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1、ETSI TS 102 814 1.2.1 (2003-04) Technical Specificafion Digital Video Broadcasting (DVB); Ethernet Home Network Segment 2 ETSI TS 102 814 V1.2.1 (2003-04) The pre ent d Reference RTS/JTC-DVB-146 Keywords DVB, ethernet, IP, network, protocol ETSI 650 Route des Lucioles F-O6921 Sophia Antipolis Cedex

2、- FRANCE Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 Siret No 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-prfecture de Grasse (06) No 7803/88 Important notice Individual copies of the present document can be downloaded from: http:lwmv.etsi .arq cument may be made

3、 available in more than one electronic version or in print. In any ca e of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept

4、 on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at ha p:/pa rta I. etsi I a rgltbistat uslstatus .as p

5、 If you find errors in the present document, send your comment to: Cori vriaht Notifica tion No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. O European Telecommunications Standards Institute 2003.

6、O European Broadcasting Union 2003. All rights reserved. DECTTM, PLUGTESTSTMand UMTSTMare Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI regi

7、stered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI 3 ETSI TS 102 814 V1.2.1 (2003-04) Contents Intellectual Property Rights 4 Foreword . 4 1 Scope 5 2 References 5 3 Abbreviations . 6 4 Topology of an Ethernet 100BASE-T Home Network Segment . 6 5 6 Annex A (informati

8、ve): Carriage of IP-based traffic 7 Quality of Service (QoS) 7 Bibliography . 8 History 9 ETSI 4 ETSI TS 102 814 V1.2.1 (2003-04) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential

9、 IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR O00 3 14: “Intellectual Property Rights (7PRs); Essential, orpotentially Essential, IPRs notlJied to ETSI in respect ofETSI standards“, which is available from the ETSI Secretariat. Latest updates are

10、available on the ETSI Web server (5). All published ETSI deliverables shall include information which directs the reader to the above source of information. Foreword This Technical Specification (TS) has been produced by Joint Technical Committee (JTC) Broadcast of the European Broadcasting Union (E

11、BU), Comit Europen de Normalisation ELECtrotechnique (CENELEC) and the European Telecommunications Standards Institute (ETSI). Please be informed that the following significant change has been made since V1.1.1: removal of text from clause 4 seemingly requiring mandatory support of CSMA/CD, even for

12、 switched architectures. NOTE: The EBU/ETSI JTC Broadcast was established in 1990 to Co-ordinate the drafting of standards in the specific field of broadcasting and related fields. Since 1995 the JTC Broadcast became a tripartite body by including in the Memorandum of Understanding also CENELEC, whi

13、ch is responsible for the standardization of radio and television receivers. The EBU is a professional association of broadcasting organizations whose work includes the Co-ordination of its members activities in the technical, legal, programme-making and programme-exchange domains. The EBU has activ

14、e members in about 60 countries in the European broadcasting area; its headquarters is in Geneva. European Broadcasting Union CH-I218 GRAND SACONNEX (Geneva) Switzerland Tel: +41 22 717 21 11 Fax: +41 22 717 24 81 Founded in September 1993, the DVB Project is a market-led consortium of public and pr

15、ivate sector organizations in the television industry. Its aim is to establish the framework for the introduction of MPEG-2 based digital television services. Now comprising over 200 organizations from more than 25 countries around the world, DVB fosters market-led systems, which meet the real needs

16、, and economic circumstances, of the consumer electronics and the broadcast industry. ETSI 5 ETSI TS 102 814 V1.2.1 (2003-04) 1 Scope The present document defines a wired Home Network Segment (HNS) based on Ethernet 100BASE-T, as described in TR 102 033 i. The present document defines how IP traffic

17、 for DVB services will be carried over the 100BASE-T Ethernet HNS, and describes how IP QoS is mapped to the Ethernet layer. All the IP related functionality such as initial registration and configuration (including IP address assignment) of a Home Network End Device (HNED) is defined in Draft IPI 2

18、001-071 (see Bibliography). The present document applies to interfaces IPI-1, IPI-2 and IPI-3, as defied in TR 102 033 i. It is not the intention to come up with a completely new standard but to refer as far as possible to existing standards. The present document should meet the existing commercial

19、requirements as defined in CM255rev4 and DVB CM159R2 (see Bibliography). 2 Re fe re nces The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication andor edition nu

20、mber or version number) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at htlu:/docbox.etsi.or:eerence. i

21、l ETSI TR 102 033 (Vi. 1.1): “Digital Video Broadcasting (DVB); Architectural framework for the delivery of DVB-services over IP-based networks“. IEEE 802-2001 : “IEEE Standard for Local and Metropolitan Area Networks: Overview and Architecture“. 21 31 IEEE 802.1D (1998)/ISO/IEC 15802-3: “Informatio

22、n technology; Telecommunications and information exchange between systems; Local and metropolitan area networks; Common specifications; Media Access Control (MAC) Bridges“. IEEE 802.3-2002: “IEEE Standard for Information technology - Telecommunications and information exchange between systems - Loca

23、l and metropolitan area networks - Specific requirements - Part 3: Carrier Sense Multiple Access with Collision Detection (CSMAKD) Access Method and Physical Layer Specifications“. 41 51 IEEE 802.2-1998: “IEEE Standard for Information technology; Telecommunications and information exchange between s

24、ystems; Local and metropolitan area networks; Specific requirements; Part 2: Logical Link Control“. IETF RFC 1042 (1988): “Standard for the transmission of IP datagrams over IEEE 802 networks“, J. Postel, J.K. Reynolds. IETF RFC 826 (1982): “Ethernet Address Resolution Protocol: Or converting networ

25、k protocol addresses to 48.bit Ethernet address for transmission on Ethernet hardware“, D.C. Plummer. IEEE 802.1Q-1998: “IEEE standard for local and metropolitan area networks: Virtual Bridged Local Area Networks“. IETF RFC 2998 (2000): “A Framework for Integrated Services Operation over Diffserv Ne

26、tworks“. ETSI TS 102 813: “Digital Video Broadcasting (DVB); IEEE 1394 Home Network Segment“. ETSI 6 ETSI TS 102 814 V1.2.1 (2003-04) 3 Abbreviations For the purposes of the present document, the following abbreviations apply: CD cos CSMA DHCP DIX DNG DSCP DVB HNCD HNED HNS IEEE IETF IP IPI TOS UTP

27、QOS Collision Detection Class of Service Carrier-Sense Multiple Access Dynamic Host Configuration Protocol Digital, Intel and Xerox Delivery Network Gateway DiffServ CodePoint Digital Video Broadcasting Home Network Connecting Device Home Network End Device Home Network Segment Institute of Electric

28、al and Electronics Engineers Internet Engineering Task Force Internet Protocol Internet Protocol Infrastructure Quality of Service Type of Service Unshielded Twisted Pair 4 Topology of an Ethernet 1 OOBASE-T Home Network Segment Based on the description of a Home Network Segment (HNS) in the archite

29、ctural framework specification i, the 100BASE-T Ethernet HNS is based on a star architecture, with use of Unshielded Twisted Pair (UTP) cabling to connect between nodes. For an architecture overview see 2. The Home Reference Model in i also introduces a Home Network Connecting Device (HNCD). A HNCD

30、can act as a bridge, router or gateway and connects HNSs with each other. The 100BASE-T Ethernet HNS may be connected via a HNCD to another DVB HNS e.g. IEEE 1394 see TS 102 813 lo, or wireless. The specification for a HNCD that interconnects IEEE 802 LANs (below the MAC service boundary) in a bridg

31、ed format is defined in IEEE 802.1D 3. The present document will apply to connection between two or more 100BASE-T Ethernet HNSs (e.g. an Ethernet switch or hub) and will apply also to bridging between a 100BASE-T Ethernet HNS and another HNS based on the IEEE 802 MAC layer e.g. a wireless HNS. The

32、HNCD shall provide support for QoS via IEEE 802. lp 3 (see clause 6). An example configuration allows for a 100BASE-T Ethernet HNS to connect a Delivery Network Gateway (DNG) to Ethernet based Home Network End Devices (HNEDs). The DNG may present a single 100BASE-T interface to the Ethernet HNS (in

33、this case a HNCD in the form of an external hub or switch is required to connect multiple terminals), or the DNG may provide multiple 100BASE-T interfaces (in hub or switch format). To provide guaranteed QoS it is recommended that a switched configuration is used. Note that the DNG may provide a bri

34、dged or routed connection. The Ethernet layer Ethernet 100BASE-T is specified in IEEE 802.3 4. The 802.3 MAC layer shall be used as defined in IEEE 802.3 4. The Link layer specified in IEEE 802.2 5 shall be used. Note that alternative legacy Ethernet Frame formats (e.g. DIX) will not be supported du

35、e to need to support IEEE 802 2 framing for QoS. Ethernet physical layer HNEDs connected to the 100BASE-T Ethernet HNS shall support the IEEE 802 100BASE-TX Ethernet physical layer as defiied in 4. RJ45 Ethernet sockets shall be used. ETSI 7 ETSI TS 102 814 V1.2.1 (2003-04) 5 Carriage of IP-based tr

36、affic Within the context of the architectural framework specification i, all the IP-based traffic will transparently be carried over a 100BASE-T Ethernet network. Therefore, the interfaces IPI-1, IPI-2 and IPI-3 on a 100BASE-T Ethernet HNS shall comply with the IETF specification IETF RFC 1042 6. Th

37、e Address Resolution Protocol as defined in IETF RFC 826 7 shall be used. For the addressing of Home Network End Devices (HNED) on a 100BASE-T Ethernet network DHCP shall be supported. Each HNED should be uniquely identified by its MAC address (48 bit Ethernet address). All IP-based functionality re

38、quired to carry IP traffic over a 100BASE-T HNS and over a HNCD can be found in the network provisioning and IP addressing specification Draft IPI 200 1-07 1 (see Bibliography). 6 Quality of Service (QoS) The interfaces IPI-1, IPI-2 and IPI-3 on the Ethernet 100BASE-T HNS shall support IEEE 802.1 3,

39、 with defined user priority classes. The IEEE 802. lp field 3 shall be supported in an IEEE 802.1Q 8 compliant Ethernet frame. The marking shall be based on the DiffServ CodePoint (DSCP) marking method 9 as shown in table 1. Table 1: DSCP Values and corresponding Ethernet IEEE 802.1 marking For a HN

40、S based on 100BASE-T Ethernet these DSCP values are used to map a traffic type onto the corresponding IEEE 802.1 priority codes 3. Packets shall be marked using the Layer 2 Class of Service (COS) settings in the User Priority bits of the 802. lp portion of the 802.1Q 8 header. These can be mapped to

41、 the IP Precedence/DSCP bits in the Type of Service (TOS) byte of the IPv4 header. Note that the 802.1Q 8 header adds an additional 4 bytes of data into an Ethernet frame header. The 802.1 priority field is one of the fields in the 802.1Q 8 header, and is a 3 bit field. Any switching device that imp

42、lements the IEEE 802.1Q specification 8 can use the user-priority field to determine the scheduling class a packet belongs to. Note that mapping the IP precedence field is easy, as it can be copied to the user-priority field directly, as both the fields are 3 bits long. It is not as easy to map the

43、DSCP field to the user-priority field, as the DSCP is 6 bits in length and the user-priority field is only 3 bits in length. Therefore the IP precedence portion of the DSCP field cannot be copied into the user-priority field. Instead the DSCP field must be tested for values that match the DSCP value

44、 shown in column 2. If the DSCP value does not match any of the values shown in column 2, the packet must be marked with a user-priority value of O. ETSI 8 ETSI TS 102 814 V1.2.1 (2003-04) Annex A (informative): Bibliography CM255rev4 (21 March 2001): “Commercial Requirements for Multimedia Services

45、 over Broadband IP in a DVB Context“. DVB CM159R2: “Commercial Requirements for Delivery of DVB services over a Home Access In-house Digital Network based on Ethernet 100BaseT“. Draft IPI 200 1-07 1 : “Network Provisioning and IP Addressing“. ETSI 9 ETSI TS 102 814 V1.2.1 (2003-04) vl.l.l v1.2.1 History November 2002 Publication April 2003 Publication ETSI