ETSI EN 301 165 V1.1.1 (1999-05)

Transmission and Multiplexing (TM); Synchronous Digital Hierarchy (SDH); SDH leased lines; Network and terminal interface presentation

DEN/TM-03073

Prenos in multipleksiranje (TM) – Sinhrona digitalna hierarhija (SDH) – Zakupljeni vodi v SDH – Predstavitev omrežnega in terminalskega vmesnika

General Information

• Status: Published
• Publication Date: 11-May-1999
• Technical Committee: TM 3 - Interfaces, architecture and functional requirements of transport netw
• Current Stage: 12 - Completion
• Due Date: 30-Apr-1999
• Completion Date: 12-May-1999
• Mandate: T-324
• Ref Project: SIST EN 301 165 V1.1.1:2003 - Transmission and Multiplexing (TM); Synchronous Digital Hierarchy (SDH); SDH leased lines; Network and terminal interface presentation

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Prenos in multipleksiranje (TM) – Sinhrona digitalna hierarhija (SDH) – Zakupljeni vodi v SDH – Predstavitev omrežnega in terminalskega vmesnikaTransmission and Multiplexing (TM); Synchronous Digital Hierarchy (SDH); SDH leased lines; Network and terminal interface presentation33.040.50Vodi, zveze in tokokrogiLines, connections and circuits33.040.20Prenosni sistemTransmission systemsICS:Ta slovenski standard je istoveten z:EN 301 165 Version 1.1.1SIST EN 301 165 V1.1.1:2003en01-december-2003SIST EN 301 165 V1.1.1:2003SLOVENSKI
STANDARD



SIST EN 301 165 V1.1.1:2003



EN 301 165 V1.1.1 (1999-05)European Standard (Telecommunications series)Transmission and Multiplexing (TM);Synchronous Digital Hierarchy (SDH);SDH leased lines;Network and terminal interface presentationSIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)2ReferenceDEN/TM-03073 (asc00ico.PDF)Keywordsleased line, ONP, SDH, transmissionETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: [phone]
Fax: [phone]Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/[e-mail] copies of this ETSI deliverablecan be downloaded fromhttp://www.etsi.orgIf you find errors in the present document, send yourcomment to: [e-mail] 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 1999.All rights reserved.SIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)3ContentsIntellectual Property Rights.4Foreword.41Scope.52References.63Definitions, symbols and abbreviations.73.1Definitions.73.2Symbols.93.3Abbreviations.104Network and terminal interfaces for Virtual Container (VC) leased line connection.114.1Section layer functions for Network Termination (NT) and Terminal Equipment (TE).114.1.1STM-1 section layers functions for NT and TE.114.1.2STM-4 section layers functions for NT and TE.144.2Path layer functions for NT.154.2.1Network path layer functions for VC-4 leased line connections.154.2.2Network path layer functions for lower order VC leased line connections.154.3Path layers functions for TE.164.3.1Terminal path layer functions for VC-4 leased line connections.164.3.2Terminal path layer functions for lower order VC leased line connections.164.4Mechanical characteristics for NT and TE interfaces.174.4.1Connectors for the electrical STM-1 interface.174.4.2Connectors for optical STM-N interfaces.174.5Safety.184.6AU/TU numbering scheme.185Application of EN 300 417-2-1.186Application of EN 300 417-3-1.207Application of EN 300 417-4-1.228Application of EN 300 417-6-1.28Annex A (informative):Bibliography.30History.31SIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)4Intellectual 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).National transposition datesDate of adoption of this EN:16 April 1999Date of latest announcement of this EN (doa):31 July 1999Date of latest publication of new National Standardor endorsement of this EN (dop/e):31 January 2000Date of withdrawal of any conflicting National Standard (dow):31 January 2000SIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)51ScopeThe present document defines the atomic functions relevant for the interface presentations of Synchronous DigitalHierarchy (SDH) leased lines at the Network Termination Point (NTP) and the Terminal Equipment (TE). It specifiesthe technical requirements for electrical, optical, regenerator and multiplex section layer and SDH path layers. Thespecification is presented as a delta information of the equipment specification of:- EN 300 417-2-1 [9] for STM-1 electrical and optical and STM-4 optical section layer;- EN 300 417-3-1 [10] for STM-1 and STM-4 regenerator section and multiplex section layer;- EN 300 417-4-1 [11] for SDH path layers (VC-4, VC-3, VC-2 and VC-12);- EN 300 417-6-1 [12] for synchronization layer functions.The following physical section layers are used:- STM-1 electrical interface;- STM-1 optical intra-office interface;- STM-1 optical short haul interfaces at 1 300 nm;- STM-4 optical intra-office interface;- STM-4 optical short haul interfaces at 1 300 nm.The interface margins are defined such, that interconnection of different optical interfaces is possible when anappropriate attenuation is inserted.A connection is presented via interfaces at NTPs. The present document defines the network interface as presented bythe leased line provider and should be used in conjunction with the companion standard, EN 301 164 [5], specifying theconnection characteristics between NTPs of the leased line. The present document and the connection characteristicstandard together describe the technical characteristics of the leased line.The present document is applicable for leased lines, including part time leased lines, for which the establishment orrelease does not require any protocol exchange or other intervention at the NTP.The present document is to ensure that the interface of the terminal equipment is compatible with the SDH leased lineinterface. The present document is applicable to all interfaces designed for connection to the SDH leased lines.Customer premises wiring and installation between terminal equipment and the NTP are outside the scope of the presentdocument.The conformance test of the section and path layer functions will be addressed under work items EN 300 417-x-3(x = 2, 3, 4 and 6). Some of the tests described in those ENs are not designed to be applied to the interface of aninstalled leased line; such tests may be applied to equipment of the kind used to provide the interface. The presentdocument does not include extra details concerning the implementation of tests, nor does it include information of anyrelevant regulations. The present document does not specify the circumstances in which the tests given inEN 300 417-x-3 (x = 2, 3, 4 and 6) are to be performed.SIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)62ReferencesThe 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]EN 60950 (1992): "Safety of information technology equipment, including electrical businessequipment".[2]IEC 60169-8 (1978): "Radio-frequency connectors - Part 8: R.F. coaxial connectors with innerdiameter of outer conductor 6.5 mm (0.256 in) with bayonet lock - Characteristic impedance50 ohms (Type BNC)".[3]IEC 60169-13 (1976): "Radio-frequency connectors - Part 13: R.F. coaxial connectors with innerdiameter of outer conductor 5.6 mm (0.22 in) - Characteristic impedance 75 ohms (Type 1.6/5.6). -Characteristic impedance 50 ohms (Type 1.8/5.6) with similar mating dimensions".[4]ISO/IEC 10173 (1998): "Information technology - Telecommunications and information exchangebetween systems - Interface connector and contact assignments for ISDN primary rate accessconnector located at reference points S and T".[5]EN 301 164: "Transmission and Multiplexing (TM); Synchronous Digital Hierarchy (SDH); SDHleased lines; Connection characteristics".[6]ETS 300 147 (1997): "Transmission and Multiplexing (TM); Synchronous Digital Hierarchy(SDH); Multiplexing structure".[7]Void.[8]EN 300 417-1-1: "Transmission and Multiplexing (TM); Generic requirements of transportfunctionality of equipment; Part 1-1: Generic processes and performance".[9]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".[10]EN 300 417-3-1: "Transmission and Multiplexing (TM); Generic requirements of transportfunctionality of equipment; Part 3-1: Synchronous Transport Module-N (STM-N) regenerator andmultiplex section layer functions".[11]EN 300 417-4-1: "Transmission and Multiplexing (TM); Generic requirements of transportfunctionality of equipment; Part 4-1: Synchronous Digital Hierarchy (SDH) path layer functions".[12]EN 300 417-6-1: "Transmission and Multiplexing (TM); Generic requirements of transportfunctionality of equipment; Part 6-1: Synchronization layer functions".[13]ITU-T Recommendation G.825 (1993): "The control of jitter and wander within digital networkswhich are based on the synchronous digital hierarchy (SDH)".[14]ITU-T Recommendation G.704 (1995): "Synchronous frame structures used at 1544, 6312, 2048,8488 and 44 736 kbit/s hierarchical levels".[15]IEC 60364-5-548: "Electrical installations of buildings - Part 5: Selection and erection of electricalequipment - Section 548: Earthing arrangements and equipotential bonding for informationtechnology installations".SIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)73Definitions, symbols and abbreviations3.1DefinitionsFor the purposes of the present document, the following terms and definitions apply.process: generic term for an action or a collection of actionsfunction: "process" defined for digital transmission hierarchies (e.g. Plesiochronous Digital Hierarchy (PDH),Synchronous Digital Hierarchy (SDH)) which acts on a collection of input information to produce a collection of outputinformation. A function is distinguished by the way in which characteristics of the collection, or of members of thecollection of output information differ from characteristics of members of the collection of input informationatomic function: "function" which if divided into simpler "functions" would cease to be uniquely defined for digitaltransmission hierarchies. It is therefore indivisible from a network point of view. The following atomic functions aredefined in each network layer:- bi-directional Trail Termination function (._TT), Trail Termination Source function (._TT_So), TrailTermination Sink function (._TT_Sk) and Connection function (._C);- between client and server layer networks three adaptation functions are defined: Adaptation Sink function._A_Sk, Adaptation Source function ._A_So, and the bi-directional Adaptation function ._Aadaptation function: "atomic function" which passes a collection of information between layer networks by changingthe way in which the collection of information is representedtrail termination function: "atomic function" within a "layer" which generates, adds, and monitors informationconcerning the integrity and supervision of "adapted information"connection function: "atomic function" within a layer which, if connectivity exists, relays a collection of items ofinformation between groups of atomic functions. It does not modify the members of this collection of items ofinformation although it may terminate any switching protocol information and act upon it. Any connectivity restrictionsbetween inputs and outputs shall be statedlayer: concept used to allow the transport network functionality to be described hierarchically as successive levels; eachlayer being solely concerned with the generation and transfer of its "characteristic information"client/server layer: any two adjacent network layers are associated in a client/server relationship. Each transportnetwork layer provides transport to the layer above and uses transport from the layers below. The layer providingtransport is termed a "server", the layer using transport is termed "client"Remote Defect Indication (RDI): signal which conveys the defect status of the characteristic information received bythe Trail Termination sink function back to the network element which contains the characteristic informationoriginating trail termination source function.Examples of RDI signals are the Far End Receive Failure (FERF) bit(s) in SDH signals, the A-bit inITU-T Recommendation G.704 [14] structured 2 048 kbit/s signals and the alarm indication bit in other PDH multiplexsignalsRemote Error Indication (REI): signal which conveys either the exact or truncated number of error detection codeviolations within the characteristic information (as detected by the trail termination sink function) back to the networkelement which contains the characteristic information originating trail termination source function.Examples of REI signals are the Far End Block Error (FEBE) bit(s) in SDH signals and the E-bit inITU-T Recommendation G.704 [14] structured 2 048 kbit/s signalsall-ONEs: entire capacity of the adapted or characteristic information is set to logic "1"AU-4-AIS: STM-N signal in which the entire capacity of an Administrative Unit 4 (AU-4) is set to logic "1"TU-m-AIS: STM-N signal in which the entire capacity of a TU-m is set to logic "1"SIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)8Characteristic Information (CI): signal of specific rate and format which is transferred within and between"sub-networks", and presented to an "adaptation" function for "transport" by the server layer networkRemote Information (RI): information flow from sink direction to source direction of the same atomic function inunidirectional representation, containing information to be transported to the remote end, such as RDI and REIAccess Point (AP): "reference point" where the output of an "adaptation" source function is bound to the input of a"Trail Termination (TT) source", or where the output of a "trail termination sink" is bound to the input of an"adaptation" sink function. The "access point" is characterized by the adapted client layer "characteristic information"which passes across it. A bi-directional "access point" is formed by an associated contra-directional pairConnection Point (CP): "reference point" where the output of a "trail termination source" or a "connection" is bound tothe input of another "connection", or where the output of a "connection" is bound to the input of a "trail terminationsink". The "connection point" is characterized by the information which passes across it. A bi-directional "connectionpoint" is formed by the association of a contra-directional pairNOTE 1:In the information model the connection point is called Connection Termination Point (CTP).Termination Connection Point (TCP): special case of a "connection point" where a "trail termination" function isbound to an "adaptation" function or a "connection" functionNOTE 2:In the information model the termination connection point is called Trail Termination Point (TTP).defect: density of anomalies has reached a level where the ability to perform a required function has been interrupted.Defects are used as input for performance management, the control of consequent actions, and the determination of faultcauseSIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)93.2SymbolsFor the purposes of the present document, the following symbols apply:The diagrammatic conventions and nomenclature used in the present document for adaptation, termination andconnection functions (used to describe the atomic functions) are taken from EN 300 417-1-1 [8] and are shown inFigure 1.SinkSinkSourceSourcebidirectionalbidirectionalbidirectionalunidirectionalAdaptation functions from Server layer Y to Client layer ZY/ZY/ZY/ZYYYTrail Termination functions in layer YConnection functions in layer YYYY/ZYY/ZYY/ZYbidirectionalSourceSinkTrail Termination function in layer Y and Adaptation function to layer ZSinkSourcebidirectionalCompound Adaptation functions from Server layer Y to Client layer ZY/ZY/ZY/ZNOTE:If the above symbols are used for generic figures, i.e. not for specific layers, the layer references Y and Zmay be omitted. Alternatively, the references may be to the type of function or layer, e.g. supervision,protection.Figure 1: Symbols and diagrammatic conventionsSIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)103.3AbbreviationsFor the purposes of the present document, the following abbreviations apply:AAdaptation functionAIAdapted InformationAISAlarm Indication SignalAPAccess PointAUAdministrative UnitAU-nAdministrative Unit, level nAUGAdministrative Unit GroupCConnection functionCICharacteristic InformationCPConnection PointCTPConnection Termination PointESElectrical SectionES1STM-1 Electrical SectionFEBEFar End Block ErrorFERFFar End Receive FailureIInformativeLCLayer ClockLOFLoss Of FrameLOMLoss Of MultiframeLOPLoss Of PointerLOSLoss Of SignalMSMultiplex SectionMS1STM-1 Multiplex SectionMS4STM-4 Multiplex SectionNNormativeN/RNot RelevantNNINetwork Node InterfaceNTNetwork TerminationNTPNetwork Termination PointOSOptical SectionOS1STM-1 Optical SectionOS4STM-4 Optical SectionPDHPlesiochronous Digital HierarchyPLMPayLoad MismatchRDIRemote Defect IndicationREIRemote Error IndicationRIRemote InformationRSRegenerator SectionRS1STM-1 Regenerator SectionRS4STM-4 Regenerator SectionRSOHRegenerator Section OverheadS12VC-12 path layerS2VC-2 path layerS3VC-3 path layerS4VC-4 path layerS4/SXVC-4 path layer to lower order VC path layerSDHSynchronous Digital HierarchySkSinkSoSourceSELVSafety Extra Low VoltageSSFServer Signal FailSTMSynchronous Transport ModuleSTM-NSynchronous Transport Module, level NTCPTermination Connection PointTETerminal EquipmentTITiming InformationSIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)11TSFTrail Signal FailTTTrail Termination functionTTsTrail Termination supervisory functionTTPTrail Termination PointTUTributary UnitTU-mTributary Unit, level mTUGTributary Unit GroupTUG-mTributary Unit Group, level mUNEQUnequippedVCVirtual ContainerVC-nVirtual Container, level n4Network and terminal interfaces for Virtual Container(VC) leased line connection4.1Section layer functions for Network Termination (NT) andTerminal Equipment (TE)4.1.1STM-1 section layers functions for NT and TEThe relevant section layer functions of electrical and optical STM-1 interfaces for NT and TE are shown in Figure 2 andFigure 3 respectively. The details of the atomic functions shown in these figures are given in clauses 5 and 6 of thepresent document. Two types of optical interfaces are relevant for leased line connections. These are the intra officeinterface (I1) and the short haul interface at 1 300 nm (S1.1).SIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)12RS1RS1/MS1RS1RS1/MS1RS1_CIRS1_CIRS1_AIRS1_AIES1ES1ES1/RS1ES1/RS1ES1_CRS1_CES1_CIES1_CIES1_AIES1_AIMS1MS1/S4MS1MS1/S4MS1_CIMS1_CIMS1/SDMS1/SDSD_CISD_CIS1[5-8]S1[5-8]RI_RDIRI_REIMS1_CSTM1_TIMS1-LCFigure 2: Section layers of a STM-1 electrical interface for NT and TESIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)13RS1RS1/MS1RS1RS1/MS1RS1_CIRS1_CIRS1_AIRS1_AIOS1OS1OS1/RS1OS1/RS1OS1_CRS1_COS1_CIOS1_CIOS1_AIOS1_AIMS1MS1/S4MS1MS1/S4MS1_CIMS1_CIMS1/SDMS1/SDSD_CISD_CIS1[5-8]S1[5-8]RI_RDIRI_REIMS1_CSTM1_TIMS1-LCFigure 3: Section layers of an optical STM-1 interface for NT and TESIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)144.1.2STM-4 section layers functions for NT and TEThe relevant section layer functions of optical STM-4 interfaces for NT and TE are shown in Figure 4. The details of theatomic functions shown in these figures are given in clauses 5 and 6 of the present document. Two types of opticalinterfaces are relevant for leased line connections. These are the intra office interface (I4) and the short haul interface at1 300 nm (S4.1).RS4RS4/MS4RS4RS4/MS4RS4_CIRS4_CIRS4_AIRS4_AIOS4OS4OS4/RS4OS4/RS4OS4_CRS4_COS4_CIOS4_CIOS4_AIOS4_AIMS4MS4S4_CIMS4_CIMS4_CIMS4/SDMS4/SDSD_CISD_CIS1[5-8]S1[5-8]RI_RDIRI_REIMS4_CMS4/S4STM4_TI14MS4-LCSD_CIS4_CIMS4/S414Figure 4: Section layers of an STM-4 interface for NT and TESIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)154.2Path layer functions for NT4.2.1Network path layer functions for VC-4 leased line connectionsThere are no requirements on the VC-4 path layer functions for VC-4 leased line connections under the presentdocument.NOTE:The connection characteristics of the VC-4 path layer are specified in the companion standardEN 301 164 [5].4.2.2Network path layer functions for lower order VC leased lineconnectionsThe relevant VC-4 path layer functions of an NT are shown in Figure 5. Their details are specified in clause 7 of thepresent document.The time taken for appearance of remote indication of defects and block errors depends on the processing time of theequipment terminating the VC-4 and the round trip delay between that equipment and the leased line interface.Therefore the timing criteria for setting and clearing of VC-4-RDI and VC-4-REI as given in the equipmentspecification EN 300 417-4-1 [11] cannot be directly applied to the present document.There are no requirements on the lower order VC path layer functions for lower order VC leased line connections underthe present document.NOTE:The connection characteristics of the lower order VC path layers are specified in the companion standardEN 301 164 [5].S4RI_RDIRI_REIS4/SXS4_AIS2_CIS12_CIS3_CIS4/SXS2_CIS12_CIS3_CIS4_CS4_CIS4_CIS4_AIS4S4-LCSD_CIS4_TIFigure 5: NT path layer for lower order VC connectionsSIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)164.3Path layers functions for TE4.3.1Terminal path layer functions for VC-4 leased line connectionsThe relevant VC-4 path layer functions of a TE are shown in Figure 6. Their details are specified in clause 7 of thepresent document. There are no requirements on the adaptation functions with two exceptions:- they shall be timed by the S4-TI signal;- VC-4 payload signals the mapping of which is not defined in ETS 300 147 [6] shall be scrambled whenemulation of the STM-N scrambler polynomial 1 + x6 + x7 in more than 8 consecutive bytes of the VC-4 payloadcould occur. Scrambling is not necessary when the client layer take actions to exclude the emulation of thescrambler polynomial in more than 8 consecutive bytes of the VC-4 payload.NOTE:Scrambling provides security against malicious emulation of the SDH set-reset scrambler pattern. Withoutscrambling a specific pattern could generate a long sequence of binary "0" which may be detected as LossOf Signal (LOS) or replicate the STM-N frame alignment word.S4_CIS4RI_RDI, RI_REIS4/clientS4_AIS4_CS4_TIS4-LCSD_CIS4S4_AIS4/clientFigure 6: Terminal equipment path layer for VC-4 leased line connections4.3.2Terminal path layer functions for lower order VC leased lineconnectionsThe relevant path layer functions of a TE are shown in Figure 7. Their details are specified in clause 7 of the presentdocument. There are no requirements on the adaptation functions from the lower order path layers to theirs client layersexcept that they shall be timed by the associate Sm-TI signal (m = 12, 2, 3).The path layers may not be terminated at the equipment providing the physical interface. They may also be originated atdifferent equipment. The appearance time of remote indication of defects and block errors depends the processing timeof the equipment terminating the VC path layer and the round trip delay between that equipment and the leased lineinterface. Therefore the timing criteria for setting and clearing of VC-RDI and VC-REI as given in the equipmentspecification EN 300 417-4-1 [11] cannot be directly applied to the present document.SIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)17S4RI_RDIRI_REIS4_AIS4_CS4_CIS4_CIS4_AIS4S4/SXS4/SXS2_CIS3_CIS2S2_AIS3S3_AIS2_CIS12_CIS3_CIS12S12_AIS2S2_AIS3S3_AIS4-LCSD_CIS4_TIS12/ClientS2/ClientS3/ClientS3/ClientS2/ClientS12-LCSD_CIS2-LCSD_CIS12_CIS12S12_AIS12/ClientRI_RDI, RI_REIRI_RDI, RI_REIRI_RDIRI_REIS3-LCSD_CIFigure 7: Terminal equipment path layers for lower order VC leased line connections4.4Mechanical characteristics for NT and TE interfaces4.4.1Connectors for the electrical STM-1 interfaceNetwork and terminal interface shall be provided, using two coaxial 75 W sockets, one each for transmit and receive.These sockets being either:a) 75 W sockets (type 1.6/5.6) complying with IEC 60169-13 [3]; orb) 75 W BNC sockets complying with the general requirements of IEC 60169-8 [2] with the mating dimensionsspecified in annex B of ISO/IEC 10173 [4].The outer conductor of the coaxial pair shall be connected to signal ground both at the input and at the output port.NOTE:When connecting the terminal equipment to the Network Termination Point (NTP), any difference inground potential between the two equipment may produce a voltage across the signal ground connectionand may cause damage. See IEC 60364-5-548 [15] for details of earthing requirements within customers'premises.4.4.2Connectors for optical STM-N interfacesNetwork and terminal interface shall be provided, using two optical sockets, one each for transmit and receive. Thesesockets are not specified in the present document.SIST EN 301 165 V1.1.1:2003



ETSIEN 301 165 V1.1.1 (1999-05)184.5SafetyThe network and the terminal interface shall comply with the requirements for accessible parts of an Safety Extra LowVoltage (SELV) circuit. The test shall be conducted according to EN 60950 [1].NOTE:The test associated with this requirement is not suitable for use on installed leased lines. Such tests may beapplied to equipment of the kind used to provide the interface.4.6AU/TU numbering schemeThe numbering of AU-4s (VC-4s) in an STM-N and of TU-12s (VC-12s), TU-2s (VC-2s) and TU-3s (VC-3s) in a VC-4is specified in subclause 3.3.3 of EN 300 417-1-1 [8].5Application of EN 300 417-2-1The requirements of EN 300 417-2-1 [9] shall be applied except as indicated in tables 1 and 2, where N = Normative,I = Informative, and N
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