ISO IEC 14908-2-2012 Information technology - Control network protocol - Part 2 Twisted pair communication《信息技术 控制网络协议 第2部分 双纽线通信》.pdf
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1、 Reference number ISO/IEC 14908-2:2012(E) ISO/IEC 2012INTERNATIONAL STANDARD ISO/IEC 14908-2 First edition 2012-02-15 Information technology Control network protocol Part 2: Twisted pair communication Technologies de linformation Protocole de rseau de contrle Partie 2: Communication de pair torsade
2、ISO/IEC 14908-2:2012(E) COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2012 All rights reserved. Unless otherwise specified, 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
3、 either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO/IEC 2012 All rights reserved - 2 - Content
4、s Introduction .5 1 Scope.7 2 Normative references.7 3 Network overview .7 4 System specifications7 4.1 General aspects7 4.2 Cable8 4.3 Topology .8 4.3.1 Free or bus topology8 4.3.2 Repeater 8 4.4 Cable Termination 8 4.4.1 Free-topology segment8 4.4.2 Bus topology segment.8 4.5 Segment configuration
5、.9 4.6 Power specifications9 5 Link power 9 5.1 General 9 5.2 Source . 10 5.3 Power supply requirements. 10 5.4 Passive coupler circuit. 13 6 Node specifications 14 6.1 Link power 14 6.2 Hot plugging . 14 6.3 Transmitter/receiver interface to the MAC sub-layer. 14 6.3.1 Physical layer protocol data
6、unit. 14 6.3.2 Frame format. 15 6.3.3 Transmit waveform. 16 6.4 Impedance. 19 7 Communication parameters 20 Annex A (informative). 21 Environmental specifications. 21 Bibliography 22 Figures Figure 1 Termination8 Figure 2 Link Power Source.10 Figure 3 Power supply output ripple voltage requirement 1
7、1 Figure 4 Power supply startup interval behavior 12 Figure 5 Coupler circuit schematic.13 Figure 6 Physical layer protocol data unit 15 14908-2 ISO/IEC:2012 (E) - 3 - Figure 7 Frame format for compliant transmitter. .15 Figure 8 Idealised transmit waveform - zero bit16 Figure 9 Idealised transmit w
8、aveform - one bit.17 Figure 10 Maximum voltage spectrum over frequency relative to peak18 Figure 11 Minimum impedance powered and unpowered node19 Tables Table 1 Bus-Topology Distance Specifications 9 Table 2 Free-Topology distance specifications 9 Table 3 Power supply requirements.11 Table 4 Couple
9、r circuit bill of materials 14 Table 5 Link power requirements.14 Table 6 Communication parameters for interoperable transceiver.20 Table A. 1 Representative environmental specifications for nodes .21 14908-2 ISO/IEC:2012 (E) - 4 - Foreword ISO (the International Organization for Standardization) an
10、d IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal wi
11、th particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC ha
12、ve established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the join
13、t technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. ISO/IEC 14908-2 was prepared by CEN/TC 247 and was adopted, under a special “fast-track procedure”, by Joint Technica
14、l Committee ISO/IEC JTC 1, Information technology, in parallel with its approval by the national bodies of ISO and IEC. ISO/IEC 14908 consists of the following parts, under the general title Information technology Control network protocol: Part 1: Protocol stack Part 2: Twisted pair communication Pa
15、rt 3: Power line channel specification Part 4: IP communication 14908-2 ISO/IEC:2012 (E) - 5 - Introduction This International Standard has been prepared to provide mechanisms through which various vendors of local area control networks may exchange information in a standardised way. It defines comm
16、unication capabilities. This International Standard is to be used by all involved in design, manufacture, engineering, installation and commissioning activities. Echelon Corporation, 4015 Meridian Avenue, San Jose, CA 94304, USA, phone +1-408- 938-5234, fax: +1-408-790-3800 http:/. Attention is draw
17、n to the possibility that some of the elements of this International Standard may be the subject of patent rights other than those identified above. ISO and IEC shall not be held responsible for identifying any or all such patent rights. 14908-2 ISO/IEC:2012 (E) The International Organization for St
18、andardization (ISO) and International Electrotechnical Commission (IEC) draw attention to the fact that it is claimed that compliance with this International Standard may involve the use of patents held by Echelon Corporation. The ISO and IEC take no position concerning the evidence, validity and sc
19、ope of this patent right. The holder of this putative patent right has assured the ISO and IEC that they are willing to negotiate licences under reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this respect, the statement of the holder of the putative p
20、atent rights is registered with the ISO and IEC. Information may be obtained from: - 7 - INFORMATION TECHNOLOGY CONTROL NETWORK PROTOCOL Part 2: Twisted pair communication 1 Scope This International Standard covers the complete physical layer (OSI Layer 1), including the interface to the Media Acces
21、s Control (MAC) sub-layer and the interface to the medium. Parameters that are controlled by other layers but control the operation of the physical layer are also specified. 2 Normative references The following referenced documents are indispensable for the application of this International Standard
22、. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC 14908-1:2012, Information technology Control network protocol Part 1: Protocol stack. ISO/IEC 15018, Information technology - Gene
23、ric cabling for homes. 3 Network overview 4 System specifications 4.1 General aspects 14908-2 ISO/IEC:2012 (E) This section specifies the cable type used, terminations required with bus or free topology, maximum node counts and distances for link and locally powered schemes, and the maximum steady s
24、tate power that can be drawn from the link power supply. The CNP free-topology twisted-pair channel supports up to 128 nodes on a single network segment with an optional link power source that supplies DC power to the nodes on the network. The channel is specified to support free-topology wiring, an
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