1、INTERNATIONALSTANDARDIEC60728-7-1First edition2003-10Cable networks for television signals,sound signals and interactive services Part 7-1:Hybrid Fibre Coax Outside PlantStatus Monitoring Physical (PHY) Layer SpecificationReference numberIEC 60728-7-1:2003(E)Copyright International Electrotechnical
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9、 networking permitted without license from IHS-,-INTERNATIONALSTANDARDIEC60728-7-1First edition2003-10Cable networks for television signals,sound signals and interactive services Part 7-1:Hybrid Fibre Coax Outside PlantStatus Monitoring Physical (PHY) Layer Specification IEC 2003 Copyright - all rig
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12、nder license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,- 2 60728-7-1 IEC:2003(E)CONTENTSFOREWORD 3INTRODUCTION 51 Scope 62 Normative references. 73 Terms, definitions and abbreviations 73.10 Abbreviated terms 84 HMS reference architecture forward and ret
13、urn channel specifications. 94.1 HMS specification documents . 94.2 Functional assumptions .105 Physical layer specification.105.1 Separate forward and return channels .105.2 Single forward and return path channels115.3 Byte-based transmission115.4 Byte formats and transmission order115.5 Packet-bas
14、ed transmission 115.6 Duplex operation .115.7 Forward and return channel specifications.115.8 Media access control layer interface185.9 RF cut-off 18Bibliography19Figure 1 HMS Reference architecture diagram 9Figure 2 Bit transmission order.11Table 1 Transponder type classifications. 6Table 2 HMS doc
15、ument family. 9Table 3 Spectral limits by geographical area 10Table 4 HMS PHY channel RF and modulation specifications.12Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-60728-7-
16、1 IEC:2003(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION_CABLE NETWORKS FOR TELEVISION SIGNALS,SOUND SIGNALS AND INTERACTIVE SERVICES Part 7-1: Hybrid Fibre Coax Outside Plant status monitoring Physical (PHY) layer specificationFOREWORD1) The International Electrotechnical Commission (IEC) is a wor
17、ldwide organization for standardization comprisingall national electrotechnical committees (IEC National Committees). The object of IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields. Tothis end and in addition to other act
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26、ble for the correct application of this publication.9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject ofpatent rights. IEC shall not be held responsible for identifying any or all such patent rights.International Standard IEC 60728-7-1 has
27、been prepared by technical area 5: Cable networksfor television signals, sound signals and interactive services, of IEC technical committee 100:Audio, video and multimedia systems and equipment.This standard was submitted to the national committees for voting under the Fast TrackProcedure as the fol
28、lowing documents:CDV Report on voting100/576/CDV 100/683/RVCFull information on the voting for the approval of this standard can be found in the report onvoting indicated in the above table.This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.Copyright International El
29、ectrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,- 4 60728-7-1 IEC:2003(E)The committee has decided that the contents of this publication will remain unchanged until2006. At this date, the publication will
30、 be reconfirmed; withdrawn; replaced by a revised edition, or amended.The following differences exist in some countries:The Japanese de facto standard (NCTEA S-006) concerning requirements for the HFCoutside plant management, which was published in 1995, has already been available inJapan. The purpo
31、se of this standard is to support the design and implementation ofinteroperable management systems for HFC cable networks used in Japan. (see Table 4)Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted withou
32、t license from IHS-,-60728-7-1 IEC:2003(E) 5 INTRODUCTIONStandards of the IEC 60728 series deal with cable networks for television signals, soundsignals and interactive services including equipment, systems and installations for head-end reception, processing and distribution of television and sound
33、 signals and theirassociated data signals, and processing, interfacing and transmitting all kinds of signals for interactive servicesusing all applicable transmission media.All kinds of networks like CATV-networks, MATV-networks and SMATV-networks, individual receiving networksand all kinds of equip
34、ment, systems and installations installed in such networks, are withinthis scope.The extent of this standardization work is from the antennas, special signal source inputs tothe head-end or other interface points to the network up to the system outlet or the terminalinput, where no system outlet exi
35、sts.The standardization of any user terminals (i.e. tuners, receivers, decoders, multimediaterminals, etc.) as well as of any coaxial and optical cables and accessories therefore isexcluded.Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo rep
36、roduction or networking permitted without license from IHS-,- 6 60728-7-1 IEC:2003(E)CABLE NETWORKS FOR TELEVISION SIGNALS,SOUND SIGNALS AND INTERACTIVE SERVICES Part 7-1: Hybrid Fibre Coax Outside Plant status monitoring Physical (PHY) layer specification1 ScopeThis part of IEC 60728 specifies requ
37、irements for The Hybrid Fibre Coax (HFC) Outside Plant(OSP) Physical (PHY) Layer Specification and is part of the series of specifications developedby the Hybrid Management Sub-Layer (HMS) subcommittee under the SCTE. The purpose ofthe HMS specification is to support the design and implementation of
38、 interoperablemanagement systems for evolving HFC cable networks. The HMS Physical (PHY) LayerSpecification describes the physical layer portion of the protocol stack used forcommunication between HMS-compliant transponders interfacing to managed outside plantnetwork elements (NE) and a centralized
39、head-end element (HE).This standard describes the PHY layer requirements that must be implemented by all Type 2and Type 3 compliant OSP HMS transponders on the HFC plant and the controlling equipmentin the head-end. Any exceptions to compliance with this standard will be specifically notedherein as
40、necessary. Refer to Table 1 for a full definition of the type classifications.Electromagnetic Compatibility (EMC) is not specified in this standard and is left to the vendorto ensure compliance with local EMC regulatory requirements. Other than operatingtemperature, physical parameters such as shock
41、, vibration, humidity, etc., are also notspecified and left to the vendors discretion.Transponder type classifications referenced within the HMS series of standards are defined inTable 1.Table 1 Transponder type classificationsType Description ApplicationType 0Refers to legacy transponderequipment,
42、which is incapable ofsupporting the HMS specificationsThis transponder interfaces with legacy network equipmentthrough proprietary means.This transponder could be managed through the samemanagement applications as the other types through proxiesor other means at the head-endType 1Refers to stand-alo
43、ne transponderequipment (legacy or new) which canbe upgraded to support the HMSspecificationsThis transponder interfaces with legacy network equipmentthrough proprietary means.Type 1 is a standards-compliant transponder (eithermanufactured to the standard or upgraded) that connects tolegacy network
44、equipment via a proprietary interfaceType 2Refers to a stand-alone, HMS-compliant transponderThis transponder interfaces with network equipment designedto support the electrical and physical specifications defined inthe HMS standards.It can be factory or field-installed.Its RF connection is independ
45、ent of the monitored NEType 3Refers to a stand-alone or embedded,HMS-compliant transponderThis transponder interfaces with network equipment designedto support the electrical specifications defined in the HMSstandards.It may or may not support the physical specifications definedin the HMS standards.
46、It can be factory-installed. It may or may not be field-installed.Its RF connection is through the monitored NECopyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-60728-7-1 IEC:2003
47、(E) 7 2 Normative referencesNone.3 Terms, definitions and abbreviationsFor the purposes of this document, the following terms and definitions apply.3.1 forward spectrumthe pass-band of frequencies in HFC cable systems with a lower edge of between 48 MHzand 87,5 MHz, depending on the particular geogr
48、aphical area, and an upper edge that istypically in the range of 300 MHz to 860 MHz depending on implementation3.2 full spectrumcombined forward and return spectrums in HFC cable systems and excludes any guard band3.3 guard bandunused frequency band between the upper edge of the usable return spectrum and the loweredge of the usable forward spectrum in HFC cable systems3.4 network element (NE)active element in the outside plant that is capable of receiving commands from a head-endelement (HE) in the head-end and, as necessary, providing status information and alarmsback to the HE3.
