newwtx2[1].4 02 digital microwave system

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WTX2.4-02Digital Microwave System

Dec. 8, 06



Table of contents

A. Foreword .. .................................................................................................................. 6

1 - Structure of manual.. .................................................................................................... 7

2 - Safety instructions.. ...................................................................................................... 7

3 - List of abbreviations .. ................................................................................................... 9

B. Description ... ............................................................................................................ 10

1 - General description... .................................................................................................. 11

2 - Feature ... .................................................................................................................... 11

3 - System Configuration... .............................................................................................. 12

3.1 - RF channel frequency arrangement ... ................................................ 12

3.2 - Unprotected Configuration... ............................................................... 12

4 - Description of units ... ................................................................................................. 13

4.1 - The Modem Unit ... .............................................................................. 13

4.2 - The Transceiver Unit... ........................................................................ 16

5 - Technical Parameters... .............................................................................................. 19

5.1 - System Transmitter... .......................................................................... 19

5.2 - System Receiver... .............................................................................. 19

5.3 - Radio branch system... ....................................................................... 19

5.4 - Base-band Interface ... ........................................................................ 20

5.5 - Auxiliary interface (optional)... ............................................................. 20

5.6 - Alarm And Remote Alarm... ................................................................. 20

5.7 - Power ... .............................................................................................. 20

5.8 - Environmental Condition... .................................................................. 21

5.9 - Dimension... ........................................................................................ 21

5.10 - MTBF... ............................................................................................. 21

C. Installation... ............................................................................................................. 24

1 - Delivery... ................................................................................................................... 25

1.1 - Checking the configuration ... .............................................................. 25



1.2 - Labels on the boxes... ......................................................................... 25

1.3 - Storage ... ............................................................................................ 26

1.4 - Before Installation Task List ... ............................................................. 26

2 - Indoor part installation... ............................................................................................. 30

2.1 - Installation ... ....................................................................................... 30

2.2 - Unpacking... ........................................................................................ 31

2.3 - Installation The Equipment ... .............................................................. 32

2.4 -Signal lines ... ....................................................................................... 36

3 - Outdoor part installation ... .......................................................................................... 42

3.1 - Antenna installation... .......................................................................... 42

3.2 - Antenna connection ... ......................................................................... 44

3.3 - Transmission Line Installation... .......................................................... 45

3.4 - Equipment grounding... ....................................................................... 47

4 - System testing ... ........................................................................................................ 48

4.1 - Testing ... ............................................................................................. 48

4.2 - BER (Bit Error Rate) testing... ............................................................. 51

D. Operation and configuration... .................................................................................. 52

1 - Instruction ... ............................................................................................................... 53

1.1 - Note... ................................................................................................. 53

1.2 - Equipment front panel Instruction ... .................................................... 54

1.3 - Standby page... ................................................................................... 56

2 - Menu operation... ....................................................................................................... 57

2.1 - Introduction... ...................................................................................... 57

2.2 - State Menu ... ...................................................................................... 58

2.3 - Setup Menu ... ..................................................................................... 73

3 - Menu structure ... ........................................................................................................ 85

E. Maintenance... .......................................................................................................... 86

1 - Preventive Maintenance ... ......................................................................................... 87

1.1 - Routine Maintenance... ....................................................................... 87



1.2 - Routine Checking Of Operation Conditions ... ..................................... 87

1.3 -Test on the measurement point ... ........................................................ 87

1.4 -The supervision ... ................................................................................ 87

1.5 - Keeping maintenance log ... ................................................................ 88

2 - Corrective maintenance ... .......................................................................................... 88

3 - Analyzing Modem Unit alarm indicators ... .................................................................. 88

3.1 - Using the LCD on Modem Unit to trace alarms ... ............................... 89

3.2 - Using the LCD on MODEM Unit to trace alarms... .............................. 91

4 - System Troubleshooting and maintenance ... ............................................................. 94

4.1- Tx Troubleshooting and maintenance:... .............................................. 94

4.2 - RX troubleshooting and maintenance... .............................................. 97

4.2 - RX troubleshooting and maintenance... .............................................. 98

4.3 - E1 I/O interface troubleshooting and maintenance:.... ...................... 101

4.4 - Troubleshooting and maintenance of monitor and display keyboard 102

4.4 - Troubleshooting and maintenance of monitor and display keyboard 102

5 - 2.4GHz Transceiver Unit troubleshooting and maintenance ..................... ............... 105

5.1 - Power troubleshooting and maintenance..........................................105

5.2 - Troubleshooting and maintenance of display and inspection............ 106

5.3 - Tx troubleshooting and maintenance................................................109

5.4 - Troubleshooting and maintenance of no Rx gain.............................. 110

5.5 - Troubleshooting and maintenance of LO in trouble .......................... 112

6 - Troubleshooting and maintenance of Modem Unit....................................................113

6.1 - ALM analysis .................................................................................... 113

6.2 - Troubleshooting and maintenance of IF Tx alarm (TIF [ALM]).......... 115

6.3 - Troubleshooting and maintenance of 2M code input alarm IN1~4

[ ALM] .................................................................................................... 116

6.4 - Troubleshooting and maintenance of Rx IF alarm (RIF [ALM]) ...... 116

6.5 - Troubleshooting and maintenance of Rx de-modulation alarm (SYN

[ALM] / FLS [ALM])................................................................................. 117



6.6 - Troubleshooting and maintenance of EOW ...................................... 119

6.7 - Troubleshooting and maintenance of display and monitoring........... 120

F. Service ................................................................................................................... 121

1 - TECHNICAL SUPPORT......................... ..................... ...................... ..................... .. 122

2 - WARRANTY ............................................................................................................ 123

Appendix 1 - List of application alarms...................... ..................... ...................... ......... 124

Appendix 2 - RX/TX level and Voltage corresponding graph ..................... ................... 125



A. Foreword



1 - Structure of manual

This manual provides for users a sound knowledge of how to operate and install

microwave links.

With it, you should quickly be able to operate the equipment. It is not intended to replace

the training services that we provide for your particular needs.

The manual is divided into seven sections followed by appendixes and index.

Foreword

Description

Installation

Operation and configuration

Maintenance

Service

Appendixes

2 - Safety instructions

2.1 - General rules

The following general safety precautions must be observed by the installer and the

operator. We assume no liability for the customer’s failure to comply with these

requirements.

Ground the equipment: for safety equipment, ground the equipment by joining the

station ground wire to the equipment ground terminal.

Do not operation the equipment in an explosive, dusty, dankish and heavy airflow

atmosphere or in presence of flammable gasses or fumes.For protection against fire: make use of fuse of the same current rating and type.

Dangerous voltages: users must not remove equipment covers or shields. The

installation and maintenance procedures described in this manual are for use by

service-trained personnel only.

Do not operate equipment in the way which may make the equipment damaged:

Ensure to return back to the standby page after completion of operation.

User’s operation is limited to [1.T/R State] and [2.M/D State]. Other items are set



by the technician or the manufacture. To ensure normal operation of the

equipment, please do not do any change.

Whenever it is possible that the safety protection features built into this equipment

have been impaired, isolate from the power supply and do not use the

equipment until safe operation will be verified by service-trained personnel. If

necessary, return the equipment to the manufacturer for service or repair.



3 - List of abbreviations

MNEMONIC ENGLISH MNEMONIC ENGLISH

AGC Automatic Gain Control HDB3High Density Binary 3

Code

ALC Automatic Level Control

FEC Forward Error Correction LED Light Emitting Diode

BER Bit Error Rate IF Intermediate frequency

QPSKQuadrature Phase Shift

KeyingRF Radio Frequency

LO Local Oscillator TX Transmitter

RX Receiver FD Frequency Diversity

SD Space Diversity T/R State Transceiver Unit state

EOW Engineering Order Wire Rx State Receiver state

M/D State Modem Unit state

TX State Transmitter state

EOW SetupEngineering order wire

number SetupH High power

CAP Setup Capacity Setup L Low power

M Medium power T Capacity 3E1

Q Capacity 4E1 S Capacity 1E1

D Capacity 2E1



B. Description



1 - General description

WTX2.4-02 is a family of digital point-to-point microwave radio system, designed to

satisfy various digital transmission needs of public and private networks for a large range

of applications.

WTX2.4-02 family covers the frequency range from 2300 2500MHz

It covers the following capacity:

1×2Mb/s 2×2Mb/s 4×2Mb/s

It is today used worldwide in:

Cellular networks

Fixed access networks for Public Telecom, including:

Infrastructure of Wireless IP networks

Direct complementary point-to–point access in LMDS networks

Private networks

Utility networks. Security/Defense networks

2 - Feature

QPSK Modulation and coherent demodulation.

The spectrum efficiency is optimized with the use of QPSK modulation with

digital filtering.

The modulation-demodulation (Modem Unit) with forward error correction (FEC)

to improve the availability and quality of the radio link.

A comprehensive supervision is also available to monitor the radio link

operation and its maintenance.

Transceiver unit is divided into several separated modules. such as frequency

synthesize oscillator, power amplifier, high quality LNA (low noise amplifier) andTX-Rx mixer, etc.



The Modem Unit is designed with the use of a large number of large-scale

integrated circuits and FPGA devices. The performance and reliability is

furthermore increased by it.

WTX2.4-02 is fully compliant with the international requirements (ITU-R) and

national regulations. Including 2Mb/s interface, spurious emissions, etc.

Small dimensions of the 19´–1U for Transceiver Unit and Modem Unit allows for

easy installation and maintenance in standard 19´racks, and save a lot of

space.

A 64kbit/s digital service telephone channel, interface as RJ11 (two-wire)

3 - System Configuration

3.1 - RF channel frequency arrangement

RF channel frequency arrangement of WTX2.4-02 is compliant with the international

requirements (CCIR, REC.933), the frequency arrangement list is hereafter. Please

consult factory for other frequency arrangement requested.

Frequency

Range

(MHz)

Max.

Capacity

(Mb/s)

Central

frequency

(MHz)

Channel

numbersTX/Rx separations (MHz)

2300~2500 4×2.048 2394 20 94

f t =f 0-90+4n

f r =f 0+4+4n

f t /f r :RF transmitter frequency/RF receiver frequency

f 0: central frequency 2394MHz

n: channel

3.2 - Unprotected Configuration

WTX2.4-02 unprotected (1+0) radio terminal is made up of the following elements.



Elements Quantity

Transceiver Unit 1

Modem Unit 1

4 - Description of units

4.1 - The Modem Unit

4.1.1 - The Modem Unit consists of the following sub unit (refer to Figure 2 )

Multiplex/demultiplex

Bit insertion/extractor

FEC code/decode

QPSK modulator/demodulator

Display, control and communication

Power supply

4.1.2 - Service bit including

One 64kbit/s signal for EOW

One 64kbit/s signal provides users with low speed data channel (optional).

4.1.3 - Description of Function

Modem Unit change base band signals and auxiliary data signals from exchanger or

digital terminal into combined serial signals by multiplex, these combined signals forms

Modem

UnitE1 I/O

Transceiver

Unit

Figure 1 Block diagram of 1+0



I,Q parallel signals and clocks after FEC coded and thus to complete QPSK modulation.

Transceiver Unit converts the microwave signals back to QPSK signals. QPSK signals

are sent to Modem Unit through IF cable and then are demodulated into I, Q signals, the

clock is also recovered. The IF Modem Unit recovers serial combined signals after

finishing decoding these signals respectively into 1×2Mb/s, 2×2Mb/s, 4×2Mb/s

base-band signals and auxiliary data according different signals, and changes them back

again into standard base-band signals to output.



Figure 2 Block diagram of Modem Unit

Multiplex Bit Insertion FEC code QPSKModulator

IF

Demultiplex Bit Extractor FEC decode

n×E1input...

Powersupply

12V

5V

48V LCD Display and Control

3× 64kb/s service bit n×E1 output...

12V

QPDe

I

Q

I

Q



4.2 - The Transceiver Unit

4.2.1 - The Transceiver Unit consists of the following sub unit (refer to Fig 7)

Transmitter:

TX amplifier

TX local oscillator

Up-converter(mixed)

Single-band filter

Power amplifier

TX channel filter

Receiver

RX channel filter

LNA

Single-band filter

Down-converter(mixed)

Rx IF Amplifier

AGC

Rx local oscillator

4.2.2 – function description

The TX IF from the Modem Unit is up –converted in order to provide the final transmission

frequency. The output power is continuously monitored through the control and fed to the

modem Unit.

The microwave signal from the modem Unit is amplified at first, through a LNA and then is

down-converted. The resulting IF is amplified and is finally fed to the Modem Unit.

When the TX IF signal from the Modem Unit loses, the centre frequency of RF will export

from RF port.



19

5 - Technical Parameters

5.1 - System Transmitter

Output power: +17 +26dBm adjustable (accuracy ±1dBm)

IF frequency: 70MHz ± 7KHz

IF input signal level: 0dBm ±1dBm

Modulation mode: QPSK

Error correction coding: k=7 3/4 mode

Tx local oscillator frequency stability ≤ ±10 ppm

Spurious emission: ≤ -30 dBm

5.2 - System Receiver

Noise figure: ≤ 3dB (from Receiver input)

Normal receiver signal level: -40dBm

Threshold: ≤ -86 dBm (error rate 1×10 -6)

IF frequency: 70MHz

IF output level: 0 dBm±1dBm AGC dynamic range:>50dB( -35 -86dBm)

Modulation mode: DCQPSK

Error correction coding: FEC coding

Rx local oscillator stability: ≤ ±10 ppm

5.3 - Radio branch system

Antenna, feeder interface: N type (female)

Impedance: 50 Ω

Return loss:>17dB

Direction insertion loss: ≤ 3dB (f o ± 8.5MHz)

Branch filter: 7-resonator ceramic filter



20

5.4 - Base-band Interface

Capacity: 1×2048kb/s, 2×2048kb/s, 4×2048kb/s

Frequency tolerance: ± 50 ppm

Line code shape: HDB3

Interface characteristics: impedance, level, code type compliance with

ITU-TG.703

Jitter characteristics compliance with ITU-TG.823 G.921

Cable length allowed: 0 150m

Socket: DB25 or BNC

5.5 - Auxiliary interface (optional)

Data interface: RS232

Data rate: 2.4kb/s, 4.8kb/s, 9.6kb/s, 19.2kb/s

EOW(Engineering Order Wire) interface: RJ11

EOW: 64kb/s PCM mode

EOW: dialing for sel-call mode

Subscriber line extension interface

Center order terminal is connected directly to with exchanger

Subscriber terminal is connected to telephone

Ethernet data interface: 10 BASE, rate 1.92Mbps

Operational mode: occupies an E1 interface (selectable from 1 to 4 E1)

5.6 - Alarm And Remote Alarm

Alarm led

Alarm led illuminating indicates local equipment generating alarm signals.

Remote alarm led

Illuminating indicates remote equipment generating alarm signals.

5.7 - Power Input voltage: -48V DC (allowed variation range -36 -72 V DC )



21

Modem Unit output voltage: +5V, +12V, -12V

Transceiver Unit output voltage: +12V, -12V

Switching output voltage: +12V, +5V, -5V

Consumption: 35W

5.8 - Environmental Condition

Working temperature:

5 40ºC : All technical index are guaranteed

0 45ºC : Normal operation is guaranteed.

Storage temperature: -40 +55ºC

Relative humidity: no more than 85%

Note: Storage area must be well ventilated, dry, without erosion gas

5.9 - Dimension

Modem Unit, Transceiver Unit dimension:

Width × high × length =482.6mm (19’) × 44.45mm × 320mm

5.10 - MTBF

MTBF ≥ 100000 hours



22

Digital Microwave Radio System Hs

No Item Specs

1 operation frequency range 2300 to 2500MHz

2 Tx/Rx local frequency stability ±10ppm3 output power typical >25 dBm

4 system gain 111dB5 RF input level typical -40dBm6 AGC dynamic range More than 50dB -35~-86 dBm 7 transmission capacity 4×2.048mbps8 Demodulation Coherent demodulation

9

base-band interfacebit rate

interface codesignal levelimpedance

ITU-T G.7032.048mbps ±50ppm

HDB3VO-P =2.37V75 ohm unbalanced

10 service channel 1 EOW 2-WIRE

11

voice frequency channelfrequency bandoutput leveloutput impedance

ITU-T G7120.3 to 3.4KHz-6dBm~-35.5dBm600 ohm, balanced

12 measurement points

Tx powerRX level (Indication range: -35dBm~-86dBm)Tx local oscillatorRx local oscillatorIntermediate Frequency 70MHz±20ppm(BNC)

13 channel space 8MHz14 Branch filter parameters refer to Figure 4 15 Intermediate Frequency 70MHz16 IF level 0dBm±1dB17 Threshold -86dBm BER ≤ 1×10 -6

18 power supply -48VDC(-36 to -72VDC)

19 power consumption Approx 100w (1 station HS configuration)

20

temperature rangeguaranteed operationworkable operationtransport and storage

5 +40 -5 +45 -25 +55

21

relative humidityguaranteed operation

workable operationtransport and storage

Less than 90% at +45

Less than 90% at +50 Less than 90% at +50



24

C. Installation



25

1 - Delivery

When you receive the equipment in its packaging:

Check the condition of the packaging.

If damaged, make your reservations known to the carrier as quickly as possible.

1.1 - Checking the configuration

As a rule, the packaging of equipment is

The hop equipment is enclosed in the wooden boxes, in other words, two paper

boxes enclosed; one end equipment is enclosed in each paper box. The materialness is

as following:

No. Item Quantity

1 Modem 1

2 Transceiver 1

3 E1 I/O cable kit 1

4 Power connector kit 15 Fuse 3 6 IF connection 2 7 50 Ω cable (N) 18 Telephone Set 19 Technical handbook 1

10 Test report 1

1.2 - Labels on the boxes

TRANSCEIVER UNIT

TX 2418MHz RX 2324MHz

CHANNEL 09 NO. R

(2)(1)

(3) (4)



26

(1) TX Frequency of the Transceiver Unit

(2) RX Frequency of the Transceiver Unit

(3) Channel of the Transceiver Unit

(4) Serial number of the equipment

1.3 - Storage

If installation is to be deferred, the type of packaging will define the equipment storage

conditions:

Cardboard boxes should be warehoused indoors, in a dry, well aired room.

Wooden or plywood boxes may be stored outdoors, provided that they are protected

from rain and the sun’s rays.

1.4 - Before Installation Task List

There are several tasks that should be accomplished prior to installing the system. This

section briefly describes the following:

- Site selection

- Line-of-sight and path clearance determination

- Anticipated RSL calculation

- Fade margin calculation

- Availability calculation

- Frequency plan determination

- Power supply planning- Antenna purchase

DESCRIPTION No. QTY

Modem M 1

Transceiver R 1

Appendix 1



27

NOTE:

Only directional antennas should be used with the system. These can be grid or solid

parabolic antennas (minimum 2 foot – 0.6 meter). Flat panel antennas are also acceptable

if the beam width is kept to a minimum.

1.4.1 –Site Selection Requirements

The system site must have:

- Access to the appropriate power

- Close proximity to the telephone you wish to interconnect

- Line-of-sight to the other location with adequate clearance

- Location for mounting the antennas

1.4.2 – line-of –sight and path clearance guidelines

The system will not operate properly unless they have line-of-sight between their

corresponding antennas. The transmission will not pass through trees or other obstacles.

Factors to consider include:

- Earth curvature

- Future growth of trees

- Height of building

In addition to the line-of-sight requirement, a well-engineered path will also have

additional path clearance to allow for signal loss due to patial obstructions, atmospheric

ducting and ground reflections. To maximize radio reception, 0.6 times the first Fresnel

zone should be calculated and this distance added to the path clearance (in addition to or

buildings).

1.4.3 – RSL calculation and link budget

The received signal level (RSL) can be estimated using the following formula:RSL(dBm) = P out – FL 1+G 1+G 2 – FL 2 - Lp



28

Where: P out is the transmitter output power ( in dBm)

FL1 is the feeder loss of the transmit side ( in dB)

G1 is the gain of the transmit antenna ( in dB)

G2 is the gain of the receive antenna ( in dB)

FL2 is the feeder loss of the receive side ( in dB)

Lp is the path loss, defined by:

Lp(dB)=96.6 + 20log 10 F + 20 log 10 D

Where: F = frequency in GHz

D = distance of path in miles

The link budget is very important for determining any potential problems during

installations. If you have calculated the expected RSL, you can see if it has been achieved

during installation, and troubleshoot if necessary.

1.4.4 – Fade Margin Calculation

The fade margin is the difference between the actual received signal and the system’s

threshold. Using the formula provided in section 1.4.3, the anticipated RSL can be

calculated. Compare this RSL to the specified threshold of the system and calculate the

fade margin as the difference between the two signal levels.

Dispersive fade margin is another factor that many microwave path engineers may use to

plan their link budget. For the system, the dispersive fade margin is in excess of 45dB and

therefore is not a determining factor in path planning. This excellent dispersive fade

margin performance is important because the RF signal has considerably wide bandwidth.

1.4.5 – Availability Calculation

Availability of the microwave path is the measure of the time that the link will operate

without producing an excessive BER due to multipath fading. In the absence of direct

interference, availability is affected by the following:- Path length



29

- Fade margin

- Frequency

- Terrain (smooth, average, mountainous)

- Climate (dry, temperate, hot/humid)

Depending on the type of traffic carried over the link, the system designer may wish to

design for a specific availability. For example, if the data or voice traffic that is carried by

the radio is critical then it may be designed for a very high availability. To improve

availability, for example, the fade margin can be increased by making the path shorter, or

by using higher gain antennas in conjunction with lower loss feeders(by using high quality

transmission line or shortening feed length).

1.4.6 – Frequency plan determination

When configuring system in a hub or repeater configuration, careful engineering of the

system frequency plans and antenna locations should be performed in order to minimize

potential interference between the nearby systems. As a rule of thumb, do not place

identical frequency plan system (e.g. two “A” channel systems) at the same site. In most

cases, it is desirable to use a different frequency plan (e.g. A versus B). However, with

careful engineering, placing more than one system of the same frequency channel plan at

the same site can be accomplished. In fact, the frequency plan is designed to allow

complex hub configurations that may require reusing the same frequency plan. When

designing these types of configurations, antenna size and antenna location are critical. If

Identical channel plans must be used at the same site, the system channel (e.g. A1 and

A2) should be used at a site to minimize interference. Using alternate channels (e.g. A1

and A2) is less likely to be successful (and therefore not recommended) due to the high

level of transmitter to receiver isolation required from the antenna system.

1.4.7 – Power Supply Planning

The system must have access to a supply of appropriate power. Typically negative ground48 volt supply is used. For DC, be sure the cable is of sufficient gauge to carry the



30

necessary current.

Before installing the system, plan for the continuous power consumption needs in

accordance with the specifications. It is also wise to plan for backup power for critical

communication circuits (including the system). Backup power allows the system and

associated equipment to continue operation when primary power is interrupted.

1.4.8 – Antenna Planning

Using the path planning tools, proper antenna size can be determined which will yield the

desired path performance. In general, the larger the antenna that is used with the system,

the better the link will perform. Larger antennas have narrower beamwidth and higher gain,

which will yield better link performance (higher fade margin, better availability) and

improve immunity to interference (due to the smaller beamwidths). However, larger

antennas are more costly to purchase and difficultly install than smaller antennas, in some

cases requiring special equipment for installation. All of these factors should be taken into

consideration when selecting antennas.

2 - Indoor part installation

The following tools may be required for the installation:- Cross tip screwdriver- Small spanner- Big spanner

- Digital Voltmeter

2.1 - Installation

Installation work begins with unpacking and should follow the steps blow.

Step 1. Unpacking

Step 2. Installing the equipment

Step 3. Connecting the cables



31

2.2 - Unpacking

2.2.1 -Check the shipment container for damage, if not, put up unpacking, pay

attention not to damage the contents or the container.

2.2.2 -Checking The Contents

When unpacking, check each of the contents against the packing list to find missing or

damaged components, keep shipment container for possible re-use until all the contents

are checked to be in satisfactory conditions.

2.2.3 - Labels on the equipment

2.2.3.1 - Labels on the Transceiver Unit

(1) Name of the equipment

(2) TX Frequency of the Transceiver Unit

(3) RX Frequency of the Transceiver Unit

(4) Channel of the Transceiver Unit

(5) Serial number of the equipment

R 009

R: Transceiver Serial number of

the equipment

TRANSCEIVER UNIT

TX 2418MHz RX 2324MHz

CHANNEL 09 NO. R009

(1)

(4)

(2) (3)

(5)



33

rack-mount-brackets on both side of the main body cabinet, using the cabinet mounting

bows, then, install the equipment on the rack.

2.3.2.1-Rack installation sketch: including M8 bolt, Ф 8 nut Ф 8 spring washer Ф 8 flat

washer( see the following figure), upper bracket lower bracket column

2.3.2.2 - The equipment mounting pole installation sketch

Mounting pole is installed on right and left side of equipment, see the following figure:

M8 bolt

Ф8 nutФ8 spring washerФ8 flat washer



34

Mounting pole is installed at the middle (or front) of right and left side of equipment

according to demand. Recommended installation methods are that it is installed at the

middle of the equipment with M3 bolt .

The equipment is installed on the rack.(see the following figure)

M3 bolt



35



36

2.4 -Signal lines

2.4.1 E1 I/O Cable kit

E1 signal I/O Cable kit is connected with E1 I/O interface on the modem Unit

(connection kit refer to the following page).

Serial number Name

1 Cable SYV-75-2-2

2 Cable socket BNC-KY32Y-1

3 DB25A/M



37

E1 I/O Cable kit DB25A/M Port Pin Assignments

DB25A/M Connector Pin Number Signal Name

1 E1out1

2 GND

3 E1out2

4 GND

5 E1out3

6 GND

7 E1out4

8 GND

9 NC

10 NC

11 NC

12 NC

13 NC

14 E1IN1

15 GND

16 E1IN2

17 GND

18 E1IN3

19 GND

20 E1IN4

21 GND

22 NC

23 NC

24 NC

25 NC



38

connecting with modem unit



40

2.4.3 IF connection: the cable which connects the Modem Unit with the Transceiver

Unit

Serial number Name

1 Cable socket BNC-75J4C

2 Cable SYV-75-2-1



41

2.4.9 EOW telephone handset connection

Note: telephone handset must be connected with the modem unit



42

3 - Outdoor part installation

3.1 - Antenna installation

The antenna installation consists of mounting the antenna on the tower, building roof or

other location that provides line –of sight path clearance to the far location. In general,

antennas smaller than 4 feet diameter are not recommended for urban areas due to their

higher interference susceptibility.

Antennas should be ordered with a suitable mounting kit specific to the site requirements,

for example specifying round or angle tower leg adaptors, or a roof tripod.

If wind-loading may be a problem for an outside mounted antenna, a grid antenna can

reduce the wind load compared to a solid dish, although the antenna discrimination

capability, for example at hub locations, will be degraded. However, vertical vs. horizontal

discrimination, if required, may be improved by using grid antennas.

The antenna must be very rigidly mounted, with adequate room for azimuth and elevation

adjustment.

The antenna polarization must be the same at both ends of the link, either vertical or

horizontal.

In general, antenna mountings require a support pipe to which upper and lower support

brackets are attached with U bolts. The antenna and optional elevation and azimuth

adjustment rods are then mounted onto the support brackets. The whole structure must

be adequately grounded, in case of lightning. The antenna system must always be

installed according to the manufacture’s instructions.



43

Mounting Pole dimension: 76mm or 114mm

76mmor

114mm

Figure 1 Mounting Pole dimension



44

Fitting the top “U bolt” on the 114 mm Ø tube

1) Offer the threaded “U” bolt (M10) item on the 114 mm Ø tube.

2) Fit casting on the bracket.

3) Fit the washers, item and nuts (HM10) item on the threaded bracket.

4) Tighten the nuts using a 17 mm flat wrench and the plate will be distorted.

3.2 - Antenna connection

The equipment is equipped with an N-type female connector at the antenna port,

“ANTENNA” at the rear of the shelf. A jumper cable (or “pigtail”) fitted with two N-type male

connectors should be used to connect the antenna port with the antenna transmission

line.

A low loss 50 ohms cable (for example 1/2 ″, 7/8 ″foam or air coax ) is recommended for the

antenna transmission line between the top of the rack and the antenna. The return loss

presented by the transmission line at the top of the rack should be as possible (20 dB,

minimum recommended). The length of the antenna transmission line should be kept as

short as possible (to minimize losses).



45

Antenna Installation sketch

3.3 - Transmission Line Installation

The co-axial transmission line (cable) may be prepared by first being cut to the

approximate length allowing some excess and an N-type male connector installed on the

antenna end (expect for large or high performance antennas with 7/8 ″EIA flange

U boltsGrid Antenna

Casting

antislip baffle

Plumb pull pole

Feed

Jumper cable

Feeder cable



46

connectors).

The cable is then pulled through the cable ducts, trays or conduit (as required) to the

antenna, while being careful not to kink or damage the cable in any way.

The cable should be supported in a tray on horizontal runs and by hangers on vertical

runs. Hangers should be spaced according to the manufacturer’s instructions.

The cable should be grounded using a special grounding kit that attaches to the outer

copper conductor. Grounds must be installed at the antenna, at the bottom of the tower (if

applicable) and where the transmission line enters the building. Long cable runs should be

grounded every 100 feet. In case of high lighting incidence, lightning dissipaters should be

attached to antennas. In addition, co-axial, in-line, spark-gap type, lightning suppressors

should be added at the bottom of the co-ax cable.

After installation, the cable is terminated with a second N-type male connector attached at

the equipment end.

Prior to operation, the electrical integrity of the cable and connectors can be checked with

a simple DC detector between the center conductor and outer conductor.

The transmission line should ideally be connected directly to the antenna at one end and

to the RF port of the equipment at the other end. However, a jumper cables may be

required to avoid sharp bends in the transmission line or undue stress on the connection.



47

3.4 - Equipment grounding

Feeder grounding; cut the outer layer of the feeder cable about 10cm length, expose themetal part. Connect one end of the grounding kit to the metal part and seal with tape,connect the other end to protected ground.

Necessary only if

D>80m

D

In door

Grounding kit

10cm



48

4 - System testing

4.1 - Testing

4.1.1 –install station A with the antenna facing to station B.

4.1.2 –install station B with its antenna facing to station A.

Check the system is well grounded and the polar are correctly connected before

powering the system. The standby page is displayed as Fig 1

Fig 1

Fig 2 will be displayed on the screen seconds later.

Fig 2

Because the antenna is not fine adjusted, the screen may display ”RX: - LOW” in this

case, the antenna should be readjusted according to level graph.

Transceiver

Modem Unit

Transceiver

Modem Unit

Station A Station B

SYS Initialize

Loading……...

TX: + dBm [NOR]

RX: - dBm [NOR]



49

The procedure of adjustment is as following

1. Connect the red probes of multimeter (set in DC range) to pin 4 of the DB9 head

attached to the equipment. pin 9 is ground.

9

1

6Pin

Pin 1

Pin 6

(voltage) (voltage)



50

The best RX level of the equipment is –40dBm. Recommend to set normal RX

level between –55 ~ -40dBm. The respective RX level can be easily checked out

according to voltage graph.

2. Fix station B antenna, adjust station A antenna, slowly adjust elevation. Observe

AGC voltage while adjusting to make it be optimum. Then adjust azimuth make it

reach maximum. Adjust station B antenna the same way, after antennas are well

adjusted. Look at the LCD screen of the modem Unit and check that if TX power

and RX level indication are normal, if there is any warning on the Modem Unit

panel. When everything is normal, perform bit error test.(refer to Bit Error Test).

After adjusting the antenna, if AGC level is very low, on the LCD screen, RX Low

will be displayed. It may because too much loss of space or blocking space.

Increasing the antenna diameter and TX power may resolve the problem. If there

is blocking object, increase the height of the antenna or change the station

location to avoid to be blocked.



51

4.2 - BER (Bit Error Rate) testing

Bit error rate (BER) testing is the preferred way to evaluate a radio link’s performance. It

can be performed from point -to-point or in loopback mode (which tests both directions of

the radio path). Figure 1 illustrates a typical BER test configuration for loopback testing

(which may include the radio’s path instead of in-line attenuators).

When performing BER testing, make sure of the following step:

a) Connect BER tester to data input/output connector(s).

b) Connect data input/output of the remote equipment with the cable.

Remark: The BER tester pattern must be set up as 2 15-1, and test code must be set

up as HDB3.

Figure 1 Loopback BER Test Configuration

WTX2.4-02 WTX2.4-02

BER tester

RF RF

Antenna Antenna



52

D. Operation and configuration



53

1 - Instruction

1.1 - Note All operations are based on systems work normally without warning. If there is a

warning or abnormality on screen, please refer to the maintenance section.

All legends with under line are defaulted cursor position.



54

1.2 - Equipment front panel Instruction

1.2.1 - Modem Unit front panel

① Power LED: Indicates status of -48VDC on the circuit board. Power LED illuminating

indicates -48VDC is present on the board.

② Power switch: ON means power on the circuit board. OFF means no power.

③ LCD screen

④ EOW: Engineering order wire interface.

⑤ Alarm LED: Alarm LED illuminating indicates LOCAL equipment (including Modem

Unit and RF Transceiver Unit) generating alarm signals.

⑥ RMT Alarm LED: Lighting indicates remote equipment (including Modem Unit and RF

Transceiver Unit) generating alarm signals.

⑦ 70MHz: IF carrier wave (70 MHz±3KHz, 0dBm±1dB).



55

1.2.2 – Transceiver Unit front panel

① Power LED: Indicates status of -48VDC on the circuit board. Power LED illuminating

indicates -48VDC is present on the board.

② Power switch: ON means Power on the circuit board. OFF means no power.

③ TLO: TX local oscillator frequency measurement point (-6dBm±2dB).

④ RLO: RX local oscillator frequency measurement point (-6dBm±2dB).

⑤ DETECT: Detect interface (refer to Appendix 2 ).



56

1.3 - Standby page

After installation by technician, check the system is well grounded, power supply is

correctly connected, then power the system, standby page (Fig 1) will be displayed on the

LCD screen of Modem Unit.

Fig 1

The system is initializing, all system parameters are being loaded, please wait. The

standby page will be displayed seconds later. The following describes different standby

pages according to respective equipment.

1.3.1 - Modem Unit standby page

Fig 2

On this page, present TX value and alarm, RX value and alarm are displayed on the same

link equipment .

1.3.1.1 - Tx and Rx

Tx: Output power of Transceiver Unit.

the normal display range is 17 26 dBm.

If TX value is less than 15 dBm, “TX: loss” is displayed in the first line.

Rx: Receiver signal level of Transceiver Unit.

the normal display range is -35 -86 dBm.

If RX value is less than -88 dBm, “RX: low” is displayed in the second line.

SYS Initialize

Loading……...

Tx: + 25 dBm [NOR]

Rx: - 65 dBm [NOR]



59

Fig 6

Fig 6 indicates Unit has already communicated with the local equipment ( or link), the local

equipment (or link) status including Modem Unit and Transceiver Unit can be checked.

2.2.1 T/R State Menu

The T/R State Menu is used to check TX power, RX level, Tx power alarm and RX level

alarm of the Transceiver Unit, below is the different status of the local equipment (or link).

Put the cursor on “1” of the first line by moving “Right” keys. Then select the “Enter” key to

call up the T/R State Menu , Fig 7 is displayed on the screen.

Fig 7

1. T/R State

2. M/D State

1.1 Tx Level

1.2 Rx Level



60

The T/R State menu includes 4 sub-menus: TX power, RX level, Tx power alarm and RX

level alarm of the Transceiver Unit. Moving the “Up/Down” keys to get the following 4

menus

"1.1 Tx Level "

"1.2 Rx Level "

"1.3 Tx State "

"1.4 Rx State "

2.2.1.1 Tx Level

The menu is used to show the current TX power of the Transceiver Unit. Put the cursor on

the "1.1 Tx Level " by moving the “ Up/Down” keys, then select the “Enter” key to call

up "1.1 Tx Level " menu, Fig 8 is displayed on the screen.

Fig

Fig 8

The screen shows that the current TX power of the Transceiver Unit is 26dBm.

2.2.1.2 Rx Level

The menu shows the current RX level of the Transceiver Unit. Put the cursor on the "1.2

Rx Level " by moving the “ Up/Down” keys, then select the “Enter” key to call up "1.2

Rx Level” menu. Fig 9 is displayed on the screen.

Fig 9

The screen shows that the current RX level of the Transceiver Unit is 65dBm.

Tx Level

26 dBm

Rx Level

65 dBm



61

2.2.1.3 Tx State

The menu shows the current TX power alarm signal of the Transceiver Unit. Put the

cursor on the "1.3 Tx State " by moving the“ Up/Down” keys, then select the “Enter”

key to call up "1.3 Tx State " menu. Fig 10 is displayed on the screen.

Fig 10

The detailed signals see the following table.

The alarm signal may be switched off during test to avoid wrong decision and wrong

operation.

The alarm signals above both have “on” and “off” states. Put the cursor onto the alarm

signals required and press the “Enter” key to call up the page of Fig 12 (for example).

For a instance of “TLO” put the cursor on the first line, then press the “Enter” key to call

up the page of Fig 11.

Fig 11

Name Meaning State

NOR: normalTLO Tx local oscillator alarm

ALM: alarmNOR: normal

TPWTx power alarm, if Tx power is less than4dB of setup value, alarm appears. ALM: alarm

1.3.1 TLO [NOR]

1.3.2 TPW [NOR]

1.3.1 TLO [ On ]

Opt. [ On Off ]



63

2.2.1.4 Rx State

The menu is used to show the current RX level alarm signal of the Transceiver Unit. Put

the cursor on the "1.4 Rx State " by moving the “ Up/Down” keys, then select the

“Enter” key to call up "1.4 Rx State " menu. Fig 15 is displayed on the screen .

Fig 15

The details see the following table.

All signals above have “on” and “off” state. Put the cursor onto the alarm signals required

and press the “Enter” key to call up the page of Fig 16(for example).

Take “ RLO ” as an example put the cursor on the first line, then press the “Enter” key to

call up the page of Fig 17.

Fig 16

The cursor is defaulted on “ On ” of the second line “ Opt. [ On Off ] ”, It may be

selected on “on” or “off” by the “Right” key, and the cursor in the second line will move

accordingly. The brackets in the first line of the screen shows the current switch state of

selected signal, the picture shows the “ RLO ” is turned on, means the “ RLO ” switch is

enable. When signal alarm switch is enable, if signal alarms, the alarm LED willimmediately light on. Please revert back to previous menu, Fig 17 is displayed on the

Name Meaning State

NOR: normalRLO Rx local oscillator alarm

ALM: alarm

NOR: normalRSL

Rx level alarm, if Rx level is less than

-82dBm, alarm appears. ALM: alarm

1.4.1 RLO [NOR]

1.4.2 RSL [NOR]

1.4.1 RLO [ On ]

Opt. [ On Off ]



64

screen.

Fig 17

Now, put the cursor on “Off” by the “Right “key, then press the “Enter” key to close alarm

signal. Fig 18 is displayed on the screen.

Fig 18

Now, signal “ RLO ” is OFF, means the “ RLO ” alarm signal is inhibited,. If there is a “ RIF”

signal alarm, the alarm LED will not light on. Please revert back to previous menus; Fig 19

is displayed on the screen .

Fig 19

1.4.1 RLO [ Off ]

Opt. [ On Off ]

1.4.1 RLO [Off]

1.4.2 RSL [NOR]

1.4.1 RLO [ALM]1.4.2 RSL [NOR]



65

2.2.2 M/D State Menu

The M/D State Menu is used to check alarm signal of the Modem Unit (or link). This

example shows status of the Modem Unit (or link). Put the cursor on the first line by

selecting the “Up/Down” keys, then select the “Enter” key to call up M/D State Menu. Fig

21 is displayed on the screen.

Fig 21

M/D State menu includes two sub-menus: modulate state and demodulate state. See

the following figure.

"2.1 MOD State "

"2.2 DEM State "

2.2.2.1 MOD State

The menu is used to show the current modulation alarm of the Modem Unit.

Put the cursor on the "2.1 MOD State " by moving the “ Up/Down” keys, then select

the “Enter” key to call up "2.1 MOD State " Fig 22 is displayed on the screen.

Fig 22

The details see the following table.

2.1 MOD State

2.2 DEM State

2.1.1 TIF [NOR]

2.1.2 TSL [NOR]



66

All signals above have “on” and “off” states. Put the cursor onto the alarm signals required

and press the “Enter” key to call up the page of Fig 22 (for example).

Take “ TIF” as an example put the cursor on the first line, then press the “Enter” key to

call up the page of Fig 23( for example).

Fig 23


selected “on” or “off” by the “Right” key, and the cursor in the second line will move

accordingly. The brackets in the first line of the screen are showing the current switch

state of the selected signal. On the picture the TIF” is turned on, meaning the switch is

available. When signal alarm switch is enable, if signal alarms, the alarm LED willimmediately light on. Please revert back to previous menu, Fig 24 is displayed on the

Name Meaning State

NOR: normalTIF Tx IF alarm ALM: alarm as described in

section 3.2NOR: normal

TSL Transmitting signal loss ALM: alarm as described insection 3.2

NOR: normal

IN1The first E1 loss alarm. When

capacity is 1E1, the alarm appears ALM: alarm as described in


IN2The second E1 loss alarm. When



IN3The third E1 loss alarm. When



IN4The fourth E1 loss alarm. When


section 3.2

2.1.1 TIF [ On ]

Opt. [ On Off ]



67

screen.

Fig 24



Fig 25

Now, signal “ TIF” is OFF, means “ TIF” signal alarm is inhibited. If there is a “ TIF” signal

alarm, the LED will not light on. Please revert back to previous menu; Fig 26 is displayed

on the screen.

Fig 26

2.1.1 TIF [ Off ]

Opt. [ On Off ]

2.1.1 TIF [Off]

2.1.2 TSL [NOR]

2.1.1 TIF [ALM]

2.1.2 TSL [NOR]



69

All signals above have “on” and “off” state. Put the cursor onto the alarm signals required

and press the “Enter” key to call up the page of Fig 28( for example).Take “ RIF” as an

example put the cursor on the first line, then press the “Enter” key. Fig 28 is displayed on

the screen.

Fig 28


selected “on” or “off” by the “Right” key, and the cursor in the second line will move

accordingly. The brackets in the first line of the screen shows the current switch state of

the selected signal, on this picture, the “ RIF” is turning on, means the switch is available.

When signal alarm switch is available, if signal alarms, the alarm LED will

immediately light on. Please revert back to previous menu, Fig 29 is displayed on the

screen.

Fig 29

Code Name Meaning State

NOR normal2.2.1 RIF Rx IF alarm ALM: alarm

See maintenance sectionNOR normal

2.2.2 ERR Bit error alarm ALM: alarmSee maintenance section

NOR normal

2.2.3 FLSFrame synchronization loss

alarm ALM: alarm

See maintenance sectionNOR normal

2.2.4 RMTRemote terminal alarm

ALM: alarm

See maintenance section

2.2.1 RIF [ On ]

Opt. [ On Off ]

2.2.1 RIF [ALM]

2.2.2 ERR [NOR]



70



Fig 30

Signal “ RIF” is OFF, at present means signal “ RIF” alarm is inhibited, If there is a alarm,

the alarm LED will not light on. Please revert back to previous menu; Fig 31 is displayed

on the screen.

Fig 31

2.2.1 RIF [ Off ]

Opt. [ On Off ]

2.2.1 RIF [Off]

2.2.2 ERR [NOR]



71

2.2.3 Remote state operation

If the user wants to select the remote equipment (or link), he can put the cursor on the

second line by moving the “Right” keys and press the “Enter” key to call up the menu.

Please refer to 2.2.3.1 for the detailed operation see the following figure 32.

“>Remote [ ] ”

Fig 32

2.2.3.1 – Requests remote equipment (or link) state.

Put the cursor on the second line by moving the “Right” keys, then press the “Enter” key.

Fig 33 is displayed on the screen.

Fig 33

Fig 33 indicates Unit is communicating with the remote equipment (or link),

Please wait for few seconds, one of the following two figures will be displayed on the

screen.

Fig 34

Fig 34 indicates Unit has already communicated with the remote equipment (or link), the

remote equipment state (including Modem Unit and Transceiver Unit) can be checked.

Refer to section 2.2.1 and 2.2.2 for the rest operation.

>Local [ ]

>Remote [ ]

Remote state

Waiting ………

1. T/R State

2. M/D State



72

Users may select operation after careful consideration. If users want to keep on operation,

then select the “Enter” key (the cursor is defaulted on”Yes”) to response to the local

request. Fig 35 is displayed on the screen.

Fig 35

Please wait for a few seconds, one of the following three figures will be displayed on the

screen.

Fig 36

Fig 36 indicates Unit has already communicated with the remote equipment (or link), the

remote equipment state (including Modem Unit and Transceiver Unit) can be checked.

Refer to section 2.2.1 and 2.2.2 for the rest operation.

Note: If user wants to exit, reverts back to the previous menu by selecting

the“Left” keys.

Remote state

Waiting ………

1. T/R State

2. M/D State



73

2.3 - Setup Menu

Setup Menu is used to setup local EOW, TX power of local Transceiver Unit, capacity of

local Modem Unit. Put the cursor on "B. Setup " by moving the “Up/Down” keys,

then press the “Enter” key to call up "B. Setup ". Fig 37 is displayed on the

screen.

Fig 37

Setup Menu includes 3 sub-menu: local EOW, TX power of local Transceiver Unit,

capacity of local Modem Unit. Moving the “Up/Down” keys to get the following 3 menus.

"1. EOW Number "

"2. PWR Setup "

"3. CAP Setup "

2.3.1 EOW Number

EOW Number menu is mainly used to setup local EOW number. Put the cursor on "1.

EOW Number " by moving the “Up/Down” keys, then presses the “Enter” key to call up

"1. EOW Number " . Fig 38 is displayed on the screen.

Fig 38

The cursor is defaulted on the first “ 0” of the second line. The first line on the screen

shows the local EOW number, the second line shows adjustable range (from 00 to 15) of

EOW number. Only when the Local EOW number should be consistent with the remoteEOW number, EOW function comes true.

1. EOW Number

2. PWR Setup

EOW: 0000



74

On the “ EOW Setup ” page, the first line refers to the EOW number of the local equipment.

The second line refers to the EOW numbers that user can select by the “Right” key. The

EOW number is increased by one by selecting the “Up” key, and decreased by one by

selecting the “Down” key. Then press the “Enter” key to confirm. With the EOW number

increasing or decreasing, the EOW number in the first line changes accordingly.

For example, the current EOW number of local equipment is “ 00 ”, users want that EOW

number is “ 06 ”. put cursor on the second character “ 0” of the second line by moving the

“Right” key, users continuously press “Up” until the second “ 0” of the second line is “ 6”and

press the “Enter” key. Fig 39 is displayed on the screen.

Fig 39

By then the local EOW is successfully changed. If the current EOW number of remote

equipment also is “ 06 ”, EOW function is achieved between local equipment and remote

equipment, otherwise EOW function is invalidated.

Caution: please do not change the EOW number randomly. And dialing number in

fact is ‘#’+ EOW number.

EOW: 06

06



76

Fig 43

Fig 44

Fig 43 indicates the input password is wrong, Please contact with the technician and gets

technical support.

Fig 44 indicates the input password is correct and getting into PWR Setup menu. On this

page, the first line is current TX power of the local equipment; the second line is the

optional operation to the TX power of local Transceiver Unit as described in the following

table.

Note: 1 Sometimes, it might push “+” several times to increase local

Transceiver Unit TX power by 1 dBm. This is the normal reaction of the system.

2 The adjustable range of the local Transceiver Unit TX power is 17 ~ 26 dBm.

For example, if the users want to make TX power of the local equipment to be

maximal, should be according to the following operation step

Operation Meaning

The local Transceiver Unit TX power increased

The local Transceiver Unit TX power decreased

Error

Try Again

Tx Level [ 25 dBm ]

Opt. [ + , - ]



77

On the “ PWR Setup ” page, select one of [+ , - ] by the “right” key, and then press the

“Enter” key to increase or decrease the preset Tx power. The current Tx value is displayed

in the first line.

For example, if users want to reach maximum TX power of the local Transceiver Unit.

Please apply to following steps.

Step 1 Put the cursor on the "B. Setup " by moving the “Up/Down” keys, then

press the “Enter” key to call up "B. Setup " . Fig 45 is displayed on the screen.

Fig 45

Step 2 Put the cursor on the "2. PWR Setup " by moving the “Up/Down” keys,

then press the “Enter” key to call up “2. PWR Setup " . Fig 46 is displayed on the

screen.

Fig 46

Step 3 Put the cursor on "1" by moving the “Right” keys, then press the “Enter” key . Fig


Fig 47

Step 4 Put the cursor on "0" by moving the “Right” keys, then press the “Enter” key.Fig48 is displayed on the screen.

1. EOW Number

2. PWR Setup

>Local [ ]

Password:

0123456789



78

Fig 48

Step 5 Repeat step 4 to finish input of the password.

Step 6 After finishing password input, one of the following two figure will be displayed

on the screen.

Fig 49

Fig 50

Fig 49 shows that the user input password is incorrect, please contact with the technician

and get support.

Fig 50 shows that the user input password is correct and successfully get into Power

Setup menu.

Step 7 Put the cursor on "+" by moving the “Right” keys, press the “Enter” key until Fig


Fig 51

This page shows that the current local equipment’s TX Power reaches the maximumvalue. It will automatically revert back to the Power Setup menu as Fig 52.

Password: *

0123456789

Error

Try Again

Tx Level [ 25 dBm ]

Opt. [ + , - ]

Tx Level [ 26 dBm ]

MAX Value: DOWN



79

Fig 52

Step 8 The operation is completed.

CAUTION: The defaulted password is 0000000

only changing of the local Transceiver Unit TX Power is allowed

on the“PWR Setup”.

changing of the Transceiver Unit Power may result in link

instability. Only the technicians are authorized to do it.

Tx Level [ 26 dBm ]

Opt. [ + , - ]



81

Fig 56

Fig 57

Fig 56 indicates the input password is wrong, Please contact with the technician and get

technical support.

Fig 57 indicates the input password is correct and getting into CAP Setup menu. In the

example, the first line indicates the current capacity of the local Modem Unit is 2E1, the

second line is the optional operation to the capacity of local Modem Unit as described in

the following table

.

Optional capacity Meaning

1 The local Modem Unit capacity is 1E1




Error

Try Again

CAP [ 2 * E1 ]

Opt. [ 1 2 3 4 ]



82

As a function of the local Modem Unit capacity change, parameters on the standby page

will change as detailed in the following table.

Capacity parameters Capacity meaning

Q 4E1

D 2E1

S 1E1

On the “CAP Setup” page, select any of the [1 2 3 4] by the “Right” key to change the

preset capacity value. The capacity value on the standby page will change accordingly.

For example, if the user wants the local Modem Unit is 1E1, proceed as follows

Step 1 Put the cursor on "B. Setup " by the “Up/Down” keys and then press the

“Enter” key. Fig 58is displayed on the screen.

Fig 58

Step 2 Put the cursor on "3. CAP Setup " by the “Up/Down” keys and then press

the “Enter” key. Fig 59 is displayed on the screen.

Fig 59

Step 3 Put the cursor on "1" by the “Right” keys and then press the “Enter”key. Fig 60 is

displayed on the screen.

1. EOW Number

2. PWR Setup

>Local [ ]

Password :

0123456789



83

Fig 60

Step 4 Put the cursor on "8" by the “Right” keys and then press the “Enter”key. Fig 61 is

displayed on the screen.

Fig 61

Step 5 Repeat step 4 to finish the input of password: 8320830.

Step 6 after inputting the password, one of the following two figure is displayed.

Fig 62

Fig 63

Fig 62 shows that the user input password is incorrect, please contact with the technician

and get support.

Fig 63 shows that the user input password is correct and successfully get into CAP Setup

menu.

Password : *

0123456789

Error

Try Again

CAP [ 2 * E1 ]

Opt. [ 1 2 3 4 ]



84

Step 7 Put the cursor on "1" by the “Right /Left” keys and then press the “Enter”key. Fig


Fig 64

This page shows CAP Setup of the local Modem Unit has been completed.

Step 8 Reverting back to the standby page. The local Unit standby page changes to as Fig

65.

Fig 65

Step 9 The operation is completed.

CAUTION

The defaulted password is 8320830

only changing of the local Modem Unit capacity is allowed on the“ CAP

Setup ”.

changing of the capacity of Modem Unit may result in link instability. Only

the technicians are authorized to do it.

CAP [ 1 * E1 ]Opt. [ 1 2 3 4 ]

WTX-2.4-02SV4.3



85

3 - Menu structure

1.1Tx Level

1.2 Rx Level

1 .T/R Sta te

>local [ ]

2.M/D State 2.1 MOD State

2.2 DEM State

A . St a t e

1 .1Tx Level

1 .T/R Sta te 1.2 Rx Level

>Remote [ ]

2.M/D State 2.1 MOD State

2.2 DEM State

WTX2.4- 02D

V4.3

1.EOW Number

B. Setup 2.PWR Setup local [ ]

3.CAP Setup local [ ]



86

E. Maintenance



87

On detecting a failure, the operator must go to one of the stations on the failed hop,

analyze the fault and determine which element has failed.

1 - Preventive Maintenance

It involves inspecting the units and their interconnections (connectors, cables, sockets,

etc), as well as all the equipment involved in the operation of the station (power generation

equipment, compressor if appropriate, solar panels if appropriate, earthing, etc) and, in

case of doubt, checking the suspect parts, taking all the necessary precautions to avoid

disrupting data transmission through the link.

1.1 - Routine Maintenance

Since the performance of component parts such as, IC’s transistors, resistors tend to

change under influence of heat and time, it is recommended that routine maintenance is

carried out at a regular interval to find out any changes of condition, which may cause

unexpected system break Down some time later.

1.2 - Routine Checking Of Operation Conditions

1.2.1 -Equipment should be kept from dust.

1.2.2 -Check the condition of the cables connectors and connections.

1.3 -Test on the measurement pointThe Transceiver Unit output power, Received signal level; Tx/Rx local oscillator frequency

is measurable at the measurement points of the Transceiver Unit.

1.4 -The supervision

Performance status of both local and remote equipment can be displayed on the LCD

screen which built in MODEM unit. The operator analyzes the alarm and initiates

appropriate corrective maintenance operations



88

1.5 - Keeping maintenance log

Maintenance log should be kept for each station. All maintenance operation check results,

date of the occurrences of failures, remedial action taken, and other necessary things

should be logged for reference.

2 - Corrective maintenance

- Check the condition of the cables, connectors and connections, and of all the

components that are involved in the operation at the station (power supply, battery,

earthing, etc),

- Analyze the IDU alarm indicators,

- If alarms are indicated, locate them using LCD of the MODEM Unit and analyze them

and carry out the necessary corrective procedures (change of unit, module, cable, etc).

3 - Analyzing Modem Unit alarm indicators

The alarm indicators on the Modem Units provide an indication of network elements

affected:

The ALM LED lighting: the local equipment alarm

The RMT LED lighting: the remote equipment alarm



89

3.1 - Using the LCD on Modem Unit to trace alarms

If the following figures appear on the LCD of the Modem Unit

Fig 1

Fig 2

TRL: TX power alarm

TX power low or fading

① Check whether the IF connection is normal or not

② If IF connection is normal, disconnect the IF connector, connect Transceiver Unit

to the other Modem Unit, check whether TPW is normal or not.

③ If not, change Transceiver Unit.

RX: RX level alarm

RX level low

① Check the antenna, if the antenna is not accurately pointed, repoint and check

that the alarm disappears. Abnormal conditions are hampering propagation:

presence of a sheet of water or waterlogged ground along the path of the link,

reflections from one or more layers of the troposphere caused by abnormal

stratification of the atmosphere, a fairly frequent condition in tropical climates,

natural screen or construction strongly masking the first “Fresnel ellipsoid”, rain

storms, etc.

② Check RF cable③ Check RF connection

Tx: [ALM]

Rx: [NOR]

Tx: [NOR]

Rx: [ALM]



90

④ If not, change Transceiver Unit.

If the following message appears on the LCD of Modem Unit.

Fig 3

① RUM connection problem: disconnected, incorrectly fastened, cut,

short-circuited or bad contact inside a connector. Repair the connection, check

its connectors, and change the defective items or the connection.② Do not power Transceiver Unit: check whether the power supply LCD of

Transceiver Unit is normal or not.

③ Change Modem Unit

④ After use the new Modem Unit, the alarm persists, change Transceiver Unit.

If Fig 4 appears on the LCD.

Fig 4

① connection problem.

② Change Modem Unit

Caution!

T/R COMM Fault

TX: + dBm

RX: - dBm



91

3.2 - Using the LCD on MODEM Unit to trace alarms

Modem Unit1 Block diagram

On installation, any channel interference will cause some alarms to be generated, so,

make sure the channel hasn’t been interfered.

NºAlarm

messageMost probable case and corrective methods

1 TIFTX IF alarm: Modulation IF lossCheck the power supply of Modem Unit, otherwise, change theModem Unit

2 TSLTransmitter signal loss: the output of coding signal lossCheck the power supply of Modem Unit, otherwise, change ModemUnit

3 IN1 The first E1 loss alarm: the first 2Mb/s data input lossCheck the 2Mb/s data input against the installation sheet;

Signal rate Adjust andFEC

ModulatorI

Q

Q

I

70MHz

70MHz

To Transmitter 1

From Receiver 1

21

ALC

5DEM678910

2Mb/s

2Mb/s



92

Check the 2Mb/s data input short circuit or open of the line;Check cable loss;Check the E1 I/O connection;Otherwise, change Modem Unit.

4 IN2 The second E1 loss alarm: the first 2Mbits input lossCheck methods is as same as IN1

5 RIF

Receiver signal loss alarmDisconnect IF connector on IF_OUT of Modem Unit and IF_IN ofModem Unit, connect IF_IN to IF_OUT of Modem Unit by IFconnection;Check whether RIF on the MODEM Unit LCD is normal; if RIF isnormal, check the IF_connector on the RX of Modem Unit; changeTransceiver Unit;Otherwise, change Modem Unit.

6 ERR

Error alarm, error bit has been in communication.Disconnect IF connector on IF_OUT of Modem Unit and IF_IN ofModem Unit, connect IF_IN to IF_OUT of Modem Unit by IFconnection; Check whether ERR is normal; If ERR is normal, theinterference in communication exist: otherwise, change Modem Unit.

7 FLS

Frame synchronization loss alarmDemodulator frame unlock. Electrical power must be switched offthen on.Otherwise, change Modem Unit

8 RMTRemote terminal alarmOn the remote menu of the MODEM Unit, check alarm information ofthe remote equipment.If necessary, the operator must go to the remote station.

Change Modem Unit:

① Disconnect all the connection connected to the equipment you are changing;

② Change Modem Unit after checking that the characteristics match; reconnect

all the connection to the Modem Unit;

③ Power the Modem Unit;

④ Wait for about four second for the terminal to be reconfigured, the alarm

LEDs should go off and the equipment LEDs should turn green;

⑤ Update the station’s installation form.(refer to installation manual).



94

4 - System Troubleshooting and maintenance

4.1- Tx Troubleshooting and maintenance:

4.1.1 When Tx is in trouble, there is Tx power alarm on the LCD of Modem Unit. It is

can be shown as follows:

According to the above, the trouble spot should be found.

TX XXdBm ALM

RX XXdBm NOR



95

Normal?

IF connection

is normal

Check whether IF connection

line is normal

Self-loop check of

Modem Unit

Modem Unit shows

TX 25dBm NOR

(Transceiver Unit is

normal)

Modem Unit shows

TX XXdBm ALM

(Transceiver Unit is in

trouble)

Repair power andconnection

Equipment gets right

Replace or link IF

connection


N

N

N

Y

Y

Y

Check Modem Unit

Modem Unit displays

TX 19dBm ALM

Check power supplyof equipment

N

Y

1 2



97

Connect power meter at the RF port

of unit or inspect Rx level on the

remote end from the local end

No output power

Check RF connection

Replace RF

connection in trouble


N

Y

Normal ?

Operate EP switch on the

switching unit

Switching Unit RF on-off box introuble

Replace Switching Unit or RF on-off

box in trouble see 7 about

maintenance of switch unit


Replace Transceiver

Unit or Tx filter with

the same frequency

one (see 6 about

maintenance of

Transceiver Unit)

Y

Normal ? N



98

4.2 - RX troubleshooting and maintenance

Rx trouble includes lower alarm of Rx level and alarm of no Rx level. The First step is to

check the antenna direction, installation of antenna and cable, Tx unit on the remote end.

If the check shows that all above is normal, then Rx troubleshooting and maintenance

should be done on the local equipments.

4.2.1 - Alarm of Rx level or no Rx level

Modem Unit show:

RX XXdBm ALM

XX 86dBm or LOW

Check RF connection and connector

normal

Check RF N-type cable

Normal

If RF on-off and subbranch box of

switching unit are in trouble, replace

switching unit or them see 7 about

maintenance of switch unit


Turn to check

Transceiver Unit(see 5 about

maintenance of

Transceiver Unit)

Replace RF cable


If N-type connector is loose

Screw down N-type connector


N

N

Y

Y

Normal?N

Y



99

4.2.2 - No Rx level on the Transceiver Unit:

Modem Unit show:

RX XXdBm ALM

XX 86dBm or LOW

Check RF connection and connector

RLO ALM

normal

unit alarm state of the local Transceiver Unit

will be shown as following:

1.4.1 RLO ALM or NOR

1.4.2 RSL ALM


Replace RF connection


N

Y

LNA of Rx unit on the Transceiver

Unit is in trouble replace Rx unit or

Transceiver Unit

with the same frequency ones

Y N

If LO of Rx unit on the Transceiver

Unit gives an alarm replace Rx unit or

Transceiver Unit with the same

frequency ones



101

4.3 - E1 I/O interface troubleshooting and maintenance:

If trouble occurs connecting between equipment and others through E1 interface, please

analyze and maintain as the following method.

Trouble in E1 I/O connection

Re lace E1 I/O connection


no signal at each E1interface ?

N

Normal ?

Y

Connect again


N

Checking whether some

channel is broken

broken?N

No signal at E1 interface

Checking whether four E1

channels connection are normal

Check E1 I/O connection

Y

Seal again


Y



102

4.4 - Troubleshooting and maintenance of monitor and display keyboard

4.4.1 - Troubleshooting and maintenance should be done as follows when Modem Unit

does not display parameter of the corresponding Transceiver Unit:

a When Modem Unit displays “Caution T/R com Fault”

Please check whether RUM connection is connected correctly and work

normally. If broken or have some trouble, RUM connection needs to be sealed

again or replaced. As Soon as equipment gets right, it will display :

b. when Modem Unit does not display alarm state of the corresponding Transceiver

Unit, it will show:

This fault means turn-off of Tx or Rx alarm indicator. please operate as follows:

Operate MODEM Unit and choose corresponding state display of Tx or Rx.

Choosing alarm state “ON”, it will show as follows:

1.3.1 TLO [ON]

1.3.2 TPW [ON]

1.4.1 RLO [ON]

1.4.2 RSL [ON]

Quitting operation, it will show:1.3.1 TLO [NOR]

1.3.2 TPW [NOR]

1.4.1 RLO [NOR]

1.4.2 RSL [NOR]

TX 25dBm

RX XXdBm

TX 25dBm [NOR]

RX XXdBm [NOR]



103

Exiting from operation of state display, Modem Unit will display as follows:

c. If the Modem Unit does not show the parameter of Transceiver Unit, it will show:

To check the corresponding OAM connection and insure that it is normal. If

the connection is broken, please weld it or replace a new one. The equipment

gets right.

4.4.3 - Display trouble:

a. If there is no display trouble on the LCD of Modem Unit Unit, check the power

supply and insure that power switch is normal. Turning on the power switch, its

display gets right.

b. Open Modem Unit to check if the LCD connection is plugged correctly. Line

connecting, the display gets right.

4.4.4 - Trouble of keyboard operation:

a. If there is no reaction operating keyboard, please restart the Unit and reset the

keyboard control to make it gets right.

b. If one key on the keyboard is insensitive or unresponsive, it is key trouble. Please

replace the Unit. If problem can not be solved as indicated above, please replace the

TX 25dBm NOR

RX XXdBm NOR

TX dBm

RX dBm



106

5.2 - Troubleshooting and maintenance of display and inspection

5.2.1 - troubleshooting and maintenance of Tx and Rx display:

Trouble phenomenon: the front panel LCD of IF demodulation displays

+26dBm can’t be changed,

-34 dBm can’t be changed.RX -××dBm

TX +××dBm

Reading on the LCD does not

change

Check whether U10 MX584 pin 2

on the power board of 2.4GHzTransceiver Unit is +5V

Check whether U11 MAX840 pin

6 on the power board of2.4GHz Transceiver Unit is -5V

Check whether U9 MX5160 pin 5

or 6 on the power board of

2.4GHz Transceiver Unit is 2.4V

Replace U3 MAX114 on the

power board of 2.4GHzTransceiver Unit

replace

chip

Equipment

gets right



107

5.2.2 - Troubleshooting and maintenance of Tx and Rx measurement point

Trouble phenomenon: the voltage of DB9 pin 2 on the front panel of Transceiver Unit is

zero; the voltage of DB9 pin 4 on the front panel of Transceiver Unit is zero. Above both

are measured with multimeter.

a. check the RF connection 5 if it isn’t inserted correctly.

b. If reading on the front panel LCD of Modem Unit shows that Tx is normal, test

whether it is lined correctly between S5 pin 5 and DB9 pin 2 on the front panel of

Transceiver Unit or short circuit occurs, then repair it. The trouble of Tx power

inspection can be removed.

c. If reading on the front panel LCD of Modem Unit shows that Rx is normal, test

whether it is lined correctly between U7(LM1458)pin 1 on the 2.4GHz Transceiver

Unit power board and DB9 pin 4 on the front panel of Transceiver Unit or short circuit

occurs, then repair it. The trouble of Rx power inspection can be removed.



108

5.2.3 - Troubleshooting and maintenance of Rx and Tx local oscillation inspection:

Trouble phenomenon: to connect the microwave frequency meter (with N-SMA

conversion connector) with RLO and TLO on the front panel of Transceiver Unit, no

frequency is shown.

Testing the LO inspection port of Rx and Tx unit, if the frequency can be found, then

check SMA-JB3/ SMA-JB3 connection lines. If there is no frequency, analyse should

be done according to the flow chart.

Adjust or replace connection

Abnormality phenomenon of LO power inspection can

be divided into

a. reduction b. nonexistence

Check whether SMA-KF3-80 connection line is broken

or links to GND

Check coupling board of LO power inspection

Check LO

LO power inspection is normal

Repair LO if in trouble

Normal?

Adjust or replace

cou lin board Normal?



109

5.3 - Tx troubleshooting and maintenance

5.3.1 - No power output troubleshooting and maintenance

Trouble phenomenon: to connect the microwave power meter (with N-SMA conversion

connector) with Tx port on the rear panel of Transceiver Unit, there is no power output or

below the nominal.

No power output or below the nominal

Check whether IF signal exists on the connection

test whether power signal exists on the Tx unit

Turn to section 5.1

to handle LO

Check 70MHz IF signalCheck whether two

class amplification of

power IF amplifier is

normal and insure that

70MHz output signal

is normal

Up-convertor is normal ?test mixer and check

whether class1

amplification is normal

Check single-band filter

Turn to single

filter repairment

Power amplifier isnormal

Repair power supplyand insure it works

normally

Power amplifier doesn’t work

Replace PA module and test it again to make it works normally

Normal power output of Tx unit

It’snormal ?

Above is

normal

LO power inspection isnormal



110

5.3.2 - troubleshooting and maintenance if Tx unit power can not be tuned

5.4 - Troubleshooting and maintenance of no Rx gain

5.4.1 - troubleshooting and maintenance of no Rx gain

Tx unit power can not be tuned

Check whether P-MON detector

voltage is normal at the power IF

amplifier spot measured with

multimeter

Check detectordiode and feed

through capacitoron the power

amplifier moduleand insure thatthey are normal

Check whether PIN is normal on

the power IF amplifier module

Replace changeableattenuator

Check changeable resistance

Replace it if in trouble

Tuning of Tx unit power is normal

LNA doesn’t

work?

LO is in lock loss? Isolator doesn’t

work?Rx mixer doesn’t

work?

Repair it Replace it Repair it, Adjust

every parameter

again according to

adjustment method

Repair it, Adjust

every parameter

again according to

adjustment method

Normal Rx gain



111

5.4.2 - troubleshooting and maintenance of Rx IF amplifier

a. Output level is not normal and tune RP3 in no effect.

To test MAX840 pin 6 with multimeter, If the voltage isn’t -5V ,then MAX840 does

not work and replace it or V5/V6 detector diode may be soldered not correctly or

broken.

b. AGC range not enough

A 10UF capacitor should be soldered between the +12V spot of the signal input

and GND. To test the N1~N6 integration amplifier with the multimeter ,the voltage

of output pin is in the range of 4.9V to 5.2V. If the voltage is not in the range , the

capacitors from C4 to C14 should be checked to see whether they are soldered

and work correctly and the V1 through V4 diodes are normal.

c. AGC shows voltage not normal

To test the diode D1, it should be replaced If the diode D1 does not work.

Otherwise the feedback resistance should be tested between pin 6 and pin 7 of

LM1458 in order to see whether it is 24K.

5.4.3 - LNA troubleshooting and maintenance

When the gain is very small and can not be tuned up, first check whether the line on the

transition board has been cut off, second check whether the isolator may be installed not

correctly or does not work, third check R1 voltage. If R1 voltage is 5V , then N2 is broken

and N1 broken if not.



112

5.5 - Troubleshooting and maintenance of LO in trouble

Trouble phenomenon: LO phase loss,locked level is 0V

Y NCheck soldering of 8MHz crystaloscillator and whether it works

Check pin setting of

MC145152 and whether

it is soldered correctly?

Check soldering of

MB510 and whether it

workes correctly?

Finally set LO with required

frequency

Change resistance

value of R10

Repair it and itworks correctly?

Finally check loop filter and whether

its output level of LM1458 is in

the range of 6V—8V?

Repair it and

it works

correctly?

Repair it

and it

works

LO output is normal

Y

Y N

Y N N

N

Y

N Y

Y

N



113

6 - Troubleshooting and maintenance of Modem Unit

6.1 - ALM analysis

When ALM of Modem Unit shines, connector links of external cable and cable are

checked to see if they are normal. Alarm information shown by system should be

analyzed in detail if they are normal.

6.1.1 - Tx alarm state:

6.1.2 - Rx alarm state:

2.2.1 RIF[NOR] /[ALM] IF Rx alarm2.2.2 ERR[NOR]/ [ALM] Rx error-code alarm2.2.3 SYN[NOR]/ [ALM] RPD Synchronization loss alarm2.2.4 HSW[NOR]/ [ALM] hitless switching alarm

2.2.5 FLS[NOR]/ [ALM] frame synchronization loss alarm2.2.6 RMT[NOR]/ [ALM] remote equipment alarm

Operate unit into state display

LOCAL[ ]

M/R STATE

MOD STATE

2.1.1 TIF[NOR]/ [ALM] IF Tx alarm2.1.2 TSL[NOR]/ [ALM] IF signal alarm2.1.3 IN1[NOR]/ [ALM] no input alarm of subbranch 12.1.4 IN2[NOR]/ [ALM] no input alarm of subbranch 22.1.5 IN3[NOR]/ [ALM] no input alarm of subbranch 32.1.6 IN4[NOR]/ [ALM] no input alarm of subbranch 4

DEM STATE



115

6.2 - Troubleshooting and maintenance of IF Tx alarm (TIF [ALM])

trouble phenomenon no IF Tx output alarm on the Modem Unit

N Replace it if 70Mcrystal oscillator 3JZ1 is

in trouble

Y

Check whether output of 90 power

splitters/combiners is normal

Y

N

N

Y

N

Y

Check whether output of

amplifier 3N3 is normal

N


amplifier 3N2 is normal

Y

N

Y

Check whether output of diode

3V1 and 3V2 is normal

N

Replace comparator 3N1

Y

Alarm disappears? Y

N

Alarm disappears and Modem

Unit is normal

N

N

N

N

N

N

Y

Y

Y

Y

Y

Y

Check whether input signal exists atthe pin 1 of amplifier 3N4

Check whether output of mixer 3N9and 3N8 are normal

Check whether output of 0 ˚ power

splitters/combiners 3N7 is normal

Replace it if 90 ˚ power

splitters/combiners is in

trouble

Replace it if mixer is

in trouble

Replace it if 0 ˚ power

splitters/combiners is in

trouble

Replace it if amplifier

is in trouble

Replace it if amplifier is

in trouble

Replace it if diode isin trouble

Alarm disappears?

Alarm disappears?

Alarm disappears?

Alarm disappears?

Alarm disappears?

Alarm disappears?



117

6.5 - Troubleshooting and maintenance of Rx de-modulation alarm (SYN

[ALM] / FLS [ALM])

trouble phenomenon Self-loop lock loss on the Modem Unit

6.5.1 - Using IF connection to link IFIN and IFOUT of Modem Unit in the way of

self-loop.

6.5.2 - Measure base voltage of transistor (V5-8). replace them in trouble.

6.5.3 - Troubleshooting and maintenance



118

Note: The following analysis demands that Tx must be in no trouble.

N


70MVCO5JT1 pin 8 is normal

Replace 5U1

Alarm disappears and Modem Unitis normal

YAlarm disappears?


amplifier 5N5 pin 4 is normal

Replace it if amplifier

is in trouble

Replace it if VCO is

in trouble

Check whether output of 90 ˚

power splitters /combiners5N4 pin 3 and pin 6 are

normal

Replace it if 90 ˚

power splitters is in

trouble

Check whether output of mixer

5N2 pin 2 and 5N3 pin 2 are

normal

Replace it if mixer is

in trouble

Check whether pin 7 and pin 8

of comparator5U3 and 5U4

work correctly?

Replace it if

comparator is in

trouble

Check whether pin 4 and pin 9

of comparator 5U6 and 5U7

work correctly?

Replace it if

comparator is in

trouble

YAlarm disappears?

YAlarm disappears?

YAlarm disappears?

YAlarm disappears?

YAlarm disappears?

N

N

N

N

N

N

Y

Y

Y

Y

Y

Y



119

6.6 - Troubleshooting and maintenance of EOW

Check whether

output at the pin 5

of 8N9 is normal

EOW in trouble

Can not dial out Can not dial in

Replace 8N12

NCheck whether

output at the pin 5

of 8N10 is normal

N

Y

Replace 8N11

Y

Replace it if audio

amplifier 8N10

is in trouble

Alarm disappears

N

Modem Unit is normal

normal

N

YY

Y

Check if there is 64k signal input

at the pin 1 and pin 9 of 8N17.

Please confirm

that ModemUnit is

in no trouble again

N

Check if output at the pin 3 and

pin 8 of NAND gate 8N17 is

normal.

N

Check if output of PCM 8N15

is normal

N

Y

Y

Normal

Replace it if 8N17

is in troublenormal

N

Replace it if it’s in

trouble normal

N

Y

Y

Y

Replace it if audio

amplifier 8N9 is

in trouble



120

6.7 - Troubleshooting and maintenance of display and monitoring

6.7.1 - Troubleshooting and maintenance in this case like no display on LCD

Replace LCD

9U3 is in trouble9U1 is in trouble

Replace 9U1 Replace 9U3

LCD display is normal

YLCD is in trouble?

Pin 6 of LCD 9JP1is 0V?

N

NY



121

F. Service



122

1 - TECHNICAL SUPPORT

Manufacturer Support and General Inquires

Manufacturer provides service and support in the following ways:

E-mail

Telephone

Hours of operation are from Monday to Friday 9:00AM - 5:30 PM.

To ensure the equipment normal operation, manufacturer provides route selection

and design.

Manufacturer provides necessary training on installation and operation.

Manufacture may provide installation and technical supervision on actual

requirement.

We promise we receive FAX, telephone about quality problem, after analyzing

problem; our technician will get to the site as soon as for domestic customers.

Return the defective equipment back to manufacture for prepare for overseas

customers.



123

2 - WARRANTY

2.1 - General terms

2.1.1 - All definitions contained in Manufacturer apply to the warranty.

2.1.2 - Manufacturer warrants that for a period of 1 year from the date of purchase from

Manufacturer or an authorized reseller, the product will be free from defects in material

and workmanship under normal use. If this product is not in good working order as

warranted, the sole and exclusive remedy shall be, at Manufacturer's option and

expense, to repair the defective product or to provide an equivalent replacement product.

All products that are replaced will become the property of Manufacturer. Replacement

products may be new or products reconditioned to a like-new condition.

2.1.3 - this warranty dose not applies to Antenna and feeder system and rack, which

non-manufacturer provided.

2.2 - Restrictions

This warranty does not apply if the product has been altered, except by Manufacturer

has not been installed, operated, repaired, or maintained in accordance with

instructions supplied by Manufacturer

has been subjected to abnormal physical or electrical stress, misuse, negligence, or

accident, or used in ultra hazardous activities.



124

Appendix 1 - List of application alarms

Alarmmnemonic

MEANING

TLO Tx local oscillator alarm

TPW Tx power alarm

RLO Rx local oscillator alarm

RSL Rx signal alarm

TIF Tx IF alarm

TSL Transmitting signal loss

IN1 The first E1 loss alarm

IN2 The second E1 loss alarm

IN3 The third E1 loss alarm

IN4 The four E1 loss alarm

RIF Rx IF alarm

ERR Error alarm

FLS Frame synchronization loss alarm

RMT Remote terminal alarm



Appendix 2 - RX/TX level and Voltage corresponding graph

newwtx2[1].4 02 digital microwave system

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