1、ETSI ES 201 803-1 1.1.1 (2001-03) ETSI Standard Dynamic synchronous Transfer Mode (DTM); Part 1: System description 2 ETSI ES 201 803-1 V1.l.l (2001 -03) Tt- Reference DEUSPAN-1 30004 Keywords DTM ETSI 650 Route des Lucioles F-O6921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 O0 Fax: +33 4
2、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: present document may be made available in more than one electronic version or in p
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5、tion No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. 8 European Telecommunications Standards Institute 2001. All rights reserved. ETSI 3 ETSI ES 201 803-1 V1.l.l (2001 -03) Contents Intellectual Pr
6、operty Rights 4 Foreword 4 Introduction 5 1 2 3 3.1 3.2 4 4.1 4.1.1 4.1.2 4.1.3 4.1.4 4.1.5 4.1.6 4.1.7 5 5.1 5.1.1 5.1.2 5.1.3 5.1.4 5.1.5 6 6.1 6.2 6.2.1 6.2.2 6.2.2.1 6.2.2.2 6.2.2.3 6.2.2.4 6.2.2.5 6.2.3 6.2.3.1 6.2.3.2 6.2.3.3 6.2.3.4 6.2.4 Scope 6 References 6 Definitions and abbreviations 7 D
7、efinitions 7 Abbreviations 8 System overview 9 Descriptions of Terms . 9 Physical link 9 Data link 9 Frame and slot . 10 Channel . 10 Network . 10 Management 10 Service description 11 Synchronization . 10 Basic service over a channel 11 Creation and removal . 11 Bandwidth . 12 Addresses 12 Delay and
8、 jitter 12 Control and Transmission model 13 Protocol layers 13 DTM Physical Layer (DPL) . 14 DTM data Link Layer (DLL) 15 Channel adaptation . 15 Adddrop function 15 Bypass function 15 Data link maintenance 15 Data link resource management 15 DTM Network Layer (DNL) 15 Channel management 15 Network
9、 Path determination 16 Switching . 16 Synchronization 16 Interworking layer 16 Multicast 12 Functions and Protocols 13 7 7.2 Transmission plane 17 Control. Transmission and Management planes . 17 7.1 Control plane . 17 7.3 Management plane 17 7.3.1 Network management 17 7.3.2 Node management . 17 8
10、Interfaces 18 History . 19 ETSI 4 ETSI ES 201 803-1 V1.l.l (2001 -03) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and no
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13、ocument. Foreword This ETSI Standard (ES) has been produced by ETSI Technical Committee Services and Protocols for Advanced Networks (SPAN). The present document is part 1 of a multi-part deliverable covering Dynamic synchronous Transfer Mode (DTM), as identified below: Part 1: “System description“;
14、 Part 2: “System characteristics“; Part 3: “Physical Protocol“; Part 4: Part 5: Part 6: Part 7: Part 8: Part 9: Part 10: Part 11: Part 12: Part 13: “Network management“. NOTE: “Mapping of DTM frames into SDWSONET containers“; “Mapping of PDH over DTM“; “Mapping of SDWSONET over DTM“; “Mapping of Eth
15、ernet over DTM“; “Mapping of Frame relay over DTM“; “Mapping of ATM over DTM“; “Routeing and switching of IP flows over DTM“; “Mapping of video streams over DTM“; “Mapping of MPLS over DTM“; Parts 4, 5 and 6 will be produced by ETSI Technical Committee Transmission and Multiplexing (TM) and part 13
16、by ETSI Technical Committee Telecommunications Management Network (TMN). ETSI 5 ETSI ES 201 803-1 V1.l.l (2001 -03) Introduction Dynamic synchronous Transfer Mode (DTM) is a time division multiplex and a circuit-switched network technique that combines switching and transport. The present document d
17、escribes the general properties of DTM and the DTM service over a unidirectional data channel. The overall system architecture is described and fundamental functions are identified. Part 2 includes system aspects that are mandatory or optional for nodes from different vendors to interoperate. The in
18、terworking granularity should be at node level, such that nodes from different vendors can interoperate with regard to well-defined functions. Part 3 specifies the physical layer for physical links based on Sb10b encoding. Part 4 describes how DTM frames are mapped onto SDWSONET containers. The tran
19、sport of various tributary signals is specified for PDH (part 3, SDWSONET (part 6), Ethernet (part 7), Frame Relay (part S), ATM (part 9), IP (part lo), video streaming (part li), MPLS (part 12). Finally, management aspects are standardized in part 13. ETSI 6 ETSI ES 201 803-1 V1.l.l (2001 -03) 1 Sc
20、ope The present document contains: 1) the necessary terminology and definitions to constitute a conceptual base for Dynamic synchronous Transfer Mode (DTM); 2) a reference configuration and definition of the DTM service; 3) a layered protocol and function model for putting the DTM functional groups,
21、 protocols and relevant interfaces in a context. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present documen t. References are either specific (identified by date of publication, edition number, version number, etc.) or
22、non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. 111 121 ATM Forum af-cs-0107.000: “Addressing Addendum for UNI Signalling 4.0“. ITU-T Recommendation G.703: “Physical/electrical characteristics of hierarchical digita
23、l interfaces“. 131 ITU-T Recommendation G.704: “Synchronous frame structures used at 1 544,6 312,2 048,s 488 and 44 736 kbids hierarchical levels“. 141 ITU-T Recommendation G.707: “Network node interface for the synchronous digital hierarchy (SDH)“ . ITU-R Recommendation BT.601-5: “Studio encoding p
24、arameters of digital television for standard 4:3 and wide-screen 16:9 aspect ratios“. 151 161 RFC 791: “Internet Protocol“. 171 IEEE 802.3 (2000): “Information technology - Local and metropolitan area networks - Part 3: Carrier sense multiple access with collision detection (CSMNCD) access method an
25、d physical layer specifications“. ITU-T Recommendation G.708 (1999): “Sub STM-O network node interface for the synchronous digital hierarchy (SDH)“. 181 ETSI 7 ETSI ES 201 803-1 V1.l.l (2001 -03) 3 3.1 Definitions and abbreviations Def i n it ions For the purposes of the present document, the follow
26、ing terms and definitions apply: access node: node that supports an external network interface, contains an interworking function for an external network and uses the DTM service bypass switching: space switching of slots from the receiver to transmitter on the same port on a per slot basis. Bypass
27、switching does not include time reordering channel: set of slots allocated from one source Access node to one or more destination Access nodes in a network. NOTE: The source and destination Access nodes can be the same, i.e. the channel is internal to the node control channel: channel used for contr
28、ol signalling data channel: channel used for transport of user data data link: set of physical links connected in any topology such that bidirectional communication between all nodes in the data link can be established using only bypass switching domain: full or part of a DTM network that is managed
29、 by a particular commercial or administrative entity (carrier/operator) DTM network: set of interconnected DTM nodes NOTE: A DTM network may be single-domain, or multi-domain. frame: set of slots forming an entity that is transmitted on a physical medium repeatedly every 125 ps (nominally), i.e. 8 O
30、00 frames/second node: network element that contains DTM functions node address: network layer address of a node physical link: unidirectional connection between the transmitter of one port and the receiver of another port port: receiver and transmitter pair on the same node being grouped such that
31、bypass switching is possible Each port is identified by a globally unique identifier (IEEE MAC address for the data link layer) slot: time slot containing 64 bits of control or user data. The slot may also hold a special code for idle data, error slot and end of packet marker switching: process of m
32、oving the data of a slot in both time and space, i.e. switching between different ports and changing slot numbers, while maintaining the bandwidth and avoiding slot reordering within each channel switch node: node that contains a switching function ETSI 3.2 8 Abbreviations For the purposes of the pr
33、esent document, the following abbreviations apply: API ATM DLL DNL DPL DTM FR IP MIB os1 PDH Rx SDH SNMP SONET Tx vc Application Protocol Interface Asynchronous Transfer Mode DTM data Link Layer DTM Network Layer DTM Physical Layer Dynamic synchronous Transfer Mode Frame Relay Internet Protocol Mana
34、gement Information Base Open System Interconnection Plesiochronous Digital Hierarchy Receiver Synchronous Digital Hierarchy Simple Network Management Protocol Synchronous Optical NETwork Transmitter Virtual Channel ETSI ES 201 803-1 V1.l.l (2001 -03) ETSI 9 ETSI ES 201 803-1 V1.l.l (2001 -03) 4 Syst
35、em overview This clause defines the concept of a DTM system (see figure 1)as a set of nodes interconnected by physical links. Communication between nodes takes place over channels, which are abstractions of communication resources between sending node and receiving node (or nodes). A node can be con
36、nected to nodes in external networks using technologies such as SDH, Ethernet, IP and Video, as well as other nodes in the DTM system. Figure 1 : DTM system overview 4.1 Descriptions of Terms 4.1.1 Physical link A physical link is a unidirectional communication medium connecting a pair of nodes. A s
37、ignal can be transmitted on a physical link from a sending node to a receiving node. The physical protocols will define the properties of various forms of physical links. 4.1.2 Data link A data link is a set of physical links and nodes, which are connected such that all involved nodes can communicat
38、e bidirectionally with all other nodes over bypass-switched paths only. The following fundamental data link topologies are supported: dual ring, dual bus and single ring (and its special case of a point-to-point connection). Combinations of these may be connected to form hybrid topologies, which may
39、 still be considered as one data link. The data link is monitored by a data link maintenance protocol, which among other things detects changes in the topology. ETSI 10 ETSI ES 201 803-1 V1.l.l (2001 -03) 4.1.3 Frame and slot A frame is a time-ordered set of bits. The kame is sent repeatedly at 8 O0
40、0 times per second. The frame starts with a start-of-frame marker and then continues with a time slot structure. Each time slot transports 64 bits of data (thus giving a transfer rate of 512 kbids) and can also convey non-data codes. The non-data codes are idle, End-of-Packet (EOP) and Error slot. T
41、he idle codeword is an end-to-end code that conveys the lack of data to send at the transmitter side. The EOP code is used for delimiting packets of channel adaptation protocols for asynchronous traffic. The Error slot is a special code that the network can generate whenever an unrecoverable error h
42、as occurred in the transmission. The Error slot can then help the receiver to distinguish intended traffic (data, idle or EOP) from broken traffic. 4.1.4 Channel A channel is a unidirectional virtual transmission path formed by a set of slots over one or more data link(s). Channels spanning over sev
43、eral data links can use different number of slots as long as the number of slots downstream is at least the number of slots on the transmitter end, and the ordinal of the slots constituting the channel may vary between the different data links. Channels can be of unicast, multicast or broadcast type
44、s. 4.1.5 Network A DTM network consists of one or more data links connected together in such a way that channels may be established between the interconnected nodes. The data link topologies may vary freely. The physical layer protocol may also vary between the connected data links. 4.1.6 Management
45、 At least one Management station is connected to the network. The functions of the station are configuration and control of the network. The Management station will be SNMP based and MIBs will be standardized. Since there is a standardized interface for Management stations, a Management station can
46、be connected to any DTM system node that supports the interface. Management information can be sent using inband SNMP over IP. This facilitates remote management within the network scope and does not require a separate management network. 4.1.7 Synchronization A Reference Clock node controls the fra
47、me rate and thereby also the slot rate. There can be several reference clocks connected to the network to be able to handle faults of the master reference clock or if some part of the network looses connectivity with the master reference clock. A standardized interface, using the standard ITU-T Reco
48、mmendation G.703 2, section 10 interface, between the DTM system and the Reference Clock node enables any suitable clock to be connected to the DTM system. In DTM the bit rate and frame rate are not fixed integer multiples of each other. DTM is a mesochronous technique instead of being synchronous o
49、r plesiochronous like SDH or PDH. DTM provides an isochronous service over its mesochronous physical links. ETSI 11 ETSI ES 201 803-1 V1.l.l (2001 -03) IEEE 802.3 7 FR UNI 4.0 i RFC791 6 G.704 3 G.708 8 BT.601 5 API Ethernet I I Frame Relay ATM IP I I I I PDH SDH/SONET Video Application I I 5 DTM service 4 k ? ? o o mi E r r S S R k E 2 k mi 2 Service description I LAN bridging IEEE 802.3 7 Ethernet FP I Frame Relay UNI 4.0 i RFC 791 6 G.704 3 G.708 8 I ATM I FTP I IP www I PDH Telephony SDH/SONET I The DTM service provided t
