1、 ETSI ES 201 803-13 V1.1.1 (2005-01)ETSI Standard Dynamic synchronous Transfer Mode (DTM);Part 13: System description of sub-rate DTMETSI ETSI ES 201 803-13 V1.1.1 (2005-01) 2 Reference DES/TISPAN-02004-DTM Keywords DTM, rate ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.:
2、+33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copies of the present document can be downloaded from: http:/www.etsi.org The present document may be made ava
3、ilable in more than one electronic version or in print. In any case 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 on
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5、errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction i
6、n all media. European Telecommunications Standards Institute 2005. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTMand the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GP
7、PTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI ES 201 803-13 V1.1.1 (2005-01) 3 Contents Intellectual Property Rights4 Foreword.4 Introduction 5 1 Scope 6 2 References 6 3 Definitions and abbreviations.6 3.1 Definitions6 3.2 A
8、bbreviations .7 4 Overview 7 5 Time Slot sub-rate sub-layer (TSs) 7 5.1 Access point information8 5.1.1 Characteristic Information 8 5.1.2 Adapted Information.8 5.1.3 Management Information .8 5.1.4 Timing Information.9 5.2 Connection function (TSs_C).9 5.2.1 Drop switching9 5.2.2 Space switching 9
9、5.2.3 Sub-rate Time Slot Transport switching .9 5.3 Trail Termination functions (TSs_TT).9 5.3.1 Sub-rate Time Slot Trail Termination function (TSs_TT)9 5.3.1.1 Sub-rate Time Slot Trail Termination Source function (TSs_TT_So)10 5.3.1.2 Sub-rate Time Slot Trail Termination Sink function (TSs_TT_Sk)11
10、 5.4 Adaptation functions 12 5.4.1 Time Slot to sub-rate Time Slot Adaptation function (TS/TSs_A).12 5.4.1.1 Time Slot to sub-rate Time Slot Adaptation Source function (TS/TSs_A_So).12 5.4.1.2 Time Slot to sub-rate Time Slot Adaptation Sink function (TS/TSs_A_Sk) 13 5.4.2 Sub-rate Time Slot to Chann
11、el 1 Adaptation function (TSs/CH1_A).14 5.4.2.1 Sub-rate Time Slot to Channel 1 Adaptation Source function (TSs/CH1_A_So).14 5.4.2.2 Sub-rate Time Slot to Channel 1 Adaptation Sink function (TSs/CH1_A_Sk) 15 6 Sub-rate Time Slot mapping.16 History 18 ETSI ETSI ES 201 803-13 V1.1.1 (2005-01) 4 Intell
12、ectual 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 non-members, and can be found in ETSI SR 000 314: “Intellectual Property Right
13、s (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR
14、 searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This ETSI Standard (ES) has been produced by
15、 ETSI Technical Committee Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN). The present document is part 13 of a multi-part deliverable covering the Dynamic synchronous Transfer Mode (DTM), as identified below: ES 201 803-1: “System description“; ES 2
16、01 803-2: “System characteristics“; ES 201 803-3: “Physical protocol“; ES 201 803-4: “Mapping of DTM frames into SDH containers“; ES 201 803-5: “Mapping of PDH over DTM“; ES 201 803-6: “Mapping of Synchronous Digital Hierarchy (SDH) over DTM“; ES 201 803-7: “Ethernet over DTM Mapping“; ES 201 803-9:
17、 “Mapping of ATM over DTM“; TR 101 803-10: “Routeing and switching of IP traffic over DTM“; ES 201 803-11: “Mapping of video streams over DTM“; ES 201 803-12: “Mapping of MPLS over DTM“; ES 201 803-13: “System description of sub-rate DTM“. ETSI ETSI ES 201 803-13 V1.1.1 (2005-01) 5 Introduction Dyna
18、mic synchronous Transfer Mode (DTM) is a time division multiplex and a circuit-switched 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 fun
19、damental functions are identified. Part 2 includes system aspects that are mandatory or optional for nodes from different vendors to interoperate. The interworking granularity should be at node level, such that nodes from different vendors can interoperate with regard to well-defined functions. Part
20、 3 specifies the physical layer for physical links based on 8B10B encoding. Part 4 describes how DTM frames are mapped onto SDH containers. The transport of various tributary signals is specified for PDH (part 5), SDH (part 6), Ethernet (part 7), ATM (part 9), IP (part 10), video streaming (part 11)
21、 and MPLS (part 12). Subrate DTM is described in part 13. ETSI ETSI ES 201 803-13 V1.1.1 (2005-01) 6 1 Scope The present document: specifies a method for mapping sub-rate time slots over normal time slot channels; specifies the characteristics of critical parameters for mapping sub-rate time slots o
22、ver normal time slot channels; gives the terms and definitions for mapping encoding and decoding. 2 References 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 publi
23、cation and/or edition number 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 http:/d
24、ocbox.etsi.org/Reference. 1 ETSI ES 201 803-1: “Dynamic synchronous Transfer Mode (DTM); Part 1: System description“. 2 ETSI ES 201 803-2-3: “Dynamic synchronous Transfer Mode (DTM); Part 2: System characteristics; Sub-part 3: Transport network and channel adaptation aspects“. 3 ETSI ES 201 803-2-1:
25、 “Dynamic synchronous Transfer Mode (DTM); Part 2: System characteristics; Sub-part 1: Data link aspects“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: sub-rate DTM: subsystem of DTM providing a fractional slot c
26、apacity as channel capacity resolution sub-rate time slot: time slot in a sub-rate DTM super-frame super-frame: multi-frame TDM structure NOTE: Each frame is usually numbered, starting from the first frame in the multi-frame. ETSI ETSI ES 201 803-13 V1.1.1 (2005-01) 7 3.2 Abbreviations For the purpo
27、ses of the present document, the following abbreviations apply: A Adaptation function AP Access Point C Connection function CHn CHannel layer type n CI Characteristic Information CK ClocK CMI Channel Multiplex Identifier CMT Channel Map Table CP Connection Point D Data DTM Dynamic synchronous Transf
28、er Mode FS Frame Start signal MI Management Information MP Management Point SMT Slot Map Table SSF Server Signal Fail TI Timing Information TP Timing Point TS Time Slot layer TSF Trail Signal Fail TSs sub-rate Time Slot sub-layer TT Trail Termination4 Overview The sub-rate DTM system creates an over
29、lay network over the normal DTM functionality, allowing channels to be created with a fractional capacity resolution compared to that of the normal 512 kb/s of the DTM system (ES 201 803-1 1). This enables efficient use of capacity for channels only requiring a fractional of the capacity and enables
30、 the same features for these channels as ordinary DTM channels allows. This overlay network is transported in ordinary time slot channels similar to tunnels, but with the distinct difference that the content is time-multiplexed inside the channel. In the overlay network only sub-rate enabled switche
31、s will be able to switch on the sub-rate layer, but the transport can occur through any number of normal DTM switches. Signalling of channels occurs using the normal DTM signalling mechanism, but for the overlay network instead of the physical network. The sub-rate system providing the sub-rate time
32、 slot capacity of 8 kb/s will be detailed in the present document. Other sub-rates could be allowed in the future. Interaction between different sub-rates is however not directly achievable. A sub-rate of 8 kb/s will use a 64thpart of a normal 512 kb/s slot capacity. In order to maintain the existin
33、g protocols, the DTM slot format is unchanged, but the frame rate is changed within the channel. 5 Time Slot sub-rate sub-layer (TSs) The sub-rate DTM system creates a dedicated hierarchical layer in DTM adding a Time Slot sub-rate (TSs) sub-layer in the Time Slot (TS) (ES 201 803-2-3 2) layer (see
34、figure 1). The sub-layer is placed over the normal Time Slot layer, but under the normal Channel layer, such that the existing channel and application functionalitys can be utilized, but using a lower rate interface. ETSI ETSI ES 201 803-13 V1.1.1 (2005-01) 8 TSTS_APTSs_CPTS_CPTSTS/TSsTSTS/TSsTSsTSs
35、TSs/CHnTSsTSs/CHnCHn_CPFigure 1: Time Slot sub-rate sub-layer atomic functions 5.1 Access point information 5.1.1 Characteristic Information The Characteristic Information (CI) of the Connection Point (CP) is: the sub-rate time slot TDM frame TSs_CI_D being an integer multiple of sub-rate slots; the
36、 sub-rate time slot data clock timing TSs_CI_CK; the sub-rate time slot data super-frame start TSs_CI_FS; the sub-rate time slot data trail signal fail signal TSs_CI_SSF. 5.1.2 Adapted Information The Adapted Information (AI) of the Adaptation Point (AP) is: the sub-rate time slot TDM frame TSs_AI_D
37、 being an integer multiple of sub-rate slots; the sub-rate time slot data clock timing TSs_AI_CK; the sub-rate time slot data super-frame start TSs_AI_FS; the sub-rate time slot data trail signal fail signal TSa_AI_SSF. 5.1.3 Management Information The Management Information (MI) of the Management P
38、oint (MP) is: the connection function drop switching sub-rate time slot channel map table TSs_C_MI_CMTd; the connection function space sub-rate switching time slot channel map table TSs_C_MI_CMTs; the connection function sub-rate transport switching time slot channel map table TS_C_MI_CMTsr; ETSI ET
39、SI ES 201 803-13 V1.1.1 (2005-01) 9 the trail termination function server signal fail cause TSs_TT_Sk_MI_cSSF; the adaptation function source tunnelling slot map table TS/TSs_A_So_MI_SMT; the adaptation function sink tunnelling slot map table TS/TSs_A_Sk_MI_SMT. 5.1.4 Timing Information The Timing I
40、nformation (TI) of the Timing Point (TP) is: the sub-rate time slot data clock timing indication TSs_TI_CK; the sub-rate time slot super-frame start timing indication TSs_TI_FS. 5.2 Connection function (TSs_C) The connection function of the sub-rate time slot layer (TSs_C) provides support for dropp
41、ing traffic and space switching. The connection function of the time slot layer (TS_C) has an additional functionality added. 5.2.1 Drop switching The connection function provides for drop switching of a channel by allowing the switching from an incoming channel to a sub-rate time slot trail termina
42、tion. This switching is performed when the slot is marked for drop switching in the TSs_C_MI_CMTd. 5.2.2 Space switching The connection function provides for space switching of sub-rate time slot channels TDM frame from an incoming channel to that of an outgoing channel. The channel source for an ou
43、tgoing channel is specified in the TSs_C_MI_CMTs. 5.2.3 Sub-rate Time Slot Transport switching The connection function provides for sub-rate time slot transport switching over the underlying time slot channel. It provides a sub-rate time slot channel with associated mapping to allow multiple sub-rat
44、e time slot channels to be transported through a single time slot channel. On the source side is the tunnelled sub-rate time slot channels switched through the source TS/TSs adaptation function and TS trail termination. The output of the trail termination is then switched to the underlying time slot
45、 channel which may be space, protected or tunnel switched. On the sink side is the time slot channel switched to the sink TS trail terminator and sink TS/TSs adaptation function. The output of the TS/TSs adaptation function provides the individual sub-rate time slot channels that where transported.
46、These may be drop or switched. The sub-rate time slot transport switch is controlled by the management signal TS_C_MI_CMTsr. 5.3 Trail Termination functions (TSs_TT) The trail termination functions are empty mappings between AI and CI. 5.3.1 Sub-rate Time Slot Trail Termination function (TSs_TT) The
47、 sub-rate time slot sub-rate trail termination provides the supervision of a sub-rate time slot channel over a time slot trail. ETSI ETSI ES 201 803-13 V1.1.1 (2005-01) 105.3.1.1 Sub-rate Time Slot Trail Termination Source function (TSs_TT_So) Symbol: TSsTSs_AITSs_CIFigure 2: Sub-rate Time Slot Trai
48、l Termination Source (TSs_TT_So) Interfaces: Table 1: TSs_TT_So Input and output signals Input(s) Output(s) TSs_AI_D TSs_CI_DTSs_AI_CK TSs_CI_CK TSs_AI_FS TSs_CI_FS TSs_AI_TSF TSs_CI_SSF Processes and anomalies: None. Defects: None. Consequent actions: None. Defect correlation: None. Performance mon
49、itoring: None. Output mapping: TSs_CI_D TSs_AI_D. TSs_CI_CK TSs_AI_CK. TSs_CI_FS TSs_AI_FS. TSs_CI_SSF TSs_AI_TSF. Fault management: None. Long term performance monitoring: None. ETSI ETSI ES 201 803-13 V1.1.1 (2005-01) 115.3.1.2 Sub-rate Time Slot Trail Termination Sink function (TSs_TT_Sk) Symbol: TSsTSs_AITSs_TT_Sk_MITSs_CIFigure 3: Sub-rate Time Slot Trail Termination Sink (TSs_TT_Sk) Interfaces: Table 2: TSs_TT_Sk Input and output signals Input(s) Output(s) TSs_CI_D TSs_AI_D TSs_CI_CK TSs_AI_CK TSs_CI_FS TSs_AI
