SIST EN 301 080 V1.1.1:2003

• Abstract:

  This ETS will cover point to multipoint Digital Radio Relay Systems (DRRS) in the band 3 to 11 GHz using Frequency Division Multiple Access (FDMA) techniques. The frequency bands and channel spacing will also be identified.

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.040.20 - Transmission systems
• ICS: 33.060.30 - Radio relay and fixed satellite communications systems
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI EN 301 080 V1.1.1 (1999-02) - Transmission and Multiplexing (TM); Digital Radio Relay Systems (DRRS); Frequency Division Multiple Access (FDMA); Point-to-multipoint DRRS in the bands allocated to the fixed service in the range from 3 GHz to 11 GHz

SIST EN 301 080 V1.1.1:2003 is the SIST adoption of ETSI EN 301 080 V1.1.1 for point-to-multipoint Digital Radio Relay Systems (DRRS) using Frequency Division Multiple Access (FDMA) in the fixed-service bands from 3 GHz to 11 GHz. It sets minimum technical requirements for the radio system, its interfaces, spectrum use, environmental conditions, synchronization, and radio performance. It is aimed at manufacturers, operators, integrators, and test laboratories that need to design, specify, or verify these access links.

What does SIST EN 301 080 V1.1.1:2003 specify?

SIST EN 301 080 V1.1.1:2003 specifies the minimum requirements for FDMA point-to-multipoint DRRS in the terrestrial Fixed Service (FS) from 3 GHz to 11 GHz. It focuses on radio terminal and radio-relay equipment used to connect subscriber sites to public or private networks.

Clause 1 sets the scope, Clause 2 lists references, Clause 3 defines terms and abbreviations, Clauses 4 and 5 cover general characteristics and system parameters, and Clause 6 lists interface types at the subscriber equipment and network node. The foreword also states that equipment from different manufacturers is not expected to interwork at radio frequency, so this is not a common-air-interface standard.

Table 1 identifies the main CEPT/ERC band plans used for P-MP operation in this range, including the 3.4-3.6 GHz band and the paired 10.15-10.3/10.50-10.65 GHz bands. Table 2 links channel spacing to minimum CRS transmission capacity for different modulation states.

What are the key requirements of SIST EN 301 080 V1.1.1:2003?

Spectrum, channel arrangements and deployment

Clause 4.2 requires the system to fit at least one of the channel arrangements in Table 2, and it allows equivalent modulation schemes if the same capacity is achieved. In practice, this is the planning step: the vendor or operator must choose a channel spacing and modulation set that match the wanted capacity and the licensed spectrum.

Clause 4.3 says there is no requirement for a CRS from one manufacturer to operate with TS and RS equipment from another manufacturer. That means procurement must treat the full radio chain as a matched system unless a supplier declares otherwise.

Installation, power, EMC, synchronization and antennas

Clause 4.4 ties environmental robustness to ETS 300 019 classes, with the manufacturer declaring the class the equipment is designed for. Clause 4.5 requires the power supply interface to follow ETS 300 132, and Clause 4.6 applies ETS 300 385 provisionally for EMC. For buyers, this means indoor/outdoor siting, power feed, and EMC test basis must be stated and checked.

Clause 4.7 requires TMN interfaces, if present, to follow ITU-T G.773. Clause 4.8 requires synchronization methods for digital interfaces and points to ITU-T G.810, G.812, G.823, G.813, and G.825 depending on whether the system uses PDH or SDH interfaces. Clause 4.9A links antenna choice to ETS 300 833 or EN 302 085. In practice, the clocking, jitter, wander, and antenna type all have to match the network design and hop length.

Transmitter, receiver and spectrum limits

Clause 5.1 defines system capacity as the CRS payload bit rate supported over the air, and the manufacturer has to declare the maximum number of simultaneous carriers. Clause 5.2 limits round trip delay for a 64 kbit/s traffic channel to 20 ms, which matters for voice quality and call handling.

Clauses 5.5 and 5.6 set the radio-frequency limits. The maximum mean transmitter output power is capped, ATPC is optional but must be declared if used, and the standard gives spectrum masks, RF tolerance, and spurious emission limits for CRS, TS and RS equipment. These clauses are the main radio conformance checks in type testing.

Performance under load and interference

Clause 5.7 requires the system to maintain BER performance, dynamic level range, BBER, and interference immunity under declared load conditions. Separate thresholds are given for system types A and B, so test results must match the declared system type and modulation order.

Clause 5.7 also covers co-channel and adjacent-channel interference and includes a CW spurious interference check. For users, this is where link robustness, frequency planning, and coexistence with nearby systems are verified.

Clause 5.3 requires transparency, and Clause 5.4 lists voice coding methods such as G.711, G.726, G.728 and G.729. Clause 6 says at least one subscriber or network interface from the listed set has to be implemented.

What terms does SIST EN 301 080 V1.1.1:2003 define?

• Full Capacity Load (FCL) - the maximum number of 64 kbit/s signals or equivalent that a CRS can carry within a specified RF bandwidth while still meeting the stated performance and availability objectives.
• round trip delay - the total delay from point F to G and back from G to F, including repeaters where used.
• nominal output power - the maximum output power of the CRS, TS or RS, referred to point C', as declared by the manufacturer under FLC.
• Central Radio Station (CRS) - the central base station that contains the radio transceiver equipment and connects to the Terminal Station over the air.
• Terminal Station (TS) - the customer-site station that provides the subscriber interfaces.
• Repeater Station (RS) - a station used to extend coverage or route the link, and it may also provide subscriber interfaces.
• Automatic Transmit Power Control (ATPC) - a power-control feature that adjusts transmitted power automatically or under declared control ranges.

Who uses SIST EN 301 080 V1.1.1:2003?

Manufacturers use SIST EN 301 080 V1.1.1:2003 to design CRS, TS and RS equipment and to declare power, spectrum, timing, and interface characteristics. Network operators and planners use it to select band plans, channel spacing, antenna type, and the interface mix needed for access networks. Test laboratories and quality teams use it for conformance testing, radio performance checks, and acceptance of environmental, EMC, and synchronization requirements.

Which standards are used with SIST EN 301 080 V1.1.1:2003?

• ETS 300 019, ETS 300 132, ETS 300 385 - environmental classes, power supply interface, and EMC conditions.
• ITU-T G.773, G.810, G.812, G.823, G.813, G.825 - TMN interfaces and synchronization, jitter, and wander requirements.
• ETS 300 833 and EN 302 085 - antenna requirements for point-to-point and point-to-multipoint use.
• ITU-T G.703, G.711, G.726, G.728, G.729, O.151, O.181, G.131 - digital interface characteristics, voice coding, test equipment, and talker-echo control.
• ITU-R F.696-2, F.697-2, F.1189-1, ITU-T G.821, G.826 - error performance and availability objectives used for the system targets.
• Q.552, Q.553, R.20, G.961, G.962, G.707, G.964, G.965, G.957, ETS 300 012, ETS 300 011, ETS 300 324, ETS 300 347 - subscriber and network interface options such as analogue, ISDN, SDH and V5.x.

What does the SIST EN 301 080 V1.1.1:2003 document contain?

The document contains the system architecture in Figure 1 and the RF reference-point block diagram in Figure 2. It also includes channel plan and channel arrangement tables, antenna and environmental requirements, transmitter and receiver spectrum masks, RF tolerance and spurious emission limits, BER threshold tables for two system types, and interference sensitivity tables.

Clause 6 and Table 13 map subscriber and network interface types to the relevant ITU-T and ETS standards. The formulas in Clause 5.7.2 are used to calculate receive-level thresholds at other bit rates, and the test settings table for spectrum-mask measurement supports laboratory conformance work.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.*+]Transmission and Multiplexing (TM); Digital Radio Relay Systems (DRRS); Frequency Division Multiple Access (FDMA); Point-to-multipoint DRRS in the bands allocated to the fixed service in the range from 3 GHz to 11 GHz33.060.30Radiorelejni in fiksni satelitski komunikacijski sistemiRadio relay and fixed satellite communications systems33.040.20Prenosni sistemTransmission systemsICS:Ta slovenski standard je istoveten z:EN 301 080 Version 1.1.1SIST EN 301 080 V1.1.1:2003en01-december-2003SIST EN 301 080 V1.1.1:2003SLOVENSKI
STANDARD
EN 301 080 V1.1.1 (1999-02)European Standard (Telecommunications series)Transmission and Multiplexing (TM);Digital Radio Relay Systems (DRRS);Frequency Division Multiple Access (FDMA);Point-to-multipoint DRRS in the bands allocated to thefixed service in the range from 3 GHz to 11 GHzSIST EN 301 080 V1.1.1:2003

ETSIEN 301 080 V1.1.1 (1999-02)2ReferenceDEN/TM-04046 (a0000ico.PDF)KeywordsFDMA, multipoint, radio, RLL, 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 301 080 V1.1.1:2003

ETSIEN 301 080 V1.1.1 (1999-02)3ContentsIntellectual Property Rights.5Foreword.5Introduction.51Scope.72References.83Definitions, symbols and abbreviations.103.1Definitions.103.2Symbols.103.3Abbreviations.104General characteristics.124.1General system architecture.124.2Frequency bands and channel arrangements.134.2.1Channel plan.134.2.2Proposed channel arrangements.134.3Compatibility requirements.134.4Environmental conditions.134.4.1Equipment within weather protected locations (indoor locations).144.4.2Equipment for non-weather protected locations (outdoor locations).144.5Power supply.144.6Electromagnetic Compatibility (EMC) conditions.144.7Telecommunications Management Network (TMN) interfaces.144.8Synchronization of interface bit rates.144.9Branching / feeder / antenna requirements.154.9AAntenna radiation pattern.155System parameters.155.1System capacity.155.2Round trip delay.155.3Transparency.155.4Voice coding methods.155.5Transmitter characteristics.165.5.1Transmitter power range.165.5.2Automatic Transmit Power Control (ATPC).165.5.3Transmitter (Tx) Local Oscillator (LO) frequency arrangements.165.5.4RF spectrum mask.175.5.4.1RF spectrum mask for the central radio station.175.5.4.2RF-spectrum mask for the terminal station and the repeater station.185.5.5RF tolerance.185.5.6Spurious emissions.185.6Receiver characteristics.195.6.1Receiver (Rx) LO frequency arrangements.195.6.2Spurious emissions.195.7System performance without diversity.205.7.1Dynamic level range.205.7.2BER as a function of Receiver input Signal Level (RSL).205.7.3Equipment Background BER (BBER).215.7.4Interference sensitivity (external).225.7.4.1Co-channel interference.225.7.4.2Adjacent channel interference.225.7.5Distortion sensitivity.225.7.6Continuous Wave (CW) spurious interference.225.8System performance with diversity.23SIST EN 301 080 V1.1.1:2003

ETSIEN 301 080 V1.1.1 (1999-02)46Types of interfaces at the subscriber equipment and the network node.23Bibliography.24History.25SIST EN 301 080 V1.1.1:2003

ETSIEN 301 080 V1.1.1 (1999-02)5Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respectof ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on theETSI Web server (http://www.etsi.org/ipr).Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guaranteecan be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by ETSI Technical Committee Transmissionand Multiplexing (TM).The present document contains the minimum technical requirements to ensure compatibility of products andconformance with radio regulations across ETSI member states. Radio terminals from different manufacturers are notrequired to inter work at radio frequency (i.e. no common air interface).The present document is intended to cover a variety of systems designed for a variety of services, applications,performance objectives and deployment conditions. Therefore it is necessary to include in the present documentdifferent sets of system parameters. In the present document these set of parameters are referred to as "system types".National transposition datesDate of adoption of this EN:1 January 1999Date of latest announcement of this EN (doa):30 April 1999Date of latest publication of new National Standardor endorsement of this EN (dop/e):31 October 1999Date of withdrawal of any conflicting National Standard (dow):31 October 1999IntroductionThe main field of application of Point-to-Multipoint (P-MP) systems, using the Fixed Service (FS), is to provide accessto both public and private networks (Public Switched Telephone Network (PSTN), Public Data Network (PDN), etc.).By means of P-MP systems the network service area may cover scattered subscriber locations. The systems may beapplied to build new access networks by means of a multi cellular architecture, covering both urban and regional areas.Subscribers are offered the full range of services by the particular public or private network. Subscribers have access tothese services by means of the various standardized user network interfaces (e.g. 2-wire loop, and Integrated ServicesDigital Network (ISDN) ranging from basic rate to n × primary rate).P-MP systems provide standard network interfaces and transparently connect subscribers to the appropriate networknode. These systems allow a service to be connected to a number of subscribers ranging from a few to several thousand,and over a wide range of distances.P-MP systems are generally configured as pre-assigned systems or as Demand Assigned Multiple Access (DAMA) radiosystems.SIST EN 301 080 V1.1.1:2003

ETSIEN 301 080 V1.1.1 (1999-02)6The 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 difficulttopography. Moreover, a small number of sites are required for these installations, thus facilitating rapid implementationand minimizing maintenance requirements of the systems.Concentration means that m subscribers can share n radio channels (m being larger than n), allowing a better use of theavailable frequency spectrum at a lower equipment costs. The term "multi-access" means that every subscriber hasaccess to every channel (instead of a fixed assignment as in most multiplex systems). When a call is initiated, anavailable channel is allocated to it. When the call is terminated, the channel is released for another call.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 (service node) and the subscriber equipment communicates with each otherwithout being aware of the radio link.SIST EN 301 080 V1.1.1:2003

ETSIEN 301 080 V1.1.1 (1999-02)71ScopeThe present document specifies the minimum requirements for system parameters of Frequency Division MultipleAccess (FDMA) Point-to-Multipoint (P-MP) radio systems in the terrestrial Fixed Service (FS) operating in the bands3 GHz to 11 GHz.The system will provide access to both public and private networks (Public Switched Telephone Network (PSTN),Public Data Network (PDN), etc.) by means of the various standardized network interfaces (e.g. 2-wire loop, IntegratedServices Digital Network (ISDN) and 2 Mbit/s).The system may be applied to build access networks by means of a multi cellular architecture, covering urban, includingsuburban, and regional areas.The FDMA P-MP system will transmit a Radio Frequency (RF) signal from the customer site to the Central Station (CS)only utilizing a spectral bandwidth corresponding to that capacity which is requested from and assigned to the customerby pre-assignment or by Demand Assigned Multiple Access (DAMA). The CS receives from each customer site a singlemodulated carrier being processed independently within the CS. Thus the CS is receiving a FDMA signal.The present document covers the following typical P-MP applications:The transmission of:-voice;-fax;-voice band data;-telex;related to analogue interfaces and:-64 Kbit/s;-ISDN;-digital video;-digital audio;related to digital interfaces.Further applications like Asynchronous Transport Mode (ATM) may also be provided.Two classes of systems have been defined in order to take into account the large variety of possible applications due toaccess network implementations and type of service to be provided.The equipment covered by the present document should be designed to be able to meet the network performancerequirements foreseen by ITU-R Recommendations F.696-2 [1] and F.697-2 [2], for medium, local grade orITU-R Recommendation F.1189-1 [3] national portion (access or short haul) of the digital connection following thecriteria defined in ITU-T Recommendation(s) G.821 [4] and/or G.826 [5]. It should be noted that the values for B and Care provisional taking also into account note 5 of ITU-R Recommendation F.1189-1 [3].The availability requirements are under further study by the relevant bodies.Network operators may choose different performance and availability requirements in order to extend the possible areaof application thus fitting to their network needs.Radio terminals from different manufacturers are not intended to interwork 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.SIST EN 301 080 V1.1.1:2003

ETSIEN 301 080 V1.1.1 (1999-02)82ReferencesThe 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]ITU-R Recommendation F.696-2: "Error performance and availability objectives for hypotheticalreference digital sections forming part or all of the medium-grade portion of an ISDN connectionat a bit rate below the primary rate utilizing digital radio relay systems".[2]ITU-R Recommendation F.697-2: "Error performance and availability objectives for thelocal-grade portion at each end of an ISDN connection a bit rate below the primary rate utilizingdigital radio relay systems".[3]ITU-R Recommendation F.1189-1: "Error-Performance Objectives for constant bit rate digitalpaths at or above the primary rate carried by digital radio-relay systems which may form part or allthe national portion of a 27 500 km hypothetical reference path".[4]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".[5]ITU-T Recommendation G.826: "Error performance parameters and objectives for international,constant bit rate digital paths at or above the primary rate".[6]ERC Recommendation 14-03: "Harmonized radio frequency channel arrangements for low andmedium capacity systems in the band 3 400 MHz to 3 600 MHz".[7]ERC Recommendation 12-05: "Harmonized radio frequency channel arrangements for digitalterrestrial fixed systems operating in the band 10,0 to 10,68 GHz".[8]ETS 300 019: "Equipment engineering (EE); Environmental conditions and environmental tests fortelecommunication equipment; Part 1-3: Classification of environmental conditions; Stationary useat weatherprotected locations and Part 1-4: Classification of environmental conditions Stationaryuse at non-weatherprotected locations".[9]ETS 300 132: "Equipment engineering (EE); Power supply interface at the input totelecommunications equipment".[10]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".[11]Void.[12]ITU-T Recommendation G.773: "Protocol suites for Q-interfaces for management of transmissionsystems".[13]ITU-T Recommendation G.810: "Definitions and terminology for synchronization networks".[14]ITU-T Recommendation G.812: "Timing requirements at the output of slave clocks suitable forplesiochronous operation of international digital links".[15]ITU-T Recommendation G.823: "The control of jitter and wander within digital networks whichare based on the 2 048 kbit/s hierarchy".SIST EN 301 080 V1.1.1:2003

ETSIEN 301 080 V1.1.1 (1999-02)9[16]ITU-T Recommendation G.813: "Timing characteristics of SDH equipment slave clocks (SEC)".[17]ITU-T Recommendation G.825: "The control of jitter and wander within digital networks whichare based on the synchronous digital hierarchy (SDH)".[18]ETS 300 833: "Transmission and Multiplexing (TM); Digital Radio Relay Systems (DRRS);Antennas used in point-to-point DRRS operating in the frequency band 3 GHz to 60 GHz".[19]EN 302 085: "Fixed Radio Systems; Point-to-Multipoint Antennas; Antennas for point-to-multipoint fixed radio systems in the 3 GHz to 11 GHz band".[20]ITU-T Recommendation G.703: "Physical / electrical characteristics of hierarchical digitalinterfaces".[21]ITU-T Recommendation G.131: "Control of talker echo".[22]ITU-T Recommendation G.711: "Pulse code modulation (PCM) of voice frequencies".[23]ITU-T Recommendation G.726: "40, 32, 24, 16 kbit/s adaptive differential pulse code modulation(ADPCM)".[24]ITU-T Recommendation G.728: "Coding of speech at 16 kbit/s using low-delay code excited linearprediction".[25]ITU-T Recommendation G.729: "Coding of speech at 8 kbit/s using conjugate-structurealgebraic-code-excited linear-prediction".[26]ITU-T Recommendation O.151: "Error performance measuring equipment operating at the primaryrate and above".[27]ITU-T Recommendation O.181: "Equipment to assess error performance on STM-N interfaces".[28]ITU-R Recommendation SM.329-7: "Spurious Emissions".[29]Void.[30]ITU-T Recommendation Q.552: "Transmission characteristics at 2-wire analogue interfaces ofdigital exchanges".[31]ITU-T Recommendation Q.553: "Transmission characteristics at 4-wire analogue interfaces ofdigital exchanges".[32]ITU-T Recommendation R.20: "Telegraph modem for subscriber lines".[33]ITU-T Recommendation V.-series: "Data communication over the telephone network".[34]ITU-T Recommendation X.-series: "Data networks and open system communication".[35]ITU-T Recommendation G.961: "Digital transmission system on metallic local lines for the ISDNbasic rate access".[36]ETS 300 012: "Integrated Services Digital Network (ISDN); Basic user-network interface; Layer 1specification and test principles".[37]ETS 300 011: "Integrated Services Digital Network (ISDN); Primary rate user-network interface;Layer 1 specification and test principles".[38]ITU-T Recommendation G.962: "Access digital line section for ISDN primary rate at2 048 kbit/s".[39]ITU-T Recommendation G.707: "Network node interface for the synchronous digital hierarchy(SDH)".[40]ITU-T Recommendation G.964: "V-Interfaces at the digital local exchange (LE) - V5.1-interface(based on 2 048 kbit/s) for the support of access network (AN)".SIST EN 301 080 V1.1.1:2003

ETSIEN 301 080 V1.1.1 (1999-02)10[41]ITU-T Recommendation G. 965: "V-Interfaces at the digital local exchange (LE) - V5.2-interface(based on 2 048 kbit/s) for the support of access network (AN)".[42]ITU-T Recommendation G.957: "Optical interfaces for equipment and systems relating tosynchronous digital hierarchy".[43]ETS 300 324: "V interfaces at the digital Local Exchange (LE); V5.1 interface for the support ofAccess Network (AN)".[44]ETS 300 347: "V interfaces at the digital Local Exchange (LE); V5.2 interface for the support ofAccess Network (AN)".3Definitions, symbols and abbreviations3.1DefinitionsFor the purposes of the present document, the following terms and definitions apply:Full Capacity Load (FCL): the maximum number of 64 kbit/s signals or the equivalent which can be transmitted andreceived by a single Central Radio Station (CRS) within a specified RF bandwidth, fulfilling a given performance andavailability objectives in respect to fading conditions.round trip delay: the sum of the delay between point F to G plus G to F in figure 1 including any repeaters asappropriate.nominal output power: the maximum output power of the CRS, Terminal Station (TS) or Repeater Station (RS)referred to point C' (figure 2) under Full Load Condition (FLC), as declared by the manufacturer.3.2SymbolsFor the purposes of the present document, the following symbols apply:dBdecibeldBmdecibel relative to 1 mWGHzGigaHertzkmkilometreMbit/sMegabit per secondMHzMegaHertzppmparts per million3.3AbbreviationsFor the purposes of the present document, the following abbreviations apply:ATMAsynchronous Transport ModeATPCAutomatic Transmit Power ControlBBERBackground BERBERBit Error RatioCCSCentral Controller StationCEPTConférence des Administrations Européennes des Postes et TélécommunicationsCRSCentral Radio StationC
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