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`

`An American National Standard
`IEEE Standards for
`Local Area Networks:
`Carrier Sense Multiple Access with
`Collision Detection (CSMAKD)
`Access Method and
`Physical Layer Specifications
`
`Published by
`The Institute of Electrical and Electronics Engineers, Inc
`
`Distributed in cooperation with
`Wiley-Interscience, a division of John Wiley & Sons, Inc
`
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`IEEE Standards documents are developed within the Technical Commit-
`tees of the IEEE Societies and the Standards Coordinating Committees of the
`IEEE Standards Board. Members of the committees serve voluntarily and
`without compensation. They are not necessarily members of the Institute. The
`standards developed within IEEE represent a consensus of the broad expertise
`on the subject within the Institute as well as those activities outside of IEEE
`which have expressed an interest in participating in the development of the
`standard.
`Use of an IEEE Standard is wholly voluntary. The existence of an IEEE
`Standard does not imply that there are no other ways to produce, test,
`measure, purchase, market, or provide other goods and services related to the
`scope of the IEEE Standard. Futhermore, the viewpoint expressed at the time
`a standard is approved and issued is subject to change brought about through
`developments in the state of the art and comments received from users of the
`standard. Every IEEE Standard is subjected to review at least once every five
`years for revision or reaffirmation. When a document is more than five years
`old, and has not been reaffirmed, it is reasonable to conclude that its contents,
`although still of some value, do not wholly reflect the present state of the art.
`Users are cautioned to check to determine that they have the latest edition of
`any IEEE Standard.
`Comments for revision of IEEE Standards are welcome from any interested
`party, regardless of membership affiliation with IEEE. Suggestions for
`changes in documents should be in the form of a proposed change of text,
`together with appropriate supporting comments.
`Interpretations: Occasionally questions may arise regarding the meaning of
`portions of standards as they relate to specific applications. When the need for
`interpretations is brought to the attention of IEEE, the Institute will initiate
`action to prepare appropriate responses. Since IEEE Standards represent a
`consensus of all concerned interests, it is important to ensure that any
`interpretation has also received the concurrence of a balance of interests. For
`this reason IEEE and the members of its technical committees are not able to
`provide an instant response to interpretation requests except in those cases
`where the matter has previously received formal consideration.
`Comments on standards and requests for interpretations should be
`addressed to:
`
`Secretary, IEEE Standards Board
`345 East 47th Street
`New York, NY 10017
`USA
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`

`ANSI / IEEE
`Std 802.3-1985
`IS0 Draft
`International Standard 8802 / 3
`
`An American National Standard
`IEEE Standards for
`Local Area Networks:
`Carrier Sense Multiple Access with
`Collision Detection (CSMAKD)
`Access Method and
`Physical Layer Specifications
`
`Sponsor
`
`Technical Committee on Computer Communications
`of the
`IEEE Computer Society
`
`Approved June 24, 1983
`IEEE Standards Board
`
`Approved December 21, 19C4
`American National Standards Institute
`
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`This standard has been adopted for U.S. federal government use.
`
`in
`the federal government are contained
`its use within
`Details concerning
`FIPS PUB 107, Local Area Networks: Base Band Carrier Sense Multiple
`Access with Collision Detection Access Method and Physical Layer
`Specifications
`and Link Layer Protocol. For a complete
`list of
`the
`the FEDERAL INFORMATION PR 0 C E S S IN G
`publications available
`in
`STANDARDS series, write to the Standards Processing Coordinator, Institute
`for Computer Sciences and Technology, National Bureau of Standards,
`Gaithersburg, MD 20899, U.S.A.
`
`ORTANT NOTFi Section 9 (Repeater Unit) of this standard is obsolete and
`has been updated in the form of a supplement, ANSIDEEE Std 802.3~-1988,
`available in a combined edition with ANSI/IEEE Std 802.3a-1988, ANSI/IEEE
`Std 802.3b-1988, and ANSI/IEEE Std 802.3e-1988.
`(Copies of
`this
`publication may be obtained from the IEEE Service Center, 445 Hoes Lane, PO
`Box 1331, Piscataway, NJ 08855-1331, by asking for Product N u m b e r
`is revised,
`SHll411.) When ANSI/IEEE Std 802.3-1985
`these supplements
`will be incorporated into the main text.
`
`Fifth Printing
`May 1988
`
`ISBN 0471827495
`
`Library of Congress Catalog Number 8443096
`
`@ Copyright 1985 by
`
`The Institute of Electrical and Electronics Engineers, Inc
`345 East 47th Street, New York, NY 10017 USA
`
`No part of this publication may be reproduced in any form,
`in an electronic retrieval system or otherwise,
`without the prior written permission of the publisher
`
`December 31. 1984
`
`SH09738
`
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`

`Foreword
`
`(This Foreword is not a part of IEEE Std 802.3-1985, Carrier Sense Multiple Access with Colli-
`sion Detection (CSMNCD) Access Method and Physical Layer Specifications.)
`This standard is part of a family of standards for Local Area Networks
`(LANs). The relationship between this standard and other members of the
`family is shown below. (The numbers in the figure refer to IEEE standard
`numbers.)
`
`802.1
`
`DATA LINK LAYER
`
`PHYSICAL LAYER
`
`This family of standards deals with the Physical and Data Link Layers as
`defined by the IS0 Open System Interconnection Reference Model. The access
`standards define three types of media access technologies and associated
`physical media, each appropriate for particurar applications or system
`objectives. The standards defining these technologies are
`(1) IEEE Std 802.3-1985 (IS0 DIS 8802/3), a bus utilizing CSMMCD as the
`access method
`(2) IEEE Std 802.4-1985 (IS0 DIS 8802/4), a bus utilizing token passing as
`the access method
`(3) IEEE Std 802.5-1985 (IS0 DP 8802/5), a ring utilizing token passing as
`the access method
`Other access methods (for example, metropolitan area networks) are under
`investigation. IEEE Std 802.2-1985 (IS0 DIS 8802/2), the Logical Link Control
`standard, is used in conjunction with the medium access standards.
`IEEE P802.1 describes the relationship among these standards and their
`relationship to the IS0 Open System Interconnection Reference Model in
`more detail. This companion document also will contain networking manage
`ment standards and information on internetworking. The reader of this
`standard is urged to become familiar with the complete family of standards.
`
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`The local area network access mechanism specified by this standard may
`include patented matter. The IEEE Standards Office calls attention to the fact
`that it is claimed that the process of the local area network access mechanism
`described throughout this standard is the subject of United States patent
`numbers 4 063 220 and 4 099 024 and corresponding patent of foreign countries
`owned by the Xerox Corporation. Although these patents appear to cover the
`access mechanism subject in this standard, the IEEE takes no position with
`respect to patent validity. The Xerox Corporation has assured the IEEE that it
`is willing to grant a license under these patents on reasonable and nondis-
`criminatory terms and conditions to anyone wishing to obtain such a license.
`The Xerox Corporation’s undertakings in this respect are on file with the
`IEEE Standards Office and the license details may be obtained from the
`Office of General Counsel of Xerox Corporation, whose address is PO
`Box 1600, Stamford, CT 06904, USA.
`
`IS0 Standard
`
`Portions of the text of this standard are the standard IS0 880213, supported
`by the ISO, International Organization for Standardization.
`Some portions of the text of this standard are peculiar to IEEE Std 802.4-
`1984, specifically areas relating to
`(1) References to national standards
`(2) Recommendations and guidelines related to safety concerns
`To avoid duplications of standards the IS0 has not developed a separate
`international standard. Those sections of this standard that are not part of
`the International Standard are prefaced with a note enclosed in braces “I...)”.
`At the time this text was printed, IS0 Standard 8802/2 was a Draft Inter-
`national Standard (DIS).
`
`IEEE Std 802.3-1985
`
`The first edition of the standard defines a 10 Mb/s baseband implementation
`of the Physical Layer using the CSMA/CD access method. It is anticipated
`that future editions of the standard may provide additional implementations
`of the physical layer to support different needs (for example, media, and data
`rates\.
`This standard contains state-of-theart material. The area covered by this
`standard is undergoing evolution. Revisions are anticipated to this standard
`within the next few years to clarify existing material, to correct possible
`errors, and to incorporate new related material.
`Readers wishing to know the state of revisions should contact the 802.3
`Working Group Chairman through
`Secretary,
`IEEE Standards Board
`Institute of Electrical and Electronics Engineers, Inc
`345 East 47th Street
`New York, NY 10017 USA
`
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`The IEEE 802.3 Working Group that developed this standard had the
`following membership during the ballot cycle:
`Donald C . Loughry, Chairman
`Robert S. Printis
`Donald E. Kotas
`Phil L. Arst
`Gary S. Robinson
`William P. Lidinsky
`Robert F. Bridge
`Robert Rosenthal
`Laurie Lindsey
`Charles Brill
`Gary Stephens
`William D. Livingston
`G. J. Clancy
`Daniel P. Stokesbeny
`J. Luque
`John Davidson
`Ken F. Sumner
`Daniel Maltbie
`Ralph DeMent
`Daniel Sze
`Jerry McDowell
`Hank (H. N.) Dorris
`Victor J. Tarassov
`C. Kenneth Miller
`Judith Estrin
`P. E. Wainwright
`Robert L. Morrell
`Richard Fabbri
`Lyle Weiman
`Wendell Nakamine
`Ingrid Fromm
`Hugh E. White
`W. P. Neblett
`Milton C. Harper
`Choa-Ping Wu
`James Nelson
`Bryan Hoover
`Nick Zades
`George D. Jelatis
`Thomas L. Phinney
`MO R Zonoun
`David Potter
`Harold W. Katz
`Individuals who contributed actively in the development of this standard
`throughout its elaboration were:
`Dean Lindsay
`Then. T. Liu
`Robert Moles
`Tony Lauck
`Joseph St. Amand
`Rich Seifert
`Nathan Tobol
`The ECMA TC24 Committee on Communication Protocols also provided
`helpful input in the development of this standard.
`The IEEE 802.3 Working Group acknowledges and appreciates that many
`concepts embodied in this standard are based largely upon the CSMA/CD
`access method earlier described in The Ethernet specification as written jointly
`by individuals from Xerox Corporation, Digital Equipment Corporation, and
`Intel Corporation. Appreciation is also expressed to Robert M. Metcalfe and
`David R. Boggs for their pioneering work in establishing the original concepts.
`When the IEEE Standards Board approved this standard on June 23, 1983,
`it had the following membership:
`
`Mark Townsend
`Roger Van Brunt
`Bo Vicklund
`Chris Wargo
`Richard Williams
`Ron Yara
`
`Juan Bulnes
`Ron Crane
`Dane Elliot
`Alan Flatman
`Maris Graube
`Guy Harkins
`
`James H. Beall, Chairman
`Edward Chelotti, Vice Chairman
`Sava I. Sherr, Secretary
`Donald N. Heirman
`Irvin N. Howell, J r
`Joseph L. Koepfinge?
`Irving Kolodny
`George Konomos
`R. F. Lawrence
`John E. May
`Donald T. Michael*
`
`John P. Riganati
`Frank L. Rose
`Robert W. Seelbach
`Jay A. Stewart
`Clifford 0. Swanson
`Robert E. Weiler
`W. B. Wilkens
`Charles J. Wylie
`
`J. J. Archambault
`John T. Boettger
`J. V. Bonucchi
`&ne Castenschiold
`Edward J. Cohen
`Len S. Corey
`Donald C. Fleckenstein
`Jay Forster
`*Member emeritus
`
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`Contents
`
`SECTION
`1 . Introduction .......................................................
`1.1 Overview ......................................................
`1.1.1 Basic Concepts ..........................................
`1.1.2 Architectural Perspectives ................................
`1.1.3 Layer Interfaces .........................................
`1.1.4 Application Areas .......................................
`1.2 Notation ......................................................
`1.2.1 State Diagram Conventions ..............................
`1.2.2 Service Specification Method and Notation ................
`1.2.3 Physical Layer and Media Notation ......................
`1.2.4 Physical Layer Message Notation ........................
`1.3 References .....................................................
`2 . MAC Service Specification .........................................
`2.1 Scope and Field of Application .................................
`2.2 Overview of the Service ........................................
`2.2.1 General Description of Services Provided by the Layer ....
`2.2.2 Model Used for the Service Specification ..................
`2.2.3 Overview of Interactions .................................
`2.2.4 Basic Services and Options ..............................
`2.3 Detailed Service Specification ...................................
`2.3.1 MA-DATA.request .......................................
`2.3.2 MA-DATA.confirm ......................................
`2.3.3 MA-DATA.indication ....................................
`3 . Media Access Control Frame Structure .............................
`3.1 Overview ......................................................
`3.1.1 MAC Frame Format .....................................
`3.2 Elements of the MAC Frame ...................................
`3.2.1 Preamble Field ..........................................
`3.2.2 Start Frame Delimiter Field ..............................
`3.2.3 Address Fields ...........................................
`3.2.4 Destination Address Field ................................
`3.2.5 Source Address Field ....................................
`3.2.6 Length Field ............................................
`3.2.7 Data and PAD Fields ....................................
`3.2.8 Frame Check Sequence Field .............................
`3.3 Order of Bit Transmission ......................................
`3.4 Invalid MAC Frame ...........................................
`4 . Media Access Control Method ......................................
`4.1 Functional Model of the Media Access Control Method ..........
`4.1.1 Overview ................................................
`IEEE 802 CSMNCD Operation ..........................
`4.1.2
`
`E
`'AGE
`13
`13
`13
`13
`15
`15
`16
`16
`16
`18
`18
`18
`20
`20
`20
`20
`21
`21
`21
`21
`21
`22
`22
`23
`23
`23
`24
`24
`24
`24
`26
`26
`26
`26
`27
`27
`27
`28
`28
`28
`28
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`SECTION
`PAGE
`4.1.3 Relationships to LLC Sublayer and Physical Layer ....... 31
`4.1.4 CSMMCD Access Method Functional Capabilities ........ 32
`4.2 CSMMCD Media Access Control Method Formal
`...................................................
`Specification
`32
`.............................................
`4.2.1 Introduction
`32
`4.2.2 Overview of the Procedural Model ........................
`33
`4.2.3 Frame Transmission Model ..............................
`38
`4.2.4 Frame Reception Model ..................................
`40
`4.2.5 Preamble Generation ....................................
`42
`4.2.6 Start Frame Sequence ...................................
`42
`4.2.7 Global Declarations ......................................
`42
`4.2.8 Frame Transmission .....................................
`45
`4.2.9 Frame Reception ........................................
`50
`4.2.10 Common Procedures .....................................
`52
`4.3 Interfaces to/fiom Adjacent Layers .............................
`53
`4.3.1 Overview ................................................
`53
`4.3.2 Services Provided by the MAC Sublayer .................. 53
`4.3.3 Services Required from the Physical Layer ................ 54
`4.4 Specific Implementations .......................................
`56
`4.4.1 Compatibility Overview ..................................
`56
`4.4.2 Allowable Implementations ..............................
`56
`5 . Network Management .............................................
`57
`6 . PLS Service Specifications .........................................
`57
`6.1 Scope and Field of Application .................................
`57
`6.2 Overview of the Service ........................................
`57
`6.2.1 General Description of Services Provided by the Layer .... 57
`6.2.2 Model Used for the Service Specification .................. 57
`6.2.3 Overview of Interactions .................................
`58
`6.2.4 Basic Services and Options ..............................
`58
`6.3 Detailed Service Specification ...................................
`59
`6.3.1 Peer-To-Peer Service Primitives ...........................
`59
`6.3.2 Sublayer-To-Sublayer Service Primitives ................... 60
`7 . Physical Signaling (PIS) and Attachment Unit Interface (AUI)
`Specifications .....................................................
`61
`7.1 Scope .........................................................
`61
`7.1.1 Definitions ..............................................
`62
`7.1.2 Summary of Major Concepts .............................
`62
`7.1.3 Application ..............................................
`62
`7.1.4 Modes of Operation ......................................
`63
`7.1.5 Allocation of Function ...................................
`63
`7.2 Functional Specification ........................................
`63
`7.2.1 PLS-PMA (DTE-MAU) Interface Protocol ................. 63
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`PAGE
`SECTION
`7.2.2 PLS Interface to MAC and Management Entities ......... 69
`7.2.3 Frame Structure .........................................
`71
`7.2.4 PLS Fundions ..........................................
`72
`7.3 Signal Characteristics ..........................................
`80
`7.3.1 Signal Encoding .........................................
`80
`7.3.2 Signaling Rate ..........................................
`82
`7.3.3 Signaling Levels .........................................
`82
`7.4 Electrical Characteristics .......................................
`82
`7.4.1 Driver Characteristics ....................................
`82
`7.4.2 Receiver Characteristics ..................................
`86
`7.4.3 AUI Cable Characteristics ...............................
`88
`7.5 Functional Description of Interchange Circuits ..................
`90
`7.5.1 General .................................................
`90
`7.5.2 Definition of Interchange Circuits ........................
`90
`7.6 Mechanical Characteristics .....................................
`92
`7.6.1 Definition of Mechanical Interface ........................
`92
`7.6.2 Line Interface Connector .................................
`94
`7.6.3 Connector Pin Assignments ..............................
`95
`8 . Medium Attachment Unit and Baseband Medium Specifications,
`Type 10BASE5 ....................................................
`95
`8.1 Scope .........................................................
`99
`8.1.1 Overview ................................................
`95
`8.1.2 Definitions ..............................................
`97
`8.1.3 Application Perspective: MAU and MEDIUM Objectives ... 98
`99
`8.2 MAU Functional Specifications .................................
`8.2.1 MAU Physical Layer Functions ..........................
`100
`8.2.2 MAU Interface Messages ...............................
`103
`8.2.3 MAU State Diagrams ....................................
`107
`8.3 MAU-Medium Electrical Characteristics .........................
`107
`8.3.1 MAU-to-Coaxial Cable Interface ..........................
`107
`8.3.2 MAU Electrical Characteristics ...........................
`110
`8.3.3 MAU-DTE Electrical Charaderistics ......................
`111
`8.3.4 MAU-DTE Mechanical Connection .......................
`111
`8.4 Characteristics of the Coaxial Cable ............................
`111
`8.4.1 Coaxial Cable Electrical Parameters ......................
`111
`8.4.2 Coaxial Cable Physical Parameters .......................
`113
`8.4.3 Total Segment dc Loop Resistance ........................
`114
`8.5 Coaxial Trunk Cable Connectors ...............................
`114
`8.5.1 Inline Coaxial Extension Connector ......................
`115
`8.5.2 Coaxial Cable Terminator ................................
`115
`8.5.3 MAU-to-Coaxial Cable Connector .........................
`115
`8.6 System Considerations .........................................
`118
`8.6.1 Transmission System Model ..............................
`118
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`SECTION
`PAGE
`8.6.2 Transmission System Requirements ......................
`120
`8.6.3 Labeling ................................................
`122
`8.7 Environmental Specifications ...................................
`122
`8.7.1 Safety Requirements .....................................
`122
`8.7.2 Electromagnetic Environment ............................
`124
`Temperature and Humidity ..............................
`124
`8.7.3
`8.7.4 Regulatory Requirements .................................
`125
`.....................................................
`9 . Repeater Unit
`125
`9.1 Repeater Set and Repeater Unit Specification ................... 125
`Basic Repeater Set Configuration .........................
`125
`9.1.1
`9.1.2 Data Propagation ........................................
`126
`Collision Detection and Jam Generation .................. 127
`9.1.3
`9.1.4 Test Functions ..........................................
`128
`9.2 Repeater Unit State Diagram Input and Output Definitions ...... 128
`10 . Baseband Medium Specifications, Type lOBASE2 ................... 130
`[under consideration]
`11 . Broadband Specification ...........................................
`[under consideration]
`
`130
`
`APPENDIXES
`A Bibliography ......................................................
`B System Guidelines .................................................
`State Diagram. MAC Sublayer .....................................
`C
`
`131
`132
`138
`
`FIGURES
`Fig 1-1
`Fig 1-2
`Fig 1-3
`Fig 2-1
`Fig 3-1
`Fig 3-2
`Fig 4-1
`
`Fig 4-2
`Fig 4-3
`Fig 4-4
`Fig 4-5
`Fig 6-1
`Fig 7-1
`
`Fig 7-2
`Fig 7-3
`
`LAN Standard Relationship to the OS1 Reference Model ......
`State Diagram Notation Example ............................
`Service Primitive Notation ...................................
`Service Specification Relation to the LAN Model ..............
`MAC Frame Format .........................................
`Address Field Format .......................................
`MAC Sublayer Partitioning. Relationship to OS1 Reference
`Model .......................................................
`CSMMCD Media Access Control Functions ..................
`Relationship Among CSMNCD Procedures ..................
`Control Flow Summary ......................................
`Control Flow: MAC Sublayer ................................
`Service Specification Relationship to the LAN Model ..........
`Physical Layer Partitioning. Relationship to OS1 Reference
`Model .......................................................
`Generalized MAU Model .....................................
`PLS Reset and Identify Function .............................
`
`14
`16
`17
`20
`24
`25
`
`29
`29
`35
`36
`37
`58
`
`61
`64
`65
`
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`

`FIGURE
`Fig 7-4
`Fig 7-5
`Fig 7-6
`Fig 7-7
`Fig 7-8
`Fig 7-9
`Fig 7-10
`Fig 7-11
`Fig 7-12
`Fig 7-13
`Fig 7-14
`Fig 7-15
`Fig 7-16
`Fig 7-17
`Fig 7-18
`Fig 7-19
`Fig 7-20
`Fig 8-1
`
`Fig 8-2
`Fig 8-3
`Fig 8-4
`Fig 8-5
`Fig 8-6
`Fig 8-7
`Fig 8-8
`Fig 8-9
`Fig 8-10
`Fig 8-11
`Fig 8-12
`Fig 8-13
`
`Fig 8-14
`Fig 9-1
`Fig 9-2
`Fig 9-3
`Fig 9-4
`Fig 9-5
`TABLES
`Table 1
`Table 2
`
`PAGE
`PLS Mode Function .........................................
`66
`PLS Output Function ........................................
`73
`PLS Input Function .........................................
`74
`PLS Error Sense Function ...................................
`76
`PLS Carrier Sense Function .................................
`77
`Interface Function for MAU with Conditioning ................ 78
`Examples of Manchester Waveforms .........................
`80
`Differential Output Voltage. Loaded ..........................
`83
`Generalized Driver Waveform ................................
`84
`Common Mode Output Voltage ...............................
`85
`Driver Fault Conditions ......................................
`86
`Common Mode Input Test ...................................
`87
`Receiver Fault Conditions ....................................
`88
`Common-Mode Transfer Impedance ..........................
`90
`Connector Locking Posts .....................................
`93
`Connector Slide Latch .......................................
`93
`Connector Hardware and AUI Cable Configuration ........... 94
`Physical Layer Partitioning. Relationship to the IS0 Open
`System Interconnection Reference Model ......................
`96
`Interface Function: Simple MAU without Isolate Capability ... 104
`Interface Function: Simple MAU with Isolate Capability ...... 105
`Jabber Function .............................................
`106
`Recommended Driver Current Signal Levels .................. 108
`Typical Coaxial Trunk Cable Signal Waveform ............... 109
`Maximum Coaxial Cable Transfer Impedance ................ 112
`Coaxial Tap Connector Configuration Concepts ............... 117
`Typical Coaxial Tap Connection Circuit ......................
`117
`Maximum Transmission Path ................................
`118
`Minimal System Configuration ...............................
`119
`Minimal System Configuration Requiring a Repeater Set ...... 119
`An Example of a Large System with Maximum Transmission
`Paths .......................................................
`120
`An Example of a Large Point-to-Point Link System (5140 ns) . . 120
`Repeater Set. Coax-to-Coax Configuration .....................
`125
`Repeater Set. Coax-to-Link Configuration .....................
`127
`Repeater Unit State Diagram ................................
`128
`Collision-Gone State Diagram ...............................
`129
`96 State Diagram ...........................................
`129
`
`Generation of Collision Presence Signal ......................
`101
`Repeater Set and Repeater Unit Specification ................. 130
`
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`
`CISCO 1019
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`
`

`

`An American National Standard
`IEEE Standards for
`Local Area Networks:
`
`Carrier Sense Multiple Access with
`Collision Detection (CSMMCD)
`Access Method and
`Physical Layer Specifications
`
`1. Introduction
`
`1.1 Overview
`
`1.1.1 Basic Concepts. The Carrier Sense Multiple Access with Collision
`Detection (CSMNCD) media access method is the means by which two or
`more stations share a common bus transmission medium. To transmit, a sta-
`tion waits (defers) for a quiet period on the medium (that is, no other station is
`transmitting) and then sends the intended message in bit-serial form. If, after
`initiating a transmission, the message collides with that of another station,
`then each transmitting station intentionally sends a few additional bytes to
`ensure propagation of the collision throughout the system. The station remains
`silent for a random amount of time (backoff) before attempting to transmit
`again. Each aspect of this access method process is specified in detail in
`subsequent sections of this standard.
`This is a comprehensive standard for Local Area Networks employing
`CSMMCD as the access method. This standard is intended to encompass
`several media types and techniques for signal rates from 1 Mb/s to 20 Mb/s.
`This edition of the standard provides the necessary specification and related
`parameter values for a 10 Mb/s baseband implementation. It is expected that
`subsequent editions of this standard will provide similar specifications for
`additional implementations (for example, other data rates and physical media).
`1.1.2 Architectural Perspectives. There are two important ways to view
`local area network design corresponding to
`(1) Architecture, emphasizing the logical divisions of the system and how
`they fit together
`
`13
`
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`

`IEEE
`Std 802.3-1985
`
`LOCAL AREA NETWORKS:
`
`I
`
`os1
`REFERENCE MODEL
`LAYERS
`
`APPLICATION
`
`PRESENTATION
`
`I
`
`TRANSPORT
`
`IEEE 802 IAN
`CSMA/CD
`
`HIGHER LAYERS
`
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`
`DTE
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`PHYSICAL
`
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`= A'TTACHMENT UNIT INTERFACE
`AUI
`MAU = MEDIUM A'TTACHMENT UNIT
`MDI
`= MEDIUM DEPENDENT INTERFACE
`PMA = PHYSICAL MEDIUM A'TTACHMENT
`
`Fig 1-1
`LAN Standard Relationship to the
`OS1 Reference Model
`
`(2) Implementation, emphasizing actual components, their packaging and
`interconnection
`This standard is organized along architectural lines, emphasizing the large
`scale separation of the system into two parts: the Media Access Control
`(MAC) sublayer of the Data Link Layer, and the Physical Layer. These layers
`are intended to correspond closely to the lowest layers of the IS0 Model for
`Open Systems Interconnection (see Fig 1-1). The Logical Link Control (LLC)
`sublayer and MAC sublayer together encompass the functions intended for
`the Data Link Layer as defined in the OS1 model.
`
`1.1.2.1 An architectural organization of the standard has two main
`advantages
`(1) Clarity. A clean overall division of the design along architectural lines
`makes the standard clearer
`(2) FZexibiZity. Segregation of medium-dependent aspects in the Physical
`Layer allows the LLC and MAC sublayers to apply to a family of transmis-
`sion media
`
`14
`
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`
`

`

`CSMMCD
`
`IEEE
`Std 802.3-1985
`
`Partitioning the Data Link Layer allows various media access methods
`within the IEEE 802 family of Local Area Network standards.
`The architectural model is based on a set of interfaces that may be different
`from those emphasized in implementations. One critical aspect of the design
`however shall be addressed largely in terms of the implementation interfaces:
`compatibility.
`
`1.1.2.2 Two important compatibility interfaces are de