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Course Catalog » JES Curriculum

JES3 Concepts and Commands

9 hours



The JES3 Concepts and Commands course introduces the JES3 subsystem. It describes the JES3 input, main output, and expanded services available, and examines the commands used to start, display, maintain, and shut down the JES3 subsystem.


Operators of JES3 systems and other personnel requiring knowledge of JES3.


Basic knowledge of the MVS system.


After completing this course, the student will be able to:

  • Define the concepts of a JES3 system
  • Recognize the various job stages
  • Recognize the JES3 commands to start, stop, control, and monitor the system
  • Recognize the JES3 commands to control output and printers

Course Content

Introduction to Spooling and JES3

Overview of JES3

Spooling Jobs

Job Control Table

Job Segment Scheduler

JES3 Input Services

Reader Phase

Control Student Processing Phase

Converter Service

Interpreter Service

JES3 Main Services

Main Device Scheduling Setup

Job Setup

Highwater Setup

Verify Queue

Explicit Setup

Fetch Queue

Waitvol Queue

JES3 Output Services

Job Data Set Blocks

Output Service Elements


Sysout Classes

Output Service Queue (WTR)

External Writer Queue (HOLD)


JES3 Expanded Services

Deadline Scheduling

Dependent Job Control

JES3 Networking

Recovery Management

Remote Jobs Processing

JES3 Utilities and Initialization

Hot Start

Local Start

Cold Start

Warm Start

Warm Start with Analysis (WA)

Tape to Printer (TP)

Tape to Tape (TT)

Dump Job (DJ)

Tape Dump (TD)

Tape Label (TL)

JES3 Command Format, Part 1

Introduction to the Command Format

JES3 Command Format, Part 2

Inquire Commands

Job Inquiry Command

Job Output Inquiry Command

Device Inquiry Command

JES3 Command Format, Part 3

Job Modification

Job Output Modification

JES3 Command Format, Part 4

Vary Command

ESA - Changes To JES3 Commands


U Command Parameters

New Default for the OUTPUT Parameter of the *CALL

DJ Command and Some Deleted Commands

A Test on JES3 lessons

Course Catalog » JES Curriculum
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