REMOTE JOB ENTRY

Overview

The remote job entry (RJE) support of JES2 allows remote facilities to use the job entry subsystem. JES2 processes remote jobs no differently than it does those received from local readers, printers, and punches.

This chapter describes the characteristics of the remote devices supported by JES2 and the RMT generation for generating remote terminal processor (RTP) programs (including the parameters used and the processing of the generation). Some aspects of remote operations are also included in this chapter; for example, starting remote job entry and disconnecting remote lines.

Remote job entry is the ability to submit jobs and receive system output at remote facilities as if the jobs had been submitted at a local facility. JES2 supports both SNA (systems network architecture) and BSC (binary synchronouseommunication) remote stations as RJE facilities. The remote facilities may be attached to JES2 by synchronous data link control (SDLC) or by a (point-to-point) BSC communication link. The remote facility becomes a logical extension of the local computer facility and is expected by JES2 to be under the control of a person called a remote operator.

There are two types of remote job entry stations. The first type is the remote terminal, that does not have a CPU. A remote terminal, for example, a 2780 or 2770, can be used for entering jobs into and receiving data from JES2. The second type is a remote work station that does have a CPU. A processor, for example, System/3 or System/370, executes a JES2 generated program that allows the processor to send jobs to and receive data from JES2. Also part of the work station are printers, punches, card readers, and a console. A remote work station is established by a JES2 program, RMTGEN, during system generation or later. See "RMT Generation" below for a description of the procedure and parameters used. A remote station is a composite term for a remote terminal and a remote work station.

Reading, printing, and punching between the CPU and the remote terminal take place one action at a time. For example, it is either transmitting print data or transmitting punch data or reading an input stream. The remote operator may influence the order of these events. A discussion of how this is done is presented laterin this section under, "Altering the Sequence of Operations from a Remote Terminal."

SNA RJE Considerations: Remote job entry stations that use the facilities of an SNA network gain access to JES2 through VTAM. During VTAM system definition, these RJE stations (for example, the 3770 terminals and the System/32 workstation) are defined to VT AM as logical units (LUs) and physical units (PUs) by means of the VT AM LU and PU definition statements, respectively. The installation must decide at VTAM system definition how to tailor the JES2/VT AM support for its SNA stations, because the parameters of the LU and PU statements affect not only how JES2 operates, but also how the remote operator uses the station.

Some of the LU parameters affect both the logon syntax and the handling of logon requests. For example, the installation can specify an interpret table (with the LOGTAB parameter) to use in assigning an alias for the JES2 application ID, or specify a table to use in generating a logon sequence (with the USSTAB parameter). The SSCPFM parameter allows the installation to specify whether the terminal supports formatted or

unformatted system services. Other LU parameters affect the VT AM session with JES2.

For a description of what these parameters specify and how to code the LU definition statement, refer to OS/VS2 MVS System Programming Library: VTAM.

The DISCNT parameter of the PU definition statement affects the disconnecting of the teleprocessing link. OS/VS2 System Programming Library: VTAM also describes this definition statement.

Note: JES2 is concerned only with the RJE lines, which are the logical connections between JES2 and VTAM. The teleprocessing links (the physical connections) are transparent to JES2; they are managed exclusively by VTAM and the NCP.

During the JES2 initialization procedure, the system programmer defines other characteristics of the SNA RJE stations and their JES2/VTAM support. The initialization parameter &NUMLNES includes the number of logical lines defined to JES2;

&NUMTPBF includes the number of buffers required for stations supported by VT AM;

and &TPBFSIZ includes the largest buffer specified for SNA stations. The initialization parameter LOGONI identifies JES2 as an application program to VTAM.

The system programmer also defines the remote stations and the lines that the stations use. Each SNA RJE station is defined by means of an RMTnnn initialization parameter with the subparameter LUTYPEI. LUTYPEI indicates· to JES2 that it can communicate with the station only through a logical line. A logical line is defined by a LINEnnn initialization parameter with the subparameter UNIT=SNA specified.

The system programmer does not specify the CONSOLE subparameter with the RMTnnn parameter because all SNA RJE stations support console input and output. JES2 messages to the remote operator are sent to the console only between the times when data sets are outbound and when no inbound data sets are being transmitted. This timing arrangement is used so that console messages do not become interspersed in printed output when the console printer is not a separate printer in the station. When a separate console printer is available, all messages to the operator are routed to that printer.

BSC RJE Considerations: Communication between the locru CPU and BSC remote work stations uses a JES2 facility called MULTI-LEAVING that allows multiple print and punch streams to be transmitted at the same time and multiple console messages and input streams to be received by JES2. With MULTI-LEAVING, you can have several operations going simultaneously. Operators at remote terminals and at work stations that have no console can enter commands into the input stream in the normal manner.

Command replies will be scheduled back to the remote station for printing on a remote printer.

JES2 provides remote station MULTI-LEAVING support for the following programmable work stations:

IBM System/360 Model 20, Submodels 2, 4, 5, and 6 and the 2922 with the following selectable options:

1403 Printer

144 2 Card Read Punch 2152 Printer-Keyboard 2203 Printer

2501 Card Reader

2520 Card Read Punch

2560 Multi-Function Card Machine

IBM System/360 Models 22 and up and System/370 Models 115, 125, 135, 145, 155, 158,165,168, and 195 with the following selectable options:

1052 Printer-Keyboard 1403 Printer

1442 Card Read Punch 1443 Printer

2501 Card Reader 2520 Card Read Punch 2540 Card Read Punch 3203 Printer

3210/3215 Console Printer-Keyboard (supported as a 1052) 3211 Printer

3504 Card Reader (sl:lpported as a 2501) 3505 Card Reader (supported as a 2501) 3525 Card Punch (supported as a 1442) 5203 Printer

5313 Console for the Model 125 (requires 1052 compatibility feature).

(Note: System/370 RMS support is not provided.) IBM 1130 System with the following selectable options:

1132 Printer 1403 Printer

1442 Card Read Punch 144 2 Card Punch 2501 Card Reader

Standard Printer-Keyboard

IBM System/3 Model 10 with the following selectable options:

1442 Card Read Punch 5203 Printer

5424 Multi-Function Card Unit 54 71Prin ter-Keyboard 5475 Data Entry Keyboard

For Both SNA and BSC RJE Stations: Remote lines can be configured as dedicated or nondedicated. This configuration is established during initialization when the remote stations are specified. If the station parameter, RMTnnn, designates a line number, the line is dedicated to that station. If two or more RMTnnn parameters specify the same line, the stations corresponding to those parameters must contend for use of that line.

lines that are not pointed to by a station parameter at initialization are nondedicated lines and are eligible to be dynamically connected to any nondedicated station.