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BRU3 Logic and Radio
1 General ........................................................................................................ 3
2 Hardware Units............................................................................................ 4
3 Hardware Modules ...................................................................................... 6
3.1 Logic and Modem Equipment.......................................................... 6
3.2 Radio Unit Modules ......................................................................... 7
3.3 Power Supply Equipment................................................................. 7
4 Modem Equipment ...................................................................................... 8
4.1 Telephone Modem Boards ............................................................. 10
4.1.1
V.11 and V.28 Serial Interfaces.......................................... 10
4.1.2
Interface signals .................................................................. 11
4.1.3
Connector............................................................................ 12
5 Logic Equipment ....................................................................................... 13
5.1 Synchronous Serial Circuit ............................................................ 14
5.2 Main CPU including Memory........................................................ 14
5.3 Dual Port Memory.......................................................................... 14
5.4 Signal Processor Unit with Memory .............................................. 15
5.5 Console Ports ................................................................................. 15
5.6 LEDs .............................................................................................. 15
5.7 Reset Button ................................................................................... 16
6 Radio System............................................................................................. 17
6.1 Radio Parameters ........................................................................... 18
6.1.1
Frequency Band 400 MHz (HRB 104 43/xx) ..................... 18
6.1.2
Frequency Band 800 MHz (HRB 104 43/C20) .................. 19
6.1.3
6.1.4
Frequency Band 900 MHz (HRB 104 43/C7, C8).............. 20
6.2 Radio Units..................................................................................... 21
6.2.1
Transmitter.......................................................................... 21
6.2.2
Modulation Synthesizer ...................................................... 22
6.2.3
Receiver .............................................................................. 22
6.2.4
Reference Oscillator ........................................................... 22
BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07
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Summary of Contents for Ericsson BRU3
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Page 1: Table Of Contents
Frequency Band 900 MHz (HRB 104 43/C7, C8)....20 6.2 Radio Units..................21 6.2.1 Transmitter................21 6.2.2 Modulation Synthesizer ............22 6.2.3 Receiver ................22 6.2.4 Reference Oscillator ............22 BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... - Page 2 The contents of this document are subject to revision without notice due to continued progress in methodology, design and manufacturing. Ericsson shall have no liability for any errors or damages of any kind resulting from the use of this document. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07...
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Page 3: General
3 (34) General The Base Radio Unit 3 (BRU3) is a complete one-channel radio base station which uses 8 kbps data signalling and is designed for the 400, 800 and 900 MHz frequency band. The BRU3, which may be installed outdoors and indoors, is a link between the mobile terminals (MOB) and the area exchanges (MOX) in the Mobitex Network. -
Page 4: Hardware Units
FE Battery Unit, for power supply backup FE Adaptation Board The FTF is hinged to the bottom part and works as a cover as well as a cooling flange, offering good thermal management for the BRU3. The FTF comprises: FE Computer Board FE Modem Board... - Page 5 BRU3 LOGIC AND RADIO SYSTEM 5 (34) Figure 1 Base Radio Unit (BRU3). BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07...
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Page 6: Hardware Modules
6 (34) BRU3 MANUAL Hardware Modules The BRU3 hardware is shown in Figure 1 “Base Radio Unit (BRU3).”. The BRU3 Logic and Modem Equipment, Radio System and the Power Supply Equipment are housed in one single cabinet. The following subsections briefly describe the modules that are directly involved in the traffic flow and signal processing to be outlined below. -
Page 7: Radio Unit Modules
FE Radio Board FFM FE Filter Module Power Supply Equipment FE Power Supply Unit FBU FE Battery Unit FHU FE Heating Unit FHB FE Heating Board FE Heating Element BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 8: Modem Equipment
Line interface block diagram. There are three alternative line interfaces for connection to a MOX: • telephone modem V.32 • balanced serial interface V.24/V.11 (RS422) • unbalanced serial interface V.24/V.28 (RS232) BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... - Page 9 The choice between telephone modem, balanced serial interface and unbalanced serial interface, is made by setting Switch 2 (SW2) as follows. To locate Switch 2, please refer to FE Computer Board - FCB in the BRU3 Mechanical Design section. Switch 2...
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Page 10: Telephone Modem Boards
Adaptation Board (FAB). Depending on national requirements issued by the telecommunications administration in your country, different versions of the FAB may be used. Also, depending on the BRU3 variant, the telephone modem may not be installed. Two-wire leased, four-wire leased or switched lines are used for data transmission. -
Page 11: Interface Signals
CCITT V.24 Circuit No. Description Signal Protective Ground Signal Ground Transmit Data Receive Data Request to Send Data Terminal Ready Data Carrier Detect External Transmit Clock Transmit Clock Receive Clock BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 12: Connector
DCD (109) DCD- (109) DCD+ (109) TD+ (103) RD+ (104) RTS+ (105) TC+ (114) TC (114) TC- (114) RC (115) RC- (115) RC+ (115) ETC+ (113) ETC (113) ETC- (113) BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 13: Logic Equipment
Signal processor unit (SPU) with memory • Console ports • LEDs for Watchdog alarm and status indication • Reset button • Switch 2 (SW2) for setting line interface alternative. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 14: Synchronous Serial Circuit
The dual port memory transfers data between the main CPU and the Signal processing unit (SPU). The size is 2Kbit * 16. The memory is implemented in a dual port memory chip. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 15: Signal Processor Unit With Memory
Watchdog alarm Lit when the Watchdog is released. If so, a reset pulse is generated. The Watchdog LED is lit and the signal WDSTATUS, read by the CPU, peaks. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 16: Reset Button
CPU reset: The reset is performed by the CPU when a reset instruction is executed. In this specific case, no reset of the CPU itself is carried out. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 17: Radio System
BRU3 LOGIC AND RADIO SYSTEM 17 (34) Radio System Figure 5 Radio system block diagram. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 18: Radio Parameters
W TxBP filter Antenna impedance ohms For a list of all Product Numbers, please refer to the Introduction and Product Specification section in the BRU3 - General module. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 19: Frequency Band 800 Mhz (Hrb 104 43/C20)
W TxBP filter Antenna impedance ohms For a list of all Product Numbers, please refer to the Introduction and Product Specification section in the BRU3 - General module. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 20: Frequency Band 900 Mhz (Hrb 104 43/C7, C8)
W TxBP filter Antenna impedance ohms For a list of all Product Numbers, please refer to the Introduction and Product Specification section in the BRU3 - General module. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 21: Radio Units
21 (34) Radio Units The BRU3 Radio Unit is operated locally on site by using a VT-100 compatible terminal, e.g., a portable PC, and FB-TEST. By using FBTEST, it is possible to set TX and RX frequencies, transmitter power, alarm levels, parameters etc. -
Page 22: Modulation Synthesizer
The output frequency is adjusted with an input control voltage. For information on how to adjust the reference oscillator, please refer to Software Commissioning Procedure in the Commissioning Procedure section of the BRU3 - General module. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 23: Radio Control Circuit
Temperature, Transmitter power and Reflected power) are measured with A/D converters in this circuit. 6.2.6 Filter A high performance low loss duplex filter is used to achieve sufficient isolation between the receiver and the transmitter. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 24: Power Supply Equipment
Figure 6 Power supply block diagram. The BRU3 power supply parts are located in the FE Case Bottom Frame (FBF). The power supply parts include the FE Power Supply Unit (FPU) and the FE Battery Unit (FBU). The FE Heating Unit (FHU) located in the FE Case Top Frame (FTF), is also regarded as a part of the power supply. -
Page 25: Power Supply Unit
The AC/DC module is an isolated switchmode power supply which supplies the DC/DC module, the charge control and the radio part with 14V. 7.1.2 DC/DC Module The DC/DC module is a non-isolated step-down converter that supplies the logic with 5V. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 26: Battery Charge
Power output to the FCB (5V and 14.7V) and SUPPLY power input from the FBU (14.7V). 7.1.7 Switches Switch Function MAINS SWITCH AC power supply on/off switch BATTERY SWITCH Battery power supply on/off switch BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 27: Leds
The FE Battery Unit (FBU), located in the FTF, consists of a battery pack of 12 NiCd cells 1.2V 4Ah with extended temperature range. The battery is designed to withstand continuous charge. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 28: Heating Unit
The FE Heating Unit (FHU) is located in the FE Case Top Frame (FTF). The FHU ensures that the temperature inside the BRU3 is within set limits. The unit consists of the FE Heating Board (FHB), including a heating regulator, a heating element and an overheating protection device. -
Page 29: Bru3 Connections
BRU3 LOGIC AND RADIO SYSTEM 29 (34) BRU3 Connections The following table gives a brief description of the BRU3 connections used. The position numbers found in the “Position” column refer to the corresponding position numbers in Figure 7 “BRU3 external connections.”. - Page 30 Pos 2 is used as the antenna connection when a combined RX/TX antenna is used, i.e., in case an optional duplex filter is installed. The ground connection is to be found on the outside of the BRU3. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07...
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Page 31: I/O Connections
One of the external alarm loops is by default strapped for the open case alarm. Antenna connections: Number of connections 1 or 2 (Duplex or Bandpass filter), Located on FNB Connector type TNC, female BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 32: Software Description
PREBOOT resides. The process of receiving programming information from the Console Port is called program loading. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... -
Page 33: Boot Fe
10.4 FBTEST FBTEST is an application program that executes a number of test procedures for the base station hardware. For further information, please refer to the FBTEST Reference Manual. BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07... - Page 34 34 (34) BRU3 MANUAL BRU3 MANUAL, Doc.no: 155 16-ANNA 805 08 Uen, Rev H, 2003-02-07...
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