Terminology
The information in this chapter will help you complete step 5 of the "Configuration and Reconfiguration Planning Procedure." Step 5 is located on page 3-6.
Before you start, you will need the following:
• The Asynchronous Emulation Adapter: Introduction, which you must read before planning to configure an AEA (Asynchronous Emulation Adapter). That book explains ASCII terminology, specifies requirements and restrictions that apply to ASCII configurations, and it gives detailed examples of possible con-figurations of ASCII hosts, display stations, and printers.
• The applicable worksheets in Chapter 20:
"Worksheet 16-3270 Attachment Diagram"
"Worksheet 17-ASCII Attachment Diagram"
"Worksheet 18-AEA Configure"
"Worksheet 19-AEA Port Set"
"Worksheet 20-AEA Port to Port Set Map"
"Worksheet 21-AEA Station Set"
"Worksheet 22-AEA Default Destination."
• Documentation supporting the ASCII display stations, printers, and hosts you plan to use or attach (for example, ASCII display station and host setup or cus-tomizing records).
Note: To use the AEA, you need 3174 feature 3020 - AEA microcode on a DSL disk.
You may need to plan for merging DSL code; see Chapter 14, "How to Merge DSL Code."
The following terms are used throughout this chapter.
Connection Menu
A list of all available host connections as defined by station names during customizing. The display station users may select alternate host connections from this list provided they have customized authorization.
AEA Terminal Type Menu
A list of all the available names and terminal types for the port you are currently connected to. Names and terminal types are taken from the station sets defined during customization.
Default Destination
A host to which a terminal or printer is connected when it is ini-tially turned on. If a host is not defined as the default destination for
a
display station, the Connection Menu is displayed.Note: A default destination is required for printers.
Planning for the AEA
ASCII terminal emulation
The ability of a 3270 display station or printer to communicate with an ASCII host using the DEC1 VT100 or IBM 3101 data stream.
3270 terminal emulation
AEA stailon
AEA station set
AEA port set
The ability of an ASCII display station or printer to communicate with an IBM host using the 3270 data stream. Supported displays are listed under "ASCII Display Stations Supported by the AEA" on page 8-7.
A 3270 or ASCII display station, printer, or host that is involved in asynchronous communication through the AEA.
One or more AEA stations with the same attributes, such as:
• Station type (for example, 3270 display station or DEC VT100 display station)
• Default destination (for example, the IBM 3270 host or an ASCII host)
• Flow control, line speed, parity, and various other attributes, described later in this chapter.
Station set names for host stations wi" appear on the connection menu for all devices with AEA access. Station set names for ter-minals will appear in the terminal type menu, provided that more than one station set is defined.
One or more control unit ports that have the same physical charac-teristics such as port type (switched, direct, nonswitched), speed, parity, and so on. A port set supports one or more station sets.
Note: Station sets supported by a port set must have different station types.
Considerations
MLT
Storage
Planning for the AEA
You need to take into consideration Multiple Logical Terminals (ML T) and storage when configuring for the AEA. The following section discusses what should be considered.
MLT is a 3174 function that allows 3270 CUT display stations to access multiple host sessions; these sessions may be to a single IBM host, or to an IBM host and one or more ASCII hosts. Configuring the AEA to support the MLT function requires planning for special station and port set definitions and host access.
If ML T has been configured, 3270 display stations may have as many as five default destinations defined. The default destination configuration (the number and order of default destinations) is specified on a station-set basis; for each default destina-tion configuradestina-tion, you will need to define a stadestina-tion set and associated port set.
If you specify an ASCII host as a default desti nation, the host connection is estab-lished when the display station is turned on; an AEA port supporting that host is dedicated to the display station. In dedicating an AEA port supporting that host, access to that host for other display stations and printers will be limited to the remaining ports supporting that host.
For more information regarding the MLT function, see Chapter 3, "Planning to Configure" and Chapter 4, "Planning for Port Assignment."
The overall storage of the control unit must be sufficient to support the AEA and any other function that you may want configured. Under certain functional config-urations, AEA will be deconfigured during IML if the control unit does not contain sufficient storage to support the AEA and any other functions you have configured.
The "Storage Planning Procedure" on page 3-7 will help you to determine the storage requirements for the AEA and any other functions you are planning to con-figure. (Table 3-1 on page 3-9 contains these storage requirements.) This proce-dure is performed in the second part of the planning process (after the
configuration has been planned).
Planning for the AEA
Overview
The Asynchronous Emulation Adapter (AEA) allows communication between:
• 3270 displays and/or printers to ASCII hosts
• ASCII displays and/or printers to IBM hosts
• ASCII displays and/or printers to ASCII hosts.
Information regarding planning your subsystem to allow communication with ASCII display stations, printers, and hosts can be found in the 3174 Asynchronous Emu-lation Adapter Introduction. That book contains information necessary to coordi-nate all the planning tasks, including site planning and customizing planning.
Planning for customizing the 3174 Subsystem Control Unit to support the Asynchro-nous Emulation Adapter involves:
• Configuring for the AEA
• Specifying what default destinations display stations and printers will have
• Assigning display stations, printers, or hosts to groups called station sets
• Assigning station sets to port sets (a port or group of ports)
• Mapping (assigning) the ports supporting the station sets to the port sets.
The 3174 AEA configuration planning involves grouping devices and ports with similar attributes into sets. This process is used to reduce the amount of informa-tion that would normally have to be keyed in. For example, instead of keying in the information for each display station attached to the control unit, you key in the information once for a group of display stations with the same characteristics.
To group the devices and assign them to sets, you will need specific information about the display stations, printers, and hosts, and the ports they are attached to:
• What types they are (for example, 3270 or ASCII)
• What their characteristics are (for example, the line speed they require)
• Which ports they are attached to
• How they are attached to the control unit
• What host the printers will default to when they areJlJ~ned on
• Whether the display stations will default to a specific
hOSt
s~ssion or the Con-nection Menu when they are turned on (for 3270 display stations when the ML T function has been configured, you will also need to know what additional default destinations must be specified).Using this information, you will be guided through two worksheets: "Worksheet 16-3270 Attachment Diagram" and "Worksheet 17-ASCII Attachment Diagram."
You may have already received completed diagrams; if you have, you may proceed to "Numbering the AEA Station Sets on the Attachment Diagrams" on page 8-25.
Planning for the AEA