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OM Instructions
1 Design, Function and Operation.................................................................. 3
1.1 General ............................................................................................. 3
1.2 Mechanical Parts .............................................................................. 4
1.3 Start-Up and Shutdown Procedures ................................................. 8
1.3.1
Start-Up Procedure ............................................................... 8
1.3.2
Shutdown Procedure ............................................................. 8
1.3.3
Restarting the BRU3 (Warm Start)....................................... 9
1.3.4
Manual Restart of the BRU3 ................................................ 9
1.3.5
Manual Restart of a BRU3 in Stand Alone Mode .............. 10
1.4 Network Connections..................................................................... 12
1.4.1
General................................................................................ 12
1.4.2
Telephone Modem Boards.................................................. 13
1.5 Logic Units..................................................................................... 17
1.5.1
General................................................................................ 17
1.5.2
Connections ........................................................................ 17
1.5.3
LEDs ................................................................................... 18
1.5.4
Reset Button........................................................................ 18
1.6 Radio Units..................................................................................... 19
1.6.1
General................................................................................ 19
1.6.2
Radio Operation .................................................................. 21
1.6.3
Reset.................................................................................... 21
1.6.4
Connectors .......................................................................... 21
1.7 Power Supply ................................................................................. 22
1.7.1
General................................................................................ 22
1.7.2
FE Power Supply Unit (FPU) ............................................. 23
1.7.3
FE Battery Unit (FBU) ....................................................... 26
1.7.4
FE Heating Unit (FHU) ...................................................... 27
1.8 Alarms ............................................................................................ 28
2 Maintenance .............................................................................................. 29
2.1 General ........................................................................................... 29
2.2 Equipment Required....................................................................... 30
BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10
Contents
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Related Manuals for Ericsson BRU3
Summary of Contents for Ericsson BRU3
- Page 1 Shutdown Procedure ............. 8 1.3.3 Restarting the BRU3 (Warm Start)........9 1.3.4 Manual Restart of the BRU3 ..........9 1.3.5 Manual Restart of a BRU3 in Stand Alone Mode ....10 1.4 Network Connections..............12 1.4.1 General................12 1.4.2 Telephone Modem Boards..........13 1.5 Logic Units..................
- 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: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
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Page 3: Design, Function And Operation
This section describes the design, function and operation of the Mobitex Base Radio Unit 3 (BRU3). During normal operation, all actions necessary for the operation and check of the BRU3 are carried out at the Network Control Centre (NCC). When operating the BRU3 on site, the following equipment is required: •... -
Page 4: Mechanical Parts
4 (60) BRU3 MANUAL For a description on how to connect the portable PC to the BRU3, please refer to Shutdown Procedure in the Start-Up and Shutdown Procedures section below. BRU3 is a complete one-channel compact radio base station which uses 8 kbps data signalling and is designed for the 400, 800 or 900 MHz band. - Page 5 FE Adaptation Board (FAB) FE Case Top Frame (FTF) FE Computer Board (FCB) FE Modem Board (FMB) FE Radio Board (FRB) FE Filter Module (FFM) FE Heating Unit (FHU) FE Connection Board (FNB) BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
- Page 6 6 (60) BRU3 MANUAL Figure 3 BRU3 external connections. RX Antenna TX Antenna Power Connection Telephone Line Connection Modem Connection RS422C Modem Connection RS232C Alarm Connection Console Connection BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
- Page 7 Pos 2 is used as the antenna connection when a combined RX/TX antenna is used. The table below 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 3.
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Page 8: Start-Up And Shutdown Procedures
Check, after a few seconds, that no red alarm LEDs are lit on the FCB or FPU. Note! The warm-up time for the BRU3 is required to be at least 30 minutes, before the transmitter is activated. Specifications for the BRU3 are valid after this period. -
Page 9: Restarting The Bru3 (Warm Start)
The manual restart procedure below should be used only if NODOP does not respond to any command. Otherwise, use the NODOP BOOT command. Pressing the reset button will cause an immediate restart of the BRU3, without ensuring a proper node shutdown. The restart may result in loss of user traffic and data. -
Page 10: Manual Restart Of A Bru3 In Stand Alone Mode
1.3.5 Manual Restart of a BRU3 in Stand Alone Mode This is short description on how to boot the BRU3 using a PC and a terminal program. When the connection is up and running (use 19200 bps 8N1), cold start the BRU3 by switching the power on and off. After a short while, some text will be displayed on the terminal. - Page 11 OPERATION AND MAINTENANCE, MODULE B1 11 (60) 10. The BRU3 should reboot and you will receive the CMD> prompt. Type “B WP2: MAIN_SW.MFE” again and the BRU3 will reboot once more. 11. When the second reboot is finished, the BRU3 will display “USERNAME:”.
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Page 12: Network Connections
Line interface block diagram. 1.4.1 General There are three alternative line interfaces for connection to MOX: • telephone modem V.32 • balanced serial interface V.11 (RS422B) • unbalanced serial interface V.28 (RS232C). BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10... -
Page 13: Telephone Modem Boards
The choice between telephone modem, balanced serial interface and unbalanced serial interface, is made via hardware strapping, i.e., only one line interface alternative is available at a time. In some BRU3 variants the telephone modem is not applicable which means that only a balanced serial interface and an unbalanced serial interface are available. - Page 14 FE Modem Board (FMB). 2x20 pin header with 0.1" module: For connecting the V.24 interface and power from the main board of the BRU3, and also, connection of the analog/digital signals between the FMB and FAB. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
- Page 15 2x10 pin header male connector with 0.1" module used for inter connection to the FMB. 2x4 pin header male connector with 0.1" module used for connection of the various telephone lines. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
- Page 16 9-pole D-SUB female, used for alarm connections 9-pole D-SUB female, used for connection of telephone lines (RS232-MOX) 25-pole D-SUB male, used for modem connection. (RS422-MOX) 25-pole D-SUB male used for modem connection. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
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Page 17: Logic Units
By the FNB and FMB, this port can be used for V.24/V.28, V.24/V.11 or V.24/V.32. CONSOLE and NODOP Connection (Port B) Port B is intended for using a CONSOLE and NODOP via the FNB with the V.24 signals RX and TX. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10... -
Page 18: Leds
Watchdog reset. The reset is activated by the watchdog function if not maintained. 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: 1543-ANNA 805 08 Uen Rev H, 2003-06-10... -
Page 19: Radio Units
19 (60) Radio Units 1.6.1 General The BRU3 is designed for duplex traffic 8 kbit GMSK modulation on the 400, 800 or 900 MHz band. Figure 9 FE Radio Board (FRB) - 900 MHz. Figure 10 FE Radio Board (FRB) - 800 MHz and 900 MHz. - Page 20 20 (60) BRU3 MANUAL Figure 11 FE Radio Board (FRB) - 400 MHz. Figure 12 FE Radio Board (FRB) - 400 MHz, ROA 117 8897 BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
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Page 21: Radio Operation
21 (60) 1.6.2 Radio Operation The BRU3 radio units are operated locally on site by using a portable PC and FBTEST. By using FBTEST, it is possible to set TX and RX frequencies, transmitter power, alarm levels, parameters, etc. Selecting "Radio Operations" on the FBTEST Main menu makes it possible to... -
Page 22: Power Supply
General Figure 13 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 23: Fe Power Supply Unit (Fpu)
To secure uninterrupted power function, a battery charge check checks that the batteries maintain the highest capacity possible. Failure due to low charging is also reported to the FCB. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10... - Page 24 Power output to the FCB (5V and 14.7V) and power INT. SUPPLY input from the FBU (14.7V) Switches Switch Function MAINS SWITCH AC power supply on/off switch BATTERY Battery power supply on/off switch SWITCH BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
- Page 25 Fuses Fuse Type Safety device for F1 6.3AT 250V 6.3AT 5x20 mm Mains input F2 6.3AT 250V 6.3AT 5x20 mm F3 6.3AF 250V 6.3AF 5x20 mm Power to/from the FBU BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
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Page 26: Fe Battery Unit (Fbu)
12 NiCd cells 1.2V 4Ah, with extended temperature range. The battery pack is designed to withstand continuous charge. The battery unit will start supplying the BRU3 with power when the main power supply goes below 90/198V. The unit is able to supply the BRU3 with power for 30 minutes (39xx) and 15 minutes (34xx and 38xx) respectively. -
Page 27: Fe Heating Unit (Fhu)
Figure 16 FE Heating Unit (FHU). 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 the requested limits. The unit consists of the FE Heating Board (FHB) including a heating regulator and a overheating protection device. -
Page 28: Alarms
External alarm 1 For customer use. Case alarm The alarm is used for checking that the BRU3 is closed, i.e. a physical access check. For information regarding the setting of alarm limits, please refer to 1.7 Power Supply in this section. -
Page 29: Maintenance
The scheduled, visual and preventive maintenance is carried out to increase the operational reliability of the electrical and mechanical parts of the BRU3. If running a Function Check on a BRU3 mounted outdoors, it is recommended that the check be carried out under weather-protected conditions for the service personnel and test equipment used. -
Page 30: Equipment Required
To carry out maintenance on the BRU3 on site, the following equipment is required: • Portable PC including VT-100 emulation software • FE Console Cable TSRA 902 0190 for connection of the PC to the BRU3 "P1-CONSOLE" port • Frequency counter 1 GHz Degree of accuracy: 0.01 ppm •... -
Page 31: Maintenance To Be Performed
Visual and Preventive Maintenance Radio Unit Reference Oscillator In the BRU3, the reference oscillator checks the channel unit frequency. Thus, adjustment check of the reference oscillator, in accordance with the following procedure, implies check of the channel unit frequency accuracy. - Page 32 BRU3 MANUAL Test procedure Note! To carry out the test and adjustment procedure, the BRU3 has to be switched off. Please refer to the shutdown procedure described in this section. Connect the frequency counter via the RF attenuator to the BRU3 TX ANT.
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Page 33: Battery Test
2.4.2 Battery Test Every 6 months, and always before visiting a BRU3 site for regular maintenance work, it is recommended to perform a battery test. The battery test, which is described below, is executed from NODOP or from OM at the NCC. -
Page 34: Function Check
Power meter • Multimeter • Ericsson test modem LPBA 109 08 or RF signal generator 1 GHz with a built-in GMSK-modulator • 1 pc of Radio Communication test set, including - RF signal generator 1GHz, with external FM DC input - Modulation Meter. -
Page 35: Check Of Internal Power Supply (Mains And Battery)
Make sure the yellow LED "MAINS" is not lit. Measure the voltage in the FCB measure points marked "+14V", "+5V" and "+8V". Read the value measured on the voltmeter display. Check the result against the requirements specified. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10... - Page 36 36 (60) BRU3 MANUAL Figure 17 Measurement points on FCB. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
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Page 37: Fbtest Board Test
2.5.4 FBTEST Board Test Check of BRU3 boards Requirements It is required that a Medium board test of all BRU3 boards should be carried out before taking the BRU3 into operation. No errors are accepted. Test equipment • Portable PC including VT-100 emulation software •... -
Page 38: Channel Unit Output Power
2.5.5 Channel Unit Output Power Check of the transmitter channel unit output power Requirements The nominal output power differs depending on the BRU3 version purchased. For tolerances, please refer to the tables below: 900 MHz, 3W version: Power Attenuation (dB) - Page 39 Power Attenuation (dB) Tolerance (+dB) Tolerance (-dB) 400 MHz 6.0W 3.0W 1.5W 800mW 400mW 200mW 100mW 50mW Measurements must be carried out on the correct carrier frequency for the 34xx. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
- Page 40 Degree of accuracy: better than ±0.5 dB • Coaxial cable. Test procedure Connect the output power meter to the BRU3 antenna connection. Use FBTEST to set the correct transmitter carrier frequency for the site. Use FBTEST to select the desired power level. Start the transmitter.
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Page 41: Transmitter Deviation
Degree of accuracy: better than ±3.0%. Test procedure Connect the deviation meter to the BRU3 TX ANT. connection. Use FBTEST to set the correct transmitter carrier frequency for the site. Select the power level which corresponds to -6 dB attenuation of the transmitter. -
Page 42: Bit Errors At High Signal Levels
RF signal generator 1 GHz with a built-in GMSK-modulator. The generator must be able to generate the 511 bit PRBS signal used when measuring the bit error rate. (Using this alternative excludes the Ericsson test modem specified above.) Accuracy: Better than 1 dB. - Page 43 Check the result against the requirements specified. Set a new (- 11 dB) RF signal level on the signal generator and the BRU3, and repeat the measurement procedure. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
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Page 44: Receiver Sensitivity
511 bit PRBS signal used when measuring bit errors. (Using this alternative excludes the Ericsson test modem specified above. Accuracy: Better than 1 dB.) BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10... - Page 45 OPERATION AND MAINTENANCE, MODULE B1 45 (60) Test procedure Connect the signal generator to the BRU3 TX ANT. connection. Use FBTEST to set the receiver channel number corresponding to the correct carrier frequency. Set the signal generator’s carrier frequency to the receiver’s nominal carrier frequency.
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Page 46: Receiver Sensitivity At Frequency Deviation
RF signal generator 1GHz with a built-in GMSK-modulator. The generator must be able to generate the 511 bit PRBS signal used when measuring bit errors. (Using this alternative excludes the need of the Ericsson test modem specified above.) Accuracy: Better than 1 dB. - Page 47 Adjust the RF signal level sent to the receiver until the BER value is stabilized to 1.0% Check the result against the requirements specified. Set a new receiver frequency on the signal generator and the BRU3, and repeat the measurement procedure. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
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Page 48: Antenna Input Signal
Note! The transmitter has to be switched off before starting the test procedure is started. Connect the signal generator to the BRU3 RX ANT. connection. Use FBTEST to set the receiver channel number corresponding to the correct carrier wave frequency. -
Page 49: Transmitter Antenna Vswr
> 10 < 1.7 > 12 < 1.5 > 14 Note! The VSWR alarm levels are the recommended values. The individual settings for each BRU3 is decided by the operator. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10... - Page 50 Note the feeder loss, the measured VSWR value and the corresponding VSWR alarm level in the Commissioning Test Record. The VSWR alarm level shall be set using NETREG in NCC. Turn off the transmitter output power by means of FBTEST. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
- Page 51 OPERATION AND MAINTENANCE, MODULE B1 51 (60) 1,1 1,2 1,3 1,4 1,5 1,6 1,7 1,8 1,9 VSWR Figure 18 VSWR nomogram. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
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Page 52: Hardware Alarm Status
INACTIVE (N) Low Tx power (Low Output Power Alarm) INACTIVE (N) Test equipment • Portable PC including VT-100 emulation software • FE Console Cable TSRA 902 0190 • FBTEST software. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10... - Page 53 OPERATION AND MAINTENANCE, MODULE B1 53 (60) Test procedure Select "STATUS OVERVIEW" on the Main Menu. Read the alarm status obtained on the terminal screen. Check the result against the requirements specified. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...
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Page 54: Troubleshooting
This section provides information on the measures to be taken if errors should be found in the BRU3. The section describes the measures to be taken on site. Most of the measures carried out during troubleshooting generate alarms at the NCC, and also, will effect the node’s function. -
Page 55: Power Supply Units
Low power in Battery pack. Check Battery pack power level. Recharge the Battery. ** Is lit when the 14V DC power distribution to the radio unit and the DC/DC module is OK. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10... -
Page 56: Fe Battery Unit (Fbu)
The FE Battery Unit (FBU) does not include LEDs for alarm or status indication. For troubleshooting the FBU, please refer to 3.2.1 FE Power Supply Unit (FPU) in this section. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10... -
Page 57: Logic And Modem Units
Action Power failure. Check power distribution on FCB, measure point "5V". Reset BRU3 via FCB reset button: 1) If BRU3 starts, run FBTEST Board Test for further check. 2) If BRU3 does not start, replace the BRU3. FCB defective. Run FBTEST Board Test, (please refer to the FBTEST Reference Manual). -
Page 58: Fe Modem Board (Fmb) & Fe Adaptation Board (Fab)
Run FBTEST Board Test. To run extended FNB test, plugs must be adapted to the RS422 and RS232 connections on FNB. Replace BRU3 complete if FNB is found to be defective. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10... -
Page 59: Radio Units
Low temperature inside the Check the heating unit (probably out of order). Replace BRU3. the BRU3. No power distribution to FHU. Check FHU connection to FPU. Replace connector if necessary. BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10... - Page 60 60 (60) BRU3 MANUAL BRU3 MANUAL, Doc.no: 1543-ANNA 805 08 Uen Rev H, 2003-06-10...