ISO/IEC 8802-4:1990
(Main)Information processing systems — Local area networks — Part 4: Token-passing bus access method and physical layer specifications
Information processing systems — Local area networks — Part 4: Token-passing bus access method and physical layer specifications
Systèmes de traitement de l'information — Réseaux locaux — Partie 4: Spécification pour la méthode d'accès et la couche physique relatives au bus à passage de jeton
General Information
Standards Content (Sample)
INTERNATIONAL
Isa/I EC
STANDARD
8802-4
ANSI/IEEE
Std 802.4
First edition
1990-08- 17
Information processing systems -
Local area networks -
Part 4 :
Token-passing bus access method and physical layer
specifications
Syst&mes de traitement de l’information - Mseaux locaux -
Partie 4 : Sptkification pour la m&hode d’acc&s et la couche physique relatives au
bus 8 passage de jeton
Reference number
ISO/IEC 8802-4 : 1990 (E)
ANSI/IEEE
Std 802.4-1990
---------------------- Page: 1 ----------------------
Abstract: This Local Area Network (LAN) standard, ISO/IEC 8802-4 : 1990 [IEEE Std 802.4-19901,
deals with all elements of the token-passing bus access method and its associated physical signaling
and media technologies. To facilitate interconnection of stations by way of a LAN using the token-
passing bus access method, this standard specifies the characteristics of the transmission medium;
the signaling method used; the frame formats transmitted; the actions of a station upon receipt of a
frame; the services provided at the conceptual interface between the Medium Access Control (MAC)
sublayer and the Logical Link Control (LLC) sublayer; and the actions, entities, and values used by
management. There are four medium characteristics and signaling methods: 5 and 10 Mb/s phase-
coherent FSK; 1, 5, and 10 Mb/s broadband; 10 and 20 Mb/s fiber optic; and 1 Mb/s phase-
continuous FSK.
First Printing
ISBN l-55937-027-0
Library of Congress Catalog Card Number go-082603
Copyright @ 1990 by
The Institute of Electrical and Electronics Engineers, Inc.
345 East 47th Street, New York, NY 10017-2394, USA
No part of this publication may be reproduced in any fomz,
in an electronic retrieval system or otherwise,
without the prior written permtision of the publisher.
August 17, 1990 SH12LW8
---------------------- Page: 2 ----------------------
International Standard ISO/IEC 8802-4 : 1990
ANSI/IEEE Std 802.4-1990
(Revision of ANSI/IEEE Std 802.4-1985)
Information processing systems -
Local area networks -
Part 4:
Token-passing bus access method and
physical layer specifications 1
Sponsor
, Technical Committee on Computer Communications
of the
IEEE Computer Society
Approved February 27, 1990
IEEE Standards Board
Approved July 19, 1990
American National Standards Institute
Approved 1990 by the
International Organization for Standardization
and by the
International Electrotechnical Commission
Adopted as an International Standard by the
-
- International Organization for Standardization
Electrotechnical Commission
---------------------- Page: 3 ----------------------
International Standard ISO/IEC 8802-4 : 1990
IS0 (the International Organization for Standardization) and IEC (the Interna-
tional Electrotechnical Commission) together form a system for worldwide stan-
dardization as a whole. National bodies that are members of IS0 or IEC participate
in the development of International Standards through technical committees
established by the respective organization to deal with particular fields of technical
activity. IS0 and IEC technical committees collaborate in fields of mutual interest.
Other international organizations, governmental and non-governmental, in liaison
with IS0 and IEC, also take part in the work.
In the field of information technology, IS0 and IEC have established a joint
technical committee, ISO/IEC JTC 1. Draft International Standards adopted by the
joint technical committee are circulated to the national bodies for approval before
their acceptance as International Standards. They are approved in accordance
with procedures requiring at least 75% approval by the national bodies voting.
In 1985, IEEE Std 802.4-1985 was adopted by IS0 Technical Committee 97,
Information processing systems, as draft International Standard ISO/DIS 8802-4.
A further revision was subsequently approved by ISO/IEC JTC 1 in the form of this
new edition, which is published as International Standard ISO/IEC 8802-4: 1990.
For the purpose of assigning global addresses, the Institute of Electrical and
Electronics Engineers, Inc., USA, has been designated by the IS0 Council as the
Registration Authority. Communications on this subject should be addressed to
Registration Authority for ISO/IEC 8802-4
c/o The Institute of Electrical and Electronics Engineers, Inc.
445 Hoes Lane
P.O. Box 1331
Piscataway, NJ 08855-1331
USA
International Organization for Standardization/International Electrotechnical Commission
Case postale 56 l CH-12 11 Genke 20 l Switzerland
---------------------- Page: 4 ----------------------
Foreword to International Standard ISO/IEC 88024 : 1990
This standard is part of a family of standards for Local Area Networks (LANs).
The relationship between this standard and the other members of the family is
shown below. (The numbers in the figure refer to IS0 Standard numbers.)
8802-2
I I
DATA
LINK
LAYER
-m------
PHYSICAL
8802-3
L4YER
n
This family of standards deals with the physical and data link layers as defined
by the IS0 Open Systems Interconnection Reference Model (IS0 7498 : 1984). The
access standards define four types of medium access technologies and associated
physical media, each appropriate for particular applications or system objectives.
The standards defining these technologies are
(1) IS0 8802-3 [IEEE Std 802.3-19881, a bus utilizing CSMA/CD as the access
method,
(2) ISO/IEC 8802-4 [IEEE Std 802.4-19901, a bus utilizing token passing as the
access method,
(3) IS0 8802-7, a ring utilizing slotted ring as the access method.
IS0 8802-2 [IEEE Std 802.2-19891, Logical Link Control protocol, is used in
conjunction with the medium access standards.
The reader of this document is urged to become familiar with the complete
family of standards.
The main body of this standard serves for both the ISO/IEC 8802-4 : 1990 and
IEEE 802.4-1990 standards, except for portions that specifically state that they are
not a part of the ISO/IEC standard. Such portions apply to the IEEE standard only.
ISO/IEC and IEEE each have unique foreword sections. The Appendixes serve as
useful reference material to both standards.
---------------------- Page: 5 ----------------------
IEEE Std 802.4-1990
IEEE Standards documents are developed within the Technical Committees 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 welI 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. Furthermore, 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 re-
affirmation. When a document is more than five years old, and has not been
reaffirmed, it is reasonable to conclude that its contents, although sti.lI 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
445 Hoes Lane, PO. Box 1331
Piscataway, NJ 08855-1331
USA
IEEE Standards documents are adopted by the Institute of Electrical and
Electronics Engineers without regard to whether their adoption may involve
patents on articles, materials, or processes. Such adoptions does not assume any
liability to any patent owner, nor does it assume any obligation whatever to
parties adopting the standards documents.
---------------------- Page: 6 ----------------------
Summary of Changes
This standard is a major revision of IEEE Std 802.4-1985 (ISO/DIS 8802/4). This
revision incorporates the results of over four years of work by the IEEE 802.4
Working Group and by other organizations.
This section of the Foreword summarizes the changes for the reader’s con-
venience.
The management sections, Sections 3 and 9, have been completely rewritten.
These revised sections are now in conformance with the work of the IEEE 802
Committee and in alignment, to the extent possible, with other groups working on
management standards.
The access control machine (ACM), the heart of the Medium Access Control
(MAC) protocol, has been revised. Errors and ambiguities that existed in the pre-
vious version were corrected, and enhancements were made to improve error
recovery. The intention in revising the ACM was to retain complete interoperability
with the ACM described by the previous standard. We believe that intention has
been realized.
The name of the request-with-response option has been changed from “imme-
diate response” option to avoid conflicts with other uses of the phrase immediate
response (see 6.1.1 and 6.6.2).
Additional MAC Capabilities (6.7) has been added to give implementors sugges-
tions for providing extra MAC features and to give guidance to conformance
testers.
The specification of an interface within the Physical Layer for a separate modem
has been included as Section 10.
Section 11 has been reserved to retain compatible section numbers and for
future additions.
The phase-coherent FSK Physical Layer and medium, described in Sections 12
and 13, underwent revision. Based on implementation experience, the working
group found it necessary to make substantive technical changes to the standard.
The transmit and receive levels were changed, the preamble pattern and length
were changed, and a receiver blanking specification was added. The result of these
changes is that the implementations of this revised standard will not interoperate
with implementations of the previous standard.
The broadband Physical Layer and medium, described in Sections 14 and 15,
underwent minor revisions to clarify the specification and to provide guidance for
conformance testing.
A fiber optic Physical Layer and medium specification has been added as Sec-
tions 16 and 17.
The 1 Mb/s phase-continuous FSK Physical Layer and medium specification was
moved from Sections 10 and 11 to Sections 18 and 19, to avoid renumbering the
more commonly referenced Physical Layer and media sections. The coding of the
end delimiter coding pattern was changed to increase the reliability (Hamming
distance) of the protocol.
---------------------- Page: 7 ----------------------
Foreword to IEEE Std 802.4-1990
(Revision of IEEE Std 802.4-1985)
(This Foreword is not a part of ISO/IEC 8802-4 : 1990 or of IEEE Std 802.4-1990.)
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
802.2
DATA LINK LAYER
.* *.-.a.*.- -.-.-.
.*
.:.:.:.:.::*.:.:.
:*
.‘.*.*.:.:::.:.-
.:.:.‘.:.:.*.*.’
-m .::.:ri;t:-;-;i.:: -m
.‘.:.*:.;.:.:.:
:.-:*.
1:. *. ,.‘.:.‘.:.‘.
:::.‘::.::::::::::’
:::::: .:.‘.:::.:::
.* *.-
.*.* ::
. . . .:. . .
:. a-*. .
. . .-
802.3 i;o2 *::.:i 4 802.5
. .-.
::::.:.::i:.:p
::::.*.:::.
.:I:.::
::::::i:.*.-.
. .*.*.:*: PHYSICAL LAYER
-.-:*.*.-.*.*.*.*.
:i:::.:::.:::p.:.
.
..:.:::.:;:::.:::i:.
‘.‘.-.:. .*.-.a. .:
0
II
This family of standards deals with the physical and data link layers as defined
by the IS0 Open Systems Interconnection Basic Reference Model (IS0 7498 : 1984).
The access standards define three types of medium access technologies and asso-
ciated physical media, each appropriate for particular applications or system
objectives. The standards defining these technologies are
(1) IEEE Std 802.3-1988 [ISO 8802-31, a bus utilizing CSMA/CD as the access
method,
(2) IEEE Std 802.4-1990 [ISO/IEC 8802-41, a bus utilizing token passing as the
access method,
(3) IEEE Std 802.5-1989, a ring utilizing token passing as the access method.
Other access methods (for example, metropolitan area networks and integrated
voice-data networks) are under investigation.
IEEE Std 802.2-1989 [ISO 8802-21, the Logical Link Control standard, is used in
conjunction with the medium access standards.
IEEE 802.1 1 (a series of related standards) describes the relationship among the
family of 802 standards and their relationship to the IS0 Open Systems Inter-
connection Basic Reference Model in more detail. IEEE 802.1 will also contain
networking management standards and information on internetworking.
The reader of this standard is urged to become familiar with the complete family
of standards.
’ IEEE Std 802.1A-1990, Overview and Architecture of Network Standards; IEEE Std 802.lD-1990,
MAC (Media Access Control) Bridges; and IEEE Std 802.13-1990, System Load Protocol have been
approved as IEEE Standards, but are not yet published. Other projects in the 802.1 series are currently
under development.
---------------------- Page: 8 ----------------------
This standard was submitted to ISO/IEC JTCl for consideration as a revision
and addendum to the previous edition of the token bus LAN standard, IEEE Std
802.4-1985 (ISO/DIS 8802/4). To facilitate processing of that document, portions
that were not appropriate for an international standard were prefaced with a note
enclosed in braces (. . . 1.
These same portions contained within the current edition are not a part of the
International Standard and are stated as such. These portions are peculiar to the
IEEE version of this standard and consist of areas relating to
(1) References to national standards
(2) Recommended frequency allocations for North American CATV systems (see
14.8.4)
(3) Recommendations and guidelines related to safety concerns
This standard contains state-of-the-art material. The area covered by this stan-
dard is undergoing evolution. Revisions to this standard may occur either to clarify
existing material, to correct possible errors, or to incorporate new, related
material.
Readers wishing to know the state of revisions should contact the
Secretary, IEEE Standards Board
445 Hoes Lane, P.O. Box 1331
Piscataway, NJ 08855-1331, USA
The following were voting members of the IEEE 802.4 Token-Passing Bus Access
Method Working Group at the time of approval of this standard:
Paul S. Eastman, Chair Louis F. Wojnaroski, Vice Chair
Rhonda Alexis-Dirvin, Secretary
Ernest E. Bergmann Gerhard Hammer Toshio Ogawa
Clyde A. Boenke Richard F. Hunter Ilan Pardo
Shalom Bresticker Dittmar Janetzky Michael J. Perkins
Charles Brill Lawrence R. Johnson Thomas L. Phinney
Mike Bukowski Walter Kammerer Fred Rhine
Mike Bush Bradford S. Kellar David W. Riley
Hsin-Hwai Chen Robert W. Kilgore Ken Ross
Jade Y. Chien William H. Kind Chandos A. Rypinski
Robert S. Crowder Michael T. Klein Toshio Saito
C. David Daly Simon Korotwitz Walter Schreuer
Sanjay Dhawan Leonid Koshevoy Rich Seifert
H. N. “Hank” Dorris Detlev Leisengang Yehuda Shvager
Robert H. Douglas Daniel N. LeBlanc Daniel P. Stokesberry
Daniel Dove Bruce A. Loyer Orest Lev Storoshchuk
Richard B. Formeister Wayne A. Mack Catherine F. Summers
Anatoly V. Fridland Charles H. March Chuck Thurwachter
Darrell Furlong Gunther J. Martin Lourens Van Der Jagt
T. R. (Tom) Gandhi Michael A. Masleid Earl J. Whitaker
Maris Graube Stephen G. McChrystal Roger Wilmarth
David J. Greenstein Dale D. Murry Yong W. Yi
David L. Nicholson
---------------------- Page: 9 ----------------------
Special thanks to the following task group chairmen whose task groups contrib-
uted to this revision:
-
Donald J. Loughxy
802.4A, Broadband
-
Michael T. Klein
802.4B, Carrier Band
- Robert H. Douglas
802.4C, MAC Management
Michael J. Perkins
802.4D, Physical Management -
-
Louis F. Wojnaroski
802.4F, MAC Revision
-
Richard M. Collins
and past Chair
- Clyde A. Boenke
802.4G, DTE-DCE Interface
- Robert S. Crowder
802.4H, Fiber Optic Media
802.45, Conformance Testing - Paul S. Eastman
-
Robert L. Husak (deceased)
and past Chair
Special thanks to our past chairman, 1983-87, under whose guidance we devel-
oped the current draft and reached committee consensus:
Robert II. Douglas, past Chair
The following persons were on the balloting committee that approved this doc-
ument for submission to the IEEE Standards Board:
Robert S. Printis
G. Juanloe
William B. Adams
Keith Alan Rhodes
S. L. Junker
J. Ashok
John Riganati
M. Kezunovic
Kit Athul
G. Robinson
Samuel Kho
William E. Ayen
D. J. Rypka
T. M. Kurihara
Ali Bahrololoomi
S. I. Samoylenko
Anthony B. Lake
Michael Benedek
George Sanderson
Mike Lawler
Peter I. P. Boulton
Ambatipudi R. Sastry
E. Y. Lee
G. S. Carson
N. F. Schneidewind
Sateesh B. Lele
Chih-Tsai Chen
D. A. Sheppard
F. C. Lim
Lap Yan Cheung
Steve Showalter
R. S. Little
Kilnam Chon
L. Sintonen
William Livingston
Michael H. Coden
Ing Alex Soceanu
Donald C. Loughry
A. F. Conrad
H. P. Solomon
J. F. P. Luhukay
R. A. Conser
Robert K. Southhard
Wo-Shun Luk
Richard J. Corley
John Spragins
Andy J. Luque
Robert S. Crowder
T. Stack
George Mattathil
Andrew I. Davidson
Michael J. Stephenson
P. S. McIntosh
R. T. Denton
C. M. Stillebroer
Gilbert Melanson
M. G. Duncan
F. J. Strauss
David S. Millman
Paul Eastman
P. Sugar
John E. Montague
John E. Emrich
E. D. Sykas
Luis F. M. de Moraes
Philip H. Enslow
A. N. Tantawi
M. A. F. Morganti
J. W. Fendrich
Nathan Tobol
Kinji Mori
Harold Folts
Wei-Tek Tsai
David Morris
Harvey A. Freeman
L. D. Umbaugh
Steven Moustakas
Patrick S. Gonia
Thomas A. Varetoni
Gerry Nadler
Julio Gonzalez-Sanz
J. T. Vorhies
R. R. Nelson
Maris Graube
Donald F. Weir
Arne A. Nilsson
Stephen Harris
WiIliam J. Wenker
J. D. Northcutt
J. Scott Haugdahl
Earl J. Whitaker
C. Oestereicher
Anne B. Horton
Michael WiIlett
Chris Hsieh Young Oh
David Wood
Ari Ollikainen
Richard J. Iliff
George B. Wright
Raj Jain Thomas L. Phinney
Oren Yuen
Rafat Pirzada
Duncan P. Johnson
Udo Pooch
---------------------- Page: 10 ----------------------
The final conditions for approval of this standard were met on February 27,
1990. This standard was conditionally approved by the IEEE Standards Board on
February 15, 1990, with the following membership:
Marco W. Migliaro, Chair
James M. Daly, vice Chair
Andrew G. Salem, Secretary
Paul L. Borrill Kenneth D. Hendrix L. Bruce McClung
Fletcher J. Buckley John W. Horch Donald T. Michael*
Allen L. Clapp Joseph L. Koepfinger * Stig Nilsson \
Stephen R. Dillon Michael A. Lawler Roy T. Oishi
Donald C. Fleckenstein Donald C. Loughry Gary S. Robinson
Jay Forster * John E. May, Jr. Terry R. Whittemore
Thomas L. Hannan Lawrence V. McCall Donald W. Zipse
*Member Emeritus
---------------------- Page: 11 ----------------------
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---------------------- Page: 12 ----------------------
Contents
PAGE
SECTION
1. Introduction and Overview . 17
1.1 Scope . . 18
.1.2 Definitions . . . . 18
1.3 References . . 18
1.4 Conformance . . 20
1.5 Overview of the Token Method. . 20
1.6 MAC Sublayer Internal Structure . . 22
..............
1.7 PLE and Medium . .2 . 23
1.8 Access Method Characteristics . ’ 28
1.9 Standard Organization . . . .t. ’ . . . . . . . . . . . . . . . . . . . . . . . . 29
2. LLC-MAC Interface Service Specifications . . 31
31
2.1 Overview of the LLC-MAC Service .
32
2.2 Detailed Interactions with the LLC Entity .
35
3. MAC Sublayer Management .
36
3.1 Overview . .
................ ..................... 36
3.2 MAC Management Facilities
........... 43
4. Frame Formats .
............. 44
4.1 Frame Components .
50
4.2 Enumeration of Frame Types .
Recommendation for a Hierarchical Structure for
4.3 Appendix -
52
Locally Administered Addresses .
55
5. Elements of MAC Sublayer Operation .
....................... 56
5.1 Basic Operation .
64
5.2 Access Control Machine (ACM) States. .
Interface Machine (IFM) Description . 70
5.3
Receive Machine (RxM) Description . 71
5.4
Transmit Machine (TxM) Description . . 75
5.5
Regenerative Repeater Machine (RRM) Description . 75
5.6
6. MAC Sublayer Definitions and Requirements . 77
6.1 MAC Definitions . . 77
6.2 Transmission Order. . . 78
6.3 Delay Labeling 80
.................................................
6.4 Miscellaneous Requirements . 80
6.5 Use of Address Bits in Contention Algorithms . 82
6.6 Options within MAC Sublayer. . 83
6.7 Additional MAC Capabilities . 84
6.8 Delegation of Right to Transmit . 86
7. Access Control Machine (ACM) Description. . 87
7.1 Variables and Functions . 87
7.2 Access Control Machine (ACM) Formal Description. . 97
---------------------- Page: 13 ----------------------
PAGE
SECTION
. . . . . . . . . 133
8. MAC Sublayer-Physical Layer Interface Service Specification . .
133
. . . . . . . . . . . . . . . . .
81 . Overview of the LAN Physical Layer Service. . . .
134
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
82 . DetaiIed Specifications
9. Physical Layer.Entity (PLE) Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
140
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
91 . Overview . . . . . . . . . . . .
92 . Physical Management Facilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
93 . Additional Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
145
........................................
10. Exposed DTE-DCE Interface
............................... 146
10.1 Overview of DTE-DCE Interface.
........................ 146
PIIY-UNITDATA Request and Indication
10.2
............................................
149
DCE Management
10.3
......................................
156
10.4 Electrical Characteristics
160
....................................
10.5 Mechanical Characteristics
.................
164
Clarification of Management Mode
10.6 Appendix-
167
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11. RESERVED . . . . . . . . . .
... 169
12. Single-Channel Phase-Coherent-FSK Bus Physical Layer Entity (PLE)
................................................
170
12.1 Nomenclature
.............................................. 171
12.2 Object .
..................................
171
12.3 Compatibility Considerations
171
................................. ...........
12.4 Medium Overview
................................................
171
12.5 PLE Overview
...................................
173
12.6 Application of Management
............ 173
12.7 Functional, Electrical, and Mechanical Specifications
..................................
18 1
12.8 Environmental Specifications
181
12.9 Labeling .
183
.....................
13. Single-Channel Phase-Coherent-FSK Bus Medium
................................................
184
13.1 Nomenclature
185
13.2 Object .
185
..................................
13.3 Compatibility Considerations
185
....................................................
13.4 Overview
............
186
Functional, Electrical, and Mechanical Specifications
13.5
189
..................................
13.6 Environmental Specifications
190
.......................
13.7 Transmission-path-delay Considerations
...............................................
190
Documentation
13.8
............................................... 190
13.9 Network Sizing
191
.............
13.10 Appendix- Guidelines for Configuring the Medium
..........................
195
14. Broadband Bus Physical Layer Entity (PLE)
196
14.1 Nomenclature .
....................................................... 197
14.2 Object
197
..................................
14.3 Compatibility Considerations
..................
198
14.4 Operational Overview of Single-Cable Medium.
198
..................
14.5 Operational Overview of a Dual-Cable Medium
---------------------- Page: 14 ----------------------
SECTION
PAGE
14.6 General Overview.
................ ............................ 199
14.7 Application of Management
.......... ................ ......... 201
14.8 Functional, Electrical, and Mechanical Specifications
............ 201
14.9 Environmental Specifications
...................... ............ 215
14.10 Labeling .
......... .................... ............ 216
14.11 Appendix - Provisions of Two MAC-Symbol/PHY-Symbol
Signaling . .
................... 216
14.12 Appendix -Detailed Scrambling and Descrambling Process
...... 220
15. Broadband Bus Medium
.......................
..................... 221
15.1 Nomenclature
....... ................... ......................
222
15.2 Object
........................... ............
................ 224
15.3 Compability Considerations
......... ...............
........... 224
15.4 Overview
................ ....................................
224
15.5 Functional, Electrical, and Mechanical Specifications
226
............
15.6 Environmental Specifications
................... ...............
228
15.7 Transmission path delay Considerations
............ ...........
229
15.8 Documentation . .y
....... ................. ........ ..........
229
15.9 Network Sizing
..................... ................ ..........
229
16. Fiber Optic Physical Layer Entity (PLE)
................... ........... 231
16.1 Nomenclature
................... .................. ........... 232
16.2 Object
.............................. ........... ..............
234
16.3 Compatibility Considerations
............... ............... .... 234
16.4 Operational Overview .
................... ........... 235
16.5 Physical Layer Overview .
.................... ....... 235
16.6 Application of Management
................................... 236
16.7 Functional, Optical, Electrical, and Mechanical Specifications.
236
....
16.8 Environmental Specifications
..............................
.... 242
16.9 Labeling
..................................................... 242
16.10 Appendix
-Alternative Fiber Optic Medium
.................... 243
16.11 Appendix
-Comparison of Parameter Values of Standard and
Alternative Fiber Optic Medium.
...............................
244
17. Fiber Optic Medium
....... ................ ...............
.......... 245
17.1 Nomenclature
................... ....................
......... 246
17.2 Object
................................ ...............
........ 248
17.3 Compatibility Considerations
..................................
248
17.4 Overview
.......... ............ ..........................
.... 249
17.5 Functional, Optical, and Mechanical Specifications
..............
249
17.6 Safety Requirements
............ .................. ............
...
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