ETSI EN 300 417-6-1 V1.1.3 (1999-05)
Transmission and Multiplexing (TM); Generic requirements of transport functionality of equipment; Part 6-1: Synchronization layer functions
Transmission and Multiplexing (TM); Generic requirements of transport functionality of equipment; Part 6-1: Synchronization layer functions
REN/TM-01015-6-1a
Prenos in multipleksiranje (TM) – Generične zahteve za prenosno funkcionalnost opreme – 6-1. del: Funkcije sinhronizacijske plasti
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.XQNFLRQDOQRVWTransmission and Multiplexing (TM); Generic requirements of transport functionality of equipment; Part 6-1: Synchronization layer functions33.040.20Prenosni sistemTransmission systemsICS:Ta slovenski standard je istoveten z:EN 300 417-6-1 Version 1.1.3SIST EN 300 417-6-1 V1.1.3:2003en01-december-2003SIST EN 300 417-6-1 V1.1.3:2003SLOVENSKI
STANDARD
SIST EN 300 417-6-1 V1.1.3:2003
EN 300 417-6-1 V1.1.3 (1999-05)European Standard (Telecommunications series)Transmission and Multiplexing (TM);Generic requirements of transport functionality of equipment;Part 6-1: Synchronization layer functionsSIST EN 300 417-6-1 V1.1.3:2003
ETSIEN 300 417-6-1 V1.1.3 (1999-05)2ReferenceREN/TM-01015-6-1a (3v1i9ie0.PDF)KeywordsSDH, transmission, synchronizationETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/88Internetsecretariat@etsi.frhttp://www.etsi.orgCopyright NotificationNo part may be reproduced except as authorized by written permission.The copyright and the foregoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1998.All rights reserved.SIST EN 300 417-6-1 V1.1.3:2003
ETSIEN 300 417-6-1 V1.1.3 (1999-05)3ContentsIntellectual Property Rights.6Foreword.61Scope.82References.83Definitions, abbreviations and symbols.93.1Definitions.93.2Abbreviations.103.3Symbols and diagrammatic conventions.113.4Introduction.114Synchronization principles.114.1Network synchronization.114.2Synchronization distribution trails.134.3Synchronization interfaces.134.3.1Synchronous Transport Module, level N (STM-N).144.3.22 Mbit/s.144.3.32 MHz.144.3.434 Mbit/s and 140 Mbit/s with 125 ms frame structure.144.4Clock-Source Quality-Level.144.4.1Clock-Source Quality- Level Definitions.144.4.2Hierarchy of Clock-Sources Quality Level or (CS_QL).154.4.3Forcing of Clock-Source Quality-Levels.154.5SSM and TM channels.154.5.1SSM and TM message sets.164.5.2SSM and TM code word generation.164.5.3SSM and TM code word interpretation.174.6Selection process.184.7Signal fail.184.8Hold-off time.194.9WTR time.194.10Synchronization source priorities.194.11External commands (EXTCMD).204.11.1EXTCMDs per nominated synchronization source.204.11.1.1Set_Lockout#p command.204.11.1.2Clear_Lockout#p command.204.11.2EXTCMDs per selection process.204.11.2.1CLR command.204.11.2.2Forced switch #p command.214.11.2.3Manual switch #p command.214.12Automatic reference selection process.214.12.1QL-enabled mode.214.12.2QL-disabled mode.224.13Timing loop prevention.224.13.1Station clock input used as a source for station clock output.224.13.2Between NEs with SEC type clocks.224.13.3Between NEs with a SEC clock and a NE or SASE with a SSU clock and only one link.234.13.3.1QL/SSM processing supported between SASE and NE.234.13.3.2QL/SSM processing not supported between SASE and NE.254.13.4Between NEs with a SEC clock and a NE or SASE with a SSU clock and several links.274.14Delay times for NEs with SEC.274.15Delay times for NEs with SSU or for SASE.284.16Synchronization layer functions.284.17Overview of the processes performed within the atomic functions.30SIST EN 300 417-6-1 V1.1.3:2003
ETSIEN 300 417-6-1 V1.1.3 (1999-05)45Synchronization distribution layer atomic functions.315.1SD Connection function (SD_C).325.2SD Trail Termination (TT) functions.335.2.1SD TT source function (SD_TT_So).335.2.2SD TT sink function (SD_TT_Sk).345.3SD adaptation functions.365.3.1SD layer to NS layer SEC quality adaptation source function (SD/NS-SEC-A_So).365.3.2SD layer to NS layer SEC quality adaptation sink function (SD/NS-SEC_A_Sk).405.3.3SD layer to NS layer SSU quality adaptation source function (SD/NS-SSU-A_So).415.3.4SD layer to NS layer SSU quality adaptation sink function (SD/NS-SSU_A_Sk).415.3.5SD layer to NS layer PRC quality adaptation source function (SD/NS-PRC-A_So).415.3.6SD layer to NS layer adaptation source function (SD/NS_A_So).416NS layer atomic functions.436.1NS_connection functions (NS_C).437TL to SD layer atomic function.467.1STM-1 multiplex section adaptation functions.467.1.1STM-1 multiplex section to sd adaptation source (MS1/SD_A_So).467.1.2STM-1 multiplex section to SD adaptation sink (MS1/SD_A_Sk).487.2STM-4 multiplex section adaptation functions.497.2.1STM-4 multiplex section to SD adaptation source (MS4/SD_A_So).497.2.2STM-4 multiplex section to SD adaptation sink (MS4/SD_A_Sk).517.3STM-16 multiplex section adaptation functions.537.3.1STM-16 multiplex section to SD adaptation source (MS16/SD_A_So).537.3.2STM-16 multiplex section to SD adaptation sink (MS16/SD_A_Sk).557.4P31s adaptation functions.567.4.1P31s to SD adaptation source (P31s/SD_A_So).567.4.2P31s to SD adaptation sink (P31s/SD_A_Sk).587.5P4s adaptation functions.607.5.1P4s to SD adaptation source (P4s/SD_A_So).607.5.2P4s to SD adaptation sink (P4s/SD_A_Sk).637.6P12s layer adaptation functions.657.6.1P12s layer adaptation source functions.657.6.1.1Type 1 P12s to SD adaptation source for station clock output supporting SSM (P12s/SD-sc-1_A_So).657.6.1.2Type 2 P12s to SD adaptation source for station clock output port not supporting SSM (P12s/SD-sc-2_A_So).687.6.2P12s layer adaptation sink functions.707.6.2.1Type 1 P12s to SD adaptation sink for traffic input port (P12s/SD-tf_A_Sk).707.6.2.2Type 2 P12s to SD adaptation sink for station clock input port (P12s/SD-sc_A_Sk).727.7T12 layer adaptation functions.747.7.1T12 to SD adaptation source (T12/SD_A_So).747.7.2T12 to SD adaptation sink (T12/SD_A_Sk).768Equipment clock to TLs clock adaptation functions.788.1STM-N layer.788.1.1STM-1 Layer Clock (LC) adaptation source (MS1-LC_A_So).788.1.2STM-4 LC adaptation source (MS4-LC_A_So).798.1.3STM-16 LC adaptation source (MS16-LC_A_So).808.2VC layers.818.2.1VC-4 LC adaptation source (S4-LC_A_So).818.2.2VC-3 LC adaptation source (S3-LC_A_So).828.2.3VC-2 LC adaptation source (S2-LC_A_So).838.2.4VC-12 LC adaptation source (S12-LC_A_So).848.2.5VC-11 LC adaptation source (S11-LC_A_So).858.3Pxx layers.868.3.1P4s LC adaptation source (P4s-LC_A_So).868.3.2P31s LC adaptation source (P31s-LC_A_So).878.3.3P12s LC adaptation source (P12s-LC_A_So).888.4T12 layer.89SIST EN 300 417-6-1 V1.1.3:2003
ETSIEN 300 417-6-1 V1.1.3 (1999-05)58.4.1T12 LC adaptation source (T12-LC_A_So).89Annex A (normative):Synchronization selection process.90Annex B (informative):TL models for synchronization information.101Annex C (informative):Examples of synchronization functionality in the NE.104Annex D (informative):Delay time allocation.107D.1Delay and processing times for the synchronization selection process.107D.2Non switching message delay TNSM.108D.3Switching message delay TSM.108D.4Holdover message delay THM.109D.5Wait to restore time TWTR.110Annex E (informative):Overview of inputs/outputs to the atomic functions.111Bibliography.112History.113SIST EN 300 417-6-1 V1.1.3:2003
ETSIEN 300 417-6-1 V1.1.3 (1999-05)6Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respectof ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on theETSI Web server (http://www.etsi.org/ipr).Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guaranteecan be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by ETSI Technical Committee Transmissionand Multiplexing (TM).The present document is one of a family of documents that has been produced in order to provide inter-vendor andinter-operator compatibility of Synchronous Digital Hierarchy (SDH) equipment.The present document is part 6-1 of a multi-part EN covering the generic requirements of transport functionality ofequipment, as identified below:Part 1-1:"Generic processes and performance".Part 1-2:"General information about Implementation Conformance Statement (ICS) proforma".Part 2-1:"Synchronous Digital Hierarchy (SDH) and Plesiochronous Digital Hierarchy (PDH) physical sectionlayer functions".Part 2-2:"Synchronous Digital Hierarchy (SDH) and Plesiochronous Digital Hierarchy (PDH) physical sectionlayer functions; Implementation Conformance Statement (ICS) proforma specification".Part 3-1:"Synchronous Transport Module-N (STM-N) regenerator and multiplex section layer functions".Part 3-2:"Synchronous Transport Module-N (STM-N) regenerator and multiplex section layer functions;Implementaion Conformance Statement (ICS) proforma specification".Part 4-1:"Synchronous Digital Hierarchy (SDH) path layer functions".Part 4-2:"Synchronous Digital Hierarchy (SDH) path layer functions; Implementation Conformance Statement(ICS) proforma specification".Part 5-1:"Plesiochronous Digital Hierarchy (PDH) path layer functions".Part 5-2:"Plesiochronous Digital Hierarchy (PDH) path layer functions; Implementation Conformance Statement(ICS) proforma specification".Part 6-1:"Synchronization layer functions".Part 6-2:"Synchronization layer functions; Implementation Conformance Statement (ICS) proforma specification".Part 7-1:"Auxiliary layer functions".Part 7-2:"Auxiliary layer functions; Implementation Conformance Statement (ICS) proforma specification".Parts 2 to 7 specify the layers and their atomic functions.NOTE 1:The present document does not currently address configuration management.NOTE 2:The SDH radio equipment functional blocks are addressed by ETSI WG TM4.Various of the above parts have previously been published as parts of ETS 300 417.SIST EN 300 417-6-1 V1.1.3:2003
ETSIEN 300 417-6-1 V1.1.3 (1999-05)7They have been converted into parts of EN 300 417 without technical changes, but some editorial changes have beennecessary (e.g. references). In particular:-Parts 2-1, 2-2 and 3-2 have been modified to take account of editorial errors present in edition 1.-Part 1-1 has had its title change of to align with other parts published at a later date.Also note that in the meantime parts 8-1 and 8-2 together will all parts x-3 (Abstract Test Suites) have been stopped.This version of the present document has been published because the previous version had incorrect dates in thetransposition table.National transposition datesDate of latest announcement of this EN (doa):31 August 1999Date of latest publication of new National Standardor endorsement of this EN (dop/e):29 February 2000Date of withdrawal of any conflicting National Standard (dow):29 February 2000SIST EN 300 417-6-1 V1.1.3:2003
ETSIEN 300 417-6-1 V1.1.3 (1999-05)81ScopeThe present document specifies a library of basic Synchronization Distribution (SD) building blocks, referred to as"atomic functions" and a set of rules by which they are combined in order to describe a digital transmission equipment.The library defined in the present document forms part of the set of libraries defined in EN 300 417 series. The librarycomprises the functional building blocks needed to completely specify the generic functional structure of the Europeandigital transmission hierarchy. Equipment that is compliant with the present document should be describable as aninterconnection of a subset of these functional blocks contained within the present document. The interconnection ofthese blocks should obey the combination rules given in EN 300 417. The generic functionality is described inEN 300 417-1-1 [6].The present document assumes that there are only two types of Synchronization Supply Units (SSUs), transit and local,as currently defined in CCITT Recommendation G.812 [17]. However, STC TM3 has approved in September 1996 anew SSU with enhanced characteristics. The inclusion of such an SSU in the present document is for further study.The present document does not specify the atomic functions that are specific to SSU and Primary Reference Clock(PRC); the Synchronization Status Message (SSM) selection algorithm specified in the present document applies only toSEC's.2ReferencesThe following documents contain provisions which, through reference in this text, constitute provisions of the presentdocument.· References are either specific (identified by date of publication, edition number, version number, etc.) ornon-specific.· For a specific reference, subsequent revisions do not apply.· For a non-specific reference, the latest version applies.· A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the samenumber.[1]ETS 300 147: "Transmission and Multiplexing (TM); Synchronous Digital Hierarchy (SDH);Multiplexing structure".[2]ETS 300 166 (1993): "Transmission and Multiplexing (TM); Physical and electrical characteristicsof hierarchical digital interfaces for equipment using the 2 048 kbit/s - based plesiochronous orsynchronous digital hierarchies".[3]ETS 300 167: "Transmission and Multiplexing (TM); Functional characteristics of 2 048 kbit/sinterfaces".[4]ETS 300 337 (1996): "Transmission and Multiplexing (TM); Generic frame structures for thetransport of various signals (including Asynchronous Transfer Mode (ATM) cells and SynchronousDigital Hierarchy (SDH) elements) at the ITU-T Recommendation G.702 hierarchical rates of2 048 kbit/s, 34 368 kbit/s and 139 264 kbit/s".[5]ETS 300 337 (1995): "Transmission and Multiplexing (TM); Generic frame structures for thetransport of various signals (including Asynchronous Transfer Mode (ATM) cells and SynchronousDigital Hierarchy (SDH) elements) at the ITU-T Recommendation G.702 hierarchical rates of2 048 kbit/s, 34 368 kbit/s and 139 264 kbit/s".[6]EN 300 417-1-1: "Transmission and Multiplexing (TM); Generic requirements of transportfunctionality of equipment; Part 1-1: Generic processes and performance".[7]EN 300 417-2-1: "Transmission and Multiplexing (TM); Generic requirements of transportfunctionality of equipment; Part 2-1: Synchronous Digital Hierarchy (SDH) and PlesiochronousDigital Hierarchy (PDH) physical section layer functions".SIST EN 300 417-6-1 V1.1.3:2003
ETSIEN 300 417-6-1 V1.1.3 (1999-05)9[8]EN 300 462-1-1: "Transmission and Multiplexing (TM); Generic requirements for synchronizationnetworks; Part 1-1: Definitions and terminology for synchronization networks".[9]EN 300 462-2-1: "Transmission and Multiplexing (TM); Generic requirements for synchronizationnetworks; Part 2-1: Synchronization network architecture".[10]EN 300 462-4-1: "Transmission and Multiplexing (TM); Generic requirements for synchronizationnetworks; Part 4-1: Timing characteristics of slave clocks suitable for synchronization supply toSynchronous Digital Hierarchy (SDH) and Plesiochronous Digital Hierarchy (PDH) equipment".[11]EN 300 462-5-1: "Transmission and Multiplexing (TM); Generic requirements for synchronizationnetworks; Part 5-1: Timing characteristics of slave clocks suitable for operation in SynchronousDigital Hierarchy (SDH) equipment".[12]EN 300 462-6-1: "Transmission and Multiplexing (TM); Generic requirements for synchronizationnetworks; Part 6-1: Timing characteristics of primary reference clocks".[13]ITU-T Recommendation G.704 (1995): "Synchronous frame structures used at 1 544, 6 312,2 048, 8 488 and 44 736 kbit/s hierarchical levels".[14]ITU-T Recommendation G.707 (1996): "Network node interface for the synchronous digitalhierarchy (SDH)".[15]ITU-T Recommendation G.783: "Characteristics of synchronous digital hierarchy (SDH)equipment functional blocks".[16]CCITT Recommendation G.811 (1988): "Timing requirements at the outputs of primary referenceclocks suitable for plesiochronous operation of international digital links".[17]CCITT Recommendation G.812 (1988.): "Timing requirements at the outputs of slave clockssuitable for plesiochronous operation of international digital links".[18]ITU-T Recommendation G.813 (1996): "Timing characteristics of SDH equipment slave clocks(SEC)".3Definitions, abbreviations and symbols3.1DefinitionsFor the purposes of the present document, the following definition applies:Timing loop: This is a network condition where a slave clock providing synchronization becomes locked to its owntiming signal. It is generally created when the slave clock Timing Information (TI) is looped back to its own input, eitherdirectly or via other network equipments. Timing loops should be prevented in networks by careful network design.QL minimum: QL_minimum is a configurable parameter used in the squelching of clock output signals. If the QualityLevel (QL) of the signal used to derive the output falls below QL_Minimum then the output will be squelched (cut-offor set to Alarm Indication Signal (AIS)).Clock-Source Quality-Level: The clock-source quality-level of a SDH Equipment Clock (SEC) or Stand AloneSynchronization Equipment (SASE) is defined as the grade of clock to which it is ultimately traceable; i.e. thegrade-of-clock to which it is synchronized directly or indirectly via a chain of SEC's, and SASE's however long thischain of clocks is. For example, the clock-source quality-level may be a PRC complying with EN 300 462-6-1 [12], or itmay be a Slave Clock in holdover-mode, complying with EN 300 462-4-1 [10], or a EN 300 462-5-1 [11] Clock inholdover or free-run.The clock-source quality-level is essentially, therefore, an indication on
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