1、ANSI INCITS 255-1996 (R2001)(formerly ANSI X3.255-1996 (R2001)for Information Technology Fibre DistributedData Interface (FDDI) Abstract Test Suite for FDDIPhysical Medium DependentConformance Testing(PMD ATS)ANSI X3.255-l 996 American National Standard for Information Technology- Fibre Distributed
2、Data Interface (FDDI) - Abstract Test Suite for FDDI Physical Medium Dependent Conformance Testing(PMD ATS) Secretariat Information Technology Industry Council Approved March 22, 1996 American National Standards Institute, Inc. Abstract Conformance tests are specified to test an FDDI Physical Layer
3、Medium Dependent (PMD) entity. FDDI is a set of standards that defines a 100-Mbps token ring architecture and uses fiber optics as the transmission medium over distances of several kilometers in extent. AmericanNationalStandardApproval of an American National Standard requires review by ANSI that th
4、erequirements for due process, consensus, and other criteria for approval havebeen met by the standards developer.Consensus is established when, in the judgment of the ANSI Board of StandardsReview, substantial agreement has been reached by directly and materiallyaffected interests. Substantial agre
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7、 of any American National Standard.Moreover, no person shall have the right or authority to issue an interpretation ofan American National Standard in the name of the American National StandardsInstitute. Requests for interpretations should be addressed to the secretariat orsponsor whose name appear
8、s on the title page of this standard.CAUTION NOTICE: This American National Standard may be revised orwithdrawn at any time. The procedures of the American National StandardsInstitute require that action be taken periodically to reaffirm, revise, or withdrawthis standard. Purchasers of American Nati
9、onal Standards may receive currentinformation on all standards by calling or writing the American National StandardsInstitute.CAUTION: The developers of this standard have requested that holders of patents that may be required for theimplementation of the standard disclose such patents to the publis
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11、nof the standard, no such claims have been made. No further patent search is conducted by the developer or publisher inrespect to any standard it processes. No representation is made or implied that licenses are not required to avoidinfringement in the use of this standard.Published byAmerican Natio
12、nal Standards Institute11 West 42nd Street, New York, New York 10036Copyright 1996 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 otherwise,without prior written permission of ITI, 125
13、0 Eye Street NW,Washington, DC 20005.Printed in the United States of AmericaContents Page Foreword ii 1 Scope .l 2 Normative references . .l 3 Definitions . .l 4 Conventions and abbreviations .l 5 Specification breakdown . .2 6 General . .2 6.1 Test environment .2 6.2 Measurement error .2 7 Media at
14、tachment .2 7.1 Receptacle keying .2 6 Media signal interface .4 8.1 Active output interface .4 8.2 Active input interface .lO 8.3 Station bypass interface . .12 9 Interface signals .15 9.1 Optical receiver . 15 Annexes A Test packet definition . .17 B Bit error rate test criteria .18 C FDDI jitter
15、budget and eye opening .27 i Foreword (This foreword is not part of American National Standard X3.255-l 996.) The Fibre Distributed Data Interface (FDDI) is intended for use in a high- performance general-purpose multistation network and is designed for effi- cient operation with a peak data rate of
16、 100 Mbit/s. It uses a Token Ring Architecture with optical fiber as the transmission medium. FDDI provides for hundreds of stations operating over an extent of tens of kilometers. The FDDI Physical Media Dependent (PMD) standard specifies the lower sublayer of the Physical Layer for the FDDI, inclu
17、ding the optical interface for multi-mode fiber FDDI stations. This Abstract Test Suite (ATS) provides a conformance test for FDDI PMD. FDDI PMD specifies the optical inter- face of FDDI stations. FDDI PMD is not a protocol standard and this stan- dard requires the measurement of physical quantities
18、 such as optical power, wavelength, and signal jitter. The intent of this standard is to speci- fy the tests as broadly as possible to allow measurement by various detailed test implementations. The ATS in this standard differs from the methodology of higher-level protocol conformance tests written
19、using the Tree and Tabular Combined Notation (TTCN) because TTCN does not pro- vide for Physical Layer testing, where there is no concept of a protocol data unit and where physical quantities must be measured. Four other standards, when available, will provide a complete confor- mance test of an FDD
20、I station: NOTE -The ATS MAC, ATS SMT, and PIGS Proforma standards are under devel- opment. (a) An ATS for the FDDI Physical Layer Protocol (PHY) that provides a conformance test for FDDI PHY. PHY specifies the upper sublayer of the Physical Layer for the FDDI, including the data encode/decode, fram
21、ing and clocking, as well as the elasticity buffer, smoothing, and repeat filter functions. FDDI PHY, however, does contain several state machines and implements a protocol at the level of FDDI code symbols. The only physical quantity that is measured in this conformance test is frequency. The PHY A
22、TS cannot use the TTCN notation and a notation is developed in the PHY ATS for specifying test patterns and expected results in terms of FDDI code symbol strings. (This standard is currently available as an American National Standard and is designated ANSI X3.248-l 998.) (b) An ATS for FDDI Media Ac
23、cess Control (MAC) that provides a con- formance test for FDDI MAC. MAC specifies the lower sublayer of the Data Link Layer for FDDI. It specifies access to the medium, including addressing, data checking, and data framing. MAC also specifies the receiver and transmitter state machines. Since MAC is
24、 a protocol that deals primarily with complete PDUs, the TTCN language is used to specify MAC protocol tests. Provisions of MAC, however, require high- resolution timing that may be difficult to achieve in commercial protocol testers. (c) An ATS for FDDI Station Management (SMT) that provides a conf
25、or- mance test for FDDI SMT. SMT specifies the local portion of the system management application process for FDDI, including the control required for proper operation of an FDDI station in an FDDI ring. SMT provides services such- as connection management, station insertion and removal station init
26、ialization, configuration management and fault recovery, communications protocol for external authority, scheduling poli- cies and the collection of statistics. SMT interacts with PMD, PHY, and MAC. Therefore, an ATS for portions of SMT that use MAC PDUs can be specified in TTCN, while other portion
27、s require other approaches. (d) A Protocol Implementation Conformance Statement (PICS) proforma for FDDI that provides a statement of the mandatory and optional requirements of each of the four FDDI base standards. The PIGS profor- ma is used to identify requirements for conformance testing and to s
28、pecify optional functionality requirements, particularly by workshops for functional standards and profiles. This standard was developed by Task Group X3T9.5 of Accredited Standards Committee X3 during 1990,199l ,1992, and 1993. The standards approval process started in 1993. This standard contains
29、three annexes. Annexes A and B are normative and are considered part of the standard; Annex C is informative and is not con- sidered part of the standard. Requests for interpretations, suggestions for improvement or addenda, or defect reports are welcome. They should be sent to the X3 Secretariat, I
30、nformation Technology Industry Council, 1250 Eye Street, NW, Suite 200, Washington, DC 20005. This standard was processed and approved for submittal to ANSI by Accredited Standards Committee on Information Technology, X3. Committee approval of the standard does not imply that all committee members v
31、oted for the standard. At the time it approved this standard, the X3 Committee had the following members: James D. Converse, Chair Donald C. Loughry, Vice-Chair Kate McMillan, Secretary Organization Represented Name of Representative American Nuclear Society Geraldine C. Main AMP, Inc Sally Hartzell
32、 (Alt.) . Edward Kelly Apple Computer, Inc Charles Brill (Alt.) David K. Michael ATNSl X3.229-l 9941 3 Definitions The specialized FDDI terms used in this standard are defined in the FDDI base standards: IS0 9314-1 (PHY), IS0 9314-2 (PMD), IS0 9314-3 (MAC) and IS0 9314-7 (SMT), listed in clause 2. 4
33、 Conventions and abbreviations The terms, SMT, MAC, PHY, and PMD, when set in roman type and used without modifiers, refer specifically to the local entities. When set in italic type, they refer to the correspond- ing standard listed in clause 2. The following acronyms and abbreviations are used in
34、this ATS: BER BR Error Rate (PMD) BERT Bit Error Rate Tester (PMD) CMS Cladding Mode Stripper (FOTP-34) DCD Duty Cycle Distortion (PMD) DDJ Data Dependent Jitter FDDI Fibre Distributed Data HLS Halt Line State (PHY) ILS Idle Line State (PHY) IUT Implementation Under MAC Media Access Control (PM0 Int
35、erface Test ) The designation numbers of equivalent American National Standard appear in the brackets that follow each listing. 2, Available from the American National Standards Institute, 11 West 42nd Street, New York, NY 10036. 1 ANSI X3.255-i 996 MIC Media interface Connector (PMD) NA Numerical A
36、perture (FOTP-34) NIST National Institute of Standards and Technology PCM Physical Connection Management (SMT) PHY Physical Layer Protocol (PI-#) PMD Physical Medium Dependent (PMD) PTB Physikalisch-Technishe Bundesanstalt PTF/PTCP Precision Test Fibre/Precision Test Connector Plug (PMD) QLS Quiet L
37、ine State (PI-/Y) RJ Random Jitter (P/VII) SME Source Monitoring Equipment (FOTP-34) SMT Station Management (S/VT) -ITFIT Target Token Rotation Time (MAC) The terms, SMT, MAC, PHY, and PMD, when used without modifiers refer specifically to the local entities. 5 Specification breakdown Table 1 summar
38、izes the requirements of IS0 9314-3. It identifies those requirements that are tested in this test specification and the specific test suite where they are tested. 6 General 6.1 Test environment The FDDI standards do not specify an operating environment. All tests specified in this docu- ment shall
39、be performed with temperature and atmospheric conditions consistent with the envi- ronmental operating specifications of the IUT. For FDDI stations which are directly powered (either wholly or partly) from the AC power line, all tests shall be carried out within 0,5% of the nominal operating voltage
40、. If the equipment is powered by other means, and those means are not supplied as a part of the apparatus (e.g., batteries, stabilized AC supplies, DC), all tests shall be carried out within the power sup- ply limit declared by the supplier. If the power supply is AC, the tests shall be conducted wi
41、thin 4% of the normal operating frequency. All optical power measurements shall be made with a calibrated power meter traceable to a recognized primary standard (e.g., NIST or PTB). 6.2 Measurement error Physical quantities are measured in this ATS (particularly optical power levels). There are meas
42、urement errors associated with the cali- bration and tolerance of the measurement instruments. Moreover, it is known that mea- surements of optical output power are not nec- essarily precisely repeatable due to differ- ences in the way connectors mate each time they are inserted. Where measurement r
43、epeatability is a concern, it is common in test standards to require a number of measure- ments and to add a safety factor of three times the standard deviation of those measurements to the mean. This ATS follows that convention. Bit error rates (BER) are measured in this ATS. At the rates specified
44、 in PMD practical tests are statistical tests of the hypothesis that IUT meets the PMD requirements with a limit- ed sample size. Associated with these tests is a confidence level. The confidence level cho- sen in this ATS is 90%. Tests that establish this confidence level may have varying dura- tio
45、ns. However, the shorter the test, the larger the safety margin required of the IUT if it is to have a high probability of passing the test. It is the burden of the conformance test labora- tory to verity that an IUT does conform to the standard. Therefore, measurement errors due to calibration, rep
46、eatability and statistical sam- pling are added to the requirement being test- ed so that the greater the error, the more diffi- cult it becomes to pass the conformance test. 7 Media attachment An FDDI station is attached to the fibre optic medium by a Media Interface Connector (MIC). IS0 9314-3 cla
47、use 7 specifies the dimensions of the MIC plug and the recepta- cle in the station. This clause defines tests of station MIC requirements. 7.1 Receptacle keying 7.1.1 Purpose Every FDDI port is designated either A, B, S or M and IS0 9314-3 figure 8 specifies the keying required for a receptacle for
48、each type of port. This test case verifies the receptacle keying. 2 ANSI X3.255-1996 Table 1 - Specification breakdown Name PIGS IS0 9314-3 item No. reference Test reference Active output interface Center wavelength Average power Source FWHM spectral width Rise Time Fall time Duty cycle distortion R
49、andom jitter Data dependent jitter Extinction ratio Pulse envelope PMD1.l 8.1 .l table 1 8.1.4 PMD1.2 8.1.1 table 1 8.1 .l PMD1.3 8.1 .l figure 9 8.1.4 PMDl.4 8.1.1 table 1 8.1.2 PMD1.5 8.1 .l table 1 8.1.2 PMD1.6 8.1 .l table 1 8.1.5 PMD1.7 8.1 .l table 1 8.1.6 PMD1.8 8.1.1 table 1 8.1.6 PMDl.9 8.1 .l table 1 8.1.3 8.1.2 figures 10 S plug can be inserted. 8 Media signal intetface The following test cases verify the requirements for the media signal interface specified in IS0 9314-3 clause 8. 8.1 Active output interface The test cases in this group validate the require- ments of IS0 931
