1、BRITISH STANDARD BS EN 60835-3-13: 1997 BS 7573-3.13: 1997 IEC 835-3-13: 1996 Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth stations Section 3.13 VSAT systems The European Standard EN 60835-3-13:1996 has the status o
2、f a British Standard ICS 33.060.30BSEN 60835-3-13:1997 This British Standard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comes intoeffect on 15 February 1997 BSI 12-1998 The following BSI references relate
3、 to the work on this standard: Committee reference EPL/12/5 Draft for comment 95/210409 DC ISBN 0 580 26930 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee EPL/12, Radio communication, to Subcommittee EPL/12/5, Radio co
4、mmunication systems, upon which the following bodies were represented: British Broadcasting Corporation British Radio and Electronic Equipment Manufacturers Association British Telecommunications plc ERA Technology Ltd. Institution of Electrical Engineers Radio, Electrical and Television Retailers A
5、ssociation Radiocommunications Agency Amendments issued since publication Amd. No. Date CommentsBSEN60835-3-13:1997 BSI 12-1998 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 60835-3-13 3 List of references Inside back coverBSEN 60835-3-13:1997 i
6、i BSI 12-1998 National foreword This British Standard has been prepared by Subcommittee EPL/12/5 and is the English language version of EN 60835-3-13:1996 Methods of measurement for equipment used in digital microwave radio transmission systems Part3:Measurements on satellite earth stations: Section
7、 3.13 VSAT systems, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 835-3-13:1996 published by the International Electrotechnical Commission (IEC). BS EN 60835 is published in three Parts. The other Parts are: Part 1: Measurement common to
8、 terrestrial radio-relay systems and satellite earth stations; Part 2: Measurements on terrestrial radio-relay systems. Some of the many Sections of the three Parts have appeared under the number BS 7573, of the same genetic title. This Section describes measurements for very small aperture terminal
9、s (VSATs) of data transmit/receive type, both in the star network and in the point-to-point network. Measurements of the hub earth stations equipment are not covered. Cross-references Publication referred to Corresponding British Standard BS EN 60835 Methods of measurement for equipment used in digi
10、tal microwave radio transmission systems EN 60835-1-2:1993 Part 1 Measurements common to terrestrial (IEC 835-1-2:1992) radio-relay systems and satellite earth stations Section 1.2:1995 Basic characteristics EN 60835-1-4:1995 Section 1.4 Transmission performance 1) (IEC 835-1-4:1992) EN 60835-3-2:19
11、96 Part 3 Measurements on satellite earth stations (IEC 835-3-2:1994) Section 3.2:1996 Antenna EN 60835-3-7:1995 Section 3.7:1996 Figure-of-merit of receiving system (IEC 835-3-7:1995) EN 55022:1987 2) Limits and methods of measurement of radio (CISPR 22:1985) disturbance characteristics of informat
12、ion technology equipment A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages
13、 This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theins
14、ide front cover. 1) In preparation. 2) EN 55022:1987 has been superseded by EN 55022:1995 with which the cited British Standard is identical.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60835-3-13 July 1996 ICS 33.060.30 Descriptors: Telecommunications, radiocommunications, communication equ
15、ipment, earth station, microwave frequencies, digital technics, measurements, characteristics English version Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth stations Section 13: VSAT systems (IEC 835-3-13:1996) Mthode
16、s de mesure applicables au matriel utilis pour les systmes de transmission numrique en hyperfrquence Partie 3: Mesures applicables aux stations terriennes de tlcommunications par satellite Section 13: Systmes VSAT (CEI 835-3-13:1996) Meverfahren fr Gerte in digitalen Mikrowellen-Funkbertragungssyste
17、men Teil 3: Messungen an Satelliten-Erdfunkstellen Hauptabschnitt 13: VSAT-Systeme (IEC 835-3-13:1996) This European Standard was approved by CENELEC on 1996-07-02. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European S
18、tandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English,
19、French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgi
20、um, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Ele
21、ktrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1996 Copyright reserved to CENELEC members Ref. No. EN 60835-3-13:1996 EEN60835-3-13:1996 BSI 12-1998 2 Foreword The text of document 12E/237/FDIS, future edition1 of IEC 835-3-13, prepared by SC 12E, Radio-relay and fix
22、ed satellite commmunication systems, of IEC TC 12, Radiocommunications, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60835-3-13 on1996-07-02. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “i
23、nformative” are given for information only. In this standard, annex ZA is normative and annex A is informative. Annex ZA has been added by CENELEC. Contents Page Foreword 2 1 General 3 1.1 Scope 3 1.2 Normative references 3 2 General description 3 3 Methods of measurement 4 3.1 General consideration
24、s 4 3.2 Antenna 4 3.3 RF characteristics 4 3.4 Modulator/demodulator performance 7 3.5 End-to-end connection test 9 3.6 Monitor and control 10 Annex A (informative) Bibliography 13 Annex ZA (normative) Normative referencestointernational publications withtheircorresponding European publications 13 F
25、igure 1a Star type VSAT network 10 Figure 1b Point-to-point type VSAT network 11 Figure 2 Typical configuration of a VSAT 11 Figure 3a Test set-up for demodulator BERperformance (applicable for VSAT in star type networks) 12 Figure 3b Test set-up for VSAT look-back BER performance (applicable for VS
26、AT point-to-point links 12 Figure 4 Test set-up for end-to-end connection tests 12 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1997-04-01 latest date by which the national standards conflicting with the
27、EN have to be withdrawn (dow) 1997-04-01EN60835-3-13:1996 BSI 12-1998 3 1 General 1.1 Scope This section of IEC 835-3 deals with the methods of measurements applicable to very small aperture terminals (VSATs) of data transmit/receive type both in the star network (many VSATs controlled by the hub ea
28、rth station) and in the point-to-point network. Some clauses may also be applicable to the receive-only type VSATs. This section does not handle the measurements of the hub earth stations equipment. 1.2 Normative references The following normative documents contain provisions which, through referenc
29、e in this text, constitute provisions of this section of IEC 835-3. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this section of IEC 835-3 are encouraged to investigate the possibility of applying t
30、he most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 835-1-2:1992, Methods of measurement for equipment used in digital microwave radio transmission systems Part 1: Measurements common to terrest
31、rial radio-relay systems and satellite earth stations Section 2: Basic characteristics. IEC 835-1-4:1992, Methods of measurement for equipment used in digital microwave radio transmission systems Part 1: Measurements common to terrestrial radio-relay systems and satellite earth stations Section 4: T
32、ransmission performance. 835-3-2:1995, Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth stations Section 2: Antenna. IEC 835-3-7:1995, Methods of measurement for equipment used in digital microwave radio transmission sy
33、stems Part 3: Measurements on satellite earth stations Section 7: Figure-of-merit of receiving system. IEC CISPR 22:1985, Limits and methods of measurement of radio interference characteristics of information technology equipment. ITU-R 3)Recommendation S 725:1992, Technical characteristics for very
34、 small aperture terminals (VSATs). ITU-R Recommendation S729:1992, Control and monitoring function of very small aperture terminals (VSATs). ITU-T 3)Recommendation X 24:1988, List of definitions for interchange circuits between data terminal equipment (DTE) and data circuit-terminating equipment (DC
35、E) on public data circuit-terminating equipment (DCE) on public data networks. ITU-T Recommendation X25:1993, Interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicated cir
36、cuit. Radio Regulations, Appendix 8:1990, Table of maximum permitted spurious emission power levels. 2 General description VSATs are small, low-cost satellite earth stations which are equipped with small antennas (typically1m to 2m), with low power RF transmitters (typically 0,5W to 2W), and with co
37、mpact modem and signal processing units. They can be installed very easily on roof tops, on a wall, or in the car park of the users office building, where the user data terminals are located. They can be used very conveniently and economically to connect the user terminals to the central host comput
38、er located at a distant processing centre. The VSATs are usually used for digital data communications. However, it is possible to use them for voice and/or video communications by adding appropriate voice/video coder/decoders or by adding TV receivers to demodulate analog FM TV signals. VSATs are of
39、ten used in the star type network as shown inFigure 1a. VSATs communicate with a relatively large central earth station, called the hub earth station. In this case, the type of modulation, the bit rates, the coding and access techniques of the outbound (hub to VSAT) channel and the inbound (VSAT to
40、hub) channel are usually different in order to use the satellite channels effectively by multiple access schemes. In this type of VSAT networks the user data are usually processed by the VSAT and hub to support the various computer network protocols effectively. Point-to-point connections between VS
41、ATs as shown inFigure 1b are also used. In this case, the modulation rate and format of the transmitting and receiving signals of the VSAT are usually the same, and the user data are usually passed through the VSAT network transparently without the protocol processing. 3) Formerly CCIR.EN60835-3-13:
42、1996 4 BSI 12-1998 Usually a network control and monitoring computer is provided to control and monitor the network configuration and operation. A typical configuration of a VSAT is shown inFigure 2. It consists of an antenna, an outdoor unit (ODU) and an indoor unit (IDU). Offset parabolic type ant
43、ennas are widely used and often the feed horn is integrated with the ODU, which contains a low noise amplifier, a high power amplifier and up/down converters in a weatherproof housing and installed behind the antenna focal point. The IDU contains an i.f. circuit, a modem and a baseband signal proces
44、sor, and is installed near the user data terminals. The ODU and the IDU are connected by inter-facility link (IFL) cable(s). The ITU-R has established recommendations for technical characteristics of VSATs (see ITU-R Recommendations S725 and 729). 3 Methods of measurement 3.1 General considerations
45、The RF port of the ODU is often directly fitted with the antenna feed horn. In this case, it is necessary to separate the antenna and feed horn from the remaining part of the ODU by manufacturers instructions, to enable the measurement of the antenna parameters and the RF parameters at this interfac
46、e point. Sometimes it may be necessary to use appropriate waveguide adapters and/or transducers to connect the measuring equipment with this interface point. In such a case, the performance of such adapters and/or transducers should be calibrated. When the antenna feed horn is connected to the ODU t
47、hrough a feeder circuit, the feeder circuit may be included either in the antenna sub-system or in the ODU sub-system in the measurements, or its performance (e.g. loss) may be measured separately, as appropriate. Where the loss of the feeder circuit is measured separately, that loss should be subtr
48、acted when calculating the equivalent isotropically radiated power (EIRP) of the VSAT (see 3.3.3, 3.3.8 and 3.3.9). Since the control function inside the VSAT usually inhibits emission of the output RF signal when the VSAT in the star type network does not receive the appropriate control signal from
49、 the hub station, it may be necessary to follow the manufacturers instructions to force the VSAT to emit the signal by disabling such control function or by using the hub simulator with network control and monitoring computer or its emulator which generates the control signal (see 3.5). Most of the measurements described in this standard are performed as type tests. 3.2 Antenna See IEC 835-3-2. Ideally, the following items should be measured: a) on-axis gain; b) radiation pattern; c) cross-polarization discrimina
