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ROI-S04605-05FE CONTENTSAugust, 2005
CL-1
7-38 GHz 4/8/17/34 MB
DIGITAL MICROWAVE RADIO SYSTEM
PASOLINK
(1+0/1+1 SYSTEM)
TRP-[ ]G-[ ] EQUIPMENT DESCRIPTION
CONTENTS
TITLE PAGE
1 GENERAL 1-1
1.1 Equipment Composition 1-2
1.2 Equipment Performance 1-3
2 FUNCTIONAL OPERATION 2-1
2.1 Transmitter Section 2-1
2.2 Receiver Section 2-5
2.3 Alarm and Control Section 2-5
3 OPERATION 3-1
3.1 Interface Terminals and Jacks of the ODU 3-1
3.2 Controls, Indicators and Test Jacks of the ODU 3-3
4 MAINTENANCE 4-1
4.1 Precautions 4-1
4.2 Maintenance Control for the ODU 4-3
4.3 Test Equipment and Accessories 4-3
4.4 Periodic Maintenance 4-4
4.5 Corrective Maintenance 4-8
4.5.1 Fault Isolation 4-8
4.5.2 Replacement 4-10
4.5.3 Alignment 4-14
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ROI-S04605 GENERAL
1-1
1. GENERAL
This section provides information on the functions of the TRP-[ ]G-[ ]Transmitter-Receiver (Outdoor Unit (ODU)) used for 4/8/17/34 MB datatransmission. Also included is information on the equipment composition,equipment performance and radio frequency assignment*. Outline of theODU is shown in Fig. 1-1.
Note: * Radio frequency assignment is referred to Appendix in thissection.
Fig. 1-1 Outline of ODU
FOR 7-38 GHz BAND ODU
FGIFLMON
RX LEV
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GENERAL ROI-S04605
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1.1 Equipment Composition
The ODU is provided with modules which are connected directly or bycoaxial cable as shown in Table 1-1.
Note: * Location numbers are keyed to those in Fig. 1-2.
Note: Location numbers are keyed to those in Table 1-1.
Fig. 1-2 Component Module Arrangement
Table 1-1 Component Module Arrangement
LOCATION
NO. *MODULE
APPLICATION
7 GHz
H0738( )
8 GHz
H0739( )
13 GHz
H0330( )
15 GHz
H0331( )
18 GHz
H0332( )
23 GHz
H0333( )
26 GHz
H0334( )
38 GHz
H0335( )
1 RF CKT H0722() H0723() H0360( ) H0361( ) H0362( ) H0363( ) H0364 ) H0365( )
2 IF CKT H0721() H0323( ) H0321( )
3 PS H0390()
FGIFLMON
RX LEV
1
3
A
View A
2(IF CKT)1 (RF CKT)
7-26 GHz
1 (RF CKT)
38 GHz
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1.2 Equipment Performance
The performance characteristics of the ODU are listed in Table 1-2 andradio frequency assignment is provided in para. 5.1.
Table 1-2 Performance Characteristics
ITEM 7 GHz 8 GHz 13 GHz 15 GHz 18 GHz 23 GHz 26 GHz 38 GHz GUARANTEED
Frequency Range
[ GHz]
7.125-
7.9
7.725-
8.5
12.75-
13.25
14.5-
15.35
17.7-
19.7
21.2-
23.6
24.5-
26.5
37.0-
39.5
Frequency Plan ITU-R
F385-6Annex1Annex4
F.386-6Annex1Annex3Annex4
F.497-6 F.636-3 F.595-7 F.637-3 F.748-4 F.749-2
Channel Separat ion 3.5 MHz (4 MB) / 7 MHz (8 MB) / 14 MHz (17 MB; 13.75 MHz also for 18 GHz) /
28 MHz (34 MB; 27.5 MHz also for 18 GHz)
RF TX/RX Spacing[MHz]
154161245
119126266
311.32
266 315420490728
340100810101560
100812001232
1008 1260
Output Powerat Antenna Port
(dBm)
+27 +25 +23 +23 +23 +20 +15 1.5 dB(ATT=0)
Power Control 0 to 30 dB, in 1 dB steps, variable 1.0 dB
Frequency Stability 5 ppm 10 ppm
Receiver NoiseFigure
4.5 dB 4.5 dB 4.5 dB 4.5 dB 5.5 dB 6.5 dB 7.0 dB 7.5 dB +1.5 dB
Maximum InputLevel
-15 dBm (No ERROR)
IF signal interface(between IDU and
ODU)
Signal frequency
TX: 850 MHz
RX: 70 MHz
Signal level
Input: -52 to -3 dBm for 7-38 GHz, varies with cable length(maximum cable length: L=300 m/8D-FB)
Output: 0 dBm, nominal
Orderwirefrequency
Output: 468 kHz, AM
Input: 450 kHz, AM
DC component -43 V DC
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4 pages
Notes: *1 For direct mounting type ODU, the RF IN/OUT port used isNEC special flange, not PBR flange.
Control/Monitorsignal frequency
10 MHz, ASK (at IF IN/OUT)
Impedance 50 ohms, unbalanced
Type of RF IN/OUTPortion *1
N-Female PBR - 140 PBR - 220 PBR -260 PBR - 320
Dimensions: 236 wide 236 high 113 deep (mm)
Weight: Approx. 3.5 kg
Environmental
temperature range
Operation -33C to +50C
Storage -40C to +70C
Table 1-2 Performance Characteristics (Contd)
ITEM 7 GHz 8 GHz 13 GHz 15 GHz 18 GHz 23 GHz 26 GHz 38 GHz GUARANTEED
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ROI-S04605 FUNCTIONAL OPERATION
2-1
2. FUNCTIONAL OPERATION
This chapter describes the functional operation of the ODU whichcomprises of transmitter section, receiver section, and alarm and controlsection. A functional block diagram is shown in Fig. 2-1.
2.1 Transmitter Section
This section describes Engineering Orderwire (EOW) signal demodulationand IF-to-RF conversion.
The 850 MHz IF signal which comprises an EOW signal, monitor (MON)signal, alarm and control signals and DC component from the IDU isseparated through the MPX circuit. The EOW signal is processed at theCPU and fed to the RX LEV MON jack. The DC component is applied tothe PS module to produce regulated DC voltages which are used in theODU. The 850 MHz IF signal enters the mixer (MIX) through the AGCAMP which compensate for any input IF signal level variations.
The MIX mixes the incoming 850 MHz IF signal with a [ ] GHz band localsignal generated by the synthesized RF local oscillator to produce thespecified transmit RF signal.
The transmit RF signal enters a BPF which eliminates undesired
components generated in the IF-to-RF conversion. The filtered RF signalgoes to the RF amplifier where it is amplified to the required level by anautomatic level control (ALC) circuit. The amplified RF signal is then fedto the antenna through the Duplexer.
The automatic transmitter power control (ATPC) function automaticallyvaries the TX output power according to path conditions. Fading exertsheavy influences on propagation, causing the receive signal level at theopposite station to vary. The ATPC function operates by controlling thetransmitter output power of the local station according to the variation ofthe received signal level at the opposite station. The received signal levelvariation at the opposite station is informed to the local station using the
ATPC bits in the overhead.
Normally, the ATPC function is used as ATPC-ATPC mode between twostations. However, different mode such a MTPC-ATPC mode can be usedalso.
When the ATPC function is used, setting of the RX threshold level isrequired on the setting menu with the PC (refer to 3.4 Equipment Settingand Monitoring in Section III MDP Equipment Description). The relationsof ATPC and RX threshold level are as follows:
The ATPC range can be set within 30 dB, from 30 (MIN) to 0 dB(MAX), and the RX threshold level can be selected from 80 to 30 dBm.
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The ATPC operates with the RX hysteresis characteristics of 5 dB (fixed)
in UP, DOWN and HOLD modes.
In UP mode:operates when the RX received level has fallen less than RXthreshold level. (selected MAX is limited UP level.)
In DOWN mode:operates when the RX received level has risen more thanRX threshold with hysteresis level. (selected MIN islimited DOWN level.)
In HOLD mode:operates when the RX received level is within RXthreshold level with hysteresis level and RX thresholdlevel. Or under FSYNC ALM condition.
For example, when the MAX is set to 0 dB, MIN is set to 10 dB in theATPC TX power range, and the RX threshold is set to 60 dBm. In thiscase, if RX received level has fallen lower than 60 dBm, the TX outputrises in 1 dB step in UP mode of the ATPC control by comparing the RXreceived level with the RX threshold level in 1 dB step. Then, the RXreceived level has risen within 60 to 55 dBm, the TX power ismaintained in the HOLD mode.
The ATPC operates under the ODU alarm conditions are described asfollows:
When the ATPC MAX PWR control is continuously activated more than90 sec., the MAX PWR ALM is generated under the frame synchronizedconditions. But, it does not counting during the FSYNC ALM condition.
When the FSYNC ALM condition is continued more than 90 sec..
The MAX PWR ALM is released when the ATPC becomes DOWN mode,manual switchover control is performed for standby channel in HS system,or control setting of CW, MUTE, ATPC manual ctrl, FE/NE loop back orTX SW ctrl in HS system is performed in MAINT mode, or changing thesetting of MTPC, TX/RX frequency, BIT rate.
The following is an example of MTPC-ATPC mode operation betweentwo stations.
RX Received Level
RX
Hysteresis5 dB Fixed
TimeRX Threshold Level
60 dBm (80 to 30 dBm settable)
55 dBm (75 to 25 dBm)
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The transmitting level of station B is controlled so that the receiving levelof station A reaches the RX threshold set level (50 dBm) which is set instation A. This method is used in station A for reducing the level ofinterference to other route. As station A is set in the MTPC mode, thetransmitting level is kept unchanged.
Then an example of using MTPC-ATPC is shown below. As shown in thefigure, in the master station communicating with many substations andwhen the RX received level fell, the TX power rises, diffraction signalinterfere with other route. Therefore, set to MTPC mode to keep constantTX level in master station. The substations must be set ATPC mode tominimize the diffraction (interference) to other routes at the master stationwhile the receiving level is down in propagation at individual substations.In substations, there is little possibility of occurrence of the diffraction;therefore, the master station can be set in the MTPC mode to permittransmission at a constant level.
A constant transmit output power in both MTPC and ATPC is maintainedusing the ALC function which is provided in the RF CKT module. TheALC circuit detect the transmit output power using a diode to obtain a DCvoltage proportional to the transmit power. The gain of the RF amplifier iscontrolled inversely with this detected DC voltage to maintain the transmitoutput power within the specified limits.
STATION A STATION BTXRX
(Tx power is fixed at MTPC level.)
(RX threshold level is set to 50 dBm)
MTPC ATPC
(MTPC)
(ATPC)
SUBSTATION 2
(ATPC)
SUBSTATION 3(ATPC)
SUBSTATION 4
MASTER
STATION(ATPC)
SUBSTATION 1
(ATPC)
SUBSTATION 5
(A)
(B)
(A),(B)
(C)
: Diffraction to other route.
: RX received level down.
(C)
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2-4
MIX
MPX
ALM
RX IF F DATA
TX F DATA
SYNTH IF ALM
SYNTH RF ALM
RX IF LEV MON
T PWR MON
T PWR CTRL
TX IF LEV MON
MAINIF AMP
AGC
MIX
20 MHz
AGCAMP
IF
IDU)
(TO/FROM
-7 V
RX LEVMON
IF:850 MHz
IF:70 MHz
RF CKT
IF CKT
Fig. 2-1 Functional Block Diagram of the ODU
+7 V
MIX
LO
AMP
TRX
VCOPD1/2
PD
1/2
(EOW)
PS
VCO
-40 V
-40 V
TX IF LEV CTRL
RX IF LEV CTRL
CPU
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2.2 Receiver Section
This part describes RF-to-IF conversion, IF-to-IF conversion and EOWsignal modulation.
An RF signal received from the antenna are filtered by the BPF and entersthe first MIX. The first MIX mixes the applied RF signal with an localsignal which is generated by a synthesized RF local oscillator to produce afirst IF signal. Then, the IF signal is fed to the second MIX through theBPF which eliminates undesired components. The second MIX mixes the1st IF signal with a local signal generated by a synthesized IF localoscillator to produce a 70 MHz IF signal.
The 70 MHz IF signal passes a 70 MHz BPF which eliminates undesiredcomponents. The filtered 70 MHz IF signal goes to the main IF amplifier(MAIN IF AMP). The IF signal amplified by the MAIN IF AMP withautomatic gain control (AGC) passes through the MPX circuit.
The MPX circuit combines alarm, monitoring and response signals whichare processed at the CPU in the ODU and the EOW signal with the IFsignal. These signals are fed to the IDU from the MPX circuit.
2.3 Alarm and Control Section
Alarm and control functions of the ODU are described here. Fault
detection circuits are provided in the ODU. The detected alarm signals aregathered into the CPU which processes the alarm signals to be sent to theIDU. Here, the TX PWR ALM signal is produced by the T PWR MONsignal issued from the RF AMP circuit and the IF INPUT ALM signal is
produced by the TX IF LEV MON signal issued from the IF amplifier withAGC AMP circuit. The RX LEV ALM is also produced by the RX IF LEVMON signal issued from the MAIN IF AMP circuit. The initiated alarmsignals are sent to the IDU combined with the IF signal through the MPXcircuit. Fault in the ODU can be monitored with alarm indicators on theIDU. The received RF signal level can be monitored at the RX LEV MON
jack of the ODU by connecting the OW/RX LEV Monitor (optional) ordigital voltmeter.
In addition, the following operating condition of the ODU are monitored atthe IDU by connecting the personal computer.
Transmitter output power
Received signal level
DC voltage
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6 pages
The setting of the radio frequency and TX output power are performed
from the IDU using personal computer. The TX output power can becontrolled by a control command signal (T PWR CTRL) from the IDU.
To communicate with the opposite station or with the IDU usingorderwire, an optional OW/RX LEV monitor unit is necessary, the HEADSET jack is provided on the OW/RX LEV Monitor. Therefore, connect theOW/RX LEV Monitor to the RX LEV MON jack on the ODU.
Note: (*) 1 or 2 for channel No. in 1+1 system.
Table 2-1 Alarm Indication and Reporting
INITIATING
MODULE ALARM CONDITIONALARM
INITIATED
RF CKT
IF input signal from IDU lost IF INPUT ALM (*)
Transmit RF power decreases 3 dBfrom nominal
TX PWR ALM (*)
APC loop of TX local oscillator orfirst local oscillator for RX unlocks
APC 1 ALM (*)
APC loop of second local oscillatorfor RX unlocks
APC 2 ALM (*)
Receiver input level decreases bypreset value from squelch level
RX LEV ALM (*)
Communication between IDU andODU is lost
OPERATION ALM (*)
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ROI-S04605 OPERATION
3-1
3. OPERATION
This chapter provides instructions for operating the ODU. Included areinformation on the interface terminals, interface jacks, controls, indicators,test jacks, equipment start-up, and equipment shut-down.
3.1 Interface Terminals and Jacks of the ODU
The equipment has interface terminals and jacks to connect with theassociated equipment. These interface terminals and jacks are located asshown in Fig. 3-1 and are used as described in Table 3-1.
Fig. 3-1 Interface Terminal and Jack Locations
7-38 GHz Band ODU
(FG)
IF IN/OUT
(FRONT VIEW)
FGIFLMON
RX LEV
13-38 GHz Band ODU
RF IN/OUT
(REAR VIEW)
7/8 GHz Band ODU
RF IN/OUT
(REAR VIEW)
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Table 3-1 Interface Terminals and Jacks
TERMINAL DESCRIPTION
IF IN/OUT(N-P Connector)
TX IF signal input and RX IF signal output
Power down IDU before disconnection or connection ofcable.
RF IN/OUT(7/8 GHz : N-Female)
(13/15 GHz : PBR-140)(18/23 GHz : PBR-220)(26 GHz : PBR-260)(38 GHz : PBR-320)
RF signal input/output from/to antenna
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3.2 Controls, Indicators and Test Jacks of the ODU
The controls, indicators and test jacks of the ODU are shown in Fig. 3-2.These functions are described as follows.
Fig. 3-2 Controls, Indicators and Test Jacks for 7-38 GHz Band ODU
RX LEV MON jack:
Gives access to monitor receive level voltage.
Facilitate the transmission of EOW signal between IDU and ODUwhen the EOW/RX LEV Monitor and headset is connected.
The X0818A EOW/RX LEV Monitor (optional) is used for operation andmaintenance as shown in Fig. 3-3. The operation range of the OW/RXLEV Monitor is 0 C to +45 C and its functions are described as follows:
METER:Indicates a DC voltage proportional to the receiving RF level.
OW indicator:Lights when OW ON-OFF switch is set to ON. If the OW indicator isnot lit even after setting the OW switch to ON, replace the battery(6F22(UB)/9V).
FGIFLMON
RX LEV
RX REV MON
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OW ON-OFF switch:
Enables transmission of OW signal between IDU and ODU. The OWswitch should be set to ON position to enable OW communication.
VOL control:Enables to adjust receive OW voice level.
RX LEV/OW IN jack:Provide a DC voltage for RX LEV monitoring and OW signal from /to the ODU.
HEADSET jack:Permits communication between IDU and ODU when orderwireheadset is connected.
Fig. 3-3 Controls, Indicators and Test Jacks of OW/RX LEV Monitor
VOL
ONOW
OFF
12 3
4
50
V
PASOLINKANTENNA POINTING MONITOR
OW
RX LEV/OW IN
HEADSET
METER
OW INDICATOROW SWITCH
VOL CONTROL
RX LEV/OW IN JACKHEADSET JACK
BATTERY(6F22(UB)/9V)
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ROI-S04605 MAINTENANCE
4-1
4. MAINTENANCE
This chapter provides instructions for periodic maintenance and correctivemaintenance of the ODU. Also included is information on precautions,test equipment and accessories.
4.1 Precautions
The following precautions must be carefully observed duringmaintenance.
1. The 43 V DC power is superimposed on the centre conductorof the coaxial cable between the IDU and ODU. Connecting ameasurement set directly to this port may damage the testequipment and touching the coaxial cable core may causeelectrical shock. So, power down IDU before disconnection orconnection of cable.
2. To protect the internal circuits against electrostatic discharge,engineers are requested to wear a wrist band and connect it tothe Frame Ground (FG) terminal for Electrostatic Discharge(ESD) before detaching the shield cover (see Fig. 4-1).
3. Before the start of maintenance, including operation of the
OPR SEL SW on the front panel of the equipment, select theequipment to maintenance mode using the LCT.
4. After all operation for maintenance have been completed,perform MAINT OFF setting.
Do not turn on the power of the IDU leaving cable connectionbetween the PC and RA PORT of the IDU.
5. It is recommended that you connect the IDU to ODU after theTX/RX frequency and TX power control setting has been set onthe IDU.
6. This process is most important for the following ODUs that maybe emitted TX power if you set the channel number to "0ch"which is not defined (excepting 13/26/38 GHz band) by the
Radio Frequency Assignment.
Code No. of Corresponding ODU:H0738 (7 GHz), H0739 (8 GHz), H0330 (13 GHz),H0331 (15GHz), H0332 (18GHz), H0333 (23 GHz),H0334 (26 GHz), H0335 (38 GHz)
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Fig. 4-1 Location of ESD Terminal
(a) Before beginning maintenance, notify the opposite station thatmaintenance is about to begin.
(b) After equipment start-up, allow the equipment to warm up for at least
30 minutes.
(c) After completing the maintenance operation, restore all connectionsto normal.
(d) Before disconnecting waveguide, connector or antenna from RF IN/OUT of the ODU, turn off PWR switch of the IDU or set ODU tomute condition (this control is performed by personal computer asshown in following procedure).
(e) During maintenance, the IDU is set to maintenance condition using aPC as shown in following procedure.
Note: If login is not possible, check if settings of the communicationformat are proper.
Note: The numeral keys, 0 to 9 are used for selection of the menuor entering values. Enter key is used for confirmation ofentering values. Esc key is used for cancellation of enteringvalues and display the high rank menu.
Connect the wrist strap.
(IDU for 1+0 System)
(FG to be used as ESD)
IFIN/OUT
TRAFFIC IN/OUT(CH1 to CH8)
TRAFFIC IN/OUT(CH9 to CH16)
IFIN/OUT
IFIN/OUT
(IDU for 1+1 System)
-43VOUTPUT
Power downIDU
beforedi sconnectionorconnection of
Cable
!
-43VOUTPUT
Power downIDUbeforedi sconnection
orconnection of
Cable
!
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4.2 Maintenance Control for the ODU
Step Procedure
1 Connect the PC to the LA PORT of the IDU using an RS-232Ccable as shown in Fig. 4-2,
2 Refer to the procedure in Chapter 4 Maintenance in the SectionIII MDP Equipment Description, perform the maintenancecontrol for the ODU,
Note: At the end of LCT operation log out from LCT menu bykeying "99" and then exit from the communication
software. In case if you have exit from the communicationsoftware without logging out from LCT, repeat connectingand disconnecting of the RS 232C cable once to reset.
4.3 Test Equipment and Accessories
The following test equipment and special accessories described in Table 4-1 are required for system maintenance. If recommended test equipmentand accessories are not available, equivalents may be used.
Table 4-1 Test Equipment and Accessories Required
TEST EQUIPMENT/ACCESSORY TYPE/ORDERING CODEQTY
REQD
Digital Multimeter With Test Leads orOW/RX LEV Monitor
Agilent 34401A or NEC X0818 1
Headset 1
Personal Computer 1
Screwdriver 1
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4.4 Periodic Maintenance
To ensure continuous satisfactory operation of the equipment, perform thefollowing maintenance procedure once a year.
(a) Test Equipment and Accessories Required
Agilent 34401A Digital Multimeter With Test Leads or OW/RX LEVMonitor
Personal computer
Screwdriver
(b) Procedure
There are two methods for periodic maintenance operation on IDUand ODU.
Step Procedure
Method from IDU
Note: If login is not possible, check if settings of the communicationformat are proper.
1 Connect the personal computer to the LA PORT of the IDUusing an RS-232C cable as shown in Fig. 4-2,
Fig. 4-2 LCT Setup
PERSONAL COMPUTER
IDU
RS-232CCABLE(BLACK)
CALLRESET
MAINT
IDUODU
SELV
PWR
FUSE (7.5A)
EOW PASOLINK
+
LA PORTNMS/RA
RESET IDUODUPWR
PASOLINK
MAINT
SELV
+
LA PORT
LA PORT
LA PORTNMS/RA
CALL
OPR
FUSE (7.5A)
FUSE (7.5A)
EOW
RX RXTXTX
OPR ALM
SELNo.1
No.2
1
2
PASOLINKRESET
RESET IDUODUPWR
PASOLINK
MAINT
SELV
+
IDU
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Step Procedure
Note: Before the start of maintenance, including operation of the OPRSEL SW on the front panel of the equipment, select the equipmentto maintenance mode using the LCT.
After all operation for maintenance have been completed,perform MAINT OFF setting.
2 Turn on the power switch on the PC. Then, start-up thecommunication software (e.g. HyperTerminal),
Note:At the end of LCT operation log out from LCT menu bykeying "99" and then exit from the communication software.
In case if you have exit from the communication softwarewithout logging out from LCT, repeat connecting anddisconnecting of the RS 232C cable once to reset.
3 Press the CTRL and D keys at the same time, the followingmenu appears,
4 Enter password and press the Enter key,
5 Press the 0 key and Enter key,
6 The following menu appears,
7 Press the 3 key and Enter key, the following menu appears,
Password :
Password :********Change Password? (no:0 / yes:1):
1. Setting
2. Maintenance
3. Monitoring
99. Exit
Select function No. :
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Step Procedure
For 1+0 System
For 1+1 System
8 Press the 1 key and Enter key, the following monitoringmenu appears,
Note: The voltages shall be indicated within the values shown inTable 4-2 in normal.
TX Power indicated in dB is a relative level to the nominaloutput power.
For 1+0 SYSTEM
For 1+1 System
9 When the Pasolink is working in normal conditions, results shallbe within the values shown in the Table 4-2,
10 Press the 9, 9 keys and Enter key to Exit,
Monitoring
1. Monitoring voltage
2. Monitoring voltage (continuous mode)
3. Alarm/Status
4. Inventory
00. Menu
99. Exit
Select item No. :
Monitoring
1. Monitoring voltage
2. Alarm/Status
3. Inventory
00. Menu
99. Exit
Select item No. :
1. Monitoring voltage
TX power : 4.33V (-1dB)
RX level : 2.98V (-46dBm)
1. Monitoring voltage
TX power 1 :4.33V (-1dB)
RX level 1 :2.98V (-46dBm)
TX power 2 :4.33V (-1dB)RX level 2 :2.98V (-46dBm)
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Step Procedure
Note: To find out the absolute TX Power and RX Level, refer to theconversion table of data sheet which is attached to each ODU.
11 Remove the cap from the RX LEV MON jack (see Fig. 4-3),
12 Connect an RF cable with F connectors to the RX LEV MONjack. With the digital multimeter or OW/RX LEV Monitor unit,confirm that the meter indication is as described in Table 4-3,
13 Disconnect the RF cable, the digital multimeter or OW/RX LEVMonitor and reconnect the cap removed in step 11.
Note: The RX LEV MON connector must be capped for waterproof.
Fig. 4-3 Test Setup for ODU
Table 4-2 Meter Reading from IDU
CHECK ITEM ALLOWABLE RANGE
TX power Depends on transmitter power 0 to 4.6 V DC (for 7-38 GHz ODU)
RX level Depends on received signal level 0.8 to 4.4 V DC (for 7-38 GHz ODU)
Table 4-3 Meter Reading of the ODU
CHECK ITEM ALLOWABLE RANGE
RX level Depends on received signal level (0.8 to 4.4 V DC)
RX LEV MON
12 3 4
50
V
OW
OW/RX LEV MONITOR
RX LEV/OW INFG
IFLMON
RX LEV
Caution: Connect an RF cable with F connectors (Type C15 Male) to the RX LEV MON terminal when theRX LEV is measured with the digital multimeter or OW/RX LEV MONITOR unit. Themeasurement of pin contact of the F connector (Type C15 Male) is specified as shown in the figure.
Do not connect the connectors of other type nor insert the probe of the voltmeter as this may causeconnector damage.
Following translating connector (optional) is to provide facilities when the F connector (Type C15Female) is translated to the BNC connector (Female).
Name of product : 1821K091 F(C15)[F]-BNC[F]
F connector, Type C15 Male
6.5 0.3 mm
0.8 0.05 mm
DIGITAL MULTIMETER
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4.5 Corrective Maintenance
This chapter describes the corrective maintenance in the field. Correctivemaintenance in the field covers fault isolation, replacement and alignment.The procedures describes equipment-level fault isolation. Therefore if anODU is found faulty, it should be replaced with a spare and aligned.
During corrective maintenance, carefully observe the precautions given inchapter 4.1 until alignment is completed.
4.5.1 Fault Isolation
Alarm conditions are identified through:
Red alarm (ODU LED) indication on the IDU or
Notification from external equipment
During alarm conditions, red ODU indicator on the IDU is lit except whenthere is a power supply failure. Faults can be isolated as shown in Fig. 4-4.
Also, refer to Chapter 4 Maintenance in the Section III MDP EquipmentDescription for Fault Isolation Flow Chart.
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Note: Refer to Table 4-2 for allowable range of the TX output monitorvoltages.
Fig. 4-4 Fault Isolation
[2] Is TX output power
within specified
range.
[1] Confirm that working
condition of ODU by
using the LCT at local
station.
[3] ODU(TX) is faulty.
[4] Confirm that working
condition of ODU by
using the LCT at
opposite station.
[5] Is TX output
power within
specified range.
[7] Path-propagation or
ODU (RX) of local
station is faulty.
[6] ODU(TX) of opposite
station is faulty.
No
No
Yes
Yes
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4.5.2 Replacement
Before replacing the ODU with a spare, the spare must be set to meet therequired functions.
Provided here are procedures for replacing the ODU with spares after faultisolation and/or presetting.
(a) Test Equipment and Accessories Required
Screwdriver
(b) Procedure
Step Procedure
Note: Before the start of maintenance, including operation of the OPRSEL SW on the front panel of the equipment, select the equipmentto maintenance mode using the LCT.
After all operation for maintenance have been completed,perform MAINT OFF setting.
Removing
1 Turn off the power switch on the front panel of the IDU (see Fig.
4-5),
2 Loosen IF IN/OUT cable connector (N) on the ODU by turningit counter-clockwise,
3 For 7/8 GHz band ODU, disconnect the coaxial cable form theRF IN/OUT connector,
4 For waveguide connector type of the ODU, to remove thewaveguide from the RF IN/OUT, remove the four waveguidefixing screws using a screwdriver,
Note: Be careful not to damage the O-ring between the
waveguide and ODU.
5 Loosen tightening screw of the frame ground cable and removethe ground cable,
6 Loosen four screws (M6) on the ODU (see Fig. 4-6),
7 Remove the ODU from mounting bracket,
8 Replace ODU with a spare, taking care when handling thewaveguide contact surface,
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Step Procedure
Remounting
9 For antenna direct mount type, when H polarization applies,rotate the ODU so that the plate marked with H turns to up (seeFig. 4-7),
10 For antenna direct connect type, when V polarization applies,rotate the ODU so that the plate marked with V turns to up (seeFig. 4-7),
11 Put new ODU on to the mounting bracket and align the screwsof the ODU with the screw holes of the mounting bracket,
12 Tighten the four screws (M6) on the ODU using a suitablescrewdriver,
13 Connect the coaxial cable between the IF IN/OUT jacks on theIDU and ODU,
Note: After cable connection, the connector part shall bewrapped by self-bonding tape for waterproof.
14 For 7/8 GHz band ODU, connect the coaxial cable to the RF IN/OUT connector,
Note: After cable connection, the connector part shall bewrapped by self-bonding tape for waterproof.
15 For waveguide connect type of ODU, connect the waveguide tothe RF IN/OUT with four screws using a suitable screwdriver,
16 Confirm that the ODU is firmly installed on the mountingbracket,
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4.5.3 Alignment
After replacing the ODU with spares, the ODU must be aligned as follows.
Note: After replacing the ODU with a spare, allow equipment to warmup for at least 30 minutes before alignment.
Note: Before the start of maintenance, including operation of the OPRSEL SW on the front panel of the equipment, select the equipmentto maintenance mode using the LCT.
After all operation for maintenance have been completed,perform MAINT OFF setting.
(a) Test Equipment and Accessories Required
Personal Computer RS-232 cable Agilent 34401A Digital Multimeter (or equivalent) with Test Leads
or X0818A OW/RX LEV Monitor Screwdriver
(b) Procedure
Step Procedure
1 Turn on the power switch of the IDU,
2 Referring to Chapter 3.4 Equipment Setting Procedure inSection III MDP Equipment Description perform radiofrequency and TX output power setting,
Note: Turn the IDU power ON after the ODU is replaced, then confirmsetting items for the new ODU with the PC via IDU, reset to eachitem if there are changed from default.
3 Referring to chapter 4.4 (Periodic Maintenance), confirm thatthe meter indication indicates normal value after warmed up the
equipment.
Note: At the end of LCT operation log out from LCT menu bykeying "99" and then exit from the communication
software. In case if you have exit from the communicationsoftware without logging out from LCT, repeat connectingand disconnecting of the RS 232C cable once to reset.