1、INTERNATIONAL STANDARD ISO/IEC 9314-3 First edition 1990-10-15 Information processing systems - Fibre distributed Data Interface (FDDI) - Part 3: Physical Layer Medium Dependent (PMD) Reference number ISO/IEC 9314-3 : 1990 (E) ISO/IEC 9314-3 : 1990 (E) Contents Page Foreword. vi Introduction. . . .
2、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii 1scope. 1 2 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 Conventions and abbreviations. . . . . . . . . . . . .
3、 . . . . . . . . 5 4.1 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4.2 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 6 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6.1 Ring Overview . . . . . . . . . . .
4、. . . . . . . . . . . . . . . . . . 6 6.2 Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6.1 PMD-to-PHY services. . . . . . . . . . . . . . . . . . . . . . . 10 6.2 PMD-to-SMT services .
5、 . . . . . . . . . . . . . . . . . . . . . 13 7 Media attachment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.1 Media Interface Connector (MIC) . . . . . . . . . . . . . . . 15 7.2 MIC intermateability detail. . . . . . . . . . . . . . . . . . . . 20 8 Media signal interface. . . .
6、. . . . . . . . . . . . . . . . . . . . . . 20 8.1 Active output interface. . . . . . . . . . . . . . . . . . . . . . 20 8.2 Active input interface. . . . . . . . . . . . . . . . . . . . . . . 22 8.3 Station bypass interface . . . . . . . . . . . . . . . . . . . . 23 0 ISO/IEC 1990 All rights reserv
7、ed. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 l CH-1211 Geneve 20 l Switzerlan
8、d Printed in Switzerland ii ISOAEC 9314-3 : 1990 (E) 8.4 Station bypass timing definitions. . . . . . . . . . . . . . . 23 9 interface signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 9.1 Optical Receiver. . . . . . . . . . . . . . . . . . . . . . . . . . . 26 9.2 Optical Trans
9、mitter. . . . . . . . . . . . . . . . . . . . . . . . . 28 10 Cable Plant interface Specification 28 10.1 Cable plant specification . . . . . . . . . . . . . . . . . . . . 28 10.2 Bypassing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 10.3 Connectors and splices. . . . . . . . . .
10、 . . . . . . . . . . . 30 Tables Table 1 Characteristics of active output interface . . . . 21 Table 2 Characteristics of active input interface. . . . . 24 Table 3 Characteristics of station bypass interface. . . 24 Table 4 Summary of assertion and deassertion requirements. . . . . . . . . . . . .
11、. . . . . . . . . . . 28 Table 5 Suggested fibre for a cable plant . . . . . . . . . 29 Table 6 Bandwidth and attenuation values. . . . . . . . . . 29 Figures Figure 1 FDDI links and connections. . 7 Figure 2 FDDI topology example 8 Figure 3 Dual attachment PMD services. . 11 Figure 4 Example of Med
12、ia interface Connector (MIC) plug. . . . . . . . . . . . . . . . . . 15 Figure 5 MIC receptacle - fibreidevice. . 16 Figure 6 MIC receptacle - fibre/fibre . 17 Figure 7 MIC ferrule geometry. 18 Figure 8 Receptacle keying detail. . 19 Figure 9 Source spectral width and centre wavelength requirements
13、. 21 Figure 10 Pulse envelope . 22 . . . III iSO/iEC 9314-3 : 1990 (E) Figure 11 Expanded pulse envelope. . . . . . . . . . . . . . . . 23 Figure 12 Station bypass timing characteristics . 25 Figure 13 Signal detect thresholds and timing 27 Figure 14 Minimum dispersion wavelength and slope limits. 3
14、0 Figure 15 Cable plant example . 31 Annexes Annex A Test methods. . 32 A.1 Active output interface . 32 A.2 Active input interface 33 A.3 Distortion and jitter contributions. . . . . . . . . . . . 33 A.4 Distortion and jitter measurements. 34 A.5 DDJ test pattern for jitter measurements. . 35 Annex
15、 B Optical test procedures 37 Annex C Alternative cable plant usage 38 C.1 Alternative fibre sizes 38 C.2 Theoretical connection losses 38 C.3 Optical bypass switches. . 39 Table C.l Alternative fibre types. 38 Table C.2 Theoretical connection losses for mixed fibre types. . . . . . . . . . . . . .
16、. . . . 38 Table C.3 Summary of loss budget remaining. . 39 Annex D Electrical interface considerations . 40 Figure D.l Test configuration for dc-coupled components. . . . . , . . . . . . . . . . . . . . . . . . 40 Figure D.2 Test configuration for ac-coupled components. . . . . . . . . . . . . . .
17、. . . . . . . . . 41 Annex E Example of system jitter allocation 42 E.l Jitter sources 42 iV iSO/iEC 9314-3 : 1990 (E) E.2 Jitter calculation example . 42 Table E.l System jitter budget example . 43 Annex F Keying considerations 44 F.l Receptacle keying . 44 F.2 Plug keying. . 44 F.3 Cabling systems
18、 45 Annex G Reference non-precision MIC test plug. . 46 Figure G.l Reference non-precision MIC plug . 47 V ISOAEC 9314-3 : 1990 (E) Foreword IS0 (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) together form a system for worldwide standardi
19、zation as a whole. National bodies that are members of IS0 or IEC participate in the develop- ment 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
20、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 ado
21、pted by the joint technical committee are circulated to national bodies for approval before their accep- tance as International Standards. They are approved in accordance with procedures requiring at least 75 % approval by the national bodies voting. International Standard ISO/IEC 9314-3 was prepare
22、d by Joint Technical Committee ISOIIEC JTC 1, Information technology. ISO/IEC 9314-3 consists of the following parts, under the general title lnformationpro- cessing systems - Fibre distributed Data Interface lFDDI1 - Part I: Token Ring Physical Layer Protocol IPHYI - Part 2: Token Ring Media Access
23、 Control MAC - Part 3: Token Ring Physical Layer Medium Dependent (PMDJ Annexes A to G are for information only. Vi ISOAEC 9314-3 : 1990 (El Introduction This part of ISOAEC 9314 on the FDDI token ring physical layer, medium dependent is intended for use in a high-performance multistation network. T
24、his protocol is designed to be effective at 100 Mbit/s using a token ring architecture and fibre optics as the transmission medium over distances of several kilometres in extent. vii INTERNATIONAL STANDARD ISO/IEC 9314-3 : 1990 (E) Information processing systems - Fibre distributed Data Interface (F
25、DDI) - Part 3: Physical Layer Medium Dependent (PMD) 1 scope This part of ISO/IEC 9314 specifies Physical Layer, Medium Dependent (PMD) requirements for the Fibre Distributed Data Interface (FDDI). The FDDI provides a high-bandwidth (100 Mbit/s) general-purpose interconnection among computers and pe
26、ripheral equipment using fibre optics as the transmission medium. The FDDI may be configured to support a sustained transfer rate of approximately 80 Mbit/s (10 Mbyte/s). It may not meet the response time requirements of all unbuffered high-speed devices. The FDDI establishes the connection among ma
27、ny FDDI nodes (stations) distributed over distances of several kilometres in extent. Default values for FDDI were calculated on the basis of 1 000 physical connections and a total fibre path length of 200 km. The FDDI consists of (a) A Physical Layer (PL) which is divided into two sublayers: (1) A P
28、hysical Layer, Medium Dependent (PMD), which provides the digital baseband point-to-point communication between nodes in the FDDI network. PMD shall provide all services necessary to transport a suitably coded digital bit stream from node to node. PMD specifies the point of interconnection requireme
29、nts for conforming FDDI stations and cable plants at both sides of the Media Interface Connector (MIC). PMD includes the following: The optical power budgets for cable plants using 62,5/125 pm fibre optic cables and optical bypass switches. The MIC receptacle mechanical mating requirements including
30、 the keying features. The 62,5/125 pm fibre optic cable requirements. The services provided by PMD to PHY and SMT. (2) A Physical Layer Protocol (PHY), which provides connection between PMD and the Data Link Layer (DLL). PHY establishes clock synchronization with the upstream code-bit data stream an
31、d decodes this incoming code-bit stream into an equivalent symbol stream for use by the higher layers. PHY provides encoding and decoding between data and control indicator symbols and code bits, medium conditioning and initializing, the synchronization of incoming and outgoing code-bit clocks, and
32、the delineation of octet boundaries as required for the transmission of information to or ISO/IEC 9314-3 : 1990 (E) from higher layers. Information to be transmitted on the interface medium is encoded by the PHY into a grouped transmission code. (b) A Data Link Layer (DLL), which controls the access
33、ing of the medium and the generation and verification of frame check sequences to ensure the proper delivery of valid data to the other layers. DLL also concerns itself with the generation and recognition of device addresses and the peer-to-peer associations within the FDDI network. For the purposes
34、 of this part of ISO/IEC 9314, references to DLL are made in terms of the Media Access Control (MAC) entity, which is the lowest sublayer of DLL. (c) A Station Management (SMT)” which provides the control necessary at the node level to manage the processes underway in the various FDDI layers such th
35、at a node may work co-operatively on a ring. SMT provides services such as control of configuration management, fault Isolation and recovery, and scheduling procedures. This part of ISO/IEC 9314 is a supporting document to ISO/IEC 9314-1 which should be read in conjunction with it. The SMT document
36、should be consulted for information pertaining to supported FDDI node and network configurations. ISO/IEC 9314 specifies the Interfaces, functions, and operations necessary to insure interoperability between conforming FDDI implementations. This part of iSO/iEC 9314 is a functional description. Conf
37、orming implementations may employ any design technique which does not violate interoperability. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO/IEC 9314. At the time of publication, the editions indica
38、ted were valid. Ail standards are subject to revision, and parties to agreements based on this part of iSO/iEC 9314 are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and IS0 maintain registers of currently valid Internati
39、onal Standards. IS0 9314-1: 1989, Information processing systems - Fibre Distributed Data Interface (FDD# - Part d Token Ring Physical Layer Protocol (PHY). IS0 9314-2: 1989, lnforma tion processing systems - Fibre Distributed Data Interface (FDD) - Part 2: Token Ring Media Access Control (MAC). 3 D
40、efinitions For the purposes of this part of ISO/IEC 9314, the following definitions apply. Other parts of ISO/iEC 9314, e.g., MAC and PHY, may contain additional definitions of interest. 3.1 attenuatlon: Level of optical power loss, expressed in decibels. 3.2 average power: The optical power measure
41、d using an average reading power meter when the FDDI station is transmitting a stream of Halt symbols. 1 SMT will form the subject of a future part of ISO/IEC 9314. 2 iSO/IEC 9314-3 : 1990 (E) 3.3 bypass: The ability of a station to isolate itself optically from the FDDI network while maintaining th
42、e continuity of the cable plant. 3.4 centre wavelength: The average of the two wavelengths measured at the half amplitude points of the power spectrum. 3.5 code bit: The smallest signailing element used by the Physical Layer for transmission on the medium. 3.6 concentrator: An FDDI node that has add
43、itional PHY/PMD entities beyond those required for its own attachment to an FDDI network. These additional PHY/PMD entities are for the attachment of other FDDI nodes (including other concentrators) in a tree topology. 3.7 connector plug: A device used to terminate an optical conductor(s) cable. 3.8
44、 connector receptacle: The fixed or stationary half of a connection that is mounted on a panel/bulkhead. Receptacles mate with plugs. 3.9 counter-rotating: An arrangement whereby two signal paths, one in each direction, exist in a ring topology. 3.10 dual attachment concentrator: A concentrator that
45、 offers two attachments to the FDDI network which are capable of accommodating a dual (counter-rotating) ring. 3.11 dual attachment station: A station that offers two attachments to the FDDI network which are capable of accommodating a dual (counter-rotating) ring. 3.12 dual ring (FDDI dual ring): A
46、 pair of counter-rotating logical rings. 3.13 entity: An active service or management element within an Open Systems interconnection (OSI) layer, or sublayer. 3.14 extinction ratio: The ratio of the low, or off optical power level (PL) to the high, or on optical power level (PH) when the station is
47、transmitting a stream of Halt symbols. Extinction ratio (%) = (PL/PH) x 100 3.15 fibre: Dielectric material that guides light; waveguide. 3.16 flbre optic cable: A cable containing one or more optical fibres. 3.17 Interchannel Isolation: The ability to prevent undesired optical energy from appearing
48、 in one signal path as a result of coupling from another signal path; cross talk. 3.18 jitter, data dependent (DDJ): Jitter that is related to the transmitted symbol sequence. DDJ is caused by the limited bandwidth characteristics and imperfections in the optical channel components. DDJ results from
49、 non-ideal individual pulse responses and from variation in the average value of the encoded pulse sequence which may cause base-line wander and may change the sampling threshold level in the receiver. 3.19 jitter, duty cycle distortion (DCD): Distortion usually caused by propagation delay differences between low-to-high and high-to-low transitions. DCD is manifested as a pulse width distortion of the nominal baud time. 3 iSO/iEC 9314-3 : 1990 (E) 3.20 jitter, random (RJ): RJ is due to thermal noise and may be modelled as a Gaussian process. The peak-peak value of RJ is of a probabilistic nat
