1、BRITISH STANDARD BS EN 60835-3-10: 1995 BS7573-3.10: 1995 IEC835-3-10: 1994 Methods of measurement for equipment used in digital microwave radio transmission systems Part3: Measurements on satellite earth stations Section3.10 Terminal equipment TDMA traffic earth station The European Standard EN6083
2、5-3-10:1994 has the status of a BritishStandard UDC 621.396.6:629.783:621.317.08BSEN 60835-3-10:1995 This BritishStandard, having been prepared under the directionof the ElectrotechnicalSector Board, was published under the authorityof the Standards Boardand comes into effect on 15August1995 BSI 01-
3、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 BritishStandard The preparation of this BritishStandard was entrusted to Technical Committee EPL/12, Radio communication,
4、 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 Association Radiocomm
5、unications Agency Amendments issued since publication Amd. No. Date CommentsBSEN 60835-3-10:1995 BSI 01-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN60835-3-10 3 List of references Inside back coverBSEN 60835-3-10:1995 ii BSI 01-2000 Nation
6、al foreword This BritishStandard has been prepared by Technical Committee EPL/12 and is the English language version of EN60835-3-10:1994 Methods of measurement for equipment used in digital microwave radio transmission systems Part3: Measurements on satellite earth stations Section3.10: Terminal eq
7、uipment TDMA traffic earth station, published by the European Committee for Electrotechnical Standardization(CENELEC). It is identical with IEC835-3-10:1994, published by the International Electrotechnical Commission(IEC). BS EN60835 is published in three Parts. The other Parts are: Part1: Measureme
8、nts common to terrestrial radio-relay systems and satellite earth stations; Part2: Measurements on terrestrial radio-relay systems. Some of the many Sections of the three Parts have appeared under the number BS7573, of the same generic title. This Section of BS EN60835 covers methods of measurement
9、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. In the Introduction, paragraph2, the abbreviatio
10、n “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 in the French text.) A British Standard does not
11、 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 International Standard Corresponding BritishStandar
12、d EN60835-1-2:1993 (IEC835-1-2:1992) BS EN60835 Methods of measurement for equipment used in digital microwave radio transmission systems Part1 Measurements common to terrestrial radio-relay systems and satellite earth stations. Section1.2:1995 Basic characteristics IEC835-1-4:1992 BS7573 Methods of
13、 measurement for equipment used in digital microwave radio transmission systems Part1 Measurements common to terrestrial radio-relay systems and satellite earth stations Section1.4:1993 Transmission performance Summary of pages This document comprises a front cover, an inside front cover, pages i an
14、d ii, the EN title page, pages2 to12, 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 cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN60835
15、-3-10 October1994 UDC 621.396.6:629.783:621.317.08 Descriptors: Radiocommunications, telecommunications, communication equipment, telecommunication terminals, earth stations, satellite broadcasting, digital technics, radio-relay systems, microwave frequencies, measurement, characteristics English ve
16、rsion Methods of measurement for equipment used in digital microwave radio transmission systems Part3: Measurements on satellite earth stations Section10: Terminal equipment TDMA traffic earth station (IEC835-3-10:1994) Mthodes de mesure applicables au matriel utilis pour les systmes de transmission
17、 numrique en hyperfrquence Partie3: Mesures applicables aux stations terriennes de tlcommunications par satellite Section10: Equipement terminal Station terrienne de trafic AMRT (CEI835-3-10:1994) Meverfahren fr Gerte in digitalen Mikrowellen-Funkbertragungs-systemen Teil3: Messungen an Satelliten-E
18、rdfunkstellen Hauptabschnitt10: Endeinrichtung-Erdfunkstelle fr TDMA-Betrieb (IEC835-3-10:1994) This European Standard was approved by CENELEC on1994-03-08. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
19、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, French, G
20、erman). 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, Belgium, Denma
21、rk, 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 Elektrotechn
22、ische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1994 Copyright reserved to CENELEC members Ref. No. EN60835-3-10:1994 EEN 60835-3-10:1994 BSI 01-2000 2 Foreword The text of document12(CO)148, as prepared by Subcommittee12E, Radio-relay and fixed satellite communication systems
23、, of IEC Technical Committee12, Radiocommunications, was submitted to the IEC-CENELEC parallel vote in May1993. The reference document was approved by CENELEC as EN60835-3-10 on8 March1994. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this s
24、tandard, Annex ZA is normative. Contents Page Foreword 2 Introduction 3 1 Scope 3 2 Normative references 3 3 I.F. interface characteristics 3 3.1 Return loss 3 3.2 Level, frequency and spectrum of the modulator output signal 3 3.3 Carrier on-off ratio 4 3.4 Phase and amplitude balance 4 4 Terrestria
25、l interface characteristics 4 4.1 Level and shape of the output signal 4 4.2 Other parameters 4 5 Bit error ratio 4 5.1 General consideration 4 5.2 Modem BER performance 4 5.3 Overall system BER performance 6 6 Frame acquisition and synchronization 6 6.1 General considerations 6 6.2 Clock frequency
26、and acquisition time 6 6.3 Receive frame acquisition and synchronization 6 6.4 Transmit frame acquisition 7 6.5 Transmit frame synchronization 7 6.6 Synchronization characteristics with additive noise 8 7 System control functions 8 7.1 General considerations 8 7.2 Reference station changeover test 8
27、 7.3 Burst Time Plan and/or Channel Mapping Plan change test 8 7.4 Other monitor and control function tests, including service channels 9 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications 11 Figure 1 Typical TDMA t
28、erminal equipment used in a traffic earth station 9 Figure 2 Typical arrangement for modem BER measurement 9 Figure 3 Typical arrangement for overall system BER test 10 Figure 4 Typical arrangement for frame acquisition/synchronization test 10 latest date of publication of an identical national stan
29、dard (dop) 1995-07-01 latest date of withdrawal of conflicting national standards (dow) 1995-07-01EN60835-3-10:1994 BSI 01-2000 3 Introduction In a TDMA(Time Division Multiple Access) satellite communication system, the reference earth station transmits the reference burst which provides a timing re
30、ference 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 stations are included in a TDMA system for redun
31、dancy 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/demodulator(PSK modem), Common TDMA Termina
32、l 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 typically70MHz or140MHz, and the TIE interfaces with the terrestrial digital circuits. The CTTE processes the transmit data from the TI
33、E, 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, the burst negator, the burst mode bit error ratio me
34、asuring 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 various built-in monitoring functions with indicato
35、rs 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 detailed procedures may be different. Therefore, it i
36、s 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 evaluated only by on-site tests which are outside the sco
37、pe 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, and/or the acquisition and synchronization scheme. In
38、 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 normative documents contain provisions which, through ref
39、erence in this text, constitute provisions of this section of IEC835-3. 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 IEC835-3 are encouraged to investigate the possibility of applyin
40、g the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC835-1-2:1992, Methods of measurement for equipment used in digital microwave radio transmission systems Part1: Measurements common to terres
41、trial radio-relay systems and satellite earth stations Section2: Basic characteristics. IEC835-1-4:1992, Methods of measurement for equipment used in digital microwave radio transmission systems Part1: Measurements common to terrestrial radio-relay systems and satellite earth stations Section4: Tran
42、smission 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 IEC835-1-2. The modulator is operating continuously. 3.2 Level, frequency and spectrum of the modulator output signal Ref
43、er to IEC835-1-2. 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 spectrum should also be measured in the burst mode.EN 60835-3-10:1994
44、 4 BSI 01-2000 The frequency of the modulator output signal should be measured in the continuous mode with no modulation(CW mode). 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
45、 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 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) mini
46、mum required on-off ratio. 3.4 Phase and amplitude balance This measurement is usually carried out for QPSK modulators. 3.4.1 Method of measurement Connect vector voltmeter probes to the modulated carrier output port and to the unmodulated carrier monitor port, if available. Apply static binary symb
47、ols(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 s
48、hould be presented by stating the difference between the measured and ideal values for the four individual states: a) in degrees for the phase unbalance, and b) in decibels for the amplitude unbalance. 3.4.3 Details to be specified The following items should be included, as required, in the detailed
49、 equipment specification: a) maximum permitted phase unbalance between the phase states relative to an ideal value; b) maximum permitted unbalance for the phase states. 4 Terrestrial interface characteristics 4.1 Level and shape of the output signal 4.1.1 Method of measurement Drive an appropriate input port of the TIE by a suitable p.r.b.s. generator. The applied signal should be looped back at an appropriate point(digital or i.f. loopback) so that a bit stream is obtained from the output port of the TIE to be measured. The level and
