SIST ETS 300 638 E1:2003
(Main)Transmission and Multiplexing (TM); Digital Radio Relay Systems (DRRS); Fixed point-to-point radio link equipment for the transmission of digital signals and analogue video signal operating in the frequency bands 10 GHz and 14 GHz with 20 MHz alternate channel spacing
- Abstract
To specify parameters for digital and analogue radio relay systems in frequency bands with about 20 MHz channel spacing using an alternated polarisation channel arrangement.
- Status
- Published
- Publication Date
- 30-Nov-2003
- Withdrawal Date
- 30-Sep-2003
- Technical Committee
- RES - Radio equipment and systems
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
SIST ETS 300 638 E1:2003 is the Slovenian version of ETS 300 638 Edition 1 from ETSI. It specifies minimum technical requirements for fixed point-to-point Digital Radio Relay Systems (DRRS) in the 10 GHz and 14 GHz bands using 20 MHz alternate channel spacing. The standard is written for equipment makers, network planners, installers, and test teams who need to check compatibility, radio performance, and interface characteristics.
What does SIST ETS 300 638 E1:2003 specify?
SIST ETS 300 638 E1:2003 specifies minimum performance requirements for terrestrial fixed services radio communications equipment in the 10 GHz and 14 GHz bands. It focuses on compatibility between channels from different equipment sources on the same route, plus transmission quality for both digital and wideband analogue systems.
The document allows operation with an alternated polarisation channel arrangement and does not require radio terminals from different manufacturers to interwork at radio frequency. It also states that test procedures and test conditions are handled elsewhere, and that safety aspects are outside the ETSI mandate.
| Annex | What it covers |
|---|---|
| Annex A | Automatic Transmit Power Control (ATPC) |
| Annex B | Example channel plan for 20 MHz alternate channel spacing in the 10 GHz and 14 GHz bands |
What are the key requirements of SIST ETS 300 638 E1:2003?
SIST ETS 300 638 E1:2003 divides its requirements into general radio characteristics, digital system parameters, and wideband analogue system parameters. In practice, that means a supplier has to check frequency planning, output power, spectrum shape, receiver behaviour, and how the equipment fits into a radio network.
General requirements and installation conditions
- The equipment is intended for 10 GHz or 14 GHz operation with 20 MHz channel spacing, following ITU-R Recommendation 746. This matters because the channel plan drives compatibility with neighbouring links and national allocations.
- The minimum separation between the closest go and return channel centre frequencies is 30 MHz, and the transmitter-receiver duplex separation should be about half of the allocated band. This affects how a link is planned and how filters and branching arrangements are chosen.
- The standard anticipates both indoor and partially outdoor installations, including single RF channel links using a polarization duplexer and multi-channel links using RF filter branching units. This tells integrators which physical architectures the equipment must support.
- Environmental operation is tied to ETS 300 019 classes for weatherprotected and non-weatherprotected locations, and EMC conditions follow ETS 300 385. For procurement and testing, that means the installation site class has to be selected before compliance can be checked.
- The power supply must operate within the ranges of ETS 300 132, and the accessible receiver intermediate frequency, if used as a measurement point, shall be 70 MHz or 140 MHz. These points matter when verifying cabinet integration and measurements.
Digital systems
- Digital capacity covers 2 x 34 Mbit/s, 2 x 45 Mbit/s, and 2 x 51 Mbit/s, with n x 2 Mbit/s way-side traffic also considered for PDH systems. The document treats 2 x 34 Mbit/s and 2 x 45 Mbit/s as PDH systems and 2 x 51 Mbit/s as an SDH system.
- Baseband interfaces for PDH systems shall comply with ITU-T Recommendation G.703, and a required synchronous interface for 2 x 51 Mbit/s systems is a standard STM-1 interface. This is the practical handoff point to multiplexers and network equipment.
- Nominal transmitter output power at point C' is set by range, tolerance, and adjustment capability, and ATPC is an optional feature with limits given in Annex A. In practice, this defines how much link margin and power control the design can use.
- The RF spectrum must fit the specified masks, with separate treatment for digital modulating signals and for the innermost 14 GHz channels. This is the main control on adjacent-channel interference.
- Receiver performance is checked by BER versus received signal level, background BER, interference sensitivity, and distortion sensitivity. For users, this is the evidence that a link works at the intended signal level and remains stable under interference.
- Diversity operation is covered for systems that use space or frequency diversity, including delay compensation and BER penalties for combining. This is important where fading or path conditions justify a redundant receive path.
Wideband analogue systems
- Analogue operation uses up to 10 MHz video baseband bandwidth and may carry CW, low-frequency analogue, and digital subcarriers. That supports TV contribution and distribution applications.
- Video interfaces should follow ITU-T Recommendation J.61, audio interfaces should follow ITU-T Recommendation J.21 where applicable, and low-rate digital interfaces should follow G.703. These references define how the link connects to studio or transport equipment.
- The transmitter output power range is higher than for the digital case, and the radiated spectrum must fit the analogue mask in Figure 5. This is the control point for analogue coexistence and emission shaping.
- Frequency deviation is specified for video, audio subcarriers, digital subcarriers, and continuity pilots. In practice, that means the modulator settings have to be controlled so the signal stays within the expected broadcast style of transmission.
- Receiver threshold and interference sensitivity are defined through output signal-to-noise behaviour, with adjacent-channel and CW spurious interference checks. This helps users confirm that the analogue picture and sound remain usable under realistic interference conditions.
What terms does SIST ETS 300 638 E1:2003 define?
- ATPC (Automatic Transmit Power Control) - An optional function that adjusts transmitter power over a defined range to support planning and reduce interference.
- BER (Bit Error Rate) - The ratio used to describe digital transmission errors, and the document uses it to set receiver performance limits.
- C/I (Carrier to Interference Ratio) - A measure of wanted signal level versus interference, used to judge co-channel and adjacent-channel tolerance.
- RSL (Received Signal Level) - The measured receive signal strength at the reference point used for BER and threshold checks.
- TMN (Telecommunications Management Network) - The management interface environment used for SDH equipment supervision and control.
- SDH (Synchronous Digital Hierarchy) - The synchronous digital transport family used here for the 2 x 51 Mbit/s systems and STM-1 interfacing.
- PDH (Plesiochronous Digital Hierarchy) - The digital transport family used for the 2 x 34 Mbit/s and 2 x 45 Mbit/s systems and for way-side traffic.
- RF (Radio Frequency) - The carrier-frequency part of the system, used for transmitter, receiver, and spectrum requirements.
Who uses SIST ETS 300 638 E1:2003?
SIST ETS 300 638 E1:2003 is used by manufacturers of fixed radio relay equipment, especially those designing 10 GHz and 14 GHz point-to-point links. It is also used by system engineers who plan channel reuse, polarization arrangements, diversity, and power levels on a route.
Quality and test teams use it to verify spectrum masks, emissions, BER performance, receiver thresholds, and environmental class selection. Buyers, integrators, and operators use it when specifying equipment for medium-capacity local and regional networks, including digital TV links and analogue TV contribution or distribution paths.
Which standards are used with SIST ETS 300 638 E1:2003?
The standard relies on several named references:
- ETS 300 019 - gives environmental conditions and test severities for weatherprotected and non-weatherprotected equipment locations.
- ETS 300 132 - defines the power supply interface at the input to telecommunications equipment.
- ETS 300 385 - provides the EMC standard for digital fixed radio links and ancillary equipment.
- CCIR Recommendation 746 - gives the radio-frequency channel arrangement used for the 20 MHz plan in the 14 GHz band.
- CCIR Recommendation 750 and CCIR Recommendation 751 - support SDH radio-relay architectures, functional aspects, and performance requirements.
- ITU-T Recommendation G.703 and ITU-T Recommendation G.707 - define digital interface characteristics for PDH and SDH equipment.
- ITU-T Recommendations G.773 and G.784 - support TMN-related management interfaces for SDH systems.
- ITU-T Recommendations J.61 and J.21 - support broadcast video and audio transmission performance and interfaces.
- CCIR Recommendations 401-2, 403-3, and 405-1 - support continuity pilots, analogue IF interconnection, and pre-emphasis characteristics.
What does the SIST ETS 300 638 E1:2003 document contain?
SIST ETS 300 638 E1:2003 contains the system block diagram, frequency and channel arrangement requirements, and installation/environmental classes for indoor and outdoor use. It also includes specification tables for digital bit rates, climatic conditions, RF spectrum masks, spurious emissions, BER performance, interference sensitivity, and frequency stability.
For analogue systems, it adds baseband interface guidance, transmitter deviation limits, receiver threshold definitions, and interference checks. Annex A gives context for ATPC, and Annex B shows an example channel plan for the 20 MHz alternate spacing arrangement.
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Frequently Asked Questions
SIST ETS 300 638 E1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Transmission and Multiplexing (TM); Digital Radio Relay Systems (DRRS); Fixed point-to-point radio link equipment for the transmission of digital signals and analogue video signal operating in the frequency bands 10 GHz and 14 GHz with 20 MHz alternate channel spacing". This standard covers: To specify parameters for digital and analogue radio relay systems in frequency bands with about 20 MHz channel spacing using an alternated polarisation channel arrangement.
To specify parameters for digital and analogue radio relay systems in frequency bands with about 20 MHz channel spacing using an alternated polarisation channel arrangement.
SIST ETS 300 638 E1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.040.20 - Transmission systems; 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 300 638 E1:2003 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-december-2003
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RSUHPDWRþNDWRþND'556]DSUHQRVGLJLWDOQLKVLJQDORYLQDQDORJQHJDYLGHR
VLJQDODNLGHOXMHYIUHNYHQþQLKSDVRYLK*+]LQ*+]L]PHQRPD]0+]QLP
UD]PLNRPNDQDORY
Transmission and Multiplexing (TM); Digital Radio Relay Systems (DRRS); Fixed point-to
-point radio link equipment for the transmission of digital signals and analogue video
signal operating in the frequency bands 10 GHz and 14 GHz with 20 MHz alternate
channel spacing
Ta slovenski standard je istoveten z: ETS 300 638 Edition 1
ICS:
33.040.20 Prenosni sistem Transmission systems
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 300 638
TELECOMMUNICATION November 1996
STANDARD
Source: ETSI TC-TM Reference: DE/TM-04022
ICS: 33.060.30
Key words: Point-to-point, radio, transmission, DRRS, SDH
Transmission and Multiplexing (TM);
Digital Radio Relay Systems (DRRS);
Fixed point-to-point radio link equipment for the
transmission of digital signals and analogue video signal
operating in the frequency bands 10 GHz and 14 GHz
with 20 MHz alternate channel spacing
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 1996. All rights reserved.
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ETS 300 638: November 1996
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 300 638: November 1996
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Abbreviations and symbols .8
3.1 Abbreviations .8
3.2 Symbols .9
4 General characteristics (digital and analogue).9
4.1 Frequency bands and channel arrangements .9
4.1.1 Alternate channel spacing .9
4.1.2 Transmit/receive minimum separation .9
4.1.3 Transmit/receive duplex frequency separation .9
4.2 Compatibility requirements between systems.9
4.3 Types of installation .10
4.3.1 Environmental conditions .10
4.3.1.1 Equipment within weatherprotected locations .10
4.3.1.2 Equipment for non-weatherprotected locations.10
4.3.2 ElectroMagnetic Compatibility (EMC).11
4.4 System block diagram .11
4.5 TMN interface .11
4.6 Power supply.11
4.7 Receiver Intermediate frequency.12
5 Parameters for digital systems.12
5.1 Transmission capacity .12
5.2 Applications.12
5.3 Baseband parameters .12
5.3.1 Plesiochronous interfaces .12
5.3.2 SDH baseband interface .12
5.4 Transmitter characteristics .12
5.4.1 Transmitter power range .12
5.4.2 Automatic Transmit Power Control (ATPC) .12
5.4.3 RF spectrum.13
5.4.3.1 RF spectrum mask .13
5.4.3.2 Spectral line at the symbol rate .14
5.4.4 Spurious emissions .14
5.4.4.1 Spurious emissions-external .15
5.4.4.2 Spurious emissions-internal .15
5.4.5 Radio frequency tolerance .15
5.5 Receiver characteristics.16
5.5.1 Input level range.16
5.5.2 Spurious emissions .17
5.5.2.1 Spurious emissions external.17
5.5.2.2 Spurious emissions-internal .18
5.6 System characteristics without diversity .18
5.6.1 BER performance.18
5.6.2 Equipment background BER.18
5.6.3 Interference sensitivity.18
5.6.4 Distortion sensitivity.19
5.7 System characteristics with diversity .19
5.7.1 Differential delay compensation .19
5.7.2 BER performance.19
6 Parameters for wideband analogue systems .19
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ETS 300 638: November 1996
6.1 Transmit/receive capacity . 19
6.1.1 Applications . 20
6.2 Baseband parameters. 20
6.2.1 Video Interfaces. 20
6.2.2 Audio interface (if applicable) . 20
6.2.3 Digital interface (if applicable). 20
6.2.4 IF interface (if applicable) . 20
6.2.5 Transmission performance. 20
6.3 Transmitter characteristics. 20
6.3.1 Transmitter power range . 20
6.3.2 Transmitter output power tolerance. 20
6.3.3 Radiated spectrum. 21
6.3.3.1 Spectrum masks . 21
6.3.3.2 Frequency deviation. 21
6.3.4 Spurious emissions. 22
6.3.4.1 Spurious emissions-external. 22
6.3.4.2 Spurious emissions-internal. 22
6.3.5 Radio frequency tolerance. 23
6.4 Receiver characteristics . 23
6.4.1 Input level range . 23
6.4.2 Spurious emissions. 23
6.4.2.1 Spurious emissions-external. 23
6.4.2.2 Spurious emissions-internal. 23
6.4.3 Noise figure. 23
6.5 System performance. 24
6.5.1 Receiver threshold. 24
6.5.2 Interference sensitivity . 24
Annex A (informative): Automatic Transmit Power Control (ATPC). 25
Annex B (informative): Example of a channel plan for 20 MHz alternate channel spacing in the
10 GHz and 14 GHz frequency band. 26
History. 27
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ETS 300 638: November 1996
Foreword
This European Telecommunication Standard (ETS) has been produced by the Transmission and
Multiplexing (TM) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS contains the minimum technical requirements to ensure compatibility of products and
conformance with radio regulations across ETSI member states. Radio terminals from different
manufacturers are not required to interwork at radio frequency (i.e. no common air interface). However,
terminals may be combined with other manufacturers equipment on a Radio Frequency (RF) branching
network for operation on different polarizations.
This ETS defines the requirements of radio terminal and radio relay equipment and associated interfaces.
The requirements for multiplex, network management and antenna/feeder equipment may be addressed
elsewhere.
Transposition dates
Date of adoption of this ETS: 25 October 1996
Date of latest announcement of this ETS (doa): 28 February 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 August 1997
Date of withdrawal of any conflicting National Standard (dow): 31 August 1997
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ETS 300 638: November 1996
Blank page
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ETS 300 638: November 1996
1 Scope
This European Telecommunication Standard (ETS) covers the minimum performance requirements for
terrestrial fixed services radio communications equipment, as given below, in bands in the frequency
ranges 10 GHz and 14 GHz using 20 MHz channel spacing.
This ETS is applicable in those countries where the frequency plan in these bands is based on a 20 MHz
spacing; it does not prevent the development of future ETSs for equipment operated in these bands using
a different channel plan.
This ETS does not cover aspects related to test procedures and test conditions which are in the scope of
another ETS under study in TM4.
The parameters specified fall into two categories:
a) those required to provide compatibility between channels from different sources of equipment on
the same route, connected either to separate antennas, or to separate polarizations of the same
antenna. This category also includes parameters providing compatibility with the existing radio-relay
network;
b) parameters defining the transmission quality of the proposed systems.
The standardization includes the following specifications:
- transmitter and receiver characteristics;
- baseband and RF interface characteristics;
- diversity system characteristics.
As regards Synchronous Digital Hierarchy (SDH) systems, the Section Overhead (SOH) processing is
covered in CCIR Recommendation 750 [8].
Safety aspects are outside the mandate ot ETSI and they will not be considered in this ETS.
2 Normative references
This ETS incorporates by dated or undated reference, 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] ETS 300 019 (1994): "Equipment Engineering (EE); Environmental conditions
and environmental tests for telecommunications equipment".
[2] ETS 300 132: "Equipment Engineering (EE); Power supply interface at the input
to telecommunications equipment".
[3] ETS 300 385 (1995): "Radio Equipment and Systems (RES); " ElectroMagnetic
Compatibility (EMC) Standard for digital fixed radio links and ancillary equipment
with data rates at around 2 Mbit/s and above".
[4] CCIR Recommendation 401-2: "Frequencies and deviations of continuity pilots
for frequency modulation radio-relay systems for television and telephony".
[5] CCIR Recommendation 403-3: "Intermediate frequency characteristics for the
interconnection of analogue radio-relay systems".
[6] CCIR Recommendation 405-1: "Pre-emphasis characteristics for frequency
modulation radio-relay systems for television".
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ETS 300 638: November 1996
[7] CCIR Recommendation 746: "Radio - Frequency channel arrangements for
radio-relay systems - Annex 7: Description of the radio-frequency channel
arrangement in the frequency band 14,25-14,5 GHz using a 20 MHz channel
spacing".
[8] CCIR Recommendation 750: "Architectures and functional aspects of
radio-relay systems for SDH-based networks".
[9] CCIR Recommendation 751: "Transmission characteristics and performance
requirements of radio-relay systems for SDH-based networks".
[10] ITU-T Recommendation J.61: "Transmission performance of television circuits
designed for use in international connections".
[11] ITU-T Recommendation J.21: "Performance characteristics of 15 kHz-type
sound-programme circuits - Circuits for high quality monophonic and
stereophonic transmissions".
[12] CCITT Recommendation G.703: "Physical/electrical characteristics of
hierarchical digital interfaces".
[13] ITU-T Recommendation G.707: "Network node interface for the Synchronous
Digital Hierarchy".
[14] ITU-T Recommendation G.773: "Protocol suites for Q-interfaces for
management of transmission systems".
[15] ITU-T Recommendation G.784: "Synchronous Digital Hierarchy (SDH)
management".
3 Abbreviations and symbols
3.1 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
ATPC Automatic Transmitter Power Control
BB BaseBand
BER Bit Error Rate
C/I Carrier to Interference Ratio
CW Continuous Wave
DRRS Digital Radio-Relay System
EMC ElectroMagnetic Compatibility
IF Intermediate Frequency
IF/RF Intermediate Frequency/Radio Frequency
LO Local Oscillator
PDH Plesiochronous Digital Hierarchy
PRBS Pseudo-Random Binary Sequence
RF Radio Frequency
RSL Received Signal Level
RX Receive (Receiver)
SDH Synchronous Digital Hierarchy
S/I Signal to Interference Ratio
SRL Spectrum Reference Level
STM-1 Synchronous Transport Module-level 1
TMN Telecommunications Management Network
TX Transmit (Transmitter)
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ETS 300 638: November 1996
3.2 Symbols
For the purposes of this ETS, the following symbols apply:
dB decibel
dBm decibel relative to 1 mW
GHz Gigahertz
km kilometre
Mbit/s Mega-bit per second
MHz Megahertz
m/s metres per second
ppm parts per million
ns nanosecond
W/m² Watts per square metre
4 General characteristics (digital and analogue)
4.1 Frequency bands and channel arrangements
The systems shall be required to operate in the frequency bands 10 GHz or 14 GHz using a channel
spacing of 20 MHz according to ITU-R Recommendation 746 [7].
NOTE: A typical application of ITU-R Recommendation 746 [7] is shown in annex B.
4.1.1 Alternate channel spacing
See subclause 4.2, a).
Table 1a: Digital systems
Minimum bit rate (Mbit/s) 2 x 34 2 x 45 2 x 51
(note) (note)
Channel spacing (MHz) 20 20 20
NOTE: In order to achieve good efficiency a minimum gross
bit rate of about 90 Mb/s is envisaged; therefore
n x 2 Mbit/s way side traffic in Plesiochronous Digital
Hierarchy (PDH) systems is considered.
Table 1b: Analogue systems
Video baseband (MHz)
≤ 10
Channel spacing (MHz) 20
4.1.2 Transmit/receive minimum separation
The minimum separation between the centre frequencies of the closest go and return radio channels shall
be 30 MHz.
4.1.3 Transmit/receive duplex frequency separation
The transmitter receiver duplex frequency separation should be approximately half of the allocated
frequency band. An example of a national channel plan in use is given in annex B for information.
4.2 Compatibility requirements between systems
a) Systems operating on common hops will normally use the same double polarized antenna;
b) there should be no requirement to operate transmitting equipment from one manufacturer with
receiving equipment from another;
Page 10
ETS 300 638: November 1996
c) there should be no requirement to multiplex equipment from different manufacturers on the same
polarization of the same antenna.
4.3 Types of installation
Both indoor and partially outdoor installations are considered.
Single RF channel links connected to different polarizations of the same antenna via a polarization
duplexer (mainly in a partially outdoor configuration) as well as multi RF channel links with classical RF
filter channel branching units are anticipated.
4.3.1 Environmental conditions
The equipment shall be required to meet either the environmental conditions set out in ETS 300 019,
part 1-3 and part 1-4 [1], which define weatherprotected and non-weatherprotected locations, classes and
test severities, or one of the conditions listed in subclause 4.3.1.2.
4.3.1.1 Equipment within weatherprotected locations
The most important climatic parameters for the five classes defined are given in table 2.
Table 2: Climatic parameters (weatherprotected)
Climatic class 3.1 3.2 3.3 3.4 3.5
High air temperature (°C) +40 +45 +55 +70 +40
Low air temperature (°C) +5 -5 -25 -40 -40
High relative humidity (%) 85 95 100 100 100
Low relative humidity (%) 5 5 10 10 10
Air movement (m/s) 5 5 5 5 5
Solar radiation (W/m²) 700 700 1x 1x -
For equipment designed for stationary use in weatherprotected locations (indoor installation), only classes
3.1 or 3.2 shall apply (see ETS 300 019, part 1-3 [1]).
4.3.1.2 Equipment for non-weatherprotected locations
This type of equipment is generally described as "outdoor" equipment. Class 4.1 or extended class 4.1E
parameters should be applied. Class 4.1 applies to many European countries and class 4.1E applies to
them all. The most important parameters values are given in table 3.
Table 3: Climatic parameters (non-weatherprotected)
Climatic class 4.1 4.1E
+40 +45
High air temperature (°C)
-33 -45
Low air temperature (°C)
High relative humidity (%) 100 100
Low relative humidity (%) 15 8
Air movement (m/s) +50 +50
Solar radiation (W/m²) 1x 1x
It should be noted that radio cabinets supplied with a system will be "weather protected" including full
protection against precipitation and wind. Climatic classes 3.3, 3.4 and 3.5 (subclause 4.3.1.1) may,
therefore, also be applicable to equipment in outdoor locations.
The operation of the outdoor equipment in accordance with class 4.1E shall not be mandatory for all users
of this ETS.
Some users of this ETS may also decide to apply one of the alternative parameters given in table 4.
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ETS 300 638: November 1996
Table 4: Alternative climatic parameters
Climatic class 4.1 4.1E
High air temperature (°C) +40 +50
Low air temperature (°C) -20 -30
High relative humidity (%) 90 90
Low relative humidity (%) 5 5
Air movement (m/s) +50 +50
Solar radiation (W/m²) 1x 1x
4.3.2 ElectroMagnetic Compatibility (EMC)
Digital systems shall operate under the conditions specified in the relevant EMC Standard for digital fixed
links and ancillary equipment ETS 300 385 [3].
4.4 System block diagram
Branching
A' B' C'
Z' E' D'
Modulator
Feeder
Transmitter Network
RF Tx Filter
(note 1)
Branching
D C A
B E Z
Network
Receiver Demodulator
RF Rx Filter
Feeder
(note 1)
MAIN RECEIVER PATH (note 2) (note 2)
Branching
Dd Cd Bd Ad Ed
Network
Feeder
RF Rx Filter Receiver
Demodulator
(note 1)
DIVERSITY RECEIVER PATH
NOTE 1: No filtering included.
NOTE 2: Connection at RF, Intermediate Frequency (IF) or baseband.
Figure 1: System block diagram
4.5 TMN interface
For SDH equipment a Telecommunications Management Network (TMN) interface required by a user
should follow ETSI, TM2 and TM3 recommendations in accordance with ITU-T Recommendations
G.784 [15] and G.773 [14] and CCIR Recommendations 750 [8] and 751 [9]. For as Plesiochronous
Digital Hierarchy (PDH) equipment the TMN interface is under study.
4.6 Power supply
The equipment shall operate from one or more of the supply voltages within the ranges specified in
ETS 300 132 [2].
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ETS 300 638: November 1996
4.7 Receiver Intermediate frequency
The intermediate frequency, if accessible as a measurement point, shall be 70 MHz or 140 MHz.
5 Parameters for digital systems
5.1 Transmission capacity
Bit rates: 2 x 34 Mbit/s, 2 x 45 Mbit/s, 2 x 51 Mbit/s (sub-STM-1). Way-side traffic of n x 2 Mbit/s is also
considered for PDH systems.
For the transport of compressed digital video signals multiple lower bit rate signals (e.g. n x 8 Mb/s) are
envisaged as payloads, leading to similar gross transmission bit rates.
In the following, the 2 x 34 Mbit/s and 2 x 45 Mbit/s systems will be indicated as PDH systems and the
2 x 51 Mbit/s system as an SDH system.
5.2 Applications
Medium capacity point-to-point local and regional networks, digital T
...