rfc1759.txt

著名的RFC文档,其中有一些文档是已经翻译成中文的的.

Network Working Group                                           R. Smith
Request for Comments: 1759                             Texas Instruments
Category: Standards Track                                      F. Wright
                                                   Lexmark International
                                                             T. Hastings
                                                       Xerox Corporation
                                                               S. Zilles
                                                     Adobe Systems, Inc.
                                                           J. Gyllenskog
                                                 Hewlett-Packard Company
                                                              March 1995

                              Printer MIB

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Table of Contents

   1. Introduction ................................................    3
   1.1 Network Printing Environment ...............................    3
   1.2 Printer Device Overview ....................................    4
   1.3 Categories of Printer Information ..........................    5
   1.3.1 Descriptions .............................................    5
   1.3.2 Status ...................................................    5
   1.3.3 Alerts ...................................................    5
   2. Printer Model ...............................................    6
   2.1 Overview of the Printer Model ..............................    8
   2.2 Printer Sub-Units ..........................................    8
   2.2.1 General Printer ..........................................    8
   2.2.2 Inputs ...................................................    9
   2.2.3 Media ....................................................    9
   2.2.4 Outputs ..................................................    9
   2.2.5 Finishers ................................................   10
   2.2.6 Markers ..................................................   10
   2.2.7 Media Paths ..............................................   11
   2.2.8 System Controller ........................................   11
   2.2.9 Interfaces ...............................................   11
   2.2.10 Channels ................................................   12
   2.2.11 Interpreters ............................................   12
   2.2.12 Console .................................................   12
   2.2.13 Alerts ..................................................   13
   2.2.13.1 Status and Alerts .....................................   13



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   2.2.13.2 Overall Printer Status ................................   13
   2.2.13.2.1 Host MIB Printer Status .............................   15
   2.2.13.2.2 Sub-unit Status .....................................   17
   2.2.13.3 Alert Tables ..........................................   18
   2.2.13.4 Alert Table Management ................................   19
   2.3 Read-Write Objects .........................................   20
   2.4 Enumerations ...............................................   22
   2.4.1 Registering Additional Enumerated Values .................   22
   3. Objects from other MIB Specifications .......................   22
   3.1 System Group objects .......................................   22
   3.2 System Controller ..........................................   23
   3.3 Interface Group objects ....................................   23
   4. Textual Conventions .........................................   23
   5. The General Printer Group ...................................   27
   5.1 The Cover Table ............................................   30
   5.2 The Localization Table .....................................   31
   5.3 The System Resources Tables ................................   33
   6. The Responsible Party group .................................   35
   7. The Input Group .............................................   35
   8. The Extended Input Group ....................................   41
   9. The Input Media Group .......................................   42
   10. The Output Group ...........................................   44
   11. The Extended Output Group ..................................   48
   12. The Output Dimensions Group ................................   49
   13. The Output Features Group ..................................   51
   14. The Marker Group ...........................................   52
   15. The Marker Supplies Group ..................................   58
   16. The Marker Colorant Group ..................................   62
   17. The Media Path Group .......................................   64
   18. The Channel Group ..........................................   68
   18.1 The Channel Table and its underlying structure ............   69
   18.2 The Channel Table .........................................   70
   19. The Interpreter Group ......................................   73
   20. The Console Group ..........................................   81
   20.1 The Display Buffer Table ..................................   82
   20.2 The Console Light Table ...................................   83
   21. The Alerts Group ...........................................   85
   21.1 The Alert Time Group ......................................   92
   22. Appendix A - Glossary of Terms .............................   98
   23. Appendix B - Media Size Names ..............................  101
   24. Appendix C - Media Names ...................................  103
   25. Appendix D - Roles of Users ................................  107
   26. Appendix E - Participants ..................................  111
   27. Security Considerations ....................................  113
   28. Authors' Addresses .........................................  113






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1.  Introduction

1.1.  Network Printing Environment

   The management of producing a printed document, in any computer
   environment, is a complex subject. Basically, the task can be divided
   into two overlapping pieces, the management of printing and the
   management of the printer. Printing encompasses the entire process of
   producing a printed document from generation of the file to be
   printed, selection of a printer, choosing printing properties,
   routing, queuing, resource management, scheduling, and final printing
   including notifying the user.  Most of the printing process is outside
   the scope of the model presented here; only the management of the
   printer is covered.





































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               Figure 1 - One Printer's View of the Network

    system   printer    asset     user          user           user
    manager  operator   manager
      O         O         O         O             O              O
     /|\       /|\       /|\       /|\           /|\            /|\
     / \       / \       / \       / \           / \            / \
      |         |         |         |             |              |
+---------+ +-------+ +-------+ +-------+   +-----------+ +-----------+
|configur-| |printer| | asset | |printer|   |   user    | |   user    |
|ator     | |manager| |manager| |browser|   |application| |application|
+---------+ +-------+ +-------+ +-------+   +-----------+ +-----------+
   ^            ^         ^         ^             |             |
   |R/W         |R/W      |R        |R      +-----------+ +-----------+
   |            |         |         |       |  spooler  | |  spooler  |
   |            |         |         |       +-----------+ +-----------+
   |            |         |         |             |             |
   |            |         |         |       +-----------+ +-----------+
   |            |         |         |       |supervisor | |supervisor |
   |            |         |         |       +-----------+ +-----------+
   |            |         |         |        ^       ^     ^       ^
   |            |         |         |        |R      |R/W  |R      |R/W
   v            v         |         |        |       |     |       |
==================================================   |   =====     |
                     |                          print|        print|
                     |SNMP                       data|         data|
  +-----+        +-------+                        PCL|          PCL|
  | MIB |<------>| agent |                 PostScript|   PostScript|
  +-----+        +-------+                       NPAP|         NPAP|
                     |unspecified                etc.|         etc.|
              +=============+  +-----------------+   |             |
              |             |--|channel/interface|<--+             |
              |             |  +-----------------+                 |
              |   PRINTER   |                                      |
              |             |  +-----------------+                 |
              |             |--|channel/interface|<----------------+
              +=============+  +-----------------+

1.2.  Printer Device Overview

   A printer is the physical device that takes media from an input
   source, produces marks on that media according to some page
   description or page control language and puts the result in some
   output destination, possibly with finishing applied. Printers are
   complex devices that consume supplies, produce waste and have
   mechanical problems. In the management of the physical printing
   device the description, status and alert information concerning the
   printer and its various subparts has to be made available to the



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   management application so that it can be reported to the end user,
   key operators for the replenishment of supplies or the repair or
   maintenance of the device. The information needed in the management
   of the physical printer and the management of a printing job overlap
   highly and many of the tasks in each management area require the same
   or similar information.

1.3.  Categories of Printer Information

   Information about printers is classified into three basic categories,
   descriptions, status and alerts.

1.3.1.  Descriptions

   Descriptions convey information about the configuration and
   capabilities of the printer and its various sub-units. This
   information is largely static information and does not generally
   change during the operation of the system but may change as the
   printer is repaired, reconfigured or upgraded. The descriptions are
   one part of the visible state of the printer where state means the
   condition of being of the printer at any point in time.

1.3.2.  Status

   Status is the information regarding the current operating state of
   the printer and its various sub-units. Status is the rest of the
   visible state of the printer. As an example of the use of status, a
   management application must be able to determine if the various sub-
   units are ready to print or are in some state that prevents printing
   or may prevent printing in the future.

1.3.3.  Alerts

   An Alert is the representation of a reportable event in the printer.
   An event is a change in the state of the printer. Some of those state
   changes are of interest to a management application and are therefore
   reportable. Typically, these are the events that affect the printer's
   ability to print. Alerts usually occur asynchronously to the
   operation of the computer system(s) to which the printer is attached.
   For convenience below, "alert" will be used for both the event caused
   by a change in the printer's state and for the representation of that
   event.

   Alerts can be classified into two basic categories, critical and
   non-critical.  A critical alert is one that is triggered by entry
   into a state in which the printer is stopped and printing can not
   continue until the condition that caused critical alert is
   eliminated. "Out of paper", "toner empty" and "output bin full" are



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   examples of critical alerts. Non-critical alerts are triggered by
   those events that enter a state in which printing is not stopped.
   Such a non-critical state may, at some future time, lead to a state
   in which printing may be stopped.  Examples of this kind of non-
   critical alerts are "input media low", "toner low" and "output bin
   nearly full". Or, a non-critical alert may simply provide
   information, such as signaling a configuration changed in the
   printer.

   Description, status and alert information about printer can be
   thought of as a data base describing the printer. The management
   application for a printer will want to view the printer data base
   differently depending on how and for what purposes the information in
   the data base is needed.