1、ETSI ES 201 803-4 1.1.1 (2003-01) ETSI Standard Dynamic synchronous Transfer Mode (DTM); Part 4: Mapping of DTM frames into SDH containers 2 ETSI ES 201 803-4 VI .I .I (2003-01) Reference DES/TM-O1093 Keywords architecture, DTM, protocol, SDH, switching, transmission ETSI 650 Route des Lucioles F-O6
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6、communications Standards Institute 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
7、 registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI 3 ETSI ES 201 803-4 VI . 1 . 1 (2003-01) Contents Intellectual Property Rights 4 Introduction 4 1 Scope 6 2 References 6 3 Definitions and abbreviations . 7 3.1 Definitions . . 7 3.2 Abbreviations . 8 4 Overview
8、 8 5 SDH Higher order path/DTM Physical Link layer . 10 Connection fnct . 10 5.1 10 5.2 . 11 5.3 . 5.3.1 ypass layer type 2 Adaptation S4IBP2-A . 11 5.3.1.1 11 5.3.1.2 12 6 Mapping of DTM frames into VC-4 13 6.1 VC-4 structure . . 14 6.2 DTM Slot mapping . 14 6.3 Slot format . . 16 Foreword . 4 SDH
9、VC-n to DTM Bypass layer type 2 Adaptation source S4IBP2-A-So SDH VC-n to DTM Bypass layer type 2 Adaptation sink S4/BP2-APSk . Annex A (informative): STM-n Synchronization 17 History 19 Annex B (informative): Bibliography . 18 ETSI 4 ETSI ES 201 803-4 VI .I .I (2003-01) Intellectual Property Rights
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12、oreword This ETSI Standard (ES) has been produced by ETSI Technical Committee Transmission and Multiplexing (TM). The present document is part 4 of a multi-part deliverable covering Dynamic synchronous Transfer Mode (DTM), as identified below: Part 1: “System description“; Part 2: “System characteri
13、stics“; Part 3: “Physical protocol“; Part 4: Part 5: Part 6: Part 7: Part 8: Part 9: Part 10: Part 11 : Part 12: Part 13: Part 14 : “Mapping of DTM frames into SDH containers“; “Mapping of PDH over DTM“; “Mapping of SDH over DTM“; “Ethernet over DTM Mapping“; “Mapping of Frame relay over DTM“; “Mapp
14、ing of ATM over DTM“; “Routeing and switching of IP flows over DTM“; “Mapping of video streams over DTM“; “Mapping of MPLS over DTM“; “System description of sub-rate DTM“; “Network management l. I n t rod uct ion Dynamic synchronous Transfer Mode (DTM) is a time division multiplex and a circuit-swit
15、ched network technique that combines switching and transport. Part 1 describes 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 mandator
16、y or optional for nodes from different vendors to interoperate. The intenvorking 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 8B10B encoding. The pre
17、sent document (Part 4) describes how DTM frames are mapped onto SDH containers. ETSI 5 ETSI ES 201 803-4 VI .I .I (2003-01) The transport of various tributary signals is specified for PDH (Part 5), SDH (Part 6), Ethernet (Part 7), Frame Relay (Part S), ATM (Part 9), IP (Part lo), MPLS (Part 1 i), vi
18、deo streaming (Part 12). Finally, management aspects are standardized in Part 13. ETSI 6 ETSI ES 201 803-4 VI .I .I (2003-01) 1 Scope The present document: establishes a synchronous mapping of DTM frames into SDH VC-4 containers; specifies the characteristics of critical parameters for an SDH VC-4 b
19、ased physical interface; gives terms and definitions for message encoding; gives terms and definitions for the frame format; gives terms and definitions for the sync transport; gives terms and definitions for the sync and physical link status. 2 Re fe re nces The following documents contain provisio
20、ns which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication andor edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific referenc
21、e, the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at InttD:/doctsox.etsi .o-rpRefercncc. il ETSI ES 201 803-2-1: Dynamic synchronous Transfer Mode (DTM); Part 2: System characteristics; Sub-part 1 : Data link aspe
22、cts“. ETSI EN 300 417-4-1 : “Transmission and Multiplexing (TM); Generic requirements of transport functionality of equipment; Part 4-1 : Synchronous Digital Hierarchy (SDH) path layer functions“ ETSI EN 300 417-6-1 : “Transmission and Multiplexing (TM); Generic requirements of transport functionali
23、ty of equipment; Part 6- 1 : Synchronization layer functions“. ETSI EN 300 462-6-1 : “Transmission and Multiplexing (TM); Generic requirements for synchronization networks; Part 6- 1 : Timing characteristics of primary reference clocks“. ITU-T Recommendation G.707: “Network node interface for the sy
24、nchronous digital hierarchy (SDH)“. ITU-T Recommendation G.78 1 : “Synchronization layer functions“. ITU-T Recommendation G.783 : “Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks“. ITU-T Recommendation G. 805: “Generic functional architecture of transport networks“
25、. ITU-T Recommendation G. 806: “Characteristics of Transport Equipment - Description Methodology and Generic Functionality“. ITU-T Recommendation G. 8 11 : “Timing characteristics of primary reference clocks“. 21 31 41 51 61 71 SI 91 lo1 ETSI 7 ETSI ES 201 803-4 VI .I .I (2003-01) 3 3.1 Definitions
26、and abbreviations De fi nit ions For the purposes of the present document, the following terms and definitions apply: Access Point (AP): “reference point“ that consists of the pair of Co-located “unidirectional access“ points, and therefore represents the binding between the trail termination and ad
27、aptation functions (adopted from ITU-T Recommendation G.805) Adapted Information (AI): information passing across an AP (see also ITU-T Recommendation G. SOS), (adopted from ITU-T Recommendation G.806) Alarm Indication Signal (AIS): special marker sent in a data slot to mark the lack of transported
28、data as a result of a defect in the transmission path channel: set of slots allocated from one source access node to one or more destination access nodes in a network Characteristic Information (CI): Signal with a specific format, which is transferred on “network connections“. The specific formats w
29、ill be defined in the technology specific Recommendations. The information passing across a CP or TCP. (Adopted from ITU-T Recommendations G.805 and G.806) Connection Point (CP): reference point where the output of a trail termination source or a connection is bound to the input of another connectio
30、n, or where the output of a connection is bound to the input of a trail termination sink or another connection (adopted from ITU-T Recommendation G.806) defect: The density of anomalies has reached a level where the ability to perform a required function has been interrupted. Defects are used as inp
31、ut for performance monitoring, the control of consequent actions, and the determination of fault cause. (Adopted from ITU-T Recommendation G. 806). frame: set of slots forming an entity that is transmitted on a physical medium repeatedly every 125 ps (nominally), i.e. 8 O00 frames/second idle: speci
32、al marker sent in a data slot to mark the lack of transported data in the slot Management Information (MI): signal passing across an access point (adopted from ITU-T Recommendation G.806) Management Point (MP): A reference point where the output of an atomic function is bound to the input of the ele
33、ment management function, or where the output of the element management function is bound to the input of an atomic function. The MP is not the TMN Q3 interface. (Adopted from ITU-T Recommendation G.806). Performance Supervision (PS): special marker sent with the data containing per channel Performa
34、nce Supervision information physical link unidirectional connection between the transmitter of one port and the receiver of another port Server Signal Fail (SSF): signal fail indication output at the CP of an adaptation function (adopted from ITU-T Recommendation G. 806) Signal Fail (SF): signal ind
35、icating the associated data has failed in the sense that a near-end defect condition (not being the degraded defect) is active (adopted from ITU-T Recommendation G.806) slot: time slot within the frame being able to transport 64 bit of data or a number of special codes Trail Signal Fail (TSF): signa
36、l fail indication output at the AP of a termination function (adopted from ITU-T Recommendation G. 806) ETSI 8 ETSI ES 201 803-4 VI .I .I (2003-01) 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: A ACT AI AIS AM AP aSSF aTSF BPn BPnP CI CK cTSF D FS MP
37、PM POH PS SDH Sk Sn so SSF S SM STM TS TSF TSP T ST TTI vc vc-4 AU-4 Adapted function Active Adapted Information Alarm Indication Signal Administrative Mode Access Point Server Signal Fail action Trail Signal Fail action Administrative Unit, level 4 Bypass layer type n Bypass layer type n Protection
38、 Characteristic Information ClocK Trail Signal Fail cause Data Frame Start signal Management Point Port Mode Path OverHead Performance Supervision Synchronous Digital Hierarchy Sink SDH higher order VC-n layer (n=3,4,4-Xc) Source Server Signal Fail Synchronization Status Message Synchronous Transpor
39、t Module Time Slot layer Trail Signal Fail Time Slot layer Protection Time Slot layer Tunnel Trail Trace Identifier Virtual Container Virtual Container, level 4 4 Overview The Physical Layer Adaptation (see figure 1) describes the mapping and framing of the slots in the DTM frame synchronously into
40、the SDH VC-4-Xc payload. The functionality is part of the SDH higher order path layer and additional adaptation functions and their inner workings are specified. The transport functionality provides a DTM Timeslot connection over an SDH network as if this where a physical link between the DTM nodes.
41、 DTM slots, which may carry Data, Idle-marker, PS-marker or AIS-marker, is being encoded into a 65 bit format. The 65 bit slot representation is synchronously mapped onto the octet payload of an VC-4-Xc. The VC-4-Xc payload is also scrambled through a self-synchronous scrambler in order to ensure in
42、tegrity. In the receiver end the reverse process is performed. The DTM frame synchronization signal is being transferred over the AU-4 pointer adjustment mechanism. The SDH supervision functionality is mapped over to the DTM functionality and SDH AIS is being encoded into DTM AIS. The DTM supervisio
43、n includes port available supervision, which is being generated out of the SDH supervision signals. ETSI 9 ETSI ES 201 803-4 VI .I .I (2003-01) - Media Layer 1 MIEL1 MIEL1 Figure 1 : Transport Network Reference Model for DTM ETSI 10 ETSI ES 201 803-4 VI .I .I (2003-01) 5 SDH Higher order path/DTM Ph
44、ysical Link layer The SDH Higher order path section (see figure 2) provides adaptation for higher speeds PDH, ATM, HDLC, FDDI and DTM signals and multiplexing adaptation for SDH lower order part section. Only the DTM signal will be detailed in this clause. I BP2-CP t Figure 2: SDH Higher order path
45、section atomic functions (relating to DTM mapping) The Characteristic Information and Adapted Information is defined in 7, clause 12. Modelling is according to ITU-T Recommendation G.806 9 with the exception of DTM specific modifications. These modifications is relating to: DTM layer labelling (BP2
46、for the DTM Bypass layer, type 2). Administrative Mode. Use of a signal (aTSF Trail Server Fail action) to the dynamic management protocols of DTM. The Administrative Mode (AM) signal is sent to a port in order to control the administrative status as being enabled or disabled (or optionally auto). T
47、his signal control the administrative state machine having the states Active (ACT), Not Active (NACT) or optionally Automatic Active (AACT). The state machine is equivalent to that of the port mode as defiied in ITU-T Recommendation G.806 9. 5.1 Connection function The SDH VC-n (n=4,4-Xc) interconne
48、ction between input and output VC-n ports. See Sn connection function in 7, clause 12.1 and 2, clause 4.1. 5.2 Termination functions The SDH VC-n (n4, 4-Xc) trail termination functions. See Sn trail termination function in 7, clause 12.2 and 2, clause 4.2. ETSI 11 Input(s) ETSI ES 201 803-4 VI .I .I
49、 (2003-01) Output(s) 5.3 5.3.1 5.3.1 .I Symbols Ad apta t io n f u n ct ions SDH VC-n to DTM Bypass layer type 2 Adaptation S4/BP2-A SDH VC-n to DTM Bypass layer type 2 Adaptation source S4/BP2_A_So BP2-CI S4lBP2 * Figure 3: DTM Bypass layer type 2 to SDH Higher order path layer Adaptation function Source Interfaces Table 1: S4/BP2-A-So Input and output signals - - BP2-CI-CK I S4-AI-CK BP2-CI-FS I S4-AI-FS Processes The DTM frame synchronization transmission is achieved by letting the DTM BP2-CI-FS signal trigger the S4AI_FS, i.e. by genera
