IBM manual Part 1. Getting started with AS/400 communications

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Part 1. Getting started with AS/400 communications

The AS/400 is an extremely versatile system for networking technologies, supporting a broad range of communication protocols. Protocols that are supported include TCP/IP, APPC, APPN, HPR, Remote workstation, asynchronous, and binary synchronous communications.

AS/400 communications configuration is done by either manually or automatically creating a set of configuration objects that represent the local and remote systems that are to communicate. The types of objects required for a communications configuration vary, depending on the type of communications being configured.

Many factors can affect the performance of the AS/400 in a communications environment. To achieve the best performance with your particular environment review the topics, Optimizing communications performance, and Communications applications.

You can configure your AS/400 system to communicate with another AS/400 system, a non-AS/400 system, or a remote controller. For information on how to do this, see the following:

vCommunicating with host systems

vCommunicating with a remote AS/400 system

vCommunicating with remote workstation controllers

Communication problems are inevitable and will probably be an issue as you manage your network. If you suspect that you are having communication problems, review the topic Troubleshooting communication problems.

Before beginning to work with AS/400 communications, you may want to review the topics, Chapter 9, “Networking concepts” on page 87 and Chapter 10, “Common networking standards” on page 91. Here, you can find information related to some of the technologies common to deploying modern networking solutions in an AS/400 environment.

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Contents ERserver Page ERserver Page Contents Troubleshooting communications problems Part 1. Getting started with AS/400 communications Version Print this topic Version Creating a line description Configuring AS/400 for communicationsCreating a network interface description Creating a network server descriptionVersion Improving wide area network performance Adjusting WAN protocols for optimum AS/400 performanceAdjusting the WAN line speed for optimum AS/400 performance Optimizing communications performanceWAN line speed considerations for IOPs Adjusting LAN lines for optimum communications performance Adjusting LANs for optimum communications performanceImproving local area network performance Improving data path performance LAN line speed considerations for IOPsAddcmne SBSDlibname/sbsname DEVdevname* MODEmodename Set up the communication entries Example Communications subsystem configurationCommunications performance considerations for batch jobs Example Interactive subsystem configurationMixing interactive and batch jobs on a WAN line Performance considerations for AnyNet communications Setting up the AnyNet environmentAnyNet communications for the AS/400 system Qusrwrk SubsystemsVersion User written Appc applications Communications applicationsDistributed data management DDM Version Communications applications Version Matching AS/400 parameters for a host system Communicating with host systemsSSAP/DSAP/remote-adapter-address Name Ssap Sapaddr Maxframe Group MaxdataRmtcpname Vtamlst Sscpname Rmtnetid Vtamlst NetidLocpwd Dfhtct Bindpwd Mode Modeent LogmodeLcllocname Dfhtct Netname Locadr LocaddrCosd Modeent COS Examples Connecting AS/400 to a host systemAS/400 Host Definition AS/400 Prompt Modd Modeent LogmodeCommunicating with host systems Version Communicating with host systems Version Configuring the host controller description Configuring dependent LU requester DlurConfiguring the device descriptions Version Adrinsert Communicating with a remote AS/400 systemAS/400 Remote AS/400 AS/400 Prompt AdptadrAS/400 Remote AS/400 AS/400 Prompt Parameter Dsap Ssap X25DCECnnnbr Netadr CnnpwdRmtnetid Lclnetid InlcnnLinkpcl Rmtcpname LclcpnameConnecting one AS/400 to another AS/400 system Version Communicating with a remote AS/400 system Version Matching AS/400 parameters for 5494 controllers Communicating with remote workstation controllersRmtnetid AS/400 5494 Prompt AS/400 Parameter Field Subfield ValueLAN RmtcpnameLinktype LAN AS/400 5494 Prompt AS/400 Parameter Field SubfieldMatching AS/400 parameters for a 5494 connected by Ethernet AS/400 5494 Prompt Parameter Field Subfield Value Version LAN Adptadr Matching AS/400 parameters for a 5494 connected by Sdlc Prompt Parameter Field Subfield AS/400 Value AS/400Field Subfield AS/400 Value Communicating with remote workstation controllers Matching AS/400 parameters for a 5494 connected by Linktype Example Connecting AS/400 to a 5494 controller connected byIBM 5494 Remote Control Unit Planning Guide, GA27-3936 Netlvl DftpktsizeLinkpcl Qllc EllcField Subfield Value AS/400 5494 PromptCommunicating with remote workstation controllers Questions 3174 AS/400 Configuration PromptMatching AS/400 parameters for 3x74 controller Matching AS/400 parameters for a 3174 controller3174 AS/400 Configuration Prompt Parameter Questions Control Unit Address Switched Short-Hold ModeMatching AS/400 parameters for a 3274 controller NRZ or Nrzi Encoding3274 AS/400 Example Connecting an AS/400 to a 3174 control unitPrompt Parameter Number Matching AS/400 parameters for 470x finance controllers Matching AS/400 parameters for finance controllersAS/400 AS/400 Prompt Parameter Macro AS/400 AS/400 Prompt Matching AS/400 parameters for Fbss finance controllersMacro Parameter PC address Switched lineService access point for PC Line modeData Link Control Service access point for Host/37xx/4700Identification block and Identification number Matches the Fbss Identification numberMatching AS/400 parameters for retail controllers Example Connecting AS/400 to a finance networkAS/400 Definition AS/400 Prompt Parameter Statement Matching AS/400 parameters for 3651 retail controllersAS/400 Parameter Sdlclin Bit Bit Value AS/400 Definition AS/400 Prompt3684 AS/400 Definition Prompt Matching AS/400 parameters for 3684 retail controllers3684 AS/400 Definition Prompt Parameter SNBU*YES MODEMRATE*FULL Matching AS/400 parameters for 4680/4690 Line parameterAS/400 Parameter Linecon Bit Bit Value CNN*MP SNBU*NOCNN Exchid parameter specified on the AS/400 Crtctlrtl commandMatching AS/400 parameters for 4680/4690 Link parameter AS/400 Prompt AS/400 Parameter Line ParameterRemote node Hex Wire constant RTS?Matching AS/400 parameters for 4684 retail controllers Local node HexExamples Connecting AS/400 to a 4690 retail controller Version Communicating with remote workstation controllers Version Displaying message queues to solve communication problems Troubleshooting communications problemsQsysarb Job logs and communication problemsQpasvrp Solving communication problems using communications traceTrace option setting System service tools and communication problemsTrace full Solving communication problems using the system problem logSolving communication problems using reason codes Solving communication problems using status informationConsiderations for system tuning during error recovery Using error messages to aid in error recoveryReason Code Reason Description Reason Codes for Rejected Program Start RequestsReason Code Reason Description Advanced Peer-to-Peer Networking Networking conceptsDependent LU requester support Advanced program-to-program communicationsHPR architecture option sets High-performance routingInternetwork packet exchange support What is TCP/IP What is Systems Network ArchitectureDistributed data interface network Common networking standardsLocal area network standards ATM on AS/400Token-ring networks Wireless networkFrame relay networks Wide area network standardsAsynchronous communications Binary synchronous communicationsSynchronous data link control network Integrated services digital networkIsdn data link control network Network Version
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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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