SIST ETS 300 721 E1:2005
(Main)Satellite Earth Stations and Systems (SES); Mobile Earth Stations (MES) providing Low Bit Rate Data Communications (LBRDC) using LEO satellites operating below 1 GHz
- Abstract
Standardization of Mobile Earth Stations in order to limit interference to other services.
- Status
- Published
- Publication Date
- 31-Jan-2005
- Technical Committee
- RES - Radio equipment and systems
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Feb-2005
- Due Date
- 01-Feb-2005
- Completion Date
- 01-Feb-2005
SIST ETS 300 721 E1:2005 is the Slovenian adoption of ETS 300 721 Edition 1, an ETSI European Telecommunication Standard for Satellite Earth Stations and Systems (SES). It specifies radio-frequency emission limits, control and monitoring functions, and test methods for Mobile Earth Stations (MES) that provide Low Bit Rate Data Communications (LBRDC) using Low Earth Orbiting (LEO) satellites operating below 1 GHz, so that their operation limits interference to other radiocommunications services.
What does SIST ETS 300 721 E1:2005 specify?
SIST ETS 300 721 E1:2005 standardizes the characteristics of MESs with transmit and receive capabilities for LEO Mobile Satellite Service (MSS) networks. Its focus is practical: keep unwanted emissions under control and require terminal behaviour that prevents unintended transmissions.
The scope covers MES operation in the listed MSS and Land Mobile-Satellite Service frequency bands around 137 MHz, 148 to 150.05 MHz, 235 to 322 MHz, and 335.4 to 400.05 MHz. It also notes that some networks use short-burst, low-duty-cycle transmission and modulation methods such as Direct Sequence - Spread Spectrum Multiple Access (DS-SSMA) and Frequency Division Multiple Access (FDMA) with Dynamic Channel Activity Assignment (DCAA).
The document is organized into a short set of clauses on reporting, RF limits, control and monitoring, shock and vibration, and network control facilities, followed by two normative annexes.
| Annex | What it covers |
|---|---|
| Annex A | Environmental and test conditions |
| Annex B | Test procedures |
What are the key requirements of SIST ETS 300 721 E1:2005?
SIST ETS 300 721 E1:2005 is mainly a verification standard. It tells manufacturers and test houses what to measure, how to measure it, and what terminal behaviour must be shown to avoid harmful interference.
Clause 4 - Test report: The report shall include the nominated bandwidth, the antenna gain pattern, the test results, and all operating parameters and conditions. In practice, this means the evidence package must capture both the radio setup and the terminal state used for compliance testing.
Clause 5.1 - Unwanted emissions outside the operating bands: MESs must limit emissions outside the specified uplink bands, with a carrier-off limit of 33 dBpW in any 100 kHz. The clause uses different limits by frequency range and measurement bandwidth. In practice, the terminal must be tested as it actually transmits, not only as a bench transmitter.
Clause 5.2 - Unwanted emissions within the operating bands but outside the nominated bandwidth: In-band unwanted emissions are limited to 34 dBpW in any 4 kHz when carrier-off, and to band- and mode-dependent limits when carrier-on. This matters because the terminal must stay clean even inside its allocated service band, not only outside it.
Clause 5.3 - EIRP emission density in the nominated bandwidth: The Equivalent Isotropically Radiated Power (EIRP) density in any 4 kHz band is limited to 130 dBpW for FDMA and 106 dBpW for DS-SSMA. The clause allows conducted or radiated verification depending on the antenna arrangement. In practice, the transmitter output and antenna behaviour both matter.
Clause 5.4 - Protection of the radio astronomy service: The MES shall be able to suppress transmissions after a disable command, or another indication that protection is needed, and remain suppressed until it receives an enable command. This is the mechanism that protects sensitive adjacent radio astronomy bands.
Clause 6 - MES Control and Monitoring Functions (CMFs): The MES shall monitor processor operation, transmit frequency generation, power-on state, and control-channel reception. If a processor fault is detected, transmissions shall be suppressed within 1 second; if the transmit frequency generation sub-system fails for more than 5 seconds of cumulative transmission, transmission shall stop; after power-on, no transmission shall occur until a control channel is received; and loss of control channel for more than 30 seconds shall also force carrier-off. The terminal shall also keep its unique identification in non-volatile memory and respond to enable, disable, and identification commands from the Network Control Facilities (NCF).
Clause 7 - Shock and vibration: For Vehicle mounted MES (VMES), and if required by the manufacturer, the in-band unwanted emission limits shall still be met after the shock and vibration conditions in Annex A. In practice, this confirms that vehicle installation and mechanical stress must not push the transmitter out of specification.
What terms does SIST ETS 300 721 E1:2005 define?
SIST ETS 300 721 E1:2005 defines the terminal types and operating states used throughout the standard.
- BMES (Based MES): A MES intended for fixed installation and powered by dc or ac mains.
- PMES (Portable MES): A MES intended to be portable, powered by a stand-alone battery, and generally self-contained.
- VMES (Vehicle mounted MES): A MES intended to be installed on a vehicle.
- CMF (Control and Monitoring Function): A function in the MES that helps prevent unintended transmissions and supports control by the network.
- NCF (Network Control Facilities): The network-side control facilities referenced by ETS 300 722.
- Nominated bandwidth: The manufacturer-declared transmission bandwidth that includes the useful signal and carrier stability.
- Carrier-off state: The MES state in which it is not transmitting.
- Carrier-on state: The MES state in which it is transmitting, continuously or non-continuously.
Who uses SIST ETS 300 721 E1:2005?
SIST ETS 300 721 E1:2005 is used by people who design, test, or buy MES equipment for LEO satellite networks.
- Terminal manufacturers use it to design BMES, PMES and VMES products that meet RF limits and control logic requirements.
- Test laboratories use Annex B to set up conducted and radiated emission measurements and to demonstrate CMF behaviour.
- Compliance and quality teams use Clause 4 and the RF clauses to build the test report and check that the terminal meets the specified limits.
- Network control engineers use Clause 6 together with ETS 300 722 to implement enable, disable, identification, and control-channel behaviour.
- Satellite communications buyers and integrators use it to judge whether a terminal is intended for LBRDC operation under 1 GHz and whether it includes the functions needed for safe network operation.
What changed in SIST ETS 300 721 E1:2005 from the previous edition?
SIST ETS 300 721 E1:2005 is identical to ETS 300 721 Edition 1, the first edition from June 1997.
Which standards are used with SIST ETS 300 721 E1:2005?
SIST ETS 300 721 E1:2005 cites three normative references that support its technical checks.
- ITU Radio Regulations - provide the radio regulatory framework used for spectrum and service context.
- ETS 300 722 - specifies Network Control Facilities for MES providing LBRDC using LEO satellites operating below 1 GHz; this standard depends on it for NCF behaviour.
- CISPR Publication No 16 (1993) - provides specification for radio disturbance and immunity measuring apparatus and methods, used for the RF measurement approach in Annex B.
What does the SIST ETS 300 721 E1:2005 document contain?
SIST ETS 300 721 E1:2005 contains a test-report requirement, several RF emission limits, and a set of MES control and monitoring requirements. It also includes a clause on maintaining RF performance after shock and vibration for VMES, and a clause that points to NCFs for MES networks.
Annex A gives the environmental and test conditions, including wind loading, vibration, mechanical shock, induced acceleration, and rate of turn, with applicability split between VMES, PMES, and BMES. Annex B gives the test procedures for wanted and unwanted emissions, including equipment under test configuration, special test equipment, calibrated reference antennas or coaxial paths, antenna positioning, polarization, and conducted measurements into a 50 ohm load.
The annex procedures are written for practical verification work. They tell the laboratory how to place the terminal, what power state to use, and how to measure emissions so the results can be compared with the limits in Clause 5.
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Frequently Asked Questions
SIST ETS 300 721 E1:2005 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Satellite Earth Stations and Systems (SES); Mobile Earth Stations (MES) providing Low Bit Rate Data Communications (LBRDC) using LEO satellites operating below 1 GHz". This standard covers: Standardization of Mobile Earth Stations in order to limit interference to other services.
Standardization of Mobile Earth Stations in order to limit interference to other services.
SIST ETS 300 721 E1:2005 is classified under the following ICS (International Classification for Standards) categories: 33.060.30 - Radio relay and fixed satellite communications systems. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST ETS 300 721 E1:2005 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2005
Satelitske zemeljske postaje in sistemi (SES) - Mobilne zemeljske postaje (MES), ki
zagotavljajo podatkovne komunikacije z nizkimi bitnimi hitrostmi (LBRDC),
uporabljajo satelite na nizki zemeljski orbiti (LEO) in obratujejo pod 1 GHz
Satellite Earth Stations and Systems (SES); Mobile Earth Stations (MES) providing Low
Bit Rate Data Communications (LBRDC) using LEO satellites operating below 1 GHz
Ta slovenski standard je istoveten z: ETS 300 721 Edition 1
ICS:
33.060.30 Radiorelejni in fiksni satelitski Radio relay and fixed satellite
komunikacijski sistemi communications systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN ETS 300 721
TELECOMMUNICATION June 1997
STANDARD
Source: ETSI TC-SES Reference: DE/SES-05017
ICS: 33.020
Key words: Satellite, mobile, earth station, MES, MSS, LEO
Satellite Earth Stations and Systems (SES);
MES providing Low Bit Rate Data Communications (LBRDC)
using LEO satellites operating below 1 GHz
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.fr
Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16
Copyright Notification: No 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 1997. All rights reserved.
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ETS 300 721: June 1997
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.
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ETS 300 721: June 1997
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .8
4 Test Report.9
5 Radio Frequency (RF).9
5.1 Unwanted emission outside the bands 148 to 150,05 MHz, 235 to 322 MHz, 335,4 to
399,9 MHz and 399,9 to 400,05 MHz .9
5.2 Maximum unwanted emission within the bands 148 to 150,05 MHz, 235 to 322 MHz,
335,4 to 399,9 MHz and 399,9 to 400,05 MHz .11
5.3 Maximum EIRP emission density in the nominated bandwidth .11
5.4 Protection of the radio astronomy service from emissions produced by the MES in the
bands 150,05 to 153 MHz, 322 to 328,6 MHz and 406,1 to 410 MHz .12
6 MES Control and Monitoring Functions (CMFs).12
6.1 Monitoring functions.12
6.1.1 Processor monitoring .12
6.1.2 Transmit frequency generation sub-system .13
6.2 Power-on.13
6.3 Network control reception and authorization.13
6.3.1 Control channel(s) reception .13
6.3.2 Network control commands.14
7 Compliance with RF specifications under conditions of shock and vibration.14
8 NCFs for MES networks.15
Annex A (normative): Environmental and test conditions.16
A.1 Environmental conditions .16
A.2 Test conditions .16
Annex B (normative): Test procedures .17
B.1 Introduction.17
B.2 Equipment Under Test (EUT).17
B.3 Special Test Equipment (STE).17
B.4 Radiated measurement.17
B.4.1 Measuring apparatus .17
B.4.2 Test set-up.18
B.4.3 Measuring procedure.18
B.5 Conducted measurement.18
B.5.1 Measuring apparatus .18
B.5.2 Test set-up.19
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ETS 300 721: June 1997
B.5.3 Measuring procedure .19
History. 20
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ETS 300 721: June 1997
Foreword
This European Telecommunication Standard (ETS) has been produced by the Satellite Earth Stations and
Systems (SES) Technical Committee of the European Telecommunications Standards Institute (ETSI).
Transposition dates
Date of adoption: 20 June 1997
Date of latest announcement of this ETS (doa): 30 September 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 March 1998
Date of withdrawal of any conflicting National Standard (dow): 31 March 1998
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ETS 300 721: June 1997
Blank page
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ETS 300 721: June 1997
1 Scope
This European Telecommunication Standard (ETS) provides specifications for the standardization of the
characteristics of Mobile Earth Stations (MESs) with both transmit and receive capabilities in order to limit
interference to radiocommunications services.
The Low Earth Orbiting (LEO) satellite networks referred to in this ETS operate under the Mobile Satellite
Service (MSS). The MESs operate as part of a LEO satellite network providing Low Bit Rate Data
Communications (LBRDC).
The frequency bands under which the MESs operate should be within the following bands:
MES MES
Transmit frequencies Receive frequencies
and Service allocations and Service allocations
148 MHz to 149,9 MHz Mobile-Satellite 137 MHz to Mobile-Satellite Service
Service 137,025 MHz
149,9 MHz to 150,05 MHz Land Mobile-Satellite 137,025 MHz to Mobile-Satellite Service
Service 137,175 MHz
235 MHz to 322 MHz Mobile-Satellite 137,175 MHz to Mobile-Satellite Service
Service 137,825 MHz
335,4 MHz to 399,9 MHz Mobile-Satellite 137,825 MHz to Mobile-Satellite Service
Service 138 MHz
399,9 MHz to 400,05 MHz Land Mobile-Satellite 235 MHz to Mobile-Satellite Service
Service 322 MHz
335,4 MHz to Mobile-Satellite Service
399,9 MHz
400,15 MHz to Mobile-Satellite Service
401 MHz
Some LEO satellite networks provide Low Bit Rate Data Communications (LBRDC) using short burst, low
duty cycle MES transmissions in order to reduce interference with existing users. The interference levels
can also be decreased by modulation techniques: Direct Sequence - Spread Spectrum Multiple Access
(DS-SSMA) or Frequency Division Multiple Access (FDMA) using Dynamic Channel Activity Assignment
(DCAA) as described in ITU-R Recommendations M 1039 and M 1087.
These MESs generally have the following characteristics:
- the MESs could be either a Based MES (BMES), a Vehicle mounted MES (VMES) or a Portable
MES (PMES);
- the MES could consist of a number of modules including suitable interfaces to the user.
The main specifications are contained in two categories related to:
- unwanted emissions limitation: to protect terrestrial and space radiocommunications services,
and the radio astronomy services from harmful interference;
- MES control and monitoring functions: to specify a minimum set of Control and Monitoring
Functions (CMFs) to be implemented on each MES in order to minimize the probability that they
originate unwanted transmissions that may give rise to harmful interference to other systems.
2 Normative references
This ETS incorporates, by dated or undated references, provisions from other publications. These
normative references are cited at the appropriate places in the text, and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] ITU Radio Regulations.
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ETS 300 721: June 1997
[2] ETS 300 722: "Satellite Earth Stations and Systems (SES); Network Control Facilities for MES
providing Low Bit Rate Data Communications (LBRDC) using LEO satellites operating below
1 GHz".
[3] CISPR Publication No 16 (1993): "Specification for radio disturbance and immunity measuring
apparatus and methods".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
BMES: A MES intended to be installed in a fixed location, and which is powered either by dc or ac mains.
carrier-off state: A MES is in this state when it is not transmitting a signal, i.e. not in the carrier-on state.
carrier-on state: A MES is in this state when it is transmitting a signal in a continuous or non-continuous
mode.
control channel: A Control Channel may be either a command to a particular MES or a signal from the
satellite containing control information to appropriately enable or disable transmissions from a MES.
Internally Mounted Equipment (IME) and Externally Mounted Equipment (EME): The EMEs are the
modules to be externally mounted as stated by the manufacturer or indicated in the user documentation,
the IMEs are the remaining modules intended to be internally mounted Where different specifications
apply to IME and EME, this is noted in the relevant text.
nominated bandwidth: The bandwidth of the MES radio frequency transmission is nominated by the
terminal manufacturer. The nominated bandwidth is wide enough to encompass all spectral elements of
the transmission which have a level greater than the specified unwanted emissions limits. The nominated
bandwidth is wide enough to take account of the transmit carrier frequency stability. The nominated
bandwidth is within the MSS transmit frequency band within which the MES operates.
PMES: A MES intended to be portable , and which is powered by a stand alone battery, and generally
intended to be self-contained and free standing. A PMES would normally consist of a single module, but
may consist of several interconnected modules. In some cases different specifications apply to PMES and
this is noted in the relevant text.
unwanted emissions: Unwanted emissions are those falling outside the nominated bandwidth.
VMES: A MES intended to be installed on a vehicle. A VMES may consist of one or several
interconnected modules as follows:
NOTE: For FDMA / DCAA systems the Nominated Bandwidth does not exceed 25 kHz.
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
BMES Based MES
CMF Control and Monitoring Function
DCAA Dynamic Channel Activity Assignment
DS-SSMA Direct Sequence Spread Spectrum Multiple Access
EIRP Equivalent Isotropically Radiated Power
EME Externally Mounted Equipment
EUT Equipment Under Test
FDMA Frequency Division Multiple Access
IME Internally Mounted Equipment
MES Mobile Earth Station
MSS Mobile Satellite Service
NCF Network Control Facilities
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ETS 300 721: June 1997
PMES Portable MES
RF Radio Frequency
rms root mean square
STE Special Test Equipment
VMES Vehicle mounted MES
4 Test Report
The test report shall contain:
- the value of the nominated bandwidth, declared by the manufacturer;
- the antenna gain pattern;
- the results of the tests;
- all parameters and operational conditions.
5 Radio Frequency (RF)
Whenever a change of limit between adjacent frequency bands occurs in this subclause, the lower of the
two limits shall apply at the transition frequency.
5.1 Unwanted emission outside the bands 148 to 150,05 MHz, 235 to 322 MHz, 335,4 to
399,9 MHz and 399,9 to 400,05 MHz
Purpose:
Protection of other terrestrial services, space radiocommunications services and the radio astronomy
services from emissions caused by MESs outside the bands 148 to 150,05 MHz, 235 to 322 MHz, 335,4
to 399,9 MHz and 399,9 to 400,05 MHz.
Specification:
With carrier off the MES unwanted emission shall not exceed 33 dBpW, in any 100 kHz.
The unwanted emissions from the MES outside the uplink bands 148 - 150,05 MHz, 235 to 322 MHz,
335,4 to 399,9 MHz and 399,9 to 400,05 MHz, within which the MES is designed to operate, shall not
exceed the limits shown in the following tables.
Table 1: Unwanted emissions outside the operational band 148 to 150,05 MHz
Maximum EIRP density
Frequency (dBpW) Measurement
(MHz) DS-SSMA FDMA bandwidth
0,1 to 146 54 54 100 kHz
146 to 147,5 70 54 100 kHz
147,5 to 148 70 - 105 (note) 54 100 kHz
150,05 to 151,15 70 54 100 kHz
151,15 to 1 000 54 54 100 kHz
1 000 to 12 750 60 60 1 MHz
NOTE: Linearly interpolated in dBpW vs. frequency
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ETS 300 721: June 1997
Table 2: Unwanted emissions outside the operational bands
235 to 322 MHz, 335,5 to 399,9 MHz and 399,9 to 400,05 MHz
Frequency Maximum EIRP density Measuring bandwidth
(MHz) (dBpW)
0,1 to 30 54 100 kHz
30 to 399,9 54 100 kHz
400,05 to 1 000 54 100 kHz
1 000 to 12 750 60 1 MHz
Verification:
By measurement of unwanted emissions generated by an operating MES.
All RF tests in this subclause shall be carried out at ambient environmental conditions of the test
laboratory and for a nominal power supply voltage.
All tests with carrier on shall be undertaken with the transmitter operating at full power and with the
maximum transmit burst rate where applicable.
To enable the performance tests to be carried out, the use of Special Test Equipment (STE), supplied by
the manufacturer, may be necessary. Since this test equipment will be specific for the particular system, it
is not possible to provide detailed specifications in the ETS.
However, the following baseline is provided:
- if the MES requires to receive a modulated carrier from the satellite in order to transmit, then
special test arrangements are required to simulate the satellite signal, thus enabling the MES to
transmit allowing measurement of transmission parameters;
- any specification of these special test arrangements which may have direct or indirect effects on
any requirement or recommendation of this ETS shall be clearly stated by the manufacturer.
Test procedure:
The full system shall be tested according to the test procedure given in annex B.
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ETS 300 721: June 1997
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