over a frame-relay network through a remote bridge. The bridge is attached to a token-ring, Ethernet, or distributed data interface (DDI) network. Bridged frame relay connections allow AS/400 to communicate with stations on the remote local area network (LAN) as if they were attached locally to the LAN medium.

For more information, see Frame relay.

Integrated services digital network

You can connect your AS/400 to an Integrated Services Digital Network (ISDN) for faster, more accurate data transmission. An ISDN is a public or private digital communications network that can support data, fax, image, and otherservices over the same physical interface. Also, you can use other protocols on ISDN, such as ISDN data link control (IDLC), PPP, fax, and X.25.

ISDN provides benefits that are not found in more conventional types of communications. These include the following:

vHigh speed, low error rate communications

vSwitched, high speed communications

vSwitched, digital networking

vAdvanced networking functions

vIntegration of voice and data transmissions

vIntegrated support of packet switching (X.31)

For more information on ISDN, see the topics ISDN on AS/400 and ISDN data link control network.

ISDN data link control network

You can use ISDN data link control (IDLC) to connect two systems to exchange information over an ISDN B-channel.

IDLC complies with the data link control protocols that are defined in CCITT Recommendations Q.921 and Q.922. IDLC defines a set of protocol rules and formats for use on D-channels and B-channels. On the D-channel, IDLC provides a reliable link with the network equipment. On the B-channel, IDLC provides a reliable link with another end user.

Similar to other data link protocols, IDLC has special considerations for operation:

vIDLC parameters used to establish the logical connection

vDelayed contact for permanent connection

vFrame size related to performance

vDisconnect parameters for a switched IDLC controller

Synchronous data link control network

SDLC has the following meanings:

vA form of communications line control that uses commands to control the transfer of data over a communications line.

vA communications discipline that conforms to subsets of the Advanced Data Communication Control Procedures (ADCCP) of the American National Standards Institute (ANSI) and high-level data link control (HDLC). These standards are part of the International Organization of Standardization.

SDLC is used for transferring synchronous, code-transparent, serial-by-bit information over a communications line. Transmission exchanges may be duplex or half-duplex over switched or nonswitched lines. The configuration of the connection may be point-to-point, multipoint, or loop.

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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.
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