1、 ETSI EN 301 428 V1.3.1 (2006-02)Candidate Harmonized European Standard (Telecommunications series) Satellite Earth Stations and Systems (SES);Harmonized EN for Very Small Aperture Terminal (VSAT);Transmit-only, transmit/receive or receive-only satellite earth stations operating in the 11/12/14 GHz
2、frequency bandscovering essential requirements under article 3.2 of the R Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp).
3、Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present
4、 document. Foreword This Candidate Harmonized European Standard (Telecommunications series) has been produced by ETSI Technical Committee Satellite Earth Stations and Systems (SES). The present document has been produced by ETSI in response to a mandate from the European Commission issued under Dire
5、ctive 98/34/EC 3 (as amended) laying down a procedure for the provision of information in the field of technical standards and regulations. The present document is intended to become a Harmonized Standard, the reference of which will be published in the Official Journal of the European Communities r
6、eferencing the Directive 1999/5/EC 1 of the European Parliament and of the Council of 9 March 1999 on radio equipment and telecommunications terminal equipment and the mutual recognition of their conformity (“R - it provides scope for standards to be added: - under article 3.2 when new frequency ban
7、ds are agreed; or - under article 3.3 should the Commission take the necessary decisions without requiring alteration of standards that are already published; - it clarifies, simplifies and promotes the usage of Harmonized Standards as the relevant means of conformity assessment. Remarks on the pres
8、ent document The present document allows the choice of either a class A Control and Monitoring system or a class B Control and Monitoring system. The class B system is more suitable for networks comprising very many terminals. The determination of the parameters of the user earth stations using a gi
9、ven geo-stationary satellite for the protection of the spectrum allocated to that satellite, is considered to be under the responsibility of the satellite operator or the satellite network operators. For this reason the requirement on the cross polarization discrimination which was in TBR 28 (see Bi
10、bliography) has not been copied in the present document and inter-modulation limits inside the band 14,0 GHz to 14,5 GHz are to be determined by system design and are subject to satellite operator specifications. The requirements have been selected to ensure an adequate level of compatibility with o
11、ther radio services. The levels, however, do not cover extreme cases which may occur in any location but with a low probability of occurrence. The present document may not cover those cases where a potential source of interference which is producing individually repeated transient phenomena or a con
12、tinuous phenomenon is present, e.g. a radar or broadcast site in the near vicinity. In such a case it may be necessary to use special protection applied to either the source of interference, or the interfered part or both. The present document does not contain any requirement, recommendation or info
13、rmation about the installation of the VSAT. ETSI ETSI EN 301 428 V1.3.1 (2006-02) 10All parts of the indoor unit related to reception, processing and presentation of the received information except the control channel are not within the scope of the present document. The syntax of the control channe
14、l messages is outside the scope of the present document. ETSI ETSI EN 301 428 V1.3.1 (2006-02) 111 Scope The present document applies to Very Small Aperture Terminals (VSATs) which have the following characteristics: The VSAT is operating in one or more frequency ranges in the part of the following
15、bands allocated exclusively to the Fixed Satellite Services (FSS): - 14,00 GHz to 14,25 GHz (earth-to-space); - 12,50 GHz to 12,75 GHz (space-to-earth); or in the shared parts of the following bands, allocated to the FSS and Fixed Services (FS): - 14,25 GHz to 14,50 GHz (earth-to-space); - 10,70 GHz
16、 to 11,70 GHz (space-to-earth). The VSAT uses linear polarization. The VSAT operates through a geostationary satellite at least 3 away from any other geostationary satellite operating in the same frequency band and covering the same area. The VSAT antenna diameter does not exceed 3,8 m, or equivalen
17、t effective area. The VSAT is either: - a transmit only VSAT: designed for transmission only of radio-communications signals in any of the frequency bands (earth-to-space) specified above; or - a transmit and receive VSAT: designed for transmission and reception of radio-communications signals in an
18、y of the frequency bands specified above; or - a receive only VSAT: designed for reception only of radio-communications signals in any of the frequency bands (space-earth) specified above. The VSAT is designed usually for unattended operation. The VSAT is operating as part of a satellite network (e.
19、g. star, mesh or point-to-point) used for the distribution and/or exchange of information between users. The transmit-only and transmit-and-receive VSAT is controlled and monitored by a Centralized Control and Monitoring Function (CCMF). The CCMF is outside the scope of the present document. The pre
20、sent document applies to the VSAT with its ancillary equipment and its various terrestrial ports, and when operated within the boundary limits of the operational environmental profile declared by the applicant and when installed as required by the applicant by declaration or in the user documentatio
21、n. The present document is intended to cover the provisions of Directive 1999/5/EC (R and b) the equipment cannot be used on a stand alone basis, to provide user functions independently of the VSAT; and c) the absence of the equipment does not inhibit the operation of the VSAT. applicant: manufactur
22、er or his authorized representative within the European Community or the person responsible for placing the apparatus on the market carrier-off radio state: radio state in which the VSAT may transmit and does not transmit any carrier NOTE 1: The phrase “the VSAT may transmit“ means that all the cond
23、itions for transmission are satisfied (e.g. in a state where transmissions are permitted and no failure detected). NOTE 2: The existence of a “Carrier-off“ radio state depends on the system of transmission used. For VSATs designed for continuous transmission mode there may be no “Carrier-off“ radio
24、state. carrier-on radio state: radio state in which the VSAT may transmit and transmits a carrier Centralized Control and Monitoring Functions (CCMF): set of functional entities that, at system level, monitor and control the correct operation of all transmit VSAT in a network Control Channel (CC): c
25、hannel or channels by which VSAT receive control information from the CCMF ETSI ETSI EN 301 428 V1.3.1 (2006-02) 13EIRPmax: maximum e.i.r.p capability of the VSAT as declared by the applicant EIRPnom: either: (i) EIRPmax; (ii) or, when uplink power control is implemented, the maximum required e.i.r.
26、p of the VSAT under clear sky condition as declared by the applicant. NOTE: The applicant may declare different values of EIRPmaxand EIRPnomfor each combination of occupied bandwidth and transmission parameters (see clause 4.1.3). emissions disabled radio state: radio state in which the VSAT must no
27、t transmit a carrier NOTE: This radio state only applies in certain CMF states as defined in clause 4.1.4. (e.g. before system monitoring pass, before the control channel is received, when a failure is detected, when the VSAT is commanded to disable). The “Emissions disabled“ radio state requires lo
28、wer unwanted emissions than the “Carrier-off“ radio state. environmental profile: range of environmental conditions under which equipment within the scope of EN 301 428 is required to comply with the provisions of EN 301 428 external control channel: control channel which is either (i) carried by th
29、e VSAT network via the same or another satellite, but not within the internal protocol of the VSAT system, or (ii) carried by the PSTN or some other means external response channel: response channel which is either (i) carried by the VSAT network via the same or another satellite, but not within the
30、 internal protocol of the VSAT system, or (ii) carried by the PSTN or some other means indoor unit: is composed of that part of the VSAT which is not part of the outdoor unit. It is generally installed inside a building and is connected to the outdoor unit. The connection cable between the outdoor a
31、nd indoor unit is considered part of the indoor unit integral antenna: antenna which may not be removed during the tests according to the applicants statement internal control channel: control channel which is carried by the VSAT network via the same satellite as used for transmission of user data a
32、nd within the internal protocol structure of the VSAT system internal response channel: response channel which is carried by the VSAT network via the same satellite as used for transmission of user data and within the internal protocol structure of the VSAT system network: in EN 301 428 a network is
33、 any network configuration including star, mesh and point-to-point configurations nominated bandwidth: bandwidth of the VSAT radio frequency transmission is nominated by the applicant. NOTE 1: The nominated bandwidth is centred on the transmit frequency and does not exceed 5 times the occupied bandw
34、idth. NOTE 2: The nominated bandwidth is wide enough to encompass all spectral elements of the transmission which have a level greater than the specified spurious radiation limits. The nominated bandwidth is wide enough to take account of the transmit carrier frequency stability. This definition is
35、chosen to allow flexibility regarding adjacent channel interference levels which will be taken into account by operational procedures depending on the exact transponder carrier assignment situation. occupied bandwidth: for a digital modulation scheme-the width of the signal spectrum 10 dB below the
36、maximum in-band density. For an analogue modulation scheme-the width of a frequency band such that, below the lower and above the upper frequency limits, the mean power emitted is equal to 0,5 % of the total mean power of the emission outdoor unit: part of the VSAT intended to be installed outdoor,
37、as declared by the applicant, or as indicated in the user documentation The outdoor unit usually comprises three main parts: a) the antenna sub-system which converts the incident radiation field into a guided wave and vice versa; b) the Low Noise Block (LNB) down converter, which is a device that am
38、plifies, with very low internal noise, the received signals in the Radio Frequency (RF) band and converts them to intermediate frequencies; ETSI ETSI EN 301 428 V1.3.1 (2006-02) 14c) the up-converter and the power amplifier which convert from the intermediate frequency to RF and amplify the low leve
39、l RF signals for transmission through the antenna subsystem. NOTE: The installation equipment (means of attachment) is outside the scope of EN 301 428. However, the antenna structures and other components directly mounted on the antenna and forming an integral part of it, are subject to the specific
40、ations of EN 301 428. removable antenna: antenna which may be removed during the tests according to the applicants statement Response Channel (RC): channel by which VSAT transmit monitoring information to the CCMF spurious radiation: any radiation outside the nominated bandwidth NOTE: For a receive-
41、only VSAT there is no nominated bandwidth therefore any radiation is a spurious radiation. transmission disabled state: VSAT is in this state when it is not authorized by the CCMF to transmit transmit VSAT: VSAT capable of being used either for transmission only, or for transmission and reception up
42、link power density control: control of the e.i.r.p. and/or occupied bandwidth and/or other transmission parameters (e.g. FEC, modulation, symbol rate) of the transmitted signal in order to adjust the e.i.r.p. in a given measurement bandwidth NOTE: Uplink power density control may be used to respond
43、to uplink fade conditions. VSAT: complete VSAT equipment, comprising the outdoor unit and the indoor unit including the connection cable(s) between the units 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: CC Control Channel CCF Control Channel receptio
44、n Failure CCMF Centralized Control and Monitoring Functions CISPR Comit International Spcial des Perturbations Radiolectriques (International Special Committee on Radio Interference) CMF Control and Monitoring Function CCR Control Channel correctly Received CV Control Variable EIRP, e.i.r.p Equivale
45、nt Isotropically Radiated Power EN European Standard EUT Equipment Under Test FEC Forward Error Correction FS Fixed Service FSS Fixed Satellite Service GSO Geostationary Satellite Orbit HPA High Power Amplifier ITU International Telecommunications Union LNA Low Noise Amplifier LNB Low Noise Block LO
46、 Local Oscillator modem MOdulator/DEModulator PSTN Public Switched Telephone Network R “Checking“; “Stand-by“; and “In-service“. The four states of the VSAT are represented in figure 2 and are used in clause 4.2.6 for the specification of the class A CMF. In the “Out-of-service“, “Checking“ and “Sta
47、nd-by“ states the VSAT is not allowed to transmit. In the “In-service“ state the VSAT is allowed to transmit. 4.1.4.3 Class B CMF For VSATs implementing class B CMF, the four states are the following: “Non valid“; “Initial phase“; “Transmission disabled“; and “Transmission enabled“. The four states
48、of the VSAT are represented in figure 3 and are used in clause 4.2.7 for the specification of the class B CMF. 4.1.4.4 Radio states The VSAT “may transmit“ when all the conditions for transmission are satisfied (e.g. in a state where transmissions are permitted, no failure detected). The following r
49、adio states of the VSAT are defined: - “Emissions disabled“ when the VSAT must not transmit any carrier; - “Carrier-off“ when the VSAT may transmit and does not transmit any carrier; - “Carrier-on“ when the VSAT may transmit and transmits a carrier. Table 1a gives the only possible combinations of the VSAT states and radio states which shall apply, with some examples of associated events. When the VSAT transmits several carriers having different frequencies, a VSAT state machine as described above may be associated with each carrier or each set of carri
