ISO/FDIS 14908-3

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 14908-3
ISO/TC 205
Interconnection of information
Secretariat: ANSI
technology equipment — Control
Voting begins on:
Network Protocol —
2011-01-04
Part 3:
Voting terminates on:
2011-03-04
Power line channel specification

Interconnexion des équipements des technologies de l'information —
Protocole de réseau de contrôle —
Partie 3: Spécification de canal de courants porteurs


Please see the administrative notes on page iii

RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORT-
ING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 14908-3:2011(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2011

---------------------- Page: 1 ----------------------
ISO/FDIS 14908-3:2011(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.


Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user's country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,
photocopying, recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO's
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 copyright@iso.org
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.

ii © ISO 2011 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/FDIS 14908-3:2011(E)
In accordance with the provisions of Council Resolution 15/1993, this document is circulated in the
English language only.


© ISO 2011 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO/FDIS 14908-3:2011(E)
Contents Page
Foreword.v
Introduction.vi
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 General description .2
4.1 Electrical safety.2
4.2 Functional partitioning of PL specification.2
5 Power Line Medium specifications.3
5.1 Power .3
5.2 Data channel.3
5.3 Physical and electrical specifications .3
5.4 Connectors and coupling .3
5.5 Signal coupling between phases .3
5.6 Surge protection and related devices.4
6 PL Node specifications .4
6.1 Compliance.4
6.2 Interface to MAC sub-layer .4
6.3 Word encoding.4
6.4 PL packet timing .4
6.5 Transmitter characteristics.5
6.6 Receiver characteristics .7
Bibliography. 13

iv © ISO 2011 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/FDIS 14908-3:2011(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 14908-3 was prepared by CEN/TC 247, was adopted, under the fast track procedure, by joint Technical
Committee ISO/IEC JTC 1, Information technology, and was assigned to SC 25, Interconnection of
information technology equipment. It was then transferred to ISO/TC 205, Building environment design.
ISO 14908 consists of the following parts, under the general title Interconnection of information technology
equipment — Control Network Protocol:
⎯ Part 1: Protocol Stack
⎯ Part 2: Twisted-pair communication
⎯ Part 3: Power line channel specification
⎯ Part 4: IP communication

© ISO 2011 – All rights reserved v

---------------------- Page: 5 ----------------------
ISO/FDIS 14908-3:2011(E)
Introduction
This part of ISO 14908 specifies the Control Network Power Line (PL) Channel and serves as a companion
document to ISO 14908-1. Its purpose is to present the information necessary for the development of a PL
physical network and nodes to communicate and share information over that network. This is one of a series
of documents covering the various media that comprise the CNP standard.
This part of ISO 14908 covers the complete physical layer (OSI layer 1), including the interface to the Medium
Access Control (MAC) sub-layer and the interface to the medium. It includes parameters specific to the PL
channel type, even though the parameters may be controlled at an OSI layer other than layer 1. This part of
ISO 14908 also provides a set of physical and electrical specifications to serve as guidelines for the power line
environment as an aid in developing products for that environment.
This part of ISO 14908 has been prepared to provide mechanisms through which various vendors of local
area control networks may exchange information in a standardized way. It defines communication capabilities.
This part of ISO 14908 is used by anyone involved in design, manufacture, engineering, installation and
commissioning activities and has been prepared in response to the essential requirements of the Constructive
Products Directive.
The CNP specification model is based on the OSI 7-layer model Reference Model. There are also important
extensions to the OSI Reference Model. Figure 1 illustrates the scope of this specification in reference to the
entire CNP model. In this part of ISO 14908, only the parts of the model relevant to power line communication
are specified. Anything outside this boundary is covered in other parts of ISO 14908. Similar specifications
exist for other CNP media.
Application Layer
Session Layer
Transport Layer
Authentication Server
Transaction Control Sub-Layer
Network Layer
LLC-Sublayer
MAC-Sublayer
Physical Layer

Scope of this
standard
EN14908-2 (Twisted Pair)
EN14908-3 (Power-Line)
EN14908-4 (IP Communication)
• • •

Figure 1 — Relationship of CNP 3 specification to CNP 1 specification
vi © ISO 2011 – All rights reserved

---------------------- Page: 6 ----------------------
ISO/FDIS 14908-3:2011(E)
The International Organization for Standardization (ISO) and the 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.
ISO and the IEC take no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured ISO and the 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 patent rights is registered with ISO and the IEC. Information may be
obtained from:
Echelon Corporation, 4015 Meridian Avenue, San Jose, CA 94304, USA, phone +1-408-938-5234,
fax: +1-408-790-3800, http://www.echelon.com.



© ISO 2011 – All rights reserved vii

---------------------- Page: 7 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 14908-3:2011(E)

Interconnection of information technology equipment —
Control Network Protocol —
Part 3:
Power line channel specification
1 Scope
This part of ISO 14908 specifies all the information necessary to facilitate the exchange of data and control
information over the power line medium for networked control systems used in conjunction with ISO 14908-1.
This part of ISO 14908 establishes a minimal set of rules for compliance. It does not rule out extended
services to be provided, given that the rules are adhered to within the system. It is the intention of this part of
ISO 14908 to permit extended services (defined by users) to coexist.
Certain aspects of this part of ISO 14908 are defined in other documents. These documents are referenced
where relevant. In the case where a referenced standard conflicts with this part of ISO 14908, the latter will
prevail.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 14908-1, Interconnection of information technology equipment — Control Network Protocol — Part 1:
Protocol Stack
EN 50065-1, Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz —
Part 1: General requirements, frequency bands and electromagnetic disturbances
EN 50065-2-1, Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz —
Part 2-1: Immunity requirements for mains communications equipment and systems operating in the range of
frequencies 95 kHz to 148,5 kHz and intended for use in residential, commercial and light industrial
environments
EN 50065-2-2, Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz —
Part 2-2: Immunity requirements for mains communications equipment and systems operating in the range of
frequencies 95 kHz to 148,5 kHz and intended for use in industrial environments
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14908-1 and the following, with
regard to the power line medium and physical layer shown in Figure 1, apply.
© ISO 2011 – All rights reserved 1

---------------------- Page: 8 ----------------------
ISO/FDIS 14908-3:2011(E)
3.1
PL node
user node attached to the power line medium at a tap that meets the requirements of this International
Standard
3.2
line cord
cable not part of the power line network that allows a node located away from the power line network to be
connected to the network
3.3
power line network
communication network based on power distribution lines (“power lines”), from the final distribution
transformer to all homes served by that transformer, including all wiring in those homes
3.4
non-network-powered node
compatible node that attaches to the power line network but does not draw any power from the network
4 General description
4.1 Electrical safety
This clause gives several recommendations related to safety concerns with respect to this International
Standard.
This discussion is not complete, nor does it address all possible safety issues. The designer is urged to
consult, among other things, the relevant local and national electrical codes for the country of intended use.
Local codes may supplement national electrical codes and impose additional safety related requirements.
Products conforming to this International Standard shall be designed, constructed, assembled, tested and
installed following recognised safety provisions appropriate to products covered by the standard.
Power line network cables are subject to at least five direct electrical safety hazards during their use:
• high-energy transients coupled into the power line network from external environmental sources;
• possible differences between safety grounds to which network components are connected;
• possible high voltages on neutral or ground wiring;
• possible open safety grounds;
• high short-circuit current levels available at interface.
These electrical safety hazards should be alleviated for the network to perform properly. In addition to
provisions for properly handling these faults in an operational system, special measures should be taken to
maintain the intended safety features during changes of an existing network.
All wire and wiring to which nodes connect should conform to wiring standards of the appropriate national
code for the country of intended use and should have been inspected to comply with that code.
4.2 Functional partitioning of PL specification
This specification divides the complete power line environment into two basic parts: the powerline medium
and the node physical access specification.
2 © ISO 2011 – All rights reserved

---------------------- Page: 9 ----------------------
ISO/FDIS 14908-3:2011(E)
The medium specification concerns the capabilities and properties of the physical medium. This encompasses
such items as its bandwidth, frequency allocation, electrical and physical specifications, connectors etc.
The node physical access specification deals with the physical properties of that part of the node that makes
contact with the medium. Also described is the interface between the physical layer and the symbol-encoding
sub-layer.
5 Power Line Medium specifications
5.1 Power
The nodes should not rely on the line frequency for t
...