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1、BRITISH STANDARD BS EN 60835-3-10: 1995 BS 7573-3.10: 1995 IEC 835-3-10: 1994 Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth stations Section 3.10 Terminal equipment TDMA traffic earth station The European Standard EN
2、 60835-3-10:1994 has the status of a British Standard UDC 621.396.6:629.783:621.317.08 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:20:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60835-3-10:1995 This British Standard, having been prepared under the direction of the Electrotechni
3、cal Sector Board, was published under the authority of the Standards Board and comes into effect on 15 August 1995 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference EPL/12 Draft for comment 91/30989 DC ISBN 0 580 24399 0 Committees responsible for this
4、 British Standard The preparation of this British Standard was entrusted to Technical Committee EPL/12, Radio communication, upon which the following bodies were represented: British Broadcasting Corporation British Radio and Electronic Equipment Manufacturers Association British Telecommunications
5、plc ERA Technology Ltd. Institution of Electrical Engineers Radio, Electrical and Television Retailers Association Radiocommunications Agency Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:20:16 GMT+00:00 2006, Uncontrolled Copy, (c
6、) BSI BS EN 60835-3-10:1995 BSI 01-2000i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 60835-3-103 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:20:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60
7、835-3-10:1995 ii BSI 01-2000 National foreword This British Standard has been prepared by Technical Committee EPL/12 and is the English language version of EN 60835-3-10:1994 Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite e
8、arth stations Section 3.10: Terminal equipment TDMA traffic earth station, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 835-3-10:1994, published by the International Electrotechnical Commission (IEC). BS EN 60835 is published in three P
9、arts. The other Parts are: Part 1: Measurements common to 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 generic title. This Sectio
10、n of BS EN 60835 covers methods of measurement for Time Division Multiple Access (TDMA) terminal equipment used in many international and regional traffic earth stations. Additional information In adopting the text of the International Standard the typographical errors listed below were discovered.
11、In the Introduction, paragraph 2, the abbreviation “TIM” for “Terrestrial Interface Modules” should read “TIE” for consistency with later references to it. In the figures, the abbreviation “TIE” refers to the synonymous term “Terrestrial Interface Equipment”. (The term “Equipment” is used throughout
12、 in the French text.) 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. Cross-references In
13、ternational StandardCorresponding British Standard EN 60835-1-2:1993 (IEC 835-1-2:1992) BS EN 60835 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 1.2:1995 B
14、asic characteristics IEC 835-1-4:1992BS 7573 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 1.4:1993 Transmission performance Summary of pages This document c
15、omprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 12, 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 the inside front cove
16、r. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:20:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60835-3-10 October 1994 UDC 621.396.6:629.783:621.317.08 Descriptors: Radiocommunications, telecommunications, communication equipment, t
17、elecommunication terminals, earth stations, satellite broadcasting, digital technics, radio-relay systems, microwave frequencies, measurement, characteristics English version Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite e
18、arth stations Section 10: Terminal equipment TDMA traffic earth station (IEC 835-3-10:1994) Mthodes 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 10: E
19、quipement terminal Station terrienne de trafic AMRT (CEI 835-3-10:1994) Meverfahren fr Gerte in digitalen Mikrowellen-Funkbertragungs-systemen Teil 3: Messungen an Satelliten-Erdfunkstellen Hauptabschnitt 10: Endeinrichtung-Erdfunkstelle fr TDMA-Betrieb (IEC 835-3-10:1994) This European Standard was
20、 approved by CENELEC on 1994-03-08. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such
21、 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, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own la
22、nguage and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,
23、 Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1994 Copyright reserved to CENELEC members Ref. N
24、o. EN 60835-3-10:1994 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:20:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60835-3-10:1994 BSI 01-2000 2 Foreword The text of document 12(CO)148, as prepared by Subcommittee 12E, Radio-relay and fixed satellite communication systems, of IEC
25、Technical Committee 12, Radiocommunications, was submitted to the IEC-CENELEC parallel vote in May 1993. The reference document was approved by CENELEC as EN 60835-3-10 on 8 March 1994. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this stand
26、ard, Annex ZA is normative. Contents Page Foreword2 Introduction3 1Scope3 2Normative references3 3I.F. interface characteristics3 3.1Return loss3 3.2Level, frequency and spectrum of the modulator output signal3 3.3Carrier on-off ratio4 3.4Phase and amplitude balance4 4Terrestrial interface character
27、istics4 4.1Level and shape of the output signal4 4.2Other parameters4 5Bit error ratio4 5.1General consideration4 5.2Modem BER performance4 5.3Overall system BER performance6 6Frame acquisition and synchronization6 6.1General considerations6 6.2Clock frequency and acquisition time6 6.3Receive frame
28、acquisition and synchronization6 6.4Transmit frame acquisition7 6.5Transmit frame synchronization7 6.6Synchronization characteristics with additive noise8 7System control functions8 7.1General considerations8 7.2Reference station changeover test8 7.3Burst Time Plan and/or Channel Mapping Plan change
29、 test8 7.4Other monitor and control function tests, including service channels9 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications11 Figure 1 Typical TDMA terminal equipment used in a traffic earth station9 Figure 2
30、 Typical arrangement for modem BER measurement9 Figure 3 Typical arrangement for overall system BER test10 Figure 4 Typical arrangement for frame acquisition/synchronization test10 latest date of publication of an identical national standard(dop) 1995-07-01 latest date of withdrawal of conflicting n
31、ational standards(dow) 1995-07-01 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:20:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60835-3-10:1994 BSI 01-20003 Introduction In a TDMA (Time Division Multiple Access) satellite communication system, the reference earth station transmits th
32、e reference burst which provides a timing reference to the traffic (non-reference) earth stations. In many TDMA systems, the reference earth station monitors the operation of the traffic earth stations, and controls them in case of a burst plan change, etc. Usually, at least two reference earth stat
33、ions are included in a TDMA system for redundancy purposes. A block diagram of typical TDMA terminal equipment for a traffic earth station is shown in Figure 1. This section deals mainly with the method of measurement for the TDMA terminal used in traffic earth stations. It consists of PSK modulator
34、/demodulator (PSK modem), Common TDMA Terminal Equipment (CTTE) and one or more Terrestrial Interface Modules (TIM). The PSK modem interfaces with the earth station r.f. equipment at an intermediate frequency of typically 70 MHz or 140 MHz, and the TIE interfaces with the terrestrial digital circuit
35、s. The CTTE processes the transmit data from the TIE, produces transmit bursts, processes received bursts and sends recovered data to the TIE. It also controls the acquisition and synchronization functions. Special measuring equipment specific to the system, such as the reference burst generators, t
36、he burst negator, the burst mode bit error ratio measuring set, etc., may sometimes be required for measurement of the TDMA terminal equipment. They may be provided by the manufacturer of the TDMA equipment if they are not commercially available. The TDMA terminal equipment is usually provided with
37、various built-in monitoring functions with indicators and/or displays. In some cases, the tests are performed using these monitoring functions. Because different system designs may exist for some TDMA systems, some of the methods of measurement described here may be inappropriate, or at least the de
38、tailed procedures may be different. Therefore, it is necessary to consult the responsible system operator and/or the equipment manufacturer, before beginning the measurements. Some performance characteristics may be affected by the satellite round-trip delay time. These effects can usually be evalua
39、ted only by on-site tests which are outside the scope of this section. 1 Scope This section deals with methods of measurement on Time Division Multiple Access (TDMA) terminal equipment. There are various type of TDMA systems which may differ, for instance, in the bit rate, the frame/burst format, an
40、d/or the acquisition and synchronization scheme. In this section, the methods of measurement are described as generally as possible so that they may be applicable to various TDMA terminal equipment used in many international and regional satellite systems. 2 Normative references The following normat
41、ive documents contain provisions which, through reference 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
42、 encouraged to investigate the possibility of applying the 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 tra
43、nsmission systems Part 1: Measurements common to terrestrial 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
44、-relay systems and satellite earth stations Section 4: Transmission performance. 3 I.F. interface characteristics 3.1 Return loss The return loss of the modulator output port and the demodulator input port should be measured according to IEC 835-1-2. The modulator is operating continuously. 3.2 Leve
45、l, frequency and spectrum of the modulator output signal Refer to IEC 835-1-2. The level and the spectrum of the modulator output signal should be measured by operating the modulator continuously with a pseudo-random binary sequence (p.r.b.s.) present at the modulator input. If required, the spectru
46、m should also be measured in the burst mode. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:20:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60835-3-10:1994 4 BSI 01-2000 The frequency of the modulator output signal should be measured in the continuous mode with no modulation (CW mode)
47、. 3.3 Carrier on/off ratio 3.3.1 Method of measurement Connect a spectrum analyzer to the output port of the modulator and measure the level of the carrier signal with the modulator output on and off. The on-off ratio is the difference of the two levels in decibels. 3.3.2 Presentation of results The
48、 results should be presented in decibels. 3.3.3 Detail to be specified The following item should be included, as required, in the detailed equipment specification: a) minimum required on-off ratio. 3.4 Phase and amplitude balance This measurement is usually carried out for QPSK modulators. 3.4.1 Met
49、hod of measurement Connect vector voltmeter probes to the modulated carrier output port and to the unmodulated carrier monitor port, if available. Apply static binary symbols (00,01,11,10) to the I/Q baseband input port in sequences, and measure output carrier phase/amplitude related to unmodulated carrier for each state. Instead of the vector voltmeter, a constellation analyzer using the above principle can also be applied. 3.4.2 Presentation of results The results should be presented by stating the difference between th