1、ANSI INCITS 278-1997 (R2002)(formerly ANSI X3.278-1997)for Information Technology Fibre Distributed Data Interface (FDDI) Physical Layer Repeater Protocol(PHY-REP)ANSIX3.278-1997American National Standardfor Information Technology Fibre Distributed Data Interface (FDDI) Physical Layer Repeater Proto
2、col (PHY-REP)SecretariatInformation Technology Industry CouncilApproved February 6, 1997American National Standards Institute, Inc.AbstractThis standard is intended for use in a high-performance multi-node network. This protocol isdesigned to be effective at 100 megabits per second using a token rin
3、g architecture and fibreoptics or other transmission media over distances of several kilometers in extent.AmericanNationalStandardApproval of an American National Standard requires review by ANSI that therequirements for due process, consensus, and other criteria for approval havebeen met by the sta
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13、use of this standard.Published byAmerican National Standards Institute11 West 42nd Street, New York, New York 10036Copyright 1997 by Information Technology Industry Council (ITI)All rights reserved.No part of this publication may be reproduced in anyform, in an electronic retrieval system or otherwi
14、se,without prior written permission of ITI, 1250 Eye Street NW,Washington, DC 20005.Printed in the United States of AmericaiForeword .ii1 Scope 12 Normative references .23 Definitions34 Conventions and abbreviations.54.1 Conventions .54.2 Abbreviations .65 General description 76 Services.86.1 PHY-to
15、-PHY services .96.1.1 PH_UNITDATA.request 96.1.2 PH_UNITDATA.indication.96.1.3 PH_INVALID.indication.106.2 PHY-to-PMD services.106.3 PHY-to-SMT control services106.3.1 SM_PH_CONTROL.request107 Facilities 117.1 Coding .117.2 Symbol set .117.3 Line states .11(7.3.1 through 7.3.6 can be found in PHY-2)
16、7.3.7 Noise Line State (NLS).128 Operation .12(8.1 through 8.6 can be found in PHY-2)8.7 Line State Detection function 12(8.8 can be found in PHY-2)8.9 Repeat Filter function .138.9.1 State RF0: IDLE 148.9.2 State RF1: REPEAT 148.9.3 State RF2: FILTER 15Figures1 Structure of FDDI repeaters22 Peer Ph
17、ysical Connection example.86 Repeat Filter state diagram.16Contents1)Page1)The clauses, subclauses, and figures are numbered to match the correspondingclauses, subclauses, and figures in the PHY-2 document.iiForeword (This foreword is not part of American National Standard X3.278-1997.)The Fibre Dis
18、tributed Data Interface (FDDI) is intended for use in a high-performance general purpose multi-node network and is designed for effi-cient operation with a peak data rate of 100 Mbit/s. It uses a Token Ringarchitecture with optical fibre as the transmission medium. FDDI providesfor hundreds of nodes
19、 operating over an extent of tens of kilometers.The Physical Layer Repeater Protocol (PHY-REP) specifies the upper sub-layer of the Physical Layer for the FDDI. As such, it presents the specifica-tions and services provided for conforming FDDI attachment devices.PHY-REP specification provides additi
20、onal requirements beyond those ofthe PHY protocol.When the set of basic FDDI standards is completed it will also include thefollowing standards:a) A Media Access Control (MAC), which specifies the lower sublayer ofthe Data Link Layer for FDDI, including the access to the medium,addressing, data chec
21、king, and data framing;b) A set of Physical Layer Media Dependent (PMD), which specify thelower sublayer of the Physical Layer for FDDI, including the power lev-els and characteristics of the optical transmitter and receiver, interfaceoptical signal requirements including jitter, the connector recep
22、taclefootprint, the requirements of conforming FDDI optical fibre and twistedpair cable plants, and the permissible bit error rates.c) A Station Management (SMT), which specifies the local portion of thesystem management application process for FDDI, including the controlrequired for proper operatio
23、n of a node in an FDDI ring. SMT providesservices such as connection management, station insertion andremoval, station initialization, configuration management, fault isolationand recovery, communications protocol for external authority, schedul-ing policies, and collection of statistics.d) A Physic
24、al Layer Protocol (PHY), which specifies the upper sublayerof the Physical Layer for FDDI, including specification for the dataencode/decode, framing, and clocking requirements. It also specifiesthe elasticity buffer, smoothing, and repeat filter functions.As of this writing, American National Stand
25、ards for PHY (ANSI X3.148-1988), MAC (ANSI X3.139-1987), PMD (ANSI X3.166-1990), and SMT(ANSI X3.229-1994) have been approved. In addition, FDDI standards arebeing processed as International Standards by standards committeeISO/IEC JTC 1/SC 25. International Standards for PHY, MAC, and PMD(ISO 9314-1
26、: 1989, 9314-2: 1989 and ISO/IEC 9314-3: 1990, respectively)have been published and the standard for SMT is now in process, asISO/IEC DIS 9314-6.Two extensions to the basic FDDI are also in print. The first (ANSI X3.186-1992), for Hybrid Ring Control (HRC), commonly known as FDDI-II, extendsthe capa
27、bility of FDDI to handle isochronous data streams at a multiplicity ofdata rates. The second (ANSI X3.184-1993), for a single mode optical fibreversion of PMD (SMF-PMD), permits optical links of up to 60 km.Alternate PMDs for low-cost attachments in concentrator-to-workstation environ-ments are LCF-
28、PMD (ANSI X3.237-1995) and TP-PMD (ANSI X3.263-1995).iiiThe text and format of this document is based on ISO 9314-1: 1989. As aconsequence, certain conventions, references, spelling, and units com-monly used in International Standards have been used in this FDDI stan-dard. These may be different tha
29、n those normally used in AmericanNational Standards, but careful attention to the definitions and conventionsshould avoid difficulty in understanding or use.Requests for interpretation, suggestions for improvement or addenda, ordefect reports are welcome. They should be sent to the NationalCommittee
30、 for Information Technology Standards (NCITS), ITI, 1250 EyeStreet, NW, Suite 200, Washington, DC 20005.This standard was processed and approved for submittal to ANSI byNCITS. Committee approval of this standard does not necessarily implythat all committee members voted for its approval. At the time
31、 it approvedthis standard, NCITS had the following members:James D. Converse, ChairKaren Higginbottom, Vice-ChairKate McMillan, SecretaryOrganization Represented Name of RepresentativeAMP, Inc. .Ben BennettEdward Kelly (Alt.)Apple Computer, Inc. David K. MichaelJerry Kellenbenz (Alt.)AT however, the
32、 FDDI protocols can support much largernetworks by increasing these parameter values.As shown in figure 1, an FDDI repeater consists of:a) A Physical Layer (PL), which is divided into two sublayers:1) A Physical Medium Dependent (PMD), which provides the digital baseband point-to-pointcommunication
33、between nodes in the FDDI network. The PMD provides all services necessaryto transport a suitably coded digital bit stream from node to node. The PMD defines andcharacterizes the fibre-optic drivers and receivers, medium-dependent code requirements,cables, connectors, power budgets, optical bypass p
34、rovisions, and physical-hardware-relatedcharacteristics. It specifies the point of interconnectability for conforming FDDI attachments.The initial PMD standard defines attachment to multi-mode fibre. Alternative PMD sublayerstandards are defined for attachment to other transmission media.2) A Physic
35、al Layer Repeater Protocol (PHY-REP), which provides PMD to PMD connectivity.PHY-REP provides the necessary modifications to the PHY standard (ANSI X3.148-1988) forrepeating the signal from one PMD to another. The definition of PHY-REP is contained in thisstandard.b) A Station Management (SMT), whic
36、h provides management access to the Physical layers. Thisentity allows the repeater to be reset and controlled by a node processor.The definition of PHY-REP as contained in this standard is designed to be as independent as possiblefrom the actual physical medium.Implementations that conform to this
37、standard shall also be interoperable with implementations thatconform to ISO 9314-1: 1989 (ANSI X3.148-1988 and X3.284-1994) if the additional capability of Hybridmode operation (as defined in this document) is not being used. Implementers are encouraged to readISO 9314-1 or ISO 9314-7 in addition t
38、o this standard.The set of FDDI standards specifies the interfaces, functions, and operations necessary to ensureinteroperability between conforming FDDI implementations. This FDDI standard on PHY-REP is aANSI X3.278-19972functional description. Conforming implementations may employ any design techn
39、ique that isinteroperable.Figures 3 through 5 can be found in the PHY-2 (ISO 9314-7) (ANSI X3.231-1994). Clause and figurenumbering is consistent with the PHY-2 document to maintain consistency between the affected sectionsof the PHY protocol.Figure 1 Structure of FDDI repeaters2 Normative reference
40、sThe following standards contain provisions which, through reference in this text, constitute provisions ofthis American National Standard. At the time of publication, the editions indicated were valid. Allstandards are subject to revision, and parties to agreements based on this American National S
41、tandardare encouraged to investigate the possibility of applying the most recent editions of the standards listedbelow. Members of IEC and ISO maintain registers of currently valid inernational standards.Copies of the following documents can be obtained from ANSI: Approved ANSI standards, approved a
42、nddraft international and regional standards (ISO, IEC, CEN/CENELEC, ITU-T), and approved foreignstandards (including BSI, JIS, and DIN). For further information, contact ANSI Customer ServiceDepartment at 212-642-4900 (phone), 212-302-1286 (fax) or via the World Wide Web athttp:/www.ansi.org.The de
43、signations for the equivalent American National Standards are provided in brackets.ISO 9314-1: 1989, Information processing systems Fibre Distributed Data Interface (FDDI) Part 1:Token Ring Physical Layer Protocol (PHY) ANSI X3.148-19882)ISO 9314-2: 1989, Information processing systems Fibre Distrib
44、uted Data Interface (FDDI) Part 2:Token Ring Media Access Control (MAC) ANSI X3.139-19872)ISO 9314-3: 1990, Information processing systems Fibre Distributed Data Interface (FDDI) Part 3:Token Ring Physical Layer, Medium Dependent (PMD) ANSI X3.166-19902)ISO DIS 9314-4, Information processing systems
45、 Fibre Distributed Data Interface (FDDI) Part 4: TokenRing Single Mode Fibre Physical Layer, Medium Dependent (SMF-PMD) ANSI X3.184-19932)2)All American National Standards and International Standards are available from the American National StandardsInstitute, 11 West 42nd Street, New York, NY 10036
46、.ANSI X3.278-19973ISO/IEC 9314-5: 1995, Information technology Fibre Distributed Data Interface (FDDI) Part 5: HybridRing Control (HRC) ANSI X3.186-19922)ISO DIS 9314-6, Information processing systems Fibre Distributed Data Interface (FDDI) Part 6:Token Ring Station Management (SMT) ANSI X3.229-1994
47、2)ISO DIS 9314-7, Infomation processing systems Fibre Distributed Data Interface (FDDI) Part 7:Token Ring Physical Layer Protocol (PHY-2) ANSI X3.231-19942)ISO DIS 9314-8, Information processing systems Fibre Distributed Data Interface (FDDI) Part 8:Token Ring Media Access Control (MAC-2) ANSI X3.23
48、9-19942)ISO CD 9314-9, Information processing systems Fibre Distributed Data Interface (FDDI) Part 9:Token Ring Low Cost Fiber Physical Layer, Medium Dependent (LCF-PMD) ANSI X3.237-19952)ISO CD 9314-10, Information processing systems Fibre Distributed Data Interface (FDDI) Part 10:Token Ring Twiste
49、d Pair Physical Layer, Medium Dependent (TP-PMD) ANSI X3.263-19952)3 DefinitionsFor the purposes of this FDDI standard on PHY-REP, the following definitions apply:3.1 basic mode: The mode of ring operation where MAC PDUs (frames and tokens) are directlytransmitted by PHY.3.2 byte: A pair of symbols on an even-symbol boundary.3.3 code bit: The smallest signalling element used by the Physical Layer for transmission on themedium.3.4 code group: A Protocol Data Unit transmitted between cooperating PHY entities on a Physical
