1、INTERNATIONALSTANDARDIEC60728-7-2First edition2003-10Cable networks for television signals,sound signals and interactive services Part 7-2:Hybrid Fibre Coax Outside PlantStatus Monitoring Media access Control(MAC)Layer SpecificationReference numberIEC 60728-7-2:2003(E)LICENSED TO MECON Limited.-RANC
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8、 Customer Service Centre:Email:custserviec.ch Tel:+41 22 919 02 11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.INTERNATIONALSTANDARDIEC60728-7-2First edition2003-10Cable networks for television signals,sound si
9、gnals and interactive services Part 7-2:Hybrid Fibre Coax Outside PlantStatus Monitoring Media access Control(MAC)Layer Specification IEC 2003 Copyright-all rights reservedNo part of this publication may be reproduced or utilized in any form or by any means,electronic ormechanical,including photocop
10、ying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.chXFor price,see current cataloguePRICE CODECommis
11、sion Electrotechnique InternationaleInternational Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 60728-7-2 IEC:2003(E)CONTENTSFOREWORD.4INTRODUCTION.61Scope.72Normative references.73Terms,definitions and
12、abbreviations.84Reference architecture forward and return channel specifications.105Media access control layer specification.105.1Overview.105.2MAC packet transport.115.3MAC packet structure.135.4MAC packet delimiters.185.5MAC protocol data units(PDUs).186MAC protocol operation.296.1Non-volatile par
13、ameters.296.2Duplex capabilities.296.3Packet priorities.296.4Packet reception.296.5NE responses.306.6Message sequence numbers and transaction synchronization.306.7Solicited messages.316.8Autonomous(unsolicited)messages.316.9Return channel transmissions.356.10 MAC state machines.35Annex A(informative
14、)Operational details.38A.1 Introduction.38A.2 Time of day.38A.3 Firmware downloads.38A.4 NE addressing.38A.5 Alarm processing HMS MAC protocol.39A.6 Automatic channel discovery.43A.7 Auto-registration.44A.8 Configuration changes and SNMP trap generation.45Figure 1 Reference architecture diagram.10Fi
15、gure 2 Bit transmission order.12Figure 3 MAC packet structure.13Figure 4 MAC header control byte Bit definition.13Figure 5 MAC header sequence byte Bit definition.16Figure 6 MAC PDU structure.18Figure 7 STATRESP STATUS byte Bit definition.20Figure 8 Return channel transmission permitted.35LICENSED T
16、O MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.60728-7-2 IEC:2003(E)3 Figure 9 Contention state diagram.36Figure 10 Backoff state diagram.37Figure A.1 Property MIB usage.39Table 1 Transponder type classifications.7Table 2 Generic MAC packet structure.13Table 3 Protocol field values.14Table 4 MAC PDUs.19Table 5 Possible MAC protocol transactions.19Table 6 NAK PDU format.20Table 7 ACK PDU format.20Table 8 STATRQST PDU format.20Table 9 STATRES
