ETSI ETS 300 299 ed.2 (1997-06)

Broadband Integrated Services Digital Network (B-ISDN); Cell based user network access for 155 520 kbit/s and 622 080 kbit/s; Physical layer interfaces for B-ISDN applications

RE/TM-03030

Širokopasovno digitalno omrežje z integriranimi storitvami (B-ISDN) – Omrežni dostop za celičnega uporabnika za hitrosti 155 520 kbit/s in 622 080 kbit/s – Vmesniki fizične plasti za aplikacije sistema B-ISDN

General Information

• Status: Published
• Publication Date: 05-Jun-1997
• Technical Committee: TM 3 - Interfaces, architecture and functional requirements of transport netw
• Current Stage: 12 - Completion
• Due Date: 23-May-1997
• Completion Date: 06-Jun-1997
• Ref Project: SIST ETS 300 299 E2:2003 - Broadband Integrated Services Digital Network (B-ISDN); Cell based user network access for 155 520 kbit/s and 622 080 kbit/s; Physical layer interfaces for B-ISDN applications

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Broadband Integrated Services Digital Network (B-ISDN); Cell based user network access for 155 520 kbit/s and 622 080 kbit/s; Physical layer interfaces for B-ISDN applications33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:ETS 300 299 Edition 2SIST ETS 300 299 E2:2003en01-december-2003SIST ETS 300 299 E2:2003SLOVENSKI
STANDARD
EUROPEANETS 300 299TELECOMMUNICATIONJune 1997STANDARDSecond EditionSource: ETSI TC-TMReference: RE/TM-03030ICS:33.020Key words:B-ISDN, ISDN, UNI, ATM, interface, access, transmissionBroadband Integrated Services Digital Network (B-ISDN);Cell based user network accessfor 155 520 kbit/s and 622 080 kbit/s;Physical layer interfaces for B-ISDN applicationsETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail].: [phone] - Fax: [phone]Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1997. All rights reserved.SIST ETS 300 299 E2:2003

Page 2ETS 300 299: June 1997Whilst every care has been taken in the preparation and publication of this document, errors in content,typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to"ETSI Editing and Committee Support Dept." at the address shown on the title page.SIST ETS 300 299 E2:2003

Page 3ETS 300 299: June 1997ContentsForeword.71Scope.92Normative references.93Definitions and abbreviations.103.1Definitions.103.2Abbreviations.104Reference configuration at the user-network interface.114.1Functional groups and reference points.114.2Examples of physical realizations.124.3Basic characteristics of the interfaces at TB and SB reference points.164.3.1Characteristics of the interfaces at 155 520 kbit/s.164.3.1.1Interface at the TB reference point.164.3.1.2Interface at the SB reference point.164.3.1.3Relationship between interfaces at SB and TB.164.3.2Characteristics of the interfaces at 622 080 kbit/s.164.3.2.1Interface at TB reference point.164.4Relationship between ISDN interfaces.164.5Functional groups characteristics.164.5.1Network termination 1 for B-ISDN.164.5.2Network termination 2 for B-ISDN (B-NT2).174.5.3Terminal equipment for B-ISDN (B-TE).174.5.3.1Terminal equipment type 1 for B-ISDN (B-TE1).174.5.3.2Terminal equipment type 2 for B-ISDN (B-TE2).174.5.4Terminal adapter for B-ISDN (B-TA).175User network interface specifications.185.1Interface location with respect to reference configuration.185.2Interface location with respect to the wiring configuration.186Service and layering aspects of the physical layer.186.1Services provided to the ATM-layer.186.2Service primitives exchanged with the ATM layer.186.3Sublayering of the physical layer.197Physical medium characteristics of the UNI at 155 520 kbit/s.197.1Characteristics of the interface at the TB and SB reference points.197.1.1Bit rate and interface symmetry.197.1.2Physical characteristics.197.1.2.1Electrical interface.197.1.2.1.1Interface range.197.1.2.1.2Transmission medium.197.1.2.1.3Electrical parameters at interfacepoints Ia and Ib.197.1.2.1.4Electrical connectors.197.1.2.1.5Line coding.207.1.2.1.6ElectromagneticCompatibility/Interference (EMC/EMI)requirements.207.1.2.2Optical interface.217.1.2.2.1Attenuation range.217.1.2.2.2Transmission medium.217.1.2.2.3Optical parameters.227.1.2.2.3.1Line coding.22SIST ETS 300 299 E2:2003

Page 4ETS 300 299: June 19977.1.2.2.3.2Operating wavelength.227.1.2.2.3.3Input and output port characteristics.227.1.2.2.4Optical connectors.227.1.2.2.5Safety requirements.227.1.2.3Jitter and wander.228Physical medium characteristics of the UNI at 622 080 kbit/s.238.1Characteristics of the interface at the TB and SB reference points.238.1.1Bit rate and interface symmetry.238.1.2Physical characteristics.238.1.2.1Attenuation range.238.1.2.2Transmission medium.238.1.2.3Optical parameters.238.1.2.3.1Line coding.238.1.2.3.2Operating wavelength.238.1.2.3.3Input and output port characteristics.238.1.2.4Optical connectors.248.1.2.5Safety requirements.248.1.2.6Jitter and wander.249Power feeding.249.1Provision of power.249.2Power available at B-NT1.249.3Feeding voltage.249.4Safety requirements.2510Functions provided by the transmission convergence sublayer.2510.1Transfer capability.2510.1.1Interface at 155 520 kbit/s.2510.1.2Interface at 622 080 kbit/s.2510.2Physical layer aspects.2510.2.1Timing.2510.2.2Interface structure for 155 520 kbit/s and 622 080 kbit/s.2510.3Header Error Control (HEC).2610.3.1HEC functions.2610.3.2HEC sequence generation.2810.4Idle cells.2810.5Cell delineation and scrambling.2910.5.1Cell delineation and scrambling objectives.2910.5.1.1Cell delineation algorithm.2910.5.2Cell delineation performance.3010.5.3Scrambler operation.3010.5.3.1Distributed sample scrambler (31st order).3010.5.3.2Transmitter operation.3010.5.3.3Receiver operation.3110.5.3.4State transition diagram and mechanism.3211UNI related OAM functions.3311.1Transmission overhead allocation.3311.2OAM cell identification.3411.3Allocation of OAM functions in information field.3411.4Maintenance signals.3811.5Transmission performance monitoring.3811.6Control communication.3812Operational functions.3812.1Description of signals at the interface.3812.1.1Signals defined in ITU-T Recommendation I.610.3812.1.2Cell delineation signals.39SIST ETS 300 299 E2:2003

Page 5ETS 300 299: June 199712.2Definitions of state tables at network and user sides.3912.2.1Layer 1 states on the user side of the interface.4012.2.2Layer 1 states at the network side of the interface.4112.2.3Definition of primitives.4212.2.4State tables.43Annex A (informative):Impact of random bit errors on cell delineation performance.46Annex B (informative):Distributed sample scrambler descrambler implementation example.47History.49SIST ETS 300 299 E2:2003

Page 6ETS 300 299: June 1997Blank pageSIST ETS 300 299 E2:2003

Page 7ETS 300 299: June 1997ForewordThis second edition European Telecommunication Standard (ETS) has been produced by theTransmission and Multiplexing (TM) Technical Committee of the European TelecommunicationsStandards Institute (ETSI).This ETS defines the cell based user network access physical layer interfaces to be applied to the TB, SBreference points of the reference configurations of the Broadband Integrated Services Digital Network(B-ISDN) User-Network Interface (UNI) at 155 520 kbit/s and 622 080 kbit/s, for B-ISDN applications. Itaddresses separately the Physical Media Dependant (PMD) and Transmission Convergence (TC)sublayers used at these interfaces and addresses also the implementation of UNI related physical layerOperations And Maintenance (OAM) functions.This ETS takes into account the recommendations given in ITU-T Recommendations I.413 [7], I.432.1and I.432.2 [8].Transposition datesDate of adoption:2 May 1997Date of latest announcement of this ETS (doa):30 September 1997Date of latest publication of new National Standardor endorsement of this ETS (dop/e):31 March 1998Date of withdrawal of any conflicting National Standard (dow):31 March 1998SIST ETS 300 299 E2:2003

Page 8ETS 300 299: June 1997Blank pageSIST ETS 300 299 E2:2003

Page 9ETS 300 299: June 19971ScopeThis second edition European Telecommunication Standard (ETS) defines the physical layer interface tobe applied to the SB and TB reference points of the reference configurations of the Broadband IntegratedServices Digital Network (B-ISDN) cell based User-Network Interface (UNI) at 155 520 kbit/s and622 080 kbit/s. It addresses separately the Physical Media Dependant (PMD) and TransmissionConvergence (TC) sublayers used at these interfaces, and address also the implementation of UNIrelated physical layer OAM functions.The selection of the physical medium for the interfaces at the SB and TB reference points should take intoaccount that optical fibre is agreed as the preferred medium to be used to cable customer equipment.However, in order to allow the use of existing cabling of customer equipment, other transmission media(e.g. twisted pairs and coaxial cables) should not be precluded. Also, implementations should allowterminal interchangeability.This ETS reflects in its structure and content the desire to take care of such early configurations andintroduces a degree of freedom when choosing a physical medium at the physical layer.2Normative referencesThis ETS incorporates by dated and undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this ETS only when incorporated in it by amendment or revision. For undated references the latestedition of the publication referred to applies.[1]ITU-T Recommendation G.652: "Characteristics of a single-mode optical fibrecable".[2]ETS 300 166: "Transmission and Multiplexing (TM); Physical and electricalcharacteristics of hierarchical digital interfaces for equipment using the2048 kbit/s - based plesiochronous or synchronous digital hierarchies".[3]ETS 300 232: "Transmission and Multiplexing (TM); Optical interfaces forequipments and systems relating to the Synchronous Digital Hierarchy [ITU-TRecommendation G.957 (1993) modified]".[4]ITU-T Recommendation I.113: "Vocabulary of terms for broadband aspects ofISDN".[5]ITU-T Recommendation I.321: "B-ISDN protocol reference model and itsapplication".[6]ITU-T Recommendation I.361 (1995): "B-ISDN ATM layer specification".[7]ITU-T Recommendation I.413 (1993): "B-ISDN user-network interface".[8]ITU-T Recommendation I.432.1 (1996): "B-ISDN user network interface -Physical layer specification for 155 520 kbit/s and 622 680 kbit/s - Generalcharacteristics".ITU-T Recommendation I.432.2 (1996): "B-ISDN user network interface -Physical layer specification for 155 520 kbit/s and 622 680 kbit/s".[9]ITU-T Recommendation I.610 (1995): "B-ISDN operation and maintenanceprinciples and functions".[10]ITU-T Recommendation X.200: "Information technology - Open SystemsInterconnection - Basic reference model: The basic model".[11]I-ETS 300 404: "Broadband Integrated Services Digital Network (B-ISDN);B-ISDN Operation And Maintenance (OAM) principles and functions".SIST ETS 300 299 E2:2003

Page 10ETS 300 299: June 1997[12]IEC Publication 825-1: "Safety of laser products: Part 1: Equipment classificationrequirements and user's guide".[13]IEC Publication 950: "Safety of information technology equipment, includingelectrical business equipment".[14]ITU-T Recommendation G.825: "The control of jitter and wander within digitalnetworks which are based on the synchronous digital hierarchy (SDH)".[15]ITU-T Recommendation G.958: "Digital line systems based on the synchronousdigital hierarchy for use on optical fibre cables".[16]ITU-T Recommendation G.826: "Error performance parameters and objectivesfor international, constant bit rate digital paths at or above the primary rate".3Definitions and abbreviations3.1DefinitionsFor the purposes of this ETS, the definitions given in ITU-T Recommendation I.113 [4] apply, in particularfor the definitions of idle cell, valid cell and invalid cell. In addition, the following definition applies:to be defined: These items or values are not yet specified.3.2AbbreviationsFor the purposes of this ETS, the following abbreviations apply:AISAlarm Indication SignalATMAsynchronous Transfer ModeBERBit Error RatioB-ISDNBroadband Integrated Services Digital NetworkB-NTB-ISDN Network TerminationB-TAB-ISDN Terminal AdaptorB-TEB-ISDN Terminal EquipmentBIPBit Interleaved ParityB-UNIBroadband UNICATVCAble TeleVisionCECCell Error ControlCLPCell Loss PriorityCMICoded Mark InversionCRCCyclic Redundancy CheckDSSDistributed Sample ScramblerEDCError Detection CodeEMCElectromagnetic CompatibilityEMIElectroMagnetic InterferenceHECHeader Error ControlISDNIntegrated Services Digital NetworkLANLocal Area NetworkLCDLoss of Cell DelineationLOMLoss Of Maintenance cellLOSLoss Of SignalLSBLeast Significant BitNMBNumber of Monitored BlocksNNINetwork Node InterfaceMAMedium AdaptorMBSMonitoring Block SizeMPHManagement Physical HeaderMSBMost Significant BitNICNumber of Included CellsNRZNon Return to ZeroOAMOperation And MaintenanceSIST ETS 300 299 E2:2003

Page 11ETS 300 299: June 1997OCDOut of Cell DelineationOSIOpen Systems InterconnectionP-AISPath Alarm Indication SignalPHPhysical HeaderPMPhysical Mediumppmparts per millionPRBSPseudo-Random Binary SequenceP-REIPath Remote Error IndicationPSNPhysical layer Sequence NumberRDIRemode Defect IndicationSDHSynchronous Digital HierarchySTISurface Transfer ImpedanceTCTransmission ConvergenceTFVTerminal Failure VoltageUNAUser-Network AccessUNIUser-Network InterfaceVCIVirtual Channel IdentifierVPIVirtual Path Identifier4Reference configuration at the user-network interface4.1Functional groups and reference pointsThe reference configurations defined for Integrated Services Digital Network (ISDN) basic access andprimary access are considered general enough to be applicable to all aspects of the B-ISDN accesses.Figure 1 shows the B-ISDN reference configurations which contain the following:-functional groups: B-NT1, B-NT2, B-TE1, TE2, B-TE2, and B-TA;-reference points: TB, SB and R.B-TE1B-NT1B-TAReference pointSBRSBFunctional groupB-TA
Broadband Terminal AdaptorB-TE
Broadband Terminal EquipmentB-NT
Broadband Network TerminationB-NT2TBTE2orB-TE2Figure 1: B-ISDN reference configurationsIn order to clearly illustrate the broadband aspects, the notations for reference points and for functionalgroups with broadband capabilities are appended with the letter B (e.g. B-NT1, TB). The broadbandfunctional groups are equivalent to the functional groups defined in ISDN. Interfaces at the R referencepoint may or may not have broadband capabilities.Interfaces at reference points SB and TB will be standardized. These interfaces will support all ISDNservices.SIST ETS 300 299 E2:2003

Page 12ETS 300 299: June 19974.2Examples of physical realizationsFigure 2 gives examples of physical configurations illustrating combinations of physical interfaces atvarious reference points. The examples cover configurations that could be supported by standardizedinterfaces at reference points SB and TB. Other configurations may also exist. For example, physicalconfigurations of B-NT2 may be distributed, or use shared medium, to support Local Area Network (LAN)emulation and other applications.Figure 3 illustrates possible physical configurations, but does not preclude alternative configurations.Whether a single interface at the SB reference point can cover different configurations, as illustrated infigure 3, is for further study.Figure 2 is subdivided into separate items as follows:-figures 2a) and 2b) show separate interfaces at the SB and TB reference points;-figures 2c) and 2d) show an interface at SB but not at TB;-figures 2e) and 2f) show an interface at TB but not at SB;-figures 2g) and 2h) show separate interfaces at S, SB and TB;-figures 2i) and 2j) show interfaces at SB and TB which are coincident.Additionally, figures 2b), 2d), 2f), 2h) and 2j) show an interface at reference point R.SIST ETS 300 299 E2:2003

Page 13ETS 300 299: June 1997B-NT2TSB-NT1BBa)B-TE1B-NT2TSB-NT1BBB-TARb) TE2
orB-TE2 Configurations where B-ISDN physical interfaces occur at reference points SB and TBSBc)B-NT1B-NT2+B-TE1SBB-TARd)B-NT1B-NT2+TE2
orB-TE2 NoteConfigurations where B-ISDN physical interfaces occur at reference point SB onlyB-NT2B-NT1+e)B-TETBTB-NT1BB-TARB-NT2+f)TE2
orB-TE2 Configurations where B-ISDN physical interfaces occur at reference point TB onlyB-NT2TSB-NT1BSBRh)TATE2B-TE1B-NT2TSB-NT1BTE1g)B-TE1SBConfigurations where B-ISDN and ISDN physical interfaces occur at reference points S, SB and TBB-NT1RB-TAj)TE2
orB-TE2 S
and T
coincidentBBB-NT1B-TE1i)S
and T
coincidentBBConfigurations where a single B-ISDN physical interface occurs at a location where both referencepoints SB and TB coincideEquipment implementingfunctional groupsPhysical interface at thedesignated reference pointNOTE:The needed for an access to a TB reference point between B-NT1 and B-NT2 is for furtherstudy.Figure 2: Examples of physical configurations for broadband user applicationsSIST ETS 300 299 E2:2003

Page 14ETS 300 299: June 1997a) centralized B-NT2 configuration:B - TE1B - TE1B - TE1B - NT2B - NT1TBSBSBSBb) distributed B-NT2 configurations:b1)generic configurationWWMAMAWMA(note 1)SBSBRTE2orB - TE2B - TAB - NT1B - NT2MAB - TARTE2orB - TE2B - TE1TB(note 2)b2)physical configurations(note 1)MAB - TE1B - NT1WWTBTBMAMAB - TE1SBSBB - NT1B - TE1SBWWWWB - TE1B - TE1MAMAMAMASBSB(note 1) Figure 3 (continued): Examples of physical configurations for multipoint applicationsSIST ETS 300 299 E2:2003

Page 15ETS 300 299: June 1997c) multi-access B-TE configurations:c1)generic configurations (note 7)TBB - NT1B - NT2SBB - TE*B - TE*B - TE*SSBSSB(note 3)c2)physical configurations(note 5)(note 4)(note 6)B - NT2B - NT1SSBSSBSBTBB - TE*B - TE*B - TE*SBB - NT2B - NT1SSBSSBSBTBB - TE*B - TE*B - TE*(note 5)(note 4)SSBSSBSSBSSBSSBSSBSBSBSBB - NT2B - NT1TBB - TE*B - TE*B - TE*B - TE*B - TE*B - TE*B - TE*B - TE*B - TE*NOTE 1:Medium Adaptor (MA): accommodates the specific topology of the distributed B-NT2. Theinterface at W may include topology dependant elements and may be a non-standardizedinterface.NOTE 2:There will be a physical link between these two MAs in the case of ring configurations.NOTE 3:There will be a physical link between B-TE* and B-NT2 in the case of ring configurations.NOTE 4:The B-TE* includes shared medium access functions.NOTE 5:The measurable physical characteristics of the SSB interface are identical to those of the SBinterface. The functional characteristics of the interface, however, may be a superset of thoseat the SB interface.NOTE 6:The B-NT2 may be null in the case of commonality between SB and TB.NOTE 7:Additional termination functions (e.g. for loopback in bus configuration) and OAM functions maybe necessary for multi-access B-TE configurations. Requirements and implementations ofthese functions are for further study.Figure 3 (concluded): Examples of physical configurations for multipoint applicationsSIST ETS 300 299 E2:2003

Page 16ETS 300 299: June 19974.3Basic characteristics of the interfaces at TB and SB reference points4.3.1Characteristics of the interfaces at 155 520 kbit/s4.3.1.1Interface at the TB reference pointThere is only one interface per B-NT1 at the TB reference point. The operation of the physical medium ispoint-to-point in the sense that there is only one sink (receiver) in front of one source (transmitter).Point-to-multipoint configurations at TB at Asynchronous Transfer Mode (ATM) and higher layers are forfurther study.4.3.1.2Interface at the SB reference pointOne or more SB interfaces per B-NT2 are present. The interface at the SB reference point is point-to-pointat the physical layer in the sense that there is only one sink (receiver) in front of one source (transmitter)and may be point to multipoint at the other layers.4.3.1.3Relationship between interfaces at SB and TBConfigurations described in figures 2i) and 2j) require that the interface specifications at TB and SB shouldhave a high degree of commonality, in order to ensure that a simple broadband terminal may beconnected directly to the TB interface.The feasibility of achieving the needed commonality is for further study.4.3.2Characteristics of the interfaces at 622 080 kbit/s4.3.2.1Interface at TB reference pointThere is only one interface per B-NT1 at the TB reference point. The operation of the physical medium ispoint-to-point in the sense that there is only one sink (receiver) in front of one source (transmitter).Point-to-multipoint configurations at TB at ATM and higher layers are for further study.4.4Relationship between ISDN interfacesFigures 2g) and 2h) show configurations where B-ISDN and ISDN interfaces may occur at SB and Srespectively. In this case, B-NT2 functionalities have to ensure the interface capabilities for both S and SB.Other configurations for supporting terminals at the interface at the S reference point may exist.4.5Functional groups characteristicsLists of functions for each functional group are given below. Each particular function is not necessarilyrestricted to a single functional group. For example, "interface termination" functions are included in thefunction lists of B-NT1, B-NT2 and B-TE. The function lists for B-NT1, B-NT2, B-TE and B-TA are notexhaustive. Not all specific functions in a functional group need to be present in all implementations.4.5.1Network termination 1 for B-ISDNThis functional group includes functions broadly equivalent to layer 1 of the Open System Interconnection(OSI) reference model. Examples of B-NT1 functions are:-line transmission termination;-transmission interface handling;-cell delineation;-OAM functions.SIST ETS 300 299 E2:2003

Page 17ETS 300 299: June 19974.5.2Network termination 2 for B-ISDN (B-NT2)This functional group includes functions broadly equivalent to layer 1 and higher layers of theITU-T Recommendation X.200 [10] reference model. B-NT2 can be null in the case of commonalitybetween TB and SB.Examples of B-NT2 functions are:-adaptation functions for different media and topologies (MA functions);-functions of a distributed B-NT2;-cell delineation;-concentration;-buffering;-multiplexing/demultiplexing;-resource allocation;-usage parameter control;-adaptation layer functions for signalling (for internal traffic);-interface handling (for the TB and SB interfaces);-OAM functions;-signalling protocol handling;-switching of internal connections.B-NT2 implementations may be concentrated or distributed. In a specific access arrangement, the B-NT2may consist only of physical connections. When present, implementations of the B-NT2 are locallypowered.4.5.3Terminal equipment for B-ISDN (B-TE)This functional group includes functions broadly belonging to layer 1 and higher layers of theITU-T Recommendation X.200 [10] reference model.Examples of B-TE functions are:-user/user and user/machine dialogue and protocol;-interface termination and other layer 1 functions;-protocol handling for signalling;-connection handling to other equipments;-OAM functions.The possibility of powering the B-TE via the SB interface is for further study.4.5.3.1Terminal equipment type 1 for B-ISDN (B-TE1)This functional group includes functions belonging to the B-TE functional group with an interface thatcomplies with the B-ISDN SB and/or TB interface ETSs.4.5.3.2Terminal equipment type 2 for B-ISDN (B-TE2)This functional group includes functions belonging to the functional group B-TE but with a broadbandinterface that complies with interface recommendations other than the B-ISDN interface recommendationsor interfaces not included in ITU-T Recommendations.4.5.4Terminal adapter for B-ISDN (B-TA)This functional group includes functions broadly belonging to layer 1 and higher layers of theITU-T Recommendation X.200 [10] reference model that allow a TE2 or a B-TE2 terminal to be served bya B-ISDN user-network interface.SIST ETS 300 299 E2:2003

Page 18ETS 300 299: June 19975User network interface specifications5.1Interface location with respect to reference configurationAn interface point Ia is adjacent to the B-TE or the B-NT2 on their network side; interface point Ib isadjacent to the B-NT2 and to the B-NT1 on their user side (see figure 4).B-TEB-NT2B-NT1BSTBIabIIabIFigure 4: Reference configuration at reference points SB and TB5.2Interface location with respect to the wiring configurationThe interface points are located between the socket and the plug of the connector attached to the B-TE,B-NT2 or B-NT1. The location of the interface point is shown in figure 5.In this ETS, the term "B-NT" is used to indicate network terminating layer 1 aspects of B-NT1 and B-NT2functional groups, and the term "TE" is used to indicate terminal terminating layer 1 aspects of B-TE1,B-TA and B-NT2 functional groups, unless otherwise indicated.connecting cordWiring at thecustomer premisesB - TEB - NTIabI(note)NOTE:The length of the connecting cord can be zero.Figure 5: Wiring configuration6Service and layering aspects of the physical layer6.1Services provided to the ATM-layerThe physical layer provides for the transparent transmission of ATM-PDUs between Physical layer ServiceAccess Points (Ph-SAP). The ATM-PDU is called ATM cell. The ATM cell is defined inITU-T Recommendation I.361 [6]. As no addressing is implemented in the physical layer only a singlePh-SAP can exist at the boundary between physical layer and ATM layer. The interarrival time betweencells passed to the ATM layer is not defined (asynchronous transmission). The physical layer provides theATM layer with timing information.6.2Service primitives exchanged with the ATM layerThe service primitives between physical layer and ATM layer are defined inITU-T Recommendation I.361 [6], section 3.2.SIST ETS 300 299 E2:2003

Page 19ETS 300 299: June 19976.3Sublayering of the physical layerThe physical layer is subdivided into two sublayers:-the Physical Medium (PM) sublayer;-the Transmission Convergence (TC) sublayer.No service access point and service primitives are defined between the PM and the TC sublayers. Thefunctions of the individual sublayer are defined in ITU-T Recommendation I.321 [5].7Physical medium characteristics of the UNI at 155 520 kbit/s7.1Characteristics of the interface at the TB and SB reference points7.1.1Bit rate and interface symmetryThe bit rate of the interface is 155 520 kbit/s. The interface is symmetric, i.e. it has the same bit rate inboth transmission directions.The nominal bit rate in free running clock mode shall be 155 520 kbit/s with a tolerance of ±20 ppm.7.1.2Physical characteristicsBoth optical and electrical interfaces are recommended. The implementation selected depends on thedistance to be covered and user requirements arising from the details of the installation.7.1.2.1Electrical interface7.1.2.1.1Interface rangeThe maximum range of the interface depends on the specific attenuation of the transmission mediumused. For example a maximum range of about 100 m for microcoax (4 mm diameter) and 200 m for CableTelevision (CATV) type (7 mm diameter) cables can be achieved.7.1.2.1.2Transmission mediumTwo coaxial cables, one for each direction, shall be used. The wiring configuration shall be point-to-point.The impedance shall be 75 W with a tolerance of ±5 % in the frequency range 50 MHz to 200 MHz.The attenuation of the electrical path between the interface points Ia and Ib shall be assumed to follow anapproximate
f
law and to have a maximum insertion loss of 20 dB at a frequency of 155 520 kHz.7.1.2.1.3Electrical parameters at interface points Ia and IbThe digital signal presented at the output port and the port impedance shall conform to ETS 300 166 [2]for the interface at 155 520 kbit/s.The digital signal presented at the input port and the port impedance shall conform to ETS 300 166 [2] forthe interface at 155 520 kbit/s, modified by the characteristics of the interconnecting coaxial pair.7.1.2.1.4Electrical connectorsThe presentation of interface point Ib at B-NT1 or B-NT2 shall be via a socket.The presentation of interface point Ia at B-TE or B-NT2 shall be using either:a)a socket, i.e. the connection shall be made to the equipment toward the network with a cable withplugs on both ends; orb)an integral connecting cord with plug on the free end.SIST ETS 300 299 E2:2003

Page 20ETS 300 299: June 19977.1.2.1.5Line codingThe line coding shall be Coded Mark Inversion (CMI), see ETS 300 166 [2].7.1.2.1.6Electromagnetic Compatibility/Interference (EMC/EMI) requirementsShielding properties of connectors and cables are defined by the specification of the respective values forthe Surface Transfer Impedance (STI). The template indicating the maximum STI values for CATV cablesis given in figure 6. For connectors, these template values shall be multiplied by 10 (20 dB).The immunity of the interface against induced noise on the transmission medium should be specified bymeans of a Terminal Failure Voltage (TFV) which is overlaid to the digital signal at the output port.Figure 7 shows a possible measurement configuration.The receiver should tolerate a sinusoidal TFV with the values defined in figure 8 and table 1 withoutdegradation of the Bit Error Ratio (BER) performance.Blog
STIAf012log frequencyff10frequency (MHz): STI value (WW/m): f0 = 0,1A = 0,01f1 = 100f2 = 1 000B = 1The applicability of these values for microcoax cables is for further study.Figure 6: Maximum STI values as a function of frequencyTransmitsignalgeneratorTransmissioncableReceiverundertestBERAnalyserTFVGenerator+Figure 7: Measurement configurationSIST ETS 300 299 E2:2003

Page 21ETS 300 299: June 1997TFVleveldBVF0frequency
(MHz)1F2FA1A2Figure 8: Terminal Failure Voltage (TFV) frequency responseTable 1: TFV valuesfrequency (MHz)TFV amplitude (dBV)(0 dBV = 1 Vop)F0 = 1F1 = 200A1 ³ -17F2 = 400A2 ³ -117.1.2.2Optical interface7.1.2.2.1Attenuation rangeThe attenuation of the optical path between the specification points S and R, as defined inETS 300 232 [3], shall be in the range of 0 dB to 7 dB (see subclause 7.1.2.2.3.3).7.1.2.2.2Transmission mediumThe transmission medium shall consist of two single mode fibres according toITU-T Recommendation G.652 [1], one for each direction.SIST ETS 300 299 E2:2003

Page 22ETS 300 299: June 19977.1.2.2.3Optical parameters7.1.2.2.3.1Line codingThe line coding shall be binary Non Return to Zero (NRZ).The convention used for optical logic level is:-emission of light for a binary ONE;-no emission of light for a binary ZERO.The extinction ratio shall be in accordance with ETS 300 232 [3], application code I-1.7.1.2.2.3.2Operating wavelengthThe operating wavelength shall be around 1 310 nm (second window) and in accordance withETS 300 232 [3], application code I-1.7.1.2.2.3.3Input and output port characteristicsThe optical parameters shall be in accordance with ETS 300 232 [3], application code I-1. Some nationalapplication may use optical parameters for multi-mode fibres.The specification points associated with interface points Ia and Ib correspond to measurement "referencepoints" S and R as defined in ETS 300 232 [3]. The optical parameters are specified for the transmitterand receiver at these specification points and for the optical path between these specification points, i.e.the connector at the interface is considered to be part of the equipment and not part of the fibreinstallation.7.1.2.2.4Optical connectorsThe presentation of interface point Ib at B-NT1 or B-NT2 shall be via a socket.The presentation of interface point Ia at B-TE or B-NT2 shall be using either:a)a socket, i.e. the connection shall be made to the equipment toward the network with a cable withplugs on both ends; orb)an integral connecting cord with plug on the free end.7.1.2.2.5Safety requirementsFor safety reasons, the parameters for IEC Publication 825-1 [12], Class 1 devices shall not be exceeded,even under failure conditions.7.1.2.3Jitter and wanderFor both electrical and optical Broadband UNI (B-UNI), the interface output jitter shall be in accordancewith the appropriate limit given in ITU-T Recommendation G.825 [14] for the electrical and opticalinterface.Equipments having an electrical or optical B-UNI (e.g. B-NT1, B-NT2, B-TE) and which meet the outputjitter tolerance and the jitter transfer specifications given in ITU-T Recommendations G.825 [14] andG.958 [15] respectively, are assured of proper operation when the interface output jitter conforms to thelimits in ITU-T Recommendation G.825 [14].SIST ETS 300 299 E2:2003

Page 23ETS 300 299: June 19978Physical medium characteristics of the UNI at 622 080 kbit/s8.1Characteristics of the interface at the TB and SB reference points8.1.1Bit rate and interface symmetryThe bit rate of the interface in at least one direction shall be 622 080 kbit/s. The following possibleinterfaces have been identified:a)an asymmetrical interface with 622 080 kbit/s in one direction and 155 520 kbit/s in the otherdirection;b)a symmetrical interface with 622 080 kbit/s in both directions.If option a) is chosen, then the 155 520 kbit/s component should comply with the characteristics as givenin clause 7.The nominal bit rate in free running clock mode shall be 622 080 kbit/s with a tolerance of ±20 ppm.8.1.2Physical characteristicsFor the purposes of this ETS, only the optical interface is considered.8.1.2.1Attenuation rangeThe attenuation of the optical path between the specification points S and R shall be in the range of 0 dBto 7 dB (see subclause 7.1.2.2.3.3).8.1.2.2Transmission mediumThe transmission medium shall consist of two single mode fibres according toITU-T Recommendation G.652 [1], one for each direction.8.1.2.3Optical parameters8.1.2.3.1Line codingThe line coding shall be binary Non Return to Zero (NRZ).The convention used for optical logic level is:-emission of light for a binary ONE;-no emission of light for a binary ZERO.The extinction ratio shall be in accordance with ETS 300 232 [3], application code I-4.8.1.2.3.2Operating wavelengthThe operating wavelength shall be around 1 310 nm (second window) and in accordance withETS 300 232 [3], application code I-4.8.1.2.3.3Input and output port characteristicsThe optical parameters shall be in accordance with ETS 300 232 [3], application code I-4.The specification points associated with interface points Ia and Ib correspond to measurement referencepoints S and R as defined in ETS 300 232 [3]. The optical parameters are specified for the transmitter andreceiver at these specification points and for the optical path between these specification points, i.e. theconnector at the interface is considered to be part of the equipment and not part of the fibre installation.SIST ETS 300 299 E2:2003

Page 24ETS 300 299: June 19978.1.2.4Optical connectorsThe presentation of interface point Ib at B-NT1 or B-NT2 shall be via a socket.The presentation of interface point Ia at B-TE or B-NT2 shall be using either:a)a socket, i.e. the connection shall be made to the equipment toward the network with a cable withplugs on both ends; orb)an integral connecting cord with plug on the free end.8.1.2.5Safety requirementsFor safety reasons, the parameters for IEC Publication 825-1 [12], Class 1 devices shall not be exceededeven under failure conditions.8.1.2.6Jitter and wanderFor both electrical and optical B-UNI, the interface output jitter shall be in accordance with the appropriatelimit given in ITU-T Recommendation G.825 [14] for the electrical and optical interface.Equipments having an electrical or optical B-UNI (e.g. B-NT1, B-NT2, B-TE) and which meet the outputjitter tolerance and the jitter transfer specifications given in ITU-T Recommendations G.825 [14] andG.958 [15] respectively, are assured of proper operation when the interface output jitter conforms to thelimits in ITU-T Recommendation G.825 [14].9Power feeding9.1Provision of powerThe provision of power to the B-NT1 via the UNI network interface is optional. If the power is provided viathe UNI, the following conditions shall apply:-a separate pair of wires shall be used for the provision of power to the B-NT1 via the TB referencepoint;-the power sink shall be fed by either:-a source under the responsibility of the user when requested by the network provider;-a power supply unit under the responsibility of the network provider connected to the mainselectric supply in the customer premises;-the capability of the provision of power by the user side shall be available either:-as an integral part of the B-NT2/B-TE; and/or-physically separated from the B-NT2/B-TE as an individual power supply unit;-a power source capable to feed more than one B-NT1 shall meet the requirements at eachindividual B-NT1 power feeding interface at the same point in time;-a short-circuit or overload condition in any B-NT1 shall not affect the power feeding interface of theother B-NT1s.9.2Power available at B-NT1The power available at the B-NT1 via the UNI shall be at least 15 W.9.3Feeding voltageThe feeding voltage at the B-NT1 shall be in the range of -20 V to -57 V relative to ground.SIST ETS 300 299 E2:2003

Page 25ETS 300 299: June 19979.4Safety requirementsIn order to harmonize power source and sink requirements the following is required:a)the power source shall be protected against short-circuits and overload;b)the power sink of B-NT1 shall not be damaged by an interchange of wires.With respect to the feeding interface of the power source, which is regarded as a touchable part in thesense of IEC Publication 950 [13], the protection methods against electric shock specified inIEC Publication 950 [13] may be applied.10Functions provided by the transmission convergence sublayer10.1Transfer capability10.1.1Interface at 155 520 kbit/sThe interface bit rate at the TB and SB reference points shall be 155 520 kbit/s. The bit rate available forthe ATM cells (user information cells, signalling cells, OAM cells, unassigned cells and cells used for cellrate decoupling) excluding physical layer overhead cells (physical OAM cells and idle cells) shall be149 760 kbit/s.10.1.2Interfac
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