SIST EN 301 021:1999

Transmission and Multiplexing (TM); Digital Radio Relay Systems (DRRS); Time Division Multiple Access (TDMA); Point-to-multipoint DRRS in Frequency Division Duplex (FDD) bands in the range 3 GHz to 11 GHz

This ETS will be applicable to P-MP digital radio relay systems. The frequency bands and relevant channel spacing will be identified by this ETS.

Prenos in multipleksiranje (TM) - Digitalni radiorelejni sistemi (DRRS) - Časovno porazdeljeni sodostop (TDMA) - Digitalni radijski sistem DRRS tipa točka-do-več točk v frekvenčnih pasovih za frekvenčno porazdeljeni duplex (FDD) v območju od 3 GHz do 11 GHz

General Information

• Status: Published
• Publication Date: 31-Oct-1999
• ICS: 33.060.20 - Receiving and transmitting equipment
• Technical Committee: RES - Radio equipment and systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Nov-1999
• Due Date: 01-Nov-1999
• Completion Date: 01-Nov-1999
• Ref Project: ETSI EN 301 021 V1.1.1 (1998-07) - Transmission and Multiplexing (TM); Digital Radio Relay Systems (DRRS); Time Division Multiple Access (TDMA); Point-to-multipoint DRRS in Frequency Division Duplex (FDD) bands in the range 3 GHz to 11 GHz

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Transmission and Multiplexing (TM); Digital Radio Relay Systems (DRRS); Time Division Multiple Access (TDMA); Point-to-multipoint DRRS in Frequency Division Duplex (FDD) bands in the range 3 GHz to 11 GHz33.060.20Sprejemna in oddajna opremaReceiving and transmitting equipmentICS:Ta slovenski standard je istoveten z:EN 301 021 V1.1.13SIST EN 301 021:1999en01-VHSWHPEHU-19993SIST EN 301 021:1999SLOVENSKI
STANDARD



SIST EN 301 021:1999



EN 301 021 V1.1.1 (1998-07)European Standard (Telecommunications series)Transmission and Multiplexing (TM);Digital Radio Relay Systems (DRRS);Time Division Multiple Access (TDMA);Point-to-multipoint DRRS in Frequency Division Duplex (FDD) bandsin the range 3 GHz to 11 GHzSIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)2ReferenceDEN/TM-04020 (9gc00ico.PDF)KeywordsDRRS, multipoint, radio, RLL, TDMA,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]://www.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 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)3ContentsIntellectual Property Rights.4Foreword.4Introduction.41Scope.61.1Applications.61.2Frequencies.61.3Access method.62Normative references.73Symbols and abbreviations.93.1Symbols.93.2Abbreviations.94General system architecture.104.1Sub-system types.104.2System characteristics.114.2.1System capacity.114.2.2Transmission error performance.114.2.3Round trip delay.114.2.4Transparency.114.2.5TMN interface.124.2.6Synchronization.125Radio characteristics.125.1Frequency bands.125.2Proposed channel arrangement.125.3Transmitter (TX) characteristics.135.3.1TX power range.135.3.2Automatic Transmit Power Control (ATPC).135.3.3Spectrum mask.135.3.4Transmitter spurious emissions.155.3.5Radio frequency tolerance.175.4Receiver characteristics.175.4.1Input level range.175.4.2Spurious emissions.175.4.3Bit Error Rate (BER) performance.185.4.4Interference sensitivity.185.4.4.1Adjacent channel interference.185.4.4.2Co-channel interference.185.4.5Image frequency rejection.195.5Antenna port characteristics.195.5.1RF interface.195.5.2Return loss.196Types of user equipment and service node interfaces.207Power supply and environmental characteristics.207.1Power supply.207.2Environmental conditions.217.2.1Equipment within weather protected locations.217.2.2Equipment for non-weather protected locations.217.3ElectroMagnetic Compatibility (EMC) conditions.21History.22SIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)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 ETR 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect ofETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the ETSIWeb server (http://www.etsi.fr/ipr or http://www.etsi.org/ipr).Pursuant to the ETSI Interim IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. Noguarantee can be given as to the existence of other IPRs not referenced in ETR 314 (or the updates on the ETSI Webserver) 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:3 July 1998Date of latest announcement of this EN (doa):31 October 1998Date of latest publication of new National Standardor endorsement of this EN (dop/e):30 April 1999Date of withdrawal of any conflicting National Standard (dow):30 April 1999IntroductionThe main field of application of Point-to-Multipoint (P-MP) systems is to provide access to both public and privatenetworks (Public Switched Telephone Networks (PSTN), Private Data Networks (PDN), .). By means of P-MPsystems the network service area may be extended to cover both distant and scattered user locations; and the systemsmay be applied to build new access networks covering both urban and rural areas.Users are offered the full range of services by the particular public or private network. Users have access to theseservices by means of the various standardized user network interfaces (2 wire loop, new data services and IntegratedServices Digital Network (ISDN) ranging from basic rate to n x primary rate)).P-MP systems provide standard network interfaces and transparently connect users to the appropriate network node.These systems allow a service to be connected to a number of users ranging from a few to several thousands and over awide range of distances.P-MP systems are generally configured as Pre-Assigned Multiple Access (PAMA) radio systems or as DemandAssigned Multiple Access (DAMA) radio systems.The essential features of a typical P-MP radio system are:-efficient use of the radio spectrum;-concentration;-transparency.Radio is often the ideal way of obtaining communications at low cost and almost independent of distance, and overdifficult topography. Moreover, a small number of sites are required for these installations, thus facilitating rapidimplementation and minimizing maintenance requirements of the systems.SIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)5Concentration means that "m" users can share "n" radio channels (m being larger than n), allowing a better use to bemade of the available frequency spectrum and at a lower equipment cost. The term "multi-access" derives from the factthat every user has access to every channel (instead of a fixed assignment as in most multiplex systems). When a demandarises an available channel (or channels) is allocated to it. When the demand is terminated, the channel is released forother use.Concentration requires the use of distributed intelligent control which in turn allows many other operation andmaintenance functions to be added.Transparency means that the network node and the user terminal communicate with each other without being aware ofthe radio path.Efficient use of the radio spectrum is generally achieved by reusing frequency sets at base stations in a cellular pattern.SIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)61Scope1.1ApplicationsThe present document specifies the minimum and optional requirements for system parameters of Time DivisionMultiple Access (TDMA) Point to Multipoint (P-MP) Radio Systems in the terrrestrial Fixed Service operating infrequency bands in the range 3 GHz to 11 GHz.The present document covers the following typical Point-to-Multipoint (P-MP) applications:-voice;-fax;-Voice-band data;-telex, related to analogue interfaces;-data up to 64 kbit/s or beyond with optional interfaces;-ISDN;- digital video;- digital audio, related to digital interfaces.Radio terminals from different manufacturers are not intended to inter-work at radio frequency (i.e. no common airinterface).The present document defines the requirements of radio terminal and radio-relay equipment including the interfaces.The requirements for multiplex, network management and antenna / feeder equipment may be addressed elsewhere.Testing to the present document will be undertaken with the guidance of a generic test methods documentEN 301 126 [22], which is under preparation.1.2FrequenciesThe present document covers fixed P-MP services operating in the 3,5 GHz, 3,7 GHz and 10,5 GHz bands and havingthe frequency plans as given in ERC Recommendations 14-03 [7], 12-08 [23] and 12-05 [8], respectively.1.3Access methodThe present document covers Time Division Multiple Access (TDMA) systems.SIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)72Normative referencesReferences may be made to either:a)specific versions of publications (identified by date of publication, edition number, version number, etc.), inwhich case, subsequent revisions to the referenced document do not apply; orb)all versions up to and including the identified version (identified by "up to and including" before the versionidentity); orc)all versions subsequent to and including the identified version (identified by "onwards" following the versionidentity); ord)publications without mention of a specific version, in which case 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 300 012 (1992): "Integrated Services Digital Network (ISDN); Basic user-network interfaceLayer 1 specification and test principles".[2]ITU-T Recommendation G.703: "Physical/electrical characteristics of hierarchical digitalinterfaces".[3]ITU-T Recommendation Q.553 (1994): "Transmission characteristics at 4-wire analogue interfacesof digital exchanges".[4]ITU-T Recommendation Q.552 (1994): "Transmission characteristics at 2-wire analogue interfacesof digital exchanges".[5]ITU-T Recommendation G.821: "Error performance of an international digital connectionoperating at a bit rate below the primary rate and forming part of an integrated services digitalnetwork".[6]ITU-T Recommendation R.20: "Telegraph modem for subscriber lines".[7]ERC Recommendation 14-03: "Harmonized radio frequency channel arrangements for low andmedium capacity systems in the band 3 400 MHz to 3 600 MHz".[8]ERC Recommendation 12-05: "Harmonized radio frequency channel arrangements for digitalterrestrial fixed systems operating in the band 10.0 - 10.68 GHz".[9]ETS 300 019, Parts 1 and 2 (1994): "Equipment Engineering (EE); Environmental conditions andenvironmental tests for telecommunications equipment; sub-parts 1-1 to 1-7: Classification ofenvironmental conditions; sub-parts 2-1 to 2-7: Specification of environmental tests".[10]ETS 300 132: "Equipment Engineering (EE); Power supply interface at the input totelecommunications equipment; Part 1: Operated by alternating current (ac)derived from directcurrent sources; and Part 2: Operated by direct current (dc)".[11]ITU-T Recommendation G.773 (1993): "Protocol suites for Q-interfaces for management oftransmission systems".[12]ETS 300 385: "Radio Equipment and Systems (RES); ElectroMagnetic Compatibility (EMC)standard for digital fixed radio links and ancillary equipment with data rates at around 2 Mbit/s andabove".[13]ITU-T Recommendation G.711: "Pulse code modulation (PCM) of voice frequencies".[14]ITU-T Recommendation G.726: "40, 32, 24, 16 kbit/s Adaptive Differential Pulse CodeModulation (ADPCM)".[15]ITU-T Recommendation G.728: "Coding of speech at 16 kbit/s using low-delay code excited linearprediction".SIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)8[16]ITU-R Recommendation F.697-1: "Error performance and availability objectives for thelocal-grade portion at each end of an ISDN connection utilizing digital radio-relay systems".[17]ETS 300 339: "Radio Equipment and Systems (RES); General Electro-Magnetic Compatibility(EMC) for radio equipment".[18]ITU-T Recommendation G.729: "Coding of speech at 8 kbit/s using conjugate-structurealgebraic-code-excited linear-prediction".[19]ETS 300 324 (1995): "Signalling Protocols and Switching (SPS); V interfaces at the digital LocalExchange (LE) V5.1 interface for the support of Access Network (AN); Part 1: V5.1 interfacespecification, Part 5: Structure and Test Purposes (TSS&TP) specification for the network layer(LE side) and Part 7: Structure and Test Purposes (TSS&TP) specification for the data link layer".[20]ETS 300 347 (1994): "Signalling Protocols and Switching (SPS); V interfaces at the digital LocalExchange (LE) V5.2 interface for the support of Access Network (AN) Part 1: V5.2 interfacespecification and Part 2: Protocol Implementation Conformance Statement (PICS) proforma".[21]ITU-R Recommendation F.1191: "Bandwidths and unwanted emissions of digital radio-relaysystems".[22]EN 301 126-1 and -2: "Conformance testing for Radio Relay Systems; Part 1: Point to PointEquipment Parameters; Part 2: Additional Parameters for P-MP Equipment".[23]ERC Recommendation 12-08: "Harmonized radio frequency channel arrangements and blocksallocations for medium and high capacity systems in the band 3 600 MHz to 4 200 MHz".[24]ITU-T Recommendation G.131: "Control of talker echo".[25]ITU-T Recommendation G.962: "Access digital line section for ISDN primary rate at2 048 kbit/s".SIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)93Symbols and abbreviations3.1SymbolsFor the purposes of the present document, the following symbols apply:HzHertzkHzkiloHertzMHzMegaHertzGHzGigaHertzkbit/skilobits per secondMbit/sMegabits per secondmsmilliseconddBdeciBeldBmdeciBel relative to 1 milliwatt3.2AbbreviationsFor the purposes of the present document, the following abbreviations apply:BERBit Error RatioBWeevaluation BandwidthBWrreference BandwidthCCSCentral Controller StationCSCentral StationCRSCentral Radio StationEMCElectromagnetic CompatibilityERCEuropean Radiocommunications CommitteeISDNIntegrated Services Digital NetworkPRBSPseudo-Random Binary SequenceRSRepeater StationTDMATime Division Multiple AccessTMNTelecommunications Management NetworkTSTerminal StationLD CELPLow Delay Code Excited Linear PredictionMOSMean Opinion ScoreQDUQuantization Distortion UnitTSHTerminal Station High frequencyTSLTerminal Station Low frequencyRSRepeater StationRSCRepeater Station CrossbandTETerminal EquipmentTXTransmitterSIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)104General system architecture4.1Sub-system typesA system could consist of several sub-systems as follows (see figure 1):Figure 1: General system architectureCS:The Central Station, which interfaces the network. It can be integrated or divided into two units:i)the Central Controller Station (CCS);ii)the Central Radio Station (CRS);TS:The Terminal Station (outstations with user interfaces). These are sub-divided into two types:i)TSH: (Terminal Station High frequency), i.e. > 3 GHz; andii)TSL: (Terminal Station Low frequency), i.e. < 3 GHz.SIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)11RS:The Repeater Station (radio repeater outstations with or without user interfaces). The repeater station can be divided into two types:i)RS: (Repeater Station), > 3 GHz; andii)RSC: (Repeater Station with Crossband), i.e. the frequency is transformed to a frequency in another bandwhich is below or above 3 GHz.The central station performs the interconnection with the local switching exchange (network node) carrying out aconcentration function by sharing the total number of available channels in the system. The central station is linkedeither directly to all Terminal Stations or via Repeater Stations (RS) by microwave transmission paths. Whenever anexisting digital transmission link is available, the network implementation can be optimized by separating the CCSinstalled
...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Transmission and Multiplexing (TM); Digital Radio Relay Systems (DRRS); Time Division Multiple Access (TDMA); Point-to-multipoint DRRS in Frequency Division Duplex (FDD) bands in the range 3 GHz to 11 GHz33.060.20Sprejemna in oddajna opremaReceiving and transmitting equipmentICS:Ta slovenski standard je istoveten z:EN 301 021 Version 1.1.1SIST EN 301 021:1999en01-november-1999SIST EN 301 021:1999SLOVENSKI
STANDARD



SIST EN 301 021:1999



EN 301 021 V1.1.1 (1998-07)European Standard (Telecommunications series)Transmission and Multiplexing (TM);Digital Radio Relay Systems (DRRS);Time Division Multiple Access (TDMA);Point-to-multipoint DRRS in Frequency Division Duplex (FDD) bandsin the range 3 GHz to 11 GHzSIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)2ReferenceDEN/TM-04020 (9gc00ico.PDF)KeywordsDRRS, multipoint, radio, RLL, TDMA,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]://www.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 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)3ContentsIntellectual Property Rights.4Foreword.4Introduction.41Scope.61.1Applications.61.2Frequencies.61.3Access method.62Normative references.73Symbols and abbreviations.93.1Symbols.93.2Abbreviations.94General system architecture.104.1Sub-system types.104.2System characteristics.114.2.1System capacity.114.2.2Transmission error performance.114.2.3Round trip delay.114.2.4Transparency.114.2.5TMN interface.124.2.6Synchronization.125Radio characteristics.125.1Frequency bands.125.2Proposed channel arrangement.125.3Transmitter (TX) characteristics.135.3.1TX power range.135.3.2Automatic Transmit Power Control (ATPC).135.3.3Spectrum mask.135.3.4Transmitter spurious emissions.155.3.5Radio frequency tolerance.175.4Receiver characteristics.175.4.1Input level range.175.4.2Spurious emissions.175.4.3Bit Error Rate (BER) performance.185.4.4Interference sensitivity.185.4.4.1Adjacent channel interference.185.4.4.2Co-channel interference.185.4.5Image frequency rejection.195.5Antenna port characteristics.195.5.1RF interface.195.5.2Return loss.196Types of user equipment and service node interfaces.207Power supply and environmental characteristics.207.1Power supply.207.2Environmental conditions.217.2.1Equipment within weather protected locations.217.2.2Equipment for non-weather protected locations.217.3ElectroMagnetic Compatibility (EMC) conditions.21History.22SIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)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 ETR 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect ofETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the ETSIWeb server (http://www.etsi.fr/ipr or http://www.etsi.org/ipr).Pursuant to the ETSI Interim IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. Noguarantee can be given as to the existence of other IPRs not referenced in ETR 314 (or the updates on the ETSI Webserver) 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:3 July 1998Date of latest announcement of this EN (doa):31 October 1998Date of latest publication of new National Standardor endorsement of this EN (dop/e):30 April 1999Date of withdrawal of any conflicting National Standard (dow):30 April 1999IntroductionThe main field of application of Point-to-Multipoint (P-MP) systems is to provide access to both public and privatenetworks (Public Switched Telephone Networks (PSTN), Private Data Networks (PDN), .). By means of P-MPsystems the network service area may be extended to cover both distant and scattered user locations; and the systemsmay be applied to build new access networks covering both urban and rural areas.Users are offered the full range of services by the particular public or private network. Users have access to theseservices by means of the various standardized user network interfaces (2 wire loop, new data services and IntegratedServices Digital Network (ISDN) ranging from basic rate to n x primary rate)).P-MP systems provide standard network interfaces and transparently connect users to the appropriate network node.These systems allow a service to be connected to a number of users ranging from a few to several thousands and over awide range of distances.P-MP systems are generally configured as Pre-Assigned Multiple Access (PAMA) radio systems or as DemandAssigned Multiple Access (DAMA) radio systems.The essential features of a typical P-MP radio system are:-efficient use of the radio spectrum;-concentration;-transparency.Radio is often the ideal way of obtaining communications at low cost and almost independent of distance, and overdifficult topography. Moreover, a small number of sites are required for these installations, thus facilitating rapidimplementation and minimizing maintenance requirements of the systems.SIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)5Concentration means that "m" users can share "n" radio channels (m being larger than n), allowing a better use to bemade of the available frequency spectrum and at a lower equipment cost. The term "multi-access" derives from the factthat every user has access to every channel (instead of a fixed assignment as in most multiplex systems). When a demandarises an available channel (or channels) is allocated to it. When the demand is terminated, the channel is released forother use.Concentration requires the use of distributed intelligent control which in turn allows many other operation andmaintenance functions to be added.Transparency means that the network node and the user terminal communicate with each other without being aware ofthe radio path.Efficient use of the radio spectrum is generally achieved by reusing frequency sets at base stations in a cellular pattern.SIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)61Scope1.1ApplicationsThe present document specifies the minimum and optional requirements for system parameters of Time DivisionMultiple Access (TDMA) Point to Multipoint (P-MP) Radio Systems in the terrrestrial Fixed Service operating infrequency bands in the range 3 GHz to 11 GHz.The present document covers the following typical Point-to-Multipoint (P-MP) applications:-voice;-fax;-Voice-band data;-telex, related to analogue interfaces;-data up to 64 kbit/s or beyond with optional interfaces;-ISDN;- digital video;- digital audio, related to digital interfaces.Radio terminals from different manufacturers are not intended to inter-work at radio frequency (i.e. no common airinterface).The present document defines the requirements of radio terminal and radio-relay equipment including the interfaces.The requirements for multiplex, network management and antenna / feeder equipment may be addressed elsewhere.Testing to the present document will be undertaken with the guidance of a generic test methods documentEN 301 126 [22], which is under preparation.1.2FrequenciesThe present document covers fixed P-MP services operating in the 3,5 GHz, 3,7 GHz and 10,5 GHz bands and havingthe frequency plans as given in ERC Recommendations 14-03 [7], 12-08 [23] and 12-05 [8], respectively.1.3Access methodThe present document covers Time Division Multiple Access (TDMA) systems.SIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)72Normative referencesReferences may be made to either:a)specific versions of publications (identified by date of publication, edition number, version number, etc.), inwhich case, subsequent revisions to the referenced document do not apply; orb)all versions up to and including the identified version (identified by "up to and including" before the versionidentity); orc)all versions subsequent to and including the identified version (identified by "onwards" following the versionidentity); ord)publications without mention of a specific version, in which case 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 300 012 (1992): "Integrated Services Digital Network (ISDN); Basic user-network interfaceLayer 1 specification and test principles".[2]ITU-T Recommendation G.703: "Physical/electrical characteristics of hierarchical digitalinterfaces".[3]ITU-T Recommendation Q.553 (1994): "Transmission characteristics at 4-wire analogue interfacesof digital exchanges".[4]ITU-T Recommendation Q.552 (1994): "Transmission characteristics at 2-wire analogue interfacesof digital exchanges".[5]ITU-T Recommendation G.821: "Error performance of an international digital connectionoperating at a bit rate below the primary rate and forming part of an integrated services digitalnetwork".[6]ITU-T Recommendation R.20: "Telegraph modem for subscriber lines".[7]ERC Recommendation 14-03: "Harmonized radio frequency channel arrangements for low andmedium capacity systems in the band 3 400 MHz to 3 600 MHz".[8]ERC Recommendation 12-05: "Harmonized radio frequency channel arrangements for digitalterrestrial fixed systems operating in the band 10.0 - 10.68 GHz".[9]ETS 300 019, Parts 1 and 2 (1994): "Equipment Engineering (EE); Environmental conditions andenvironmental tests for telecommunications equipment; sub-parts 1-1 to 1-7: Classification ofenvironmental conditions; sub-parts 2-1 to 2-7: Specification of environmental tests".[10]ETS 300 132: "Equipment Engineering (EE); Power supply interface at the input totelecommunications equipment; Part 1: Operated by alternating current (ac)derived from directcurrent sources; and Part 2: Operated by direct current (dc)".[11]ITU-T Recommendation G.773 (1993): "Protocol suites for Q-interfaces for management oftransmission systems".[12]ETS 300 385: "Radio Equipment and Systems (RES); ElectroMagnetic Compatibility (EMC)standard for digital fixed radio links and ancillary equipment with data rates at around 2 Mbit/s andabove".[13]ITU-T Recommendation G.711: "Pulse code modulation (PCM) of voice frequencies".[14]ITU-T Recommendation G.726: "40, 32, 24, 16 kbit/s Adaptive Differential Pulse CodeModulation (ADPCM)".[15]ITU-T Recommendation G.728: "Coding of speech at 16 kbit/s using low-delay code excited linearprediction".SIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)8[16]ITU-R Recommendation F.697-1: "Error performance and availability objectives for thelocal-grade portion at each end of an ISDN connection utilizing digital radio-relay systems".[17]ETS 300 339: "Radio Equipment and Systems (RES); General Electro-Magnetic Compatibility(EMC) for radio equipment".[18]ITU-T Recommendation G.729: "Coding of speech at 8 kbit/s using conjugate-structurealgebraic-code-excited linear-prediction".[19]ETS 300 324 (1995): "Signalling Protocols and Switching (SPS); V interfaces at the digital LocalExchange (LE) V5.1 interface for the support of Access Network (AN); Part 1: V5.1 interfacespecification, Part 5: Structure and Test Purposes (TSS&TP) specification for the network layer(LE side) and Part 7: Structure and Test Purposes (TSS&TP) specification for the data link layer".[20]ETS 300 347 (1994): "Signalling Protocols and Switching (SPS); V interfaces at the digital LocalExchange (LE) V5.2 interface for the support of Access Network (AN) Part 1: V5.2 interfacespecification and Part 2: Protocol Implementation Conformance Statement (PICS) proforma".[21]ITU-R Recommendation F.1191: "Bandwidths and unwanted emissions of digital radio-relaysystems".[22]EN 301 126-1 and -2: "Conformance testing for Radio Relay Systems; Part 1: Point to PointEquipment Parameters; Part 2: Additional Parameters for P-MP Equipment".[23]ERC Recommendation 12-08: "Harmonized radio frequency channel arrangements and blocksallocations for medium and high capacity systems in the band 3 600 MHz to 4 200 MHz".[24]ITU-T Recommendation G.131: "Control of talker echo".[25]ITU-T Recommendation G.962: "Access digital line section for ISDN primary rate at2 048 kbit/s".SIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)93Symbols and abbreviations3.1SymbolsFor the purposes of the present document, the following symbols apply:HzHertzkHzkiloHertzMHzMegaHertzGHzGigaHertzkbit/skilobits per secondMbit/sMegabits per secondmsmilliseconddBdeciBeldBmdeciBel relative to 1 milliwatt3.2AbbreviationsFor the purposes of the present document, the following abbreviations apply:BERBit Error RatioBWeevaluation BandwidthBWrreference BandwidthCCSCentral Controller StationCSCentral StationCRSCentral Radio StationEMCElectromagnetic CompatibilityERCEuropean Radiocommunications CommitteeISDNIntegrated Services Digital NetworkPRBSPseudo-Random Binary SequenceRSRepeater StationTDMATime Division Multiple AccessTMNTelecommunications Management NetworkTSTerminal StationLD CELPLow Delay Code Excited Linear PredictionMOSMean Opinion ScoreQDUQuantization Distortion UnitTSHTerminal Station High frequencyTSLTerminal Station Low frequencyRSRepeater StationRSCRepeater Station CrossbandTETerminal EquipmentTXTransmitterSIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)104General system architecture4.1Sub-system typesA system could consist of several sub-systems as follows (see figure 1):Figure 1: General system architectureCS:The Central Station, which interfaces the network. It can be integrated or divided into two units:i)the Central Controller Station (CCS);ii)the Central Radio Station (CRS);TS:The Terminal Station (outstations with user interfaces). These are sub-divided into two types:i)TSH: (Terminal Station High frequency), i.e. > 3 GHz; andii)TSL: (Terminal Station Low frequency), i.e. < 3 GHz.SIST EN 301 021:1999



ETSIEN 301 021 V1.1.1 (1998-07)11RS:The Repeater Station (radio repeater outstations with or without user interfaces). The repeater station can be divided into two types:i)RS: (Repeater Station), > 3 GHz; andii)RSC: (Repeater Station with Crossband), i.e. the frequency is transformed to a frequency in another bandwhich is below or above 3 GHz.The central station performs the interconnection with the local switching exchange (network node) carrying out aconcentration function by sharing the total number of available channels in the system. The central station is linkedeither directly to all Terminal Stations or via Repeater Stations (RS) by microwave transmission paths. Whenever anexisting digital transmission link is available, the network implementation can be optimized by separating the CCSinstalle
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