pasl manual trp equipment description(english 060308)

8/13/2019 PASL MANUAL TRP Equipment Description(English 060308)

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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

1-2

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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ROI-S04605 GENERAL

1-3

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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GENERAL ROI-S04605

1-4

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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FUNCTIONAL OPERATION ROI-S04605

2-2

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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2-3

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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2-5

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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FUNCTIONAL OPERATION ROI-S04605

2-6

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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OPERATION ROI-S04605

3-2

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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ROI-S04605 OPERATION

3-3

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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OPERATION ROI-S04605

3-4

4 pages

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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MAINTENANCE ROI-S04605

4-2

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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4-3

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

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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4-5

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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4-6

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


2. Alarm/Status

3. Inventory

00. Menu

99. Exit

Select item No. :


TX power : 4.33V (-1dB)

RX level : 2.98V (-46dBm)


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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4-7

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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4-8

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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4-9

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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4-10

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.


Screwdriver

(b) Procedure

Step Procedure



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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4-12

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.




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.

pasl manual trp equipment description(english 060308)

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