Signalwing J2I Series Manuale utente

J2I Series Products

r’

’s

08/2019

J2I Series User Manual

Preface

This User Manual provides installation, configuration, operation and maintenance guidance of the

repeater. Specifications are also provided at the end of this User Manual in order to help users better

understand the repeater. Please read this user’s manual thoroughly and follow the instructions outlined

in this manual to ensure a long life span and a trouble-free repeater unit.

Warranty

Lightning protection must be done for all outdoor antennas. Damage to power modules, as a result of

lightning is not covered by the warranty.

Switching on the AC or DC power prior to connection of antenna cables is considered as an incorrect

installation process and therefore faults arising thereafter are also not covered under the warranty.

This entire manual should be read and understood before operating or maintaining the repeater system.

We assume no liability for customer's failure to comply with the precautions mentioned. This warranty

will not cover such failures to comply.

Safety Information

Do not operate equipment in an explosive environment. Appropriate AC or DC power needs to be supplied

to the repeater. To avoid power supply spark, please perform the grounding connection of the equipment.

In order to avoid equipment damage or human injury by lightning, static electricity and other phenomenon

of leakage electricity, Our company suggest all products must do the electric-discharge of the electrical

grounding in setup process. Incorrect power settings can damage the repeater and may cause electrical

related injury to the user.

Acknowledgment

Thank you for purchasing the Our company repeater. Strict quality control system procedures are

implemented to ensure you a high-quality product; with numerous cellular operators acknowledging the

product to be a high performance, low interference, transparent and simple to operate and maintain.

This document is written for Our company and customer service personnel, who install, configure and

commission the repeater system in a cellular network.

 J2I Series User Manual 
 

 
 
Contents 
PREFACE.......................................................................................................................1 
WARRANTY ...................................................................................................................1 
SAFETY INFORMATION................................................................................................1 
ACKNOWLEDGMENT ...................................................................................................1 
CONTENTS ....................................................................................................................2 
INTRODUCTION ..............................................................................................4 
1 J2I/F Series Band Selective Repeaters ..................................................................................4 
2 General Installation Layout................................................................................................4 
3 Advantages............................................................................................................................5 
INSTALLATION................................................................................................6 
1 Isolation..................................................................................................错误!未定义书签。 
1.1 Self-Oscillation Resistance.......................................................................................................................6 
1.2 The Isolation Value...................................................................................................................................6 
2 Precautions and Preparation..................................................................................................7 
3 DonorAntenna Installation....................................................................................................8 
4 ServiceAntenna Installation ..................................................................................................9 
5 Repeater Installation...............................................................................................................9 
5.1 Installing the Repeater..............................................................................................................................9 
COMMISSIONING.......................................................................................... 10 
1 Downlink Output Power.......................................................................................................10 
2 Repeater Configuration........................................................................................................ 11 
2.1 Start-up the Repeater..............................................................................................................................11 
2.2 Repeater Settings.....................................................................................................................................11 
MAINTENANCE .............................................................................................15 

J2I Series User Manual

4.1 Status,Alarms possible Solutions ........................................................................................15

4.2 Troubleshooting.....................................................................................................................15

4.3 Replacement...........................................................................................................................16

5. APPENDIX.............................................................................................................17

5.1Abbreviations.........................................................................................................................17

J2I Series User Manual

1. Introduction

1.1 J2I/F Series Band Selective Repeaters

The J2I/F Series Repeater is compact in size and light in weight. Hence, the installation of the J2 Series

Repeater is easy, simply just plug and play. With the control panel in front of the repeater, the repeater

status can be known during installation.

Figure 1 LED Indicators

1.2 General Installation Layout

J2I Series User Manual

Figure 2 Profile

For indoor application, a typical installation layout of the Broad Band Repeater is shown in Figure 1. The

Yagi antenna is used as the donor antenna, and is connected to the repeater. Omni and panel antennas

are being used as the service antennas.

The donor antenna is placed outside of the building, while the repeater is placed inside the building to

extend radio coverage to the dead zones.

1.3 Advantages

◆Fast & easy Installation

The installation of a repeater is easy and simple. With its plug and play design, installation simplicity, and

operational user friendliness, these features appeal greatly to many operators for the purpose of indoor

coverage or for temporary coverage during network optimization.

◆Smart Function

Compare to the worldwide repeater brand, the J2 series has a smart function called which can be activated

via the front panel. This smart function can prevent UL interference and self-oscillation caused by

insufficient isolation between donor and service antennas, and also setup parameters and keep optimal

condition automatically; the only thing for users is just activating this function by front panel.

Notify that the users can’t adjust by manual setting when smart function is initiated.

◆Auto Level Control

The 25dB ALC is used to maintain steady output power even when the donor source signal fluctuates.

Also, when the ALC is activated, the ISOLATION LED indicator would be lighted in orange, which means

the Isolation may not be enough. It also prevents UL interference and self-oscillation from insufficient

isolation between donor and service antennas.

◆Antenna Isolation Testing

J2I series product also has a repeater mounted antenna isolation detection function. Equipment

installation completed boot automatically after the onset detection transceiver antenna isolation, if

transceiver antenna isolation can not meet the installation requirements, the device will automatically

reduce the gain to guarantee the equipment in normal working, not self-excitation vibration, guarantee not

to interfere base station and repeater itself. At the same time alarm exhibit of orange bright red-light alarm.

Device LED gain display panel will display device is reduced after the equipment current gain state, which

has the advantages of convenient construction, but also to protect the base station equipment, and does

not generate interference.

J2I Series User Manual

2. Installation

2.1 Isolation

Isolation is an important concept for the repeater system, and it is one of the factors that affect the location

of the donor antenna and the location of the service antenna. In the repeater system, the isolation must be

enough, which means the donor antenna cannot be installed too close to the repeater. But what is isolation?

The isolation is the propagation loss between the donor antenna and the service antenna which needs to

be at least 15dB higher than the gain value of the repeater. Non-compliance to this criterion would result in

poor signal quality or poor signal strength in the coverage area and the amplifier of the repeater may also

be damaged.

Isolation ≧Repeater Gain + 15 dB

2.1.1 Self-Oscillation Resistance

Self-oscillation is a phenomenon that would occur when the isolation for the repeater system is not enough. In other words,

insufficient isolation between donor and service antennas would result in self-oscillation. Which means part of the signal

that isbeing amplified by the repeater radiates back towards the donor antenna and got picked up by the donor antenna and

went through the repeater amplification process again. Severe oscillation issue would result in poor signal quality and at

times it can even damage the repeater amplifiers. Self-oscillation will deteriorate the signals inside the coverage area and

interfere towards the BTS.

2.1.2 The Isolation Value

The precise estimation of the isolation value can be obtained via a physical test measurement. This test

measurement is done at the actual environment where the donor antenna and the service antenna are

installed for a repeater system. The test measurement procedures are

1. Connect the signal generator (SG) to the donor antenna and transmit a signal with a

frequency (For GSM900, uplink is 890~915MHz and downlink is 935~960MHz.

Choose frequency 920MHz to do the test. For DCS1800, uplink is 1710~1785MHz

and downlink is 1805~1880MHz. Choose frequency 1795MHz to do the test. For

WCDMA2100, system uplink is 1920~1980MHz and downlink is 2110~2170MHz.

Choose frequency 1995MHz to do the test. In simple words, choose the idle

frequency of the system to do the test) of certain power level from the SG.

2. Connect the spectrum analyzer (SA) to the service antenna and scan for the known

frequency (The frequency used by the signal generator). Mark the received power

J2I Series User Manual

level on the SA.

3. Subtract the power level received at the spectrum analyzer from the output power

(OP) level of the signal generator to obtain the isolation value.

Isolation (dB) = OP from the SG –Received Power on the SA

Transmit a strong OP from the SG is recommended (excess of 20dBm) for easy

recognition and detection by the SA.

2.2 Precautions and Preparation

1. Ensure the power applied to the repeater is within its working range. A separate

circuit breaker is recommended.

2. Ensure the donor antenna is installed at the location where signal from the donor

BTS (Node B) is good enough.

3. Ensure there’s sufficient isolation between the donor and service antenna.

4. The repeater is designed for indoor application. Ensure the location of the repeater

is dry and ventilative.

5. Ensure there are adequate resources to handle the weight of the repeater.

6. Some electronic parts contain carcinogenic constituents, please handle the

repeater with care, and discard the in a safe place if necessary.

Tools Required for Installation

The suggested tools required for a successful installation are:

J2I Series User Manual

1. Signal Generator......................................................x1

2. Site Master...............................................................x1

3. Engineering Mobile..................................................x1

4. Multi-meter...............................................................x1

5. Electrical Drill...........................................................x1

6. Hammer...................................................................x1

7. Spanner...................................................................x1

8. Screwdriver..............................................................x1

9. Waterproof Sealant..................................................x1

2.3 Donor Antenna Installation

The location of the donor antenna strongly influences the performance/characteristics of the RxLev (RSCP

for 3G) and RxQuality (Ec/No) of the intended coverage area.

The donor antenna is usually installed outside of the building, pointing towards the donor BTS (NodeB) for

best reception of the receiving signal. When choosing the location for the donor antenna, there are 3

criteria need to be met:

For 2G Systems

1. The Rxlev of the signal, at the input to the BTS port of the repeater is suggested to be

in the range of -55dBm to -70dBm

2. The RxQuality index ranging from 0 to 2 is required.

3. The Rxlev of primary BCCH is at least 6dB higher than the BCCH of neighboring BTS

sites.

Note: For 3G Systems

1. The RSCP of the donor signal is suggested to be in the range of -60dBm to -70dBm.

2. (Ec/No)AS_CPICH

≧

-7dB; AS_CPICH is the Pilot Channel in Active Set (Serving Cell)

3. (Ec/No)AS_CPICH –(Ec/No)MS_CPICH

≧

6dB

The donor antenna should be installed at least 3 meters above the ground but not higher than 7th floor of

any building. If the donor antenna is located at a high floor, it would be difficult to obtain a dominant BTS

signal from nearby BTS.

J2I Series User Manual

A lightning rod is necessary when the donor antenna is located at a relative high position. On the other

hand, an arrestor could be connected between repeater and donor antenna for better protection.

Waterproofing of the antenna installation is also important, and it can be done with the following process:

1. Use the donor antenna cable to form a half loop at the point of entry into the house so

that rain water would drop off instead of flowing inside along the cable, and also also

form a half loop before the antenna cable connects to the repeater as the waterproof

measure.

2. Secure the cable entry point. Seal the donor antenna’s connector and repeater’s

connector with a waterproof sealant.

2.4 Service Antenna Installation

Find the right spot to install the service antenna so the required coverage can be fully covered by the

repeater is one of the most important concepts that needs to be considered. However, the following three

points should be considered while installing the service antenna.

1. Do not install the repeater near metal or obstacles that may influence its coverage

performance.

2. It is suggested to install the repeater at least 2m above the floor for the best coverage.

3. The service antenna should not be installed to close to the donor antenna to avoid

issues with isolation.

2.5 Repeater Installation

2.5.1 Installing the Repeater

◼Use the hanger that comes with the repeater package, and place the hanger on the

wall where repeater is going to be installed, use the hole on the hanger to secure the

hanger on to the wall.

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