The information contained herein is proprietary to Shyam Telecom Limited.
Unauthorized access, copy and replication are prohibited. This document must
not be copied in whole or part by any means or it shall not be disclosed o
divulged to any third Party without the prior written consent of Shyam Telecom
Limited.
October 2007
Proprietary Information
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1. Document History
Document
Number
DB5R
Document
Name
Dual
Document
date
October
2007
AuthorEdited
by
Approved by Revision
Band
Repeater
Revision Revised Section Date/Sign
Intentionally Left Blank
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2. Disclaimer
Every attempt has been made to make this material complete, accurate, and
up-to-date. Users are cautioned, however, that Shyam Telecom Limited
reserves the right to make changes without notice and shall not be
responsible for any damages including consequential, caused by reliance of
the contents presented, including, but not limited to, typographical,
arithmetical, or listing errors.
Product name(s) referenced in this document may be trademarks or
registered trademarks of their respective companies, and are hereby
acknowledged.
In areas with unstable power grids (mains) all repeaters must be installed with
a voltage regulator ensuring a constant voltage level at the repeater power
input. A maximum voltage deviation should remain within the input range to
the repeaters for warranty purposes.
All antennas must be installed with lighting protection. Damage to internal
modules, as a result of lightning is not covered in the warranty.
3. Safety Instructions and Warnings
3.1. Personnel Safety
Before installing or replacing any equipment, the entire manual should be
read and understood. The user needs to supply the appropriate AC power to
the Repeater. Incorrect AC power settings can damage the repeater and may
cause injury to the user.
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Throughout this manual, there are "Caution" warnings, "Caution" calls
attention to a procedure or practice, which, if ignored, may result in injury or
damage to the system or system component or even the user. Do not
perform any procedure preceded by a "Caution" until the described
conditions are fully understood and met.
3.2. Equipment Safety
When installing, replacing or using this product, observe all safety
precautions during handling and operation. Failure to comply with the
following general safety precautions and with specific precautions described
elsewhere in this manual violates the safety standards of the design,
manufacture, and intended use of this product. Shyam Telecom Limited
assumes no liability for the customer's failure to comply with these
precautions. This entire manual should be read and understood before
operating or maintaining the repeater system.
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CAUTION
Calls attention to a procedure or practice which, if not followed, may result in
personal injury, damage to the system or damage to individual components. Do
not perform any procedure preceded by a
CAUTION until described conditions are fully understood and met.
WARNING! This equipment complies with FCC & IC radiation exposure limits
set forth for an uncontrolled environment. This transmitter must not be colocated or operating in conjunction with any other antenna or transmitter.
The unit with server antenna must be installed to provide minimum 110 cm
separation distance between the server antenna and the body of user or near
by person. The donor antenna used for this transmitter must be fixedmounted on outdoor permanent structures with a separation distance of at
least 1.5 meters from all persons during normal operation.
The RF electric performance of the repeater conforms to FCC requirement of
the inter modulation and spurious emission. It avoids interference problems.
3.3. Electrostatic Sensitivity
CAUTION
ESD = ELECTROSTATIC DISCHARGE SENSITIVE DEVICE
Observe electrostatic precautionary procedures.
Semiconductor transmitters and receivers provide highly reliable performance
when operated in conformity with the intentions of their design. However, a
semiconductor may be damaged by an electrostatic charge inadvertently
imposed by careless handling.
Static electricity can be conducted to the semiconductor chip from the centre
pin of the RF input connector, and through the AC connector pins. When
unpacking and otherwise handling the Repeater, follow ESD precautionary
procedures including the use of grounded wrist straps, grounded workbench
surfaces, and grounded floor mats.
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4. Introduction
4.1. Purpose
The purpose of this document is to describe the electrical and mechanical
specifications, operation and maintenance of the DB5R Dual Band Repeater.
4.2. Scope
This document is the product description of the Shyam DB5R Dual Band
EGSM
ETSI
GSM
LAC
LED
LNA
LO
MS
MSC
NMS
PCN
PCS
PSU
RF
RMS
RSSI
RTC
TACS
TDMA
UL (Uplink)
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Automatic Gain Control
Automatic Level Control
Automatic Power Control
Broadcast Control Channel
Base Transceiver Station
Band Selective
Coded Division Multiple Access
Configuration & Monitoring Console software
Combiner Unit
Channel Selective
Digital Communication System
Downlink signal (from base station via repeater to
mobile station)
Extended Global System for Mobile Communication
European Telecommunications Standard Institute
Global System for Mobile communication
Location Area Code of the BTS site
Light Emitting Diode
Low Noise Amplifier
Local Oscillator
Mobile Station
Mobile Switching Center
Network Management System
Personal Communication Network
Personal Communication System
Power Supply Unit
Radio Frequency
Remote Management System
Received Signal Strength Indication
Real Time Clock
Total Access Communication System
Time Division Multiple Access
Uplink signal direction (from mobile station via
repeater to base station)
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4.4. References
[1] ETS 300 086.
Radio Equipment and Systems Land mobile service Technical
characteristics and test conditions for radio equipment with an internal or
external RF connector intended primarily for analogue speech.
[2] ETS 300 609-4.
Digital cellular telecommunications system (phase 2): Base Station
Systems (BSS) equipment specification: Part 4: Repeaters.
[3] ETS 300 342-3
Radio Equipment and Systems (RES); Electro-Magnetic Compatibility
(EMC) for European Digital Cellular Telecommunications systems. Base
Station Radio and ancillary equipment and Repeaters meeting phase 2
GSM requirements.
4.5. General
Mobile Communications Systems are planned as cellular systems and each
cell of the base station is required to provide RF coverage over a certain
geographical area as per defined RF power levels. Due to the RF propagation
properties, even using high radiated RF powers or complicated antenna
systems, there are zones within the coverage area where the RF signal
strength from base station remains inadequate for establishing the desired
connectivity to mobile users.
Repeaters traditionally are deployed in the Mobile Communication network to
fill in the “Dead Zones” caused by blocking of signals by geographic
topologies such as mountains, valleys, dense foliage, high rising urban
landscapes and other man-made structures. The distance from the base
station also adversely affects the RF signal strength. The user views
repeaters as a means to extend base station coverage so as to reduce the
number of base stations and thereby accelerate network availability.
Repeater systems are installed after meticulous planning between BTSs and
the mobile users to provide RF coverage in the shadowed regions. Repeater
systems are available for different applications and ultimate choice shall
depend on some of the factors mentioned below:
• Area to be provided with coverage.
• Indoor/outdoor coverage.
• Availability of BTSs in the vicinity.
• Antenna isolation to be achieved.
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5. Functional Description Of DB5R Dual Band Repeater
5.1. General Description
The DB5R Dual Band Repeater System is designed to provide outdoor
coverage and can handle signals in up to five sub bands with 3+2
configuration (maximum) in two of the service bands, used around the World
by various service operators. It provides highly selective amplification in the
pre-set frequency bands. The details of operating service frequency bands
are given below:
S.NO. Service Band DL Frequency (MHz) UL Frequency (MHz)
1. SMR 800
2. Cellular
3. SMR 900
4. EGSM
5. GSM 900
6. DCS
7. PCS
8. UMTS
851-866 806-821
869-894 824-849
935-941 896-902
925-960 880-915
935-960 890-915
1805-1880 1710-1785
1930-1990 1850-1910
2110-2170 1920-1980
The Customer is requested to refer to the packing list giving the details of
frequency band set & the bandwidths of different sub bands equipped in the
repeater (FCC & IC applications only apply for Cellular & PCS band operations).
• The DB5R repeater is designed to provide optimal coverage, the area
covered shall primarily depend on RF power radiated, manmade
structures in the area (high rise buildings), the geographical topologies
and availability of reflecting surfaces.
• The ultimate performance & coverage shall depend on the obstructions
blocking/absorbing of the RF signals by various objects between the
Server antenna of RF repeater and the mobile users.
• The repeater is specifically designed for the Operators who are
allocated frequency spectrum in different service bands and noncontiguous sub bands are specified.
• The repeater adopts duplex mode and bi-directional amplification for
U/L & D/L signals between the base station and mobile users.
• It receives signals from the BTS through a DONOR antenna (highly
directional outdoor antenna) and distributes the signals to mobile users
after amplification through a set of SERVER antennas (omni/patch
directional) system in the D/L.
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• In the U/L, the signals from the mobile users are picked up by
SERVER antenna and retransmitted to the BTS after amplification.
• The repeater finds applications in tunnels, highways, large size
airports, and open market areas etc. where traffic requirement is high.
• The system can be incorporated with optional Remote Management
System (RMS) which can be used for configuration and monitoring the
status of the link. It helps not only speedy maintenance but remote
configuration also through wireless modem.
The repeater consists of the following modules/units:
• LNA
• Converter modules
• Power amplifiers
• Power supply module
• Duplexer filters for transmit/receive directions
• Supervisory module
• Diplexer Unit for segregating bands
• A metallic case houses the repeater. Arrangement is made for heat
dissipation especially for amplifiers, which generate more heat. The
choice of suitable metal as the case material gives a lightweight design
with good heat conduction and waterproof protection. The housing
conforms to IP65 (NEMA 5) standards.
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BTS
RF cable from
donor antenna
Power supply
cable
Donor
Antenna
DB5R
RF cable from
server
Server
Antenna
Area to be served
Figure 1: DB5R Repeater-Different Constituents
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