ANSI-INCITS-186-1992-R2002.pdf
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1、ANSI INCITS 186-1992 (R2002) (formerly ANSI X3.186-1992 (R1997) for Information Systems Fiber Distributed Data Interface (FDDI) Hybrid Ring Control (HRC) Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=OConnor, Maurice N
2、ot for Resale, 04/29/2007 13:14:21 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/29/2007 13:14:21 MDTNo repr
3、oduction or networking permitted without license from IHS -,-,- ANSI X3.186-1992 American National Standard for Information Systems Fiber Distributed Data Interface (FDDI) Hybrid Ring Control (HRC) Secretariat Computer and Business Equipment Manufacturers Association Approved May 8, 1992 American Na
4、tional Standards Institute, Inc. Abstract The described Hybrid Ring Control standard is intended for use in a high-performance multi-node network providing integrated packet and circuit switching capabilities. This protocol is designed to multiplex FDDI MAC and Circuit Switched Symbols onto fibre op
5、tics or other transmission media over distances greater than several kilometers and at rates of 100 megabits per second and greater. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/29/
6、2007 13:14:21 MDTNo reproduction or networking permitted without license from IHS -,-,- American National Standard Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards develo
7、per. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all vi
8、ews and objections be considered, and that a concerted effort be made toward their resolution. The use of American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchas
9、ing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue
10、 an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be r
11、evised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the
12、American National Standards Institute. CAUTION: The developers of this standard have requested that holders of patents that may be required for the implementation of the standard disclose such patents to the publisher. However, neither the developers nor the publisher have undertaken a patent search
13、 in order to identify which, if any, patents may apply to this standard. As of the date of publication of this standard and following calls for the identification of patents that may be required for the implementation of the standard, no such claims have been made. No further patent search is conduc
14、ted by the developer or publisher in respect to any standard it processes. No representation is made or implied that licenses are not required to avoid infringement in the use of this standard. Published by American National Standards Institute 11 West 42nd Street, New York, New York 10036 Copyright
15、 1993 by Information Technology Industry Council (ITI) All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of ITI, 1250 Eye Street NW, Washington, DC 20005. Printed in the United States of Am
16、erica Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/29/2007 13:14:21 MDTNo reproduction or networking permitted without license from IHS -,-,- Contents Page i Forewordii 1Scope .1 2N
17、ormative references.1 3Definitions.2 4Conventions and abbreviations 6 5General description .7 6HRC services.15 7Facilities32 8Operation 42 Figures 1Structure of FDDI standards.2 2HRC cycle structure.8 3Hybrid mode traffic types9 4Bandwidth management hierarchy11 5Data flow through an FDDI-II Monitor
18、 Station 12 6Data flow through an FDDI-II Non-Monitor Station.13 7Architectural block diagram of the H-mux14 8Architectural block diagram of the I-MAC 16 9H-MUX Cycle structure at 100 Mbps .32 10H-MUX Cycle Header.33 11Example of the interleaving of a Wideband Channel 35 12Example of the sorting of
19、the Wideband Channels.35 13H-MUX Structure .51 14HRC Receive State diagram.53 15WBC Template Filter State diagram54 16HRC Cycle Control State diagram.70 17HRC Cycle Generate State diagram71 18WBC Template Generation State diagram.72 Annexes AExamples of the circuit-switch service class84 BFDDI stati
20、on considerations .92 CIsochronous call control procedures .97 DIsochronous channel security .102 EIsochronous bandwidth management104 FLogical ranking of monitors.106 Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=OCon
21、nor, Maurice Not for Resale, 04/29/2007 13:14:21 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword (This foreword is not part of American National Standard X3.186-1992.) The Fiber Distributed Data Interface (FDDI) is intended for use in a high- performance general pu
22、rpose multi-node network and is designed for efficient operation with a peak data rate of 100 Mbit/s. It uses a Token Ring architecture with optical fiber as the transmission medium. FDDI provides for hundreds of nodes operating over an extent of tens of kilome- ters. Hybrid Ring Control (HRC) is an
23、 enhancement to the basic FDDI. This enhancement, commonly known as FDDI-II, extends the capability of FDDI to handle isochronous data streams at a multiplicity of data rates in addi- tion to the packet traffic carried by the basic FDDI. When the set of basic FDDI standards is completed it will incl
24、ude the fol- lowing standards: (a) A Media Access Control (MAC), which specifies the lower sublayer of the Data Link Layer for FDDI, including the access to the medium, addressing, data checking, and data framing. (b) A Physical Layer Protocol (PHY) which specifies the upper sublayer of the Physical
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