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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
25、 Layer for the FDDI, including the specifications and services provided for conforming FDDI attachment devices. PHY specifies the data encode/decode, framing, and clocking requirements. PHY also specifies the elasticity buffer, smoothing, and repeat filter functions. (c) A Physical Layer Media Depen
26、dent (PMD), which specifies the lower sublayer of the Physical Layer for FDDI, including the power levels and characteristics of the optical transmitter and receiver, interface optical sig- nal requirements including jitter, the connector receptacle footprint, the requirements of conforming FDDI opt
27、ical fiber cable plants, and the per- missible bit error rates. (d) A Station Management (SMT), which specifies the local portion of the system management application process for FDDI, including the control required for proper operation of a node in an FDDI ring. SMT provides ser- vices such as conn
28、ection management, station insertion and removal, sta- tion initialization, configuration management, fault isolation and recovery, communications protocol for external authority, scheduling policies, and collection of statistics. As of this writing, American National standards for PHY (ANSI X3.148-
29、 1988), MAC (ANSI X3.139-1987), and PMD (ANSI X3.166-1990) have been approved and published, whereas the standard for SMT (ANSI X3.229-199x) is in still in process. In addition, FDDI standards are being processed as International Standards by standards committee ISO/IEC JTC1/SC 25. International Sta
30、ndards for PHY, MAC, and PMD (ISO 9314- 1:1989, 9314-2:1989 and ISO/IEC 9314-3:1990, respectively) have been published while a standard for SMT (ISO/IEC 9314-6:199x) is now in pro- cess, In addition to HRC, another extension to the basic FDDI is also in process. This extension (ANSI X3.184-199x), is
31、 for a single mode optical fiber ver- sion of PMD (SMF-PMD), will permit optical links of up to 60 km. This has been approved as American National Standard and is now in the process of being published. ii Copyright American National Standards Institute Provided by IHS under license with ANSI License
32、e=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/29/2007 13:14:21 MDTNo reproduction or networking permitted without license from IHS -,-,- iii Other work currently in process, addressing alternate PMDs, is aimed at providing low-cost attachments for use in concentrator-to-workst
33、ation envi- ronments and for direct attachment to SONET links. The use of HRC requires the use of enhanced versions of MAC, PHY and SMT, designated MAC-2, PHY-2 and SMT-2, respectively. Each of these three enhanced standards is required to be interoperable with the corre- sponding basic standard whe
34、n FDDI is operating in basic mode. The dpANS for PHY-2 and MAC-2 were balloted by X3T9.5 in December 1990. Both received extensive comments on this ballot. These comments have been resolved and PHY-2 (ANSI X3.231-199x) and MAC-2 (ANSI X3.239-199x) were approved for forwarding to X3 for approval by t
35、he June 1991 and December 1992 X3T9 meetings, respectively. In addition to the changes required to support HRC, these documents include miscellaneous editorial corrections and technical clarifications, and in the case of MAC-2, the changes to support MAC bridging. SMT-2 has been divided into three d
36、ocuments, SMT-2-CS (Common Services), SMT-2-PS (Packet Services) and SMT-2-IS (Isochronous Services). The first two of these are based on SMT and provide the same services, whereas SMT-2-IS is a entirely new document to support the isochronous services provided by HRC. A standards project for HRC wa
37、s first formally proposed at the June 1985 X3T9.5 meeting and was subsequently approved as project 573D. The technical work on HRC was done in a series of ad hoc working meetings authorized by X3T9.5 that are collectively referred to as the FDDI-II work- ing meetings. The early work of the FDDI-II w
38、orking group was document- ed in an FDDI-II working paper that was subsequently converted to the HRC dpANS. HRC was first approved for forwarding to X3 for approval by the April 1989 X3T9 meeting. The first public review of HRC was completed in January 1990 with the only comments being those submitt
39、ed by the FDDI-II working group. The second X3 public review was completed with no comments and the first X3 letter ballot closed in December 1990 with the only com- ment (on a YES ballot) being one submitted on behalf of the FDDI-II work- ing group The June 1991 meeting of X3T9 approved this versio
40、n of HRC, which is being published as a standard, for forwarding to X3 for approval. An International Standard for HRC (ISO/IEC 9314-5-199x) is also in pro- cess and has been approved for publishing. There are minor editorial dif- ferences between it and this standard on HRC. This standard contains
41、six informative annexes. These annexes are for information only, and are not considered to be a part of the standard. This standard was processed and approved for submittal to ANSI by Accredited Standards Committee on Information Processing Systems, X3. Committee approval of this standard does not n
42、ecessarily imply that all committee members voted for its approval. At the time it approved this standard, the X3 committee had the following members: Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=IHS Employees/1111111001, User=OConnor, Maurice Not
43、for Resale, 04/29/2007 13:14:21 MDTNo reproduction or networking permitted without license from IHS -,-,- iv Richard Gibson, Chair Donald C. Loughry, Vice-Chair Joanne Flanagan, Administrative Secretary Organization RepresentedName of Representative Allen-Bradley CompanyRonald H. Reimer Joe Lenner (
44、Alt.) American Library Association.Paul Peters American Nuclear SocietyGeraldine C. Main Sally Hartzell (Alt.) AMP, Inc. Edward Kelly Edward Mikoski (Alt.) Apple Computer, IncKaren Higginbottom Association of the Institute for Certification of Computer Professionals Kenneth Zemrowski Eugene M. Dwyer
45、 (Alt.) AT MAC or MAC-2 otherwise. PHY-2 with HRC; PHY or PHY-2 otherwise. PMD, SMF_PMD, TP-PMD or LCF-PMD. Figure 1 Structure of FDDI standards 2) At the time of publication, this standard was under development. Contact the seCretariat for more recent information. Copyright American National Standa
46、rds 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 -,-,- ANSI X3.186-1992 3.2Channel: The term “channel” is a synonym for “transmission
47、channel”. 3.3Circuit: A circuit is a bidirectional communications capability provided over a continuous isochronous channel(s) between two or more CS-MUX level entities. 3.4Circuit switching: Circuit switching is the service that provides and manages a set of circuits. 3.5Circuit Switching Multiplex
48、er (CS-MUX): A CS-MUX multiplexes and demultiplexes cir- cuits onto Transmission Channels for transmission. 3.6Connection: A connection is a concatenation of circuits and other functional units set up to provide for the transfer of signals between two or more points in a telecommunications network. 3.7Cycle: The cycle is the HRC frame. It has a duration of 125 microseconds and nominally carries 3 120 symbols at 100 Mbps. 3.8Cycle Control field: The Cycle Control field is a two symbol field in the Cycle Header. One symbol is for synchroniza