IEC_62056-46ed1.0en.pdf

INTERNATIONALSTANDARDIEC62056-46First edition2002-02Electricity metering Data exchange for meter reading,tariff and load control Part 46:Data link layer using HDLC protocolReference numberIEC 62056-46:2002(E)Publication numberingAs from 1 January 1997 all IEC publications are issued with a designation in the60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editionsThe IEC is now publishing consolidated versions of its publications.For example,edition numbers 1.0,1.1 and 1.2 refer,respectively,to the base publication,thebase publication incorporating amendment 1 and the base publication incorporatingamendments 1 and 2.Further information on IEC publicationsThe technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating tothis publication,including its validity,is available in the IEC Catalogue ofpublications(see below)in addition to new editions,amendments and corrigenda.Information on the subjects under consideration and work in progress undertakenby the technical committee which has prepared this publication,as well as the listof publications issued,is also available from the following:IEC Web Site(www.iec.ch)Catalogue of IEC publicationsThe on-line catalogue on the IEC web site(www.iec.ch/catlg-e.htm)enablesyou to search by a variety of criteria including text searches,technicalcommittees and date of publication.On-line information is also available onrecently issued publications,withdrawn and replaced publications,as well ascorrigenda.IEC Just PublishedThis summary of recently issued publications(www.iec.ch/JP.htm)is alsoavailable by email.Please contact the Customer Service Centre(see below)forfurther information.Customer Service CentreIf you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.chTel:+41 22 919 02 11Fax:+41 22 919 03 00INTERNATIONALSTANDARDIEC62056-46First edition2002-02Electricity metering Data exchange for meter reading,tariff and load control Part 46:Data link layer using UDLC protocolPRICE CODE IEC 2002 Copyright-all rights reservedNo part of this publication may be reproduced or utilized in any form or by any means,electronic ormechanical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission3,rue de Varemb Geneva,SwitzerlandTelefax:+41 22 919 0300e-mail:inmailiec.ch IEC web site http:/www.iec.chFor price,see current catalogue Commission Electrotechnique Internationale International Electrotechnical CommissionXB 2 62056-46 IEC:2002(E)CONTENTSFOREWORD.41Scope.62Normative references.63Terms,definitions and abbreviations.74Overview.84.1The LLC sub-layer.84.2The MAC sub-layer.84.3Specification method.85The LLC sub-layer.95.1The role of the LLC sub-layer.95.2Service specification for the LLC sub-layer.95.2.1Setting up the Data Link Connection.105.2.2Disconnecting the Data Link Connection.135.2.3Data communication.165.3Protocol specification for the LLC sub-layer.205.3.1Overview.205.3.2LLC protocol data unit(LPDU)structure.205.3.3State transition tables for the LLC sub-layer.216The MAC sub-layer.226.1HDLC selections.226.2Service specification for the MAC sub-layer.226.2.1Setting up the MAC connection.226.2.2Disconnecting the MAC connection.266.2.3Data communication.306.3Physical layer services used by the MAC sub-layer.326.3.1Overview.326.3.2Setting up a physical link.336.3.3Disconnecting the physical link.336.3.4Data communication.336.4Protocol specification for the MAC sub-layer.336.4.1The MAC PDU and the HDLC frame.336.4.2MAC addressing.356.4.3Command and response frames.396.4.4Elements of the procedures.426.4.5State transition diagram for the server MAC sub-layer.57Annex A(informative)FCS calculation.59Annex B(informative)Data model and protocol.62Annex C(informative)Data link layer management services.6362056-46 IEC:2002(E)3 Figure 1 Data Link(LLC)services for setting up the Data Link Connection.10Figure 2 Data Link(LLC)services for disconnecting the Data Link Connection.13Figure 3 Data link layer data communication services.17Figure 4 The ISO/IEC 8802-2 LLC protocol data unit format.20Figure 5 The used LLC protocol data unit format.20Figure 6 MAC sub-layer services for setting up the MAC(DL)connection at the clientand server sides.23Figure 7 MAC sub-layer services for disconnecting the MAC(DL)connection at theclient and server sides.26Figure 8 MAC sub-layer data communication services.30Figure 9 Physical layer services used by the MAC sub-layer.33Figure 10 MAC sub-layer frame format(HDLC frame format type 3).34Figure 11 Multiple frames.34Figure 12 The frame format field.34Figure 13 MSC for long MSDU transfer in a transparent manner.51Figure 14 Example configuration to illustrate broadcasting.52Figure 15 Sending out a pending UI frame with a.response data.53Figure 16 Sending out a pending UI frame with a