VAF GV900W Manuel utilisateur
VAF Corp.
Data Communication
Tell: 44655121 Fax: 44658496
GV900W
Adjustable Band Selective Repeater
User Manual
Version 1.2
April 2007
VAF Corp.
Data Communication
Tell: 44655121 Fax: 44658496
TABLE OF CONTENT
1GENERAL............................................................................1
1.1 OVERVIEW .......................................................................... 1
1.2 SCOPE OF APPLICATION OF THE EQUIPMENT .................................... 3
1.3 FEATURES........................................................................... 3
1.4 TECHNICAL STANDARD ............................................................ 4
2TECHNICAL SPECIFICATION ..............................................5
2.1.1 Major Blocks diagram ......................................................
2.1.2 Theory of Operation ........................................................
2.2 MAJOR TECHNICAL PERFORMANCES.............................................. 6
3INSTALLATION...................................................................8
3.1 SYSTEM DESCRIPTION ............................................................. 8
3.1.1 Structure and Internal module........................................ 8
3.1.2 Bottom panel ............................................................. 10
3.1.3 Front panel ................................................................ 10
3.2 LCD SETTING .................................................................... 11
3.3 PREPARATIONS BEFORE INSTALLATION OF THE EQUIPMENT ................. 14
3.4 INSTALLATION AND OPENING OF EQUIPMENT ................................. 16
4MAINTENANCE .................................................................17
5CAUTIONS........................................................................18
APPENDIX ...............................................................................18
VAF Adjustable Band Selective Repeater
VAF Corp.
Data Communication
Tell:44655121 Fax: 44658496
1General
1.1 Overview
In GSM mobile communication system, limited by the coverage of
base station or by geographic environment, the transmission of signals
may be influenced in shadow or semi-shadow in some areas, generally
referred to as blind area or semi-blind area, bringing serious impact on
voice quality or even causing failure to normal communication. To solve
this problem, apart from adding more base stations, the deployment of
mobile communication repeater, characterized by quick expansion of
coverage and reduction of cost, shall be an ideal cost-effective choice of
high efficiency.
Wireless transmission repeater of GSM mobile communications is an
important tool to expand network coverage, enhance network capacity,
reduce network cost and realize network optimization. Wireless
transmission repeater of GSM mobile communications is meant to
amplify communication signal, extend network coverage, to improve
communication quality by amplifying some weak received signal and
expanding the signal coverage and to distribute traffic load in various
base stations with efficiency.
In the course of GSM network optimization, wireless transmission
repeater of GSM mobile communications offers a wide variety of
application, and has become an indispensable part of network system. In
some areas, such as satellite cities of some large cities, remote
residential areas, countries and towns or other blind areas or shadow
areas formed due to the natural or human obstacles (such as high
mountains, large buildings, tunnels or underground stores), optical fiber
transmission repeater of GSM mobile communications shall be the most
economical and reasonable solution to the effective coverage of these
VAF Adjustable Band Selective Repeater
VAF Corp.
Data Communication
Tell:44655121 Fax: 44658496
networks since these areas are demanding a greater coverage rather
than capacity.
Wireless transmission repeater of GSM mobile communications is
cheap with easy installation. It will greatly reduce the investment in
equipment and running cost to expand the network by optical fiber
transmission repeater. The outdoor cabinet design enables the
equipment to work under severe conditions in the open air and saves a
lot of operating cost by working without establishment of machine room,
air conditioner or large-scale power supply.
GV900W wireless transmission repeater integrated with wireless
communication technology and excellent performances, provides
operators with multiple solutions that can save the investment in
equipment and running maintenance cost without lowering the network
quality. As a supplement to base stations, the system can be easily
expanded to the blind areas that need covering to solve the problem of
coverage. By using GV900W GSM repeater of GSM mobile
communications, the surplus capacity of networks can be re-planned or
re-arranged so that the resources of networks will be used to their
maximum. The application of repeater shall attract more traffic load with
its short cycles, immediate returned profits, easy installation and savings
of network resources and expand the network coverage with low cost to
make up for the insufficient coverage of system base station. It is a good
solution to optimize network with wireless transmission repeater in
networks.
VAF Adjustable Band Selective Repeater
VAF Corp.
Data Communication
Tell:44655121 Fax: 44658496
1.2 Scope of Application of the Equipment
Applicable to airport, stations, highway, railway lines, subway, light
rail, tourist areas, large-scale industry and mining enterprises, satellite
cities of large cities, remote residential areas, countryside and blind
areas and shadow areas of GSM mobile communications.
GV900W repeater of GSM mobile communications mainly serves the
operators of GSM900MHz mobile communication
1.3 Features
(1) Use filter with high selectivity and low insertion-loss and
multi-grade filter technology to enhance the isolation between
uplink and downlink.
(2) No interference to the base station and other radio equipments
with low noise for the system, proper linearity and high power.
(3) Ensure normal working of the repeater under tough environment
with automatic level control (ALC) function.
(4) Modularized design facilitates assembly and maintenance.
(5) With local LCD or local PC, technicians can monitor, set, modify
the parameters of all the modules of repeaters and easily collect
equipment information.
(6) With wireless digital transmission and remote monitoring system,
operator can monitor and maintenance for network more easily.
(7) Equipped with perfect network management system (NMS) and
friendly operation interface, provide highly reliable operation and
failure treatment capability.
(8) With Hwatel NMS software, technicians can control repeaters in
the monitoring center or optimize parameters and upgrade
software according to the actual situation of network. It will
facilitate the monitoring of wireless transmission repeater of
mobile communications.
VAF Adjustable Band Selective Repeater
VAF Corp.
Data Communication
Tell:44655121 Fax: 44658496
When monitoring center has not been established, technicians can
monitor, set, modify the parameters of all the modules of repeaters and
easily collect equipment warning information via local PC. Once the
repeater fails, monitoring system can immediately send warning
information to designated mobile phone or cable phones at will.
When a monitoring center has been established, technicians can
control repeaters by OMT software in the monitoring center or optimize
parameters and upgrade software according to the actual situation of
network. It will facilitate the monitoring of wireless transmission
repeater of mobile communications.
1.4 Technical standard
1. GSM 05.05 “Wireless transmission and reception
2. GSM 03.30 “Wireless network planning”
3. GSM 11.20 “GSM base station (BBS) equipment specifications”
4. Requirements for repeater by National Radio Administration
Bureau
5. YD/T952-1998 “ Technical Requirements for 900M Repeater”
VAF Adjustable Band Selective Repeater
VAF Corp.
Data Communication
Tell:44655121 Fax: 44658496
2Technical specification
2.1.1Major blocks diagram
Components of repeater
The equipment consists of duplexers, uplink filters, downlink filters,
uplink band selective amplifying module, downlink band selective
amplifying module, monitoring elements and power elements.
2.1.2Theory of Operation
The downlink signal received by the donor antenna of the base station
shall be sent to a band selective filter via duplexer to be filtered and to
be amplified by the downlink band selective amplifier to a proper level.
The coverage antenna via a duplexer shall emit the downlink signal.
Similarly, for uplink, the signal received by the re-transmission antenna
shall have its level adjusted to a regulated level by a uplink band
selective amplifier after it is filtered. The donor antenna will emit it after
it is filtered and sent to the duplexer.
VAF Adjustable Band Selective Repeater
VAF Corp.
Data Communication
Tell:44655121 Fax: 44658496
2.2 Technical Specification
Item Up Link Down Link
Frequency range 890-915MHz 935-960MHz
Max. Output Power 33dBm 33/37/40/43 dBm
Max. Gain 90±3 dB 95±3 dB
Gain step 1 db
Gain adjust scope 31 dB
Band width Adjustable ( Each Step
25 K)
ALC f0<=2 dB f0<=2 dB
Passband Ripple No bigger 3 dB No bigger 3 dB
Frequency Error ±5X10-8 ±5X10-8
Gain Adjustment Range No less 30dB No less 30dB
-10 dB ±1.0dB
-20 dB ±1.0dB
Gain
Adjustmen
t Error -30 dB ±1.5dB
Gain Adjustment Step 1 dB / Step 1 dB / Step
Noise Figure <=4 dB <=4 dB
9KHz-1GHz: <=-36dBm/30KHz
Spurious emission 1GHz-12.75GHz: <=-30dBm/30KHz
In Work band <=-45dBc/30KHz <=-50dBc/30KHz
9KHz-1GHz:
<=-36dBm/30KHz
Third-order
inter-modu
lation
distortion
Out band (offset
from work band
edge 1MHZ) 1-12.75GHz:
<=-30dBm/30KHz
System Time Delay < 5 us
VSWR < 1.4:1
In/Output Impedance (Ω) 50W
In/Output Connector N-F
Working Voltage -48V DC or 220V AC
VAF Adjustable Band Selective Repeater
VAF Corp.
Data Communication
Tell:44655121 Fax: 44658496
Requirement for technical
safety
In accordance with relevant regulations in the
standard of GB4793-84
Requirement for
electromagnetic compatibility
In accordance with relevant regulations in the
standard of GB6833-87
Environmental Conditions
Temperature: -25 ˚c ~ 55˚c
Humidity: ≤95%
Air pressure: 70~ 106kPa
Dimension(W x D x H) 360 x 168 x 420mm
Management and control
LCD and keyboard on Front panel
Local computer through RS232
Remote management via GSM SMS channel
* detail tech parameter should reference to Test Report accomplished with its
repeater
VAF Adjustable Band Selective Repeater
VAF Corp.
Data Communication
Tell:44655121 Fax: 44658496
3Installation
3.1 System description
Fix part
Heat sink
Table des matières
