IBM AS/400 manual Example Communications subsystem configuration, Set up the communication entries

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Example: Communications subsystem configuration

1.Create a duplicate of QCMN:

CRTDUPOBJ OBJ(QCMN) FROMLIB(QSYS) OBJTYPE(*SBSD) TOLIB(MYLIB) NEWOBJ(MYCMN)

2.Set up the communication entries:

ADDCMNE SBSD(MYLIB/MYCMN) DEV(PC*)

ADDCMNE SBSD(MYLIB/MYCMN) DEV(PC*) MODE(QSERVER) MAXACT(0)

ADDCMNE SBSD(QSYS/QCMN) DEV(PC*) MODE(QPCSUPP) MAXACT(0)

3. If desired, update your system startup program to start your new subsystems automatically.

Communications performance considerations for interactive jobs

An interactive job is one that uses a keyboard and character-type display. If a job needs the user to type on the keyboard and display character results, that job is probably considered interactive. Interactive in this sense means that the job and the user depend on each other to get the work done.

To optimize communications performance for interactive jobs, consider the following:

vAttach work stations through communications requires more CPU overhead than 5250 local workstations.

vUse a twinaxial controller to provide better performance than an American National Standard Code for Information Interchange (ASCII) controller.

vKeep the line utilization below 30 percent for best performance when interactive users are attached. This will maintain predictable and consistent response times. Exceeding 50 to 60 percent line utilization will usually cause unacceptable response times.

If your system has interactive users who are connected many different ways, you should consider configuring your interactive subsystems to separate the users. Local workstation, remote workstations, 5250 display station pass-through, or Telnet are some examples of these types of connections that should be separated. When you configure interactive subsystems, identify how you want the interactive users to be separated and create the appropriate subsystem descriptions.

During error recovery, when many users risk losing their sessions at one time, an interactive subsystem can be very busy performing device recovery. This device recovery can adversely affect the work of other users in the subsystem who would otherwise be unaffected by the failure. Therefore, you may need to change how the interactive subsystems are configured. However, multiple subsystems can provide multiple processes to do cleanup and recovery when error conditions occur. This can result in improved performance.

The example below shows how to configure an interactive subsystem to allocate devices that begin with devname* and present a signon display on those display devices:

ADDWSE SBSD(libname/sbsname) WRKSTNDEV(devname*) AT(SIGNON)

Use the following example to configure an interactive subsystem so that the device name devname* is not allocated and a signon display does not appear.

ADDWSE SBSD(libname/sbsname) WRKSTNDEV(devname*) AT(*ENTER)

Adding workstation entries with AT(*ENTER) allows you to use the Transfer Job (TFRJOB) function into that subsystem. If the TFRJOB function is not required or necessary, there is no need to add the workstation entries with AT(*ENTER).

To specify the devices an interactive subsystem should allocate when the subsystem is started:

ADDWSE SBSD(libname/sbsname) WRKSTN(devname*) AT(*SIGNON)

To specify the devices an interactive subsystem should not allocate when the subsystem is started:

ADDWSE SBSD(libname/sbsname) WRKSTN(devname*) AT(*ENTER)

vSee the following example for a way of configuring your interactive subsystem.

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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 network server description Configuring AS/400 for communicationsCreating a network interface description Creating a line descriptionVersion Optimizing communications performance Adjusting WAN protocols for optimum AS/400 performanceAdjusting the WAN line speed for optimum AS/400 performance Improving wide area network performanceWAN line speed considerations for IOPs Adjusting LANs for optimum communications performance Adjusting LAN lines for optimum communications performanceImproving local area network performance LAN line speed considerations for IOPs Improving data path performanceAddcmne SBSDlibname/sbsname DEVdevname* MODEmodename Example Communications subsystem configuration Set up the communication entriesExample Interactive subsystem configuration Communications performance considerations for batch jobsMixing interactive and batch jobs on a WAN line Setting up the AnyNet environment Performance considerations for AnyNet communicationsAnyNet communications for the AS/400 system Subsystems QusrwrkVersion Communications applications User written Appc applicationsDistributed data management DDM Version Communications applications Version Communicating with host systems Matching AS/400 parameters for a host systemSSAP/DSAP/remote-adapter-address Name Rmtnetid Vtamlst Netid Maxframe Group MaxdataRmtcpname Vtamlst Sscpname Ssap SapaddrLocadr Locaddr Mode Modeent LogmodeLcllocname Dfhtct Netname Locpwd Dfhtct BindpwdModd Modeent Logmode Examples Connecting AS/400 to a host systemAS/400 Host Definition AS/400 Prompt Cosd Modeent COSCommunicating with host systems Version Communicating with host systems Version Configuring dependent LU requester Dlur Configuring the host controller descriptionConfiguring the device descriptions Version Adptadr Communicating with a remote AS/400 systemAS/400 Remote AS/400 AS/400 Prompt AdrinsertAS/400 Remote AS/400 AS/400 Prompt Parameter Cnnpwd X25DCECnnnbr Netadr Dsap SsapRmtcpname Lclcpname InlcnnLinkpcl Rmtnetid LclnetidConnecting one AS/400 to another AS/400 system Version Communicating with a remote AS/400 system Version Communicating with remote workstation controllers Matching AS/400 parameters for 5494 controllersRmtcpname AS/400 5494 Prompt AS/400 Parameter Field Subfield ValueLAN RmtnetidAS/400 5494 Prompt AS/400 Parameter Field Subfield Linktype LANMatching 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 AS/400 Prompt Parameter Field Subfield AS/400 ValueField Subfield AS/400 Value Communicating with remote workstation controllers Matching AS/400 parameters for a 5494 connected by Example Connecting AS/400 to a 5494 controller connected by LinktypeIBM 5494 Remote Control Unit Planning Guide, GA27-3936 Ellc DftpktsizeLinkpcl Qllc NetlvlAS/400 5494 Prompt Field Subfield ValueCommunicating with remote workstation controllers Matching AS/400 parameters for a 3174 controller 3174 AS/400 Configuration PromptMatching AS/400 parameters for 3x74 controller Questions3174 AS/400 Configuration Prompt Parameter Questions NRZ or Nrzi Encoding Switched Short-Hold ModeMatching AS/400 parameters for a 3274 controller Control Unit AddressExample Connecting an AS/400 to a 3174 control unit 3274 AS/400Prompt Parameter Number Matching AS/400 parameters for finance controllers Matching AS/400 parameters for 470x finance controllersAS/400 AS/400 Prompt Parameter Macro Matching AS/400 parameters for Fbss finance controllers AS/400 AS/400 PromptMacro Parameter Line mode Switched lineService access point for PC PC addressMatches the Fbss Identification number Service access point for Host/37xx/4700Identification block and Identification number Data Link ControlExample Connecting AS/400 to a finance network Matching AS/400 parameters for retail controllersMatching AS/400 parameters for 3651 retail controllers AS/400 Definition AS/400 Prompt Parameter StatementAS/400 Definition AS/400 Prompt AS/400 Parameter Sdlclin Bit Bit ValueMatching AS/400 parameters for 3684 retail controllers 3684 AS/400 Definition Prompt3684 AS/400 Definition Prompt Parameter CNN*MP SNBU*NO Matching AS/400 parameters for 4680/4690 Line parameterAS/400 Parameter Linecon Bit Bit Value SNBU*YES MODEMRATE*FULLAS/400 Prompt AS/400 Parameter Line Parameter Exchid parameter specified on the AS/400 Crtctlrtl commandMatching AS/400 parameters for 4680/4690 Link parameter CNNLocal node Hex Wire constant RTS?Matching AS/400 parameters for 4684 retail controllers Remote node HexExamples Connecting AS/400 to a 4690 retail controller Version Communicating with remote workstation controllers Version Troubleshooting communications problems Displaying message queues to solve communication problemsJob logs and communication problems QsysarbSolving communication problems using communications trace QpasvrpSystem service tools and communication problems Trace option settingSolving communication problems using the system problem log Trace fullUsing error messages to aid in error recovery Solving communication problems using status informationConsiderations for system tuning during error recovery Solving communication problems using reason codesReason Codes for Rejected Program Start Requests Reason Code Reason DescriptionReason Code Reason Description Networking concepts Advanced Peer-to-Peer NetworkingAdvanced program-to-program communications Dependent LU requester supportHigh-performance routing HPR architecture option setsInternetwork packet exchange support What is Systems Network Architecture What is TCP/IPATM on AS/400 Common networking standardsLocal area network standards Distributed data interface networkWireless network Token-ring networksBinary synchronous communications Wide area network standardsAsynchronous communications Frame relay networksIntegrated services digital network Synchronous data link control 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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