Andrew Wireless Innovations Group MRx01B Users manual
User’s manual for Repeater MRx01B Power
User’s manual for
band or channel selective Repeater
MRx01B Power
M0079A1A.doc Id.-No. 151775 Page 1 10-March-00
User’s manual for Repeater MRx01B Power
Copyright MIKOM, Buchdorf 2000
All rights reserved.
No parts of this publication may be
reproduced, stored in a retrieval system, transmitted in any form or by
any means, electronical, mechanical photocopying,
recording or otherwise, without prior written permission of the
publisher.
M0079A1A.doc Id.-No. 151775 Page 2 10-March-00
User’s manual for Repeater MRx01B Power
Table of Contents
LIST OF FIGURES AND TABLES 6
LIST OF UNIT SPECIFIC ABBREVIATIONS 7
CONTENTS OF DELIVERY 7
HEALTH AND SAFETY WARNING 8
PREAMBLE 9
1 INTRODUCTION 11
1.1 Intended purpose 11
1.2 About the MRx01B Power 11
1.3 Modular design 11
1.4 Applications 12
2 FUNCTIONAL DESCRIPTION 13
2.1 General 13
2.2 Conversion modules 14
2.3 Mother board 14
2.4 Control module SM 2009 ( Rev. 07 and higher ) 16
2.5 Duplexer 20
2.6 Active combiner 21
2.7 Measuring aids 21
2.8 Feedforward amplifier 22
2.9 Power supply 22
3 FUNCTIONS AND FEATURES 24
3.1 Band and channel selectivity 24
M0079A1A.doc Id.-No. 151775 Page 3 10-March-00
User’s manual for Repeater MRx01B Power
3.2 Gain setting 24
3.3 ALC 25
3.4 CFO 25
3.5 BITE and alarms 25
3.5.1 Handling of alarms 27
3.5.2 Status report 28
3.5.3 Severity levels 28
4 OPTIONAL EQUIPMENT 29
4.1 VSWR module 29
4.2 External alarms 29
4.3 Modem 30
4.4 External RF output 31
4.5 Battery backup module 32
5 INSTALLATION 33
5.1 Mechanical installation 34
5.2 Electrical installation 36
5.2.1 Grounding 36
5.2.2 Power connection 37
5.2.3 Connection of the antenna cables 37
6 SETTING TO WORK 39
6.1 Preparation 39
6.2 Setting of operational parameters 39
6.2.1 Manual settings by means of rotary switches 40
6.2.2 Setting of the attenuation 40
6.2.3 Settings via personal computer as terminal 42
6.2.4 Settings via modem 44
7 TROUBLE SHOOTING 45
7.1 Error indication 45
7.2 Alarm monitoring with the STATUS HIST command 45
M0079A1A.doc Id.-No. 151775 Page 4 10-March-00
User’s manual for Repeater MRx01B Power
7.3 Power supply 46
7.4 General remarks 46
8 MAINTENANCE 47
8.1 General 47
8.2 Replacement of the fuses (mains) 47
8.3 Replacement of the power supply fuse 48
8.4 Replacement of the mains cable 48
8.5 Replacement of the RAM / RTC battery 49
8.6 Replacement of the duplexers 50
8.7 Replacement of conversion modules 50
8.8 Replacement of the control module SM 2009 53
8.9 Replacement of power supplies 54
8.10 Replacement of active combiner modules 55
8.11 Replacement of feedforward amplifier 55
9 APPENDICES 58
9.1 Repeater specifications 58
9.2 Spare parts lists for MRx01B Power 68
9.2.1 Spare parts list for MR301B Power 68
9.2.2 Spare parts list for MR401B Power 70
9.2.3 Spare parts list for MR701B Power 71
9.2.4 Spare parts list for MR801B Power and MR801Bi Power 73
9.3 Installation drawing of the Repeater 75
9.4 Top view of the Repeater (left side , exemplary configuration) 76
9.5 Top view of the Repeater (right side, exemplary configuration) 77
9.6 One channel configuration – cabling and block diagram 78
10 INDEX 80
M0079A1A.doc Id.-No. 151775 Page 5 10-March-00
User’s manual for Repeater MRx01B Power
LIST OF FIGURES AND TABLES
table 1-1 List of international sales offices ..............................................................................10
figure 2-1 Block diagram of MRx01B Power..........................................................................13
figure 2-2 Top view of a conversion module...........................................................................14
figure 2-3 Top view of a mother board .................................................................................... 15
figure 2-4 Configuration of the control module ( Rev.07 and higher )....................................18
figure 2-5 Configuration of the DIP-Switches.........................................................................19
figure 2-6 Top view of the duplexers....................................................................................... 20
figure 2-7 Top view of the active combiner module................................................................21
figure 2-8 Top view of the feedforward amplifier ...................................................................22
figure 2-9 Mounting position of power supplies......................................................................23
figure 2-10 ON / OFF position of external switch...................................................................23
figure 3-1 Position of rotary switches ...................................................................................... 24
table 3-2 List of all available alarms........................................................................................26
figure 4-1 Clamps for external alarms......................................................................................29
figure 4-2 Modem kit ............................................................................................................... 31
figure 4-3 Position of external RF output.................................................................................31
figure 4-4 Mounting position of batteries ................................................................................32
figure 5-1 System description ..................................................................................................33
figure 5-2 Top view and clearance distance.............................................................................34
figure 5-3 Wall mounting brackets...........................................................................................35
figure 5-4 Grounding kit ..........................................................................................................36
figure 5-5 Screw terminal......................................................................................................... 37
figure 5-6 Connector panel layout............................................................................................ 38
table 6-1 LED indication.......................................................................................................... 39
figure 6-2 Position of the DIP-Switch 1 and 2 and RAM/RTC battery...................................40
figure 6-3 Position of the rotary switches ................................................................................41
figure 6-4 Rotary switches and label........................................................................................41
table 6-5 DIP-switch configuration.......................................................................................... 42
table 6-6 List of AT commands................................................................................................44
figure 8-1 Position of power supply fuse ................................................................................. 48
figure 8-2 External filter at iDEN module................................................................................51
figure 8-3 Top view of a conversion module...........................................................................51
figure 8-4 Position of hex-coded rotary switches.....................................................................52
table 8-5 Address of synthesizer ..............................................................................................52
table 8-6 Adress of synthesizer, conversion modules .............................................................. 52
figure 8-7 Position of hex-coded rotary switches.....................................................................52
figure 8-8 Position of control module......................................................................................53
figure 8-9 Power supply...........................................................................................................54
figure 8-10 Position of special-nut M4 ....................................................................................54
figure 8-11 Position of counter sunk screws on active combiner.............................................55
figure 8-12 Position of feedforward amplifier reset board....................................................... 56
figure 8-13 Position of feedforward amplifiers........................................................................57
figure 9-1 Installation drawing of the Repeater........................................................................75
figure 9-2 Top view of the Repeater (left side, exemplary configuration)...............................76
figure 9-3 Top view of the Repeater (right side, exemplary configuration) ............................ 77
figure 9-4 Cabling of one channel Repeater............................................................................. 78
figure 9-5 Block diagram of one channel Repeater.................................................................. 79
M0079A1A.doc Id.-No. 151775 Page 6 10-March-00
User’s manual for Repeater MRx01B Power
LIST OF UNIT SPECIFIC ABBREVIATIONS
ALC Automatic Level Control
BCCH Broadcast Control Channel
BITE Built In Test Equipment
BTS Base Transceiver Station
DL Downlink
ETS European Telecommunication Standard
Id.-No. Ident Number
I²C-Bus Inter Integrated Circuit Bus (Philips)
LMT Local Maintenance Timeout
MR MIKOM Repeater
OMC Operation and Maintenance Centre
PABX Private Automatic Branch Exchange
PCMCIA Personal Computer Modem Communication International Association
PSTN Public Switched Telephone Network
Rev Revision
RF Radio Frequency
RLP Radio Link Protocol
RSSI Receive Signal Strength Indication
RTC Real Time Clock
SDA Serial Data Line of I²C-Bus
SCL Serial Clock Line of I²C-Bus
UL Uplink
UPS Uninterruptable Power Supply
VSWR Voltage Standing Wave Ratio
CONTENTS OF DELIVERY
Qty 1 Repeater MRx01B Power
Qty 1 User’s manual for Repeater MRx01B Power
Qty 1 Software manual
Qty 1 Set of test protocols consisting of an electrical acceptance test protocol
and a safety test protocol applying to the power supply
Qty 1 Spare parts kit
Qty 1 Wall mounting kit
M0079A1A.doc Id.-No. 151775 Page 7 10-March-00
User’s manual for Repeater MRx01B Power
HEALTH AND SAFETY WARNINGS
F Note:
F Note:
F Note:
F Note:
F Note:
The electrical installation has to be performed in accordance with the safety
regulations of the local authorities. Due to safety reasons the electrical
installation must be performed by qualified personnel. The cover of this unit
should not be opened while power is applied. Subsequent installation,
commissioning and maintenance activities that require the unit to be
powered with the cover open shall only be carried out by suitably qualified
personnel.
The grounding of the Unit has to be performed by all means. A grounding
bolt is provided at the cabinet in order to connect the earth bonding cable.
The Unit is heavy-weight. Make sure that a suitable mounting surface is
used. Only adequate manpower is allowed to handle the system.
ESD precautions have to be observed! Before maintenance work use the
available grounding system to connect ESD protection measures.
Due to power dissipation the Repeater may heat up the air volume inside the
cabinet and reach a very high temperature. Therefore the Repeater must be
mounted in the vertical plane to a wall or a mast without additional
enclosure to provide sufficient ventilation. Between the housing and the wall
a minimum distance must be kept in order to provide air circulation.
M0079A1A.doc Id.-No. 151775 Page 8 10-March-00
User’s manual for Repeater MRx01B Power
PREAMBLE
The MRx01B Power manual ( Ordering number Id.-No. 151775 ) includes the following
parts:
Chapter 1: Introduction
Chapter 2: Functional description
Chapter 3: Functions and features
Chapter 4: Optional equipment
Chapter 5: Installation
Chapter 6: Setting to work
Chapter 7: Trouble shooting
Chapter 8: Maintenance
Chapter 9: Appendices
Chapter 10: Index
Any intervention has to be performed by authorized persons only. If you need technical
assistance with the Repeater MRx01B Power approach your local sales office or Mikom
directly.
MIKOM GmbH
Industriering 10
86675 Buchdorf
Germany
Tel: +49 (0) 9099 6 90
Fax: +49 (0) 9099 69 31
email: sales@mikom.com
http://www.mikom.com
Under consideration of all references given in this manual, the Repeater should be taken into
service without any complications and should operate trouble-free for a long time.
M0079A1A.doc Id.-No. 151775 Page 9 10-March-00
User’s manual for Repeater MRx01B Power
LIST OF INTERNATIONAL SALES OFFICES
Allen Telecom Inc. Allen Telecom Pty Ltd Forem France
30500 Bruce Industrial Parkway 6 Stuart Street Z.I. des Ebisoires
Cleveland, Ohio 44 139-3996 Padstow NSW 2211 78370 Plaisir
USA Australia France
Phone: +1 ( 440 ) 349-8400 Phone: +61 ( 2 ) 9774-4200 Phone: +33 ( 1 )30-79-15-30
FAX: +1 ( 440 ) 349-8407 FAX: +61 ( 2 ) 9774-4500 FAX: +33 ( 1 ) 30-55-55-37
FOREM S.p.A. AT Singapore AT China
Via Archimede N. 22/24 80 Marine Parade Road CITIC Building, # 11-04
20041, Agrate Brianza #19-1 Parkway Parade 19 Jianguomenwai Avenue
Milan Singapore 449269 Beijing
Italy China 100004
Phone: +39 ( 039 )605-41 Phone: +65 ( 345 ) 8022 Phone: +86 ( 10 ) 6508-3088
FAX: +39 ( 039 ) 605-4477 FAX: +65 ( 345 ) 8033 FAX: +86 ( 10 )6508-3066
AT Canada FOREM UK AT Hong Kong
Unit D
1815 Ironstone Manor, # 12
Pickering, Ontario L1W 3W9
Canada
Phone: +1 ( 905 ) 839-3474 Phone: +44 ( 1635 ) 569-695 Phone: +852 ( 2389 ) 1844
FAX: +1 ( 905 ) 839-4663 FAX: +44 ( 1635 ) 569-463 FAX: +852 ( 2389 ) 4864
AT India
B-256 Ground Floor.
Chittaranjan Park
New Delhi 110019
Phone: +91 ( 11 ) 696-3918
FAX: +91 ( 11 ) 652-1648
Castle Industrial Park
Pear Tree Lane
Newbury, Berkshire
U.K. RG 14 2EZ
MIKOM Switzerland
Tiergartenweg 1
4710 Balzthal
Switzerland
Phone: +41 ( 6238 ) 61260
FAX: +41 ( 6238 ) 61261
1603 Remington Center,
23 Hung To road,
Kwun Tong, Kowloon
Hong Kong
MIKOM Austria
Himbergerstr. 7/3/1
2320Schwechat
Austria
Phone: +43 ( 1 ) 706 - 3999
FAX: +43 ( 1 ) 706 - 39999
table 1-1 List of international sales offices
M0079A1A.doc Id.-No. 151775 Page 10 10-March-00
User’s manual for Repeater MRx01B Power
1 Introduction
1.1 Intended purpose
Cellular telephone systems transmit signals in two directions between base stations and
mobile telephones within the signal coverage area.
If weak signal transmissions occur within the coverage area because of indoor applications,
topological conditions or distance from the transmitter, a Repeater is used to extend
transmission range. In the downlink path the Repeater picks up the signal from a donor
antenna of an existing cell, amplifies and re-transmits it into the desired dark spot. In the
uplink direction the Repeater receives signals from mobile stations present in its coverage
area and re-transmits them to the corresponding base station.
1.2 About the MRx01B Power
This repeater bi-directionally amplifies signals between multiple mobiles and a single base
station in the frequency band. It is employed where poor topological conditions cause weak
field strengths. It can provide highly selective amplification of band segments or channels in
the frequency band.
MRx01B Power modules can be combined with other repeater modules in order to create a
multi-band repeater system. Modules operating in PCS1900, GSM1800, GSM900, or
AMPS800 bands are available. When different modules are combined a common antenna and
control interface are available.
The MRx01B Power can be set-up locally or remotely. A PCMCIA slot for modem operation
is an available option. The repeater has a large number of functions that can be monitored and
changed by the operators via a terminal emulation program or the MIKOM OMC software
platform. An easy to understand and simple to learn communication language is available to
help the operator query status reports from the repeater or to change settings.
1.3 Modular design
The MRx01B repeater’s modular design provides the flexibility in addressing present and
future system needs. Each repeater is custom configured. The main unit includes equipment
common to all systems ( cabinet, control module, power supply, mother board ). To this main
unit hardware modules are added as needed. In addition to different duplexers, a wide range
of conversion modules can be selected depending on the used network system.
M0079A1A.doc Id.-No. 151775 Page 11 10-March-00
User’s manual for Repeater MRx01B Power
1.4 Applications
The ability to customise the equipment in this way makes it possible to target the MRx01B to
specific needs. For example, the following are some of the application options available with
the MRx01B.
• Channel selective or band selective
• CDMA or TDMA
• iDEN and analog networks
• GSM900 or GSM1800
• PCS1900
M0079A1A.doc Id.-No. 151775 Page 12 10-March-00
User’s manual for Repeater MRx01B Power
2 Functional description
The Repeater MRx01B Power can be equipped from one to four bands or channels depending
on the used technology.
The following block diagram shall illustrate the configuration of the system.
*: one physical module contains UL and DL
**: with more than two modules, the amplifiers are included; both are in one housing
figure 2-1 Block diagram of MRx01B Power
2.1 General
The Repeater consists of two amplifier chains, which are connected antiparallel. The
receive path of one direction is connected to the transmit path of the other direction by a
frequency separation unit, in the following denominated as a duplexer, which combines
both signals to an antenna (see chapter 2.5).
After the duplexer the signals get to a pre-amplifier and afterwards to a conversion
module (see chapter 2.2). Then the signals are combined by the active combiner (see
chapter 2.6) and afterwards amplified by the feedforward amplifier (see chapter 2.8),
which provides the required output power.
M0079A1A.doc Id.-No. 151775 Page 13 10-March-00
User’s manual for Repeater MRx01B Power
In the feedforward amplifier a power detection measures the output power and controls
the gain. This is called Automatic Level Control (ALC) and keeps intermodulations
below an adjustable value. Finally, the signals are fed to the antenna.
2.2 Conversion modules
The task of the conversion modules is to amplify the
receive signals and to convert them into an intermediate
frequency. The signals, then, proceed a filter stage
comprising of highly selective filters, and run through a
digital controllable attenuator. The attenuation can be
set in steps of 2 dB, locally or remotely. By using the
same synthesizer frequency, that was used to convert the
signals down to intermediate frequency, the
intermediate frequency is mixed up to the original
frequency.
The synthesizer is controlled via an I²C-Bus. In case of a
breakdown in mains, gain or frequency data are nonvolatile stored in an EEPROM on board.
The yellow label on the top shows the current ALC and
CFO values related to the module.
See figure 2-2 Top view of a conversion module for an
exemplary channel or band module.
figure 2-2 Top view of a conversion module
2.3 Mother board
The function of the mother board is the communication between the conversion modules and
the control module via the I²C-Bus.
In the three and four channel configuration there is a mother board implemented on the lefthand side and on the right-hand side of the Repeater.
In the one and two channel configuration of the Repeater there is only one mother board
mounted on the right-hand side (see figure 9-2 and figure 9-3).
Mother boards are located underneath the conversion modules.
M0079A1A.doc Id.-No. 151775 Page 14 10-March-00
User’s manual for Repeater MRx01B Power
figure 2-3 Top view of a mother board
M0079A1A.doc Id.-No. 151775 Page 15 10-March-00
User’s manual for Repeater MRx01B Power
2.4 Control module SM 2009 ( Rev. 07 and higher )
The control module SM 2009 is a DOS compatible micro computer. The whole
communication between the operator and the Repeater can be done via the control module. By
using either the RS232 interface in connection with a modem card and a mobile the Repeater
can be controlled remotely or locally by using a VT100 terminal, i.e. a PC emulating the
VT100 terminal.
Frequency and gain, power down of RF stages and ALC can be controlled and status
messages can be received remotely. In case a modem or a mobile is connected, automatic
alarm messages can be received by the operator.
The data transfer between the control module SM 2009 and the mother board is realized by
the I²C-Bus system.
The I²C-Bus concept was developed by Philips for the serial connection of integrated circuits
within one device. Two wires, SDA - serial data and SCL - serial clock, carry information
between the devices connected to the bus. Each device is recognized by a unique address and
can operate either as transmitter or receiver. The MRx01B Power I²C-Bus concept is working
with a bit rate of 1.5 kbit/s.
All MRx01B Power configuration parameters are stored in an EEPROM on the control
module if a power supply failure occurs.
M0079A1A.doc Id.-No. 151775 Page 16 10-March-00
User’s manual for Repeater MRx01B Power
Functional description:
• Second RS-232 port ( Not working yet, do not use it ) ( 01)
• Configurable for MR or MOR (Master Unit) by DIP-Switches (02 )
• External alarms or PSTN modem selection by DIP-Switches
( = replacement of the external alarm cable) ( 03 )
• 8 additional TTL inputs ( opto-coupled ) ) ( 04 ) ( Not supported by software )
• 8 additional TTL outputs (O.C. or VCC by 1K-pull-up resistor) ( 05 ) ( Not supported by
software )
• Connector for external temperature sensor ( 06 ) ( Not supported by software )
• Integrated Battery Backup Dummy Board incl. M1 Reset ( Id.-No. 143750 ).
The switch is required to activate the battery backup. If a battery backup module is used,
the switch must be set to ‘BBU’ position, otherwise there is no backup possible ( 07 ).
• Soldering point for the PC/MODEM-switch in a Master Unit ( 08 )
• Reset jumper ( 09 )
• Fixed location for labels for control module ID (Mikom), repeater software (Mikom),
board serial number, modem-driver licence ( 10 )
• RS232 interface for the connection of a PC or terminal ( local mode ) ( 11 ).
M0079A1A.doc Id.-No. 151775 Page 17 10-March-00
User’s manual for Repeater MRx01B Power
010302
09
10
050406
05
08
bus
interf.
LEDs
L1, L2
LED L3
07
ON = No BBU
OFF = BBU in
Mode
switch
+12 Vdc
for the
modem
I2C-
Debug
figure 2-4 Configuration of the control module ( Rev.07 and higher )
M0079A1A.doc Id.-No. 151775 Page 18 10-March-00
User’s manual for Repeater MRx01B Power
SW802
ON OFF
Ext. Alarm 1 PSTN (a)
4
Ext. Alarm 2 PSTN (b)
3
Ext. Alarm 3 PSTN (c)
2
Ext. Alarm 4 PSTN (d)
1
SW503
MOR MR
8
MOR MR
7
MOR MR
6
MOR MR
5
4
3
2
1
ON OFF
MR MOR
MR MOR
MR MOR
MR MOR
SW501
ON OFF
SW Download ---
4
3
Modem mode Local mode
2
Manual mode SW mode
1
--- ---
DIP-Switches are at position OFF
figure 2-5 Configuration of the DIP-Switches
SW504
ON OFF
VCC O.C.
8
VCC O.C.
7
VCC O.C.
6
VCC O.C.
5
VCC O.C.
4
VCC O.C.
3
VCC O.C.
2
M0079A1A.doc Id.-No. 151775 Page 19 10-March-00
User’s manual for Repeater MRx01B Power
2.5 Duplexer
The task of the duplexer is to isolate uplink from downlink, i.e. isolate transmit path from
receive path. The pass bandwidth of the duplexer is the entire width of the uplink band and
the downlink band.
Duplexer with connector to mobile side
30 dB
coupler
20 dB
coupler
30 dB
coupler
Duplexer with connector to BTS side
figure 2-6 Top view of the duplexers
M0079A1A.doc Id.-No. 151775 Page 20 10-March-00
User’s manual for Repeater MRx01B Power
2.6 Active combiner
After passing through the conversion modules, the signals will be combined by the active
combiner module in the UL and in the DL path. The active combiner will be followed by the
feedforward amplifier.
figure 2-7 Top view of the active combiner module
2.7 Measuring aids
With built-in RF probes test signals can be applied or detected. The probes provide a coupling
factor of 30 dB respectivly 20 dB. Each duplexer (uplink and downlink) is equipped with one
30 dB coupler, the UL Input duplexer additionally with a 20 dB coupler for a modem or
mobile (see chapter 4 Optional equipment). This facilitates measurements under all
operational conditions, while an antenna or a dummy load may be connected.
The position of the couplers on the duplexers is shown in figure 2-6 Top view of the
duplexers.
M0079A1A.doc Id.-No. 151775 Page 21 10-March-00
User’s manual for Repeater MRx01B Power
2.8 Feedforward amplifier
The feedforward amplifier is the final stage which enables high output power as well as a high
ICP3. One amplifier has to be installed for the uplink and one for the downlink.
figure 2-8 Top view of the feedforward amplifier
2.9 Power supply
For the MRx01B Power power four power supplies are necessary.
Power supplies are available with different mains power. See list below for available power
supplies.
• 115 VAC ± 15% / 40 - 65 Hz
• 230 VAC ± 15% / 40 - 65 Hz
• 185 - 320 VAC / 40 - 65 Hz
• 24 VDC
• 42 to 60 VDC
• 80 to 130 VDC
M0079A1A.doc Id.-No. 151775 Page 22 10-March-00
User’s manual for Repeater MRx01B Power
The following figure shows the mounting position of the power supplies in the
MRx01B Power cabinet.
figure 2-9 Mounting position of power supplies
Power supplies can be equipped with a power socket, protected with two fuses. Each power
supply can be switched on or off by means of an external switch. The modules of the Repeater
are voltage free if all power supplies are switched off. The power socket, however, is still
provided with mains power.
F Note: The service connecter must not be used for anything else but
service devices with low power consumption, e.g. a Laptop.
See figure 2-10 ON / OFF position of external switch.
figure 2-10 ON / OFF position of external switch
F Note: To switch the whole Repeater voltage free, you have to remove the
fuses F1 and F2 on the screw terminal.
The power supply is factory-set and should not be changed.
M0079A1A.doc Id.-No. 151775 Page 23 10-March-00
User’s manual for Repeater MRx01B Power
STYLEREFSEQARABICFunctions and features
3.1 Band and channel selectivity
The selectivity is achieved by highly selective filters in the IF part of the band / channel
modules.
3.2 Gain setting
The gain can be changed by introducing attenuation into the amplifier chain. By using a rotary
switch the attenuation can be adjusted locally in the range from 0 dB to 30 dB maximum in
steps of 2 dB. The attenuation can be set for the UL and DL path separately.
The rotary switches are mounted on the mother board. These switches are accessible through
the long hole between the two conversion modules (see figure 3-1 Position of rotary
switches). They can be adjusted easily by means of a small screwdriver.
long hole
figure 3-1 Position of rotary switches
For remote control an RS232 interface can be used to set the gain.
The functions of the control module may be used locally by means of a VT100 terminal or a
personal computer emulating the VT100 terminal. See also chapter 6.2, which deals with
settings of operational parameters.
M0079A1A.doc Id.-No. 151775 Page 24 10-March-00
User’s manual for Repeater MRx01B Power
3.3 ALC
In order to protect the amplifiers from overload and to prevent the system to generate spurious
emission, the amplifiers have an Automatic Level Control, designed to limit the output power
to a defined level. A part of the output power is rectified, amplified and used to control an
attenuator network.
FNote: The ALC protects the feedforward amplifier. To keep spurious emissions
below certain limits, the input power into the Repeater and the attenuation
settings of the repeater have to be considered properly.
3.4 CFO
Each conversion module has got a different offset of the set center frequency. This offset is
compensated by software settings (see software manuals).These settings are already factory
set and should only be changed when neccessary. The CFO (center frequency offset) is noted
on the label on top of the conversion module.
3.5 BITE and alarms
The Built-In TEst concept comprises the monitoring of the power supplies, the operational
currents in the conversion modules, the mother board and the remote control interface.
Furthermore, the synthesizer lock and the temperature of the Repeater are monitored.
There are three multicoloured LEDs mounted on the control module. The LED L3 indicates
the presence of electrical power of +12VDC in the Repeater. Every alarm is indicated by the
failure LEDs, L1 and L2.
For the position of the LEDs on the control module see figure 2-4 Configuration of the control
module ( Rev.07 and higher ).
All alarms can be checked by typing the ‘STATUS HIST’ command. Minor alarms with no
influence on the system can be cancelled by typing the ‘ALARMACKN’ command, e.g. ALC
active, VSWR or door open. The following print screen illustrates a possible ‘STATUS
HIST’ report
In case a hardware failure is detected the concerning hardware module has to be replaced. An
alarm can be acknowledged manually by software command. If all alarms have been
acknowledged the summary error LEDs are set back to green indication.
In case of mains power failure all data of the STATUS HIST list are lost.
The alarm can also be sent to the OMC.
M0079A1A.doc Id.-No. 151775 Page 25 10-March-00
Loading...