Shyam Telecom DB5R33-8501900 Dual Band Repeater Cellular-850 + PCS-1900 User Manual User s manual for

Shyam Telecom Inc. Dual Band Repeater Cellular-850 + PCS-1900 User s manual for

UserManual.wiki >

Shyam Telecom >

DB5R33-8501900 User Manual >

Users Manual HTML Version

Users Manual

Next Generation

Signal Enhancement

RF / DBR Series

. Page

DDBB55R

(

(Dual Band)

850 Cellular & 1900 PCS For Outdoor Applications

October 2007

Proprietary Information

The information contained herein is proprietary to Shyam Telecom Limited.

Unauthorized access, copy and replication are prohibited. This document must

not be copied in whole or part by any means or it shall not be disclosed o

divulged to any third Party without the prior written consent of Shyam Telecom

Limited.

Next Generation

Signal Enhancement

Contents

1. Document History.........................................................................................4

2. Disclaimer......................................................................................................5

3. Safety Instructions and Warnings...............................................................5

3.1. Personnel Safety....................................................................................5

3.2. Equipment Safety...................................................................................5

3.3. Electrostatic Sensitivity ..........................................................................6

4. Introduction...................................................................................................7

4.1. Purpose .................................................................................................7

4.2. Scope.....................................................................................................7

4.3. Definitions ..............................................................................................7

4.4. References ............................................................................................8

4.5. General ..................................................................................................8

5. Functional Description Of DB5R Dual Band Repeater...............................9

5.1. General Description ...............................................................................9

6. To Get started-Basic Software Control Of the Repeater..........................13

6.1. General ................................................................................................13

6.2. Terminal Set-up ...................................................................................13

6.3. Modules In DB5R-Description..............................................................20

7. DB5R Repeater Specifications...................................................................24

7.1. Electrical Specifications-RF .................................................................24

7.2. Electrical Specification Power Requirement ........................................24

7.3. External Electrical Interface .................................................................24

7.4. Mechanical Specification .....................................................................24

7.5. Environmental Specification.................................................................25

7.6 Contents of Delivery............................................................................25

8. Installation...................................................................................................26

8.1. Preparation Sheet- Pre Installation ......................................................26

8.2. Engineering Consideration...................................................................27

8.3. Installation Tools..................................................................................29

8.4. Installation Procedure ..........................................................................29

8.5. Repeater Gain Settings........................................................................30

8.6. Commissioning ....................................................................................31

8.7. Dos & Don’t Dos ..................................................................................31

8.7.Checklist – Post Installation ..................................................................33

9. System Maintenance...................................................................................34

. Page

Next Generation

Signal Enhancement

9.1. General ................................................................................................34

9.2. Preventative Maintenance ...................................................................34

. Page

Next Generation

Signal Enhancement

1. Document History

Document

Number Document

Name Document

date Author Edited

by Approved by Revision

DB5R

Dual

Band

Repeater

October

2007

Revision Revised Section Date/Sign

Intentionally Left Blank

. Page

Next Generation

Signal Enhancement

2. Disclaimer

Every attempt has been made to make this material complete, accurate, and

up-to-date. Users are cautioned, however, that Shyam Telecom Limited

reserves the right to make changes without notice and shall not be

responsible for any damages including consequential, caused by reliance of

the contents presented, including, but not limited to, typographical,

arithmetical, or listing errors.

Product name(s) referenced in this document may be trademarks or

registered trademarks of their respective companies, and are hereby

acknowledged.

In areas with unstable power grids (mains) all repeaters must be installed with

a voltage regulator ensuring a constant voltage level at the repeater power

input. A maximum voltage deviation should remain within the input range to

the repeaters for warranty purposes.

All antennas must be installed with lighting protection. Damage to internal

modules, as a result of lightning is not covered in the warranty.

3. Safety Instructions and Warnings

3.1. Personnel Safety

Before installing or replacing any equipment, the entire manual should be

read and understood. The user needs to supply the appropriate AC power to

the Repeater. Incorrect AC power settings can damage the repeater and may

cause injury to the user.

Throughout this manual, there are "Caution" warnings, "Caution" calls

attention to a procedure or practice, which, if ignored, may result in injury or

damage to the system or system component or even the user. Do not

perform any procedure preceded by a "Caution" until the described

conditions are fully understood and met.

3.2. Equipment Safety

When installing, replacing or using this product, observe all safety

precautions during handling and operation. Failure to comply with the

following general safety precautions and with specific precautions described

elsewhere in this manual violates the safety standards of the design,

manufacture, and intended use of this product. Shyam Telecom Limited

assumes no liability for the customer's failure to comply with these

precautions. This entire manual should be read and understood before

operating or maintaining the repeater system.

. Page

Next Generation

Signal Enhancement

CAUTION

Calls attention to a procedure or practice which, if not followed, may result in

personal injury, damage to the system or damage to individual components. Do

not perform any procedure preceded by a

CAUTION until described conditions are fully understood and met.

WARNING! This equipment complies with FCC & IC radiation exposure limits

set forth for an uncontrolled environment. This transmitter must not be co-

located or operating in conjunction with any other antenna or transmitter.

The unit with server antenna must be installed to provide minimum 110 cm

separation distance between the server antenna and the body of user or near

by person. The donor antenna used for this transmitter must be fixed-

mounted on outdoor permanent structures with a separation distance of at

least 1.5 meters from all persons during normal operation.

The RF electric performance of the repeater conforms to FCC requirement of

the inter modulation and spurious emission. It avoids interference problems.

3.3. Electrostatic Sensitivity

CAUTION

ESD = ELECTROSTATIC DISCHARGE SENSITIVE DEVICE

Observe electrostatic precautionary procedures.

Semiconductor transmitters and receivers provide highly reliable performance

when operated in conformity with the intentions of their design. However, a

semiconductor may be damaged by an electrostatic charge inadvertently

imposed by careless handling.

Static electricity can be conducted to the semiconductor chip from the centre

pin of the RF input connector, and through the AC connector pins. When

unpacking and otherwise handling the Repeater, follow ESD precautionary

procedures including the use of grounded wrist straps, grounded workbench

surfaces, and grounded floor mats.

. Page

Next Generation

Signal Enhancement

4. Introduction

4.1. Purpose

The purpose of this document is to describe the electrical and mechanical

specifications, operation and maintenance of the DB5R Dual Band Repeater.

4.2. Scope

This document is the product description of the Shyam DB5R Dual Band

Repeater for outdoor application.

4.3. Definitions

AGC Automatic Gain Control

ALC Automatic Level Control

APC Automatic Power Control

BCCH Broadcast Control Channel

BTS Base Transceiver Station

BSEL Band Selective

CDMA Coded Division Multiple Access

CMC Configuration & Monitoring Console software

CMB Combiner Unit

CSEL Channel Selective

DCS Digital Communication System

DL Downlink signal (from base station via repeater to

mobile station)

EGSM Extended Global System for Mobile Communication

ETSI European Telecommunications Standard Institute

GSM Global System for Mobile communication

LAC Location Area Code of the BTS site

LED Light Emitting Diode

LNA Low Noise Amplifier

LO Local Oscillator

MS Mobile Station

MSC Mobile Switching Center

NMS Network Management System

PCN Personal Communication Network

PCS Personal Communication System

PSU Power Supply Unit

RF Radio Frequency

RMS Remote Management System

RSSI Received Signal Strength Indication

RTC Real Time Clock

TACS Total Access Communication System

TDMA Time Division Multiple Access

UL (Uplink) Uplink signal direction (from mobile station via

repeater to base station)

. Page

Next Generation

Signal Enhancement

4.4. References

[1] ETS 300 086.

Radio Equipment and Systems Land mobile service Technical

characteristics and test conditions for radio equipment with an internal or

external RF connector intended primarily for analogue speech.

[2] ETS 300 609-4.

Digital cellular telecommunications system (phase 2): Base Station

Systems (BSS) equipment specification: Part 4: Repeaters.

[3] ETS 300 342-3

Radio Equipment and Systems (RES); Electro-Magnetic Compatibility

(EMC) for European Digital Cellular Telecommunications systems. Base

Station Radio and ancillary equipment and Repeaters meeting phase 2

GSM requirements.

4.5. General

Mobile Communications Systems are planned as cellular systems and each

cell of the base station is required to provide RF coverage over a certain

geographical area as per defined RF power levels. Due to the RF propagation

properties, even using high radiated RF powers or complicated antenna

systems, there are zones within the coverage area where the RF signal

strength from base station remains inadequate for establishing the desired

connectivity to mobile users.

Repeaters traditionally are deployed in the Mobile Communication network to

fill in the “Dead Zones” caused by blocking of signals by geographic

topologies such as mountains, valleys, dense foliage, high rising urban

landscapes and other man-made structures. The distance from the base

station also adversely affects the RF signal strength. The user views

repeaters as a means to extend base station coverage so as to reduce the

number of base stations and thereby accelerate network availability.

Repeater systems are installed after meticulous planning between BTSs and

the mobile users to provide RF coverage in the shadowed regions. Repeater

systems are available for different applications and ultimate choice shall

depend on some of the factors mentioned below:

• Area to be provided with coverage.

• Indoor/outdoor coverage.

• Availability of BTSs in the vicinity.

• Antenna isolation to be achieved.

. Page

Next Generation

Signal Enhancement

5. Functional Description Of DB5R Dual Band Repeater

5.1. General Description

The DB5R Dual Band Repeater System is designed to provide outdoor

coverage and can handle signals in up to five sub bands with 3+2

configuration (maximum) in two of the service bands, used around the World

by various service operators. It provides highly selective amplification in the

pre-set frequency bands. The details of operating service frequency bands

are given below:

S.NO. Service Band DL Frequency (MHz) UL Frequency (MHz)

1. SMR 800 851-866 806-821

2. Cellular 869-894 824-849

3. SMR 900 935-941 896-902

4. EGSM 925-960 880-915

5. GSM 900 935-960 890-915

6. DCS 1805-1880 1710-1785

7. PCS 1930-1990 1850-1910

8. UMTS 2110-2170 1920-1980

The Customer is requested to refer to the packing list giving the details of

frequency band set & the bandwidths of different sub bands equipped in the

repeater (FCC & IC applications only apply for Cellular & PCS band operations).

• The DB5R repeater is designed to provide optimal coverage, the area

covered shall primarily depend on RF power radiated, manmade

structures in the area (high rise buildings), the geographical topologies

and availability of reflecting surfaces.

• The ultimate performance & coverage shall depend on the obstructions

blocking/absorbing of the RF signals by various objects between the

Server antenna of RF repeater and the mobile users.

• The repeater is specifically designed for the Operators who are

allocated frequency spectrum in different service bands and non-

contiguous sub bands are specified.

• The repeater adopts duplex mode and bi-directional amplification for

U/L & D/L signals between the base station and mobile users.

• It receives signals from the BTS through a DONOR antenna (highly

directional outdoor antenna) and distributes the signals to mobile users

after amplification through a set of SERVER antennas (omni/patch

directional) system in the D/L.

. Page

Next Generation

Signal Enhancement

• In the U/L, the signals from the mobile users are picked up by

SERVER antenna and retransmitted to the BTS after amplification.

• The repeater finds applications in tunnels, highways, large size

airports, and open market areas etc. where traffic requirement is high.

• The system can be incorporated with optional Remote Management

System (RMS) which can be used for configuration and monitoring the

status of the link. It helps not only speedy maintenance but remote

configuration also through wireless modem.

The repeater consists of the following modules/units:

• LNA

• Converter modules

• Power amplifiers

• Power supply module

• Duplexer filters for transmit/receive directions

• Supervisory module

• Diplexer Unit for segregating bands

• A metallic case houses the repeater. Arrangement is made for heat

dissipation especially for amplifiers, which generate more heat. The

choice of suitable metal as the case material gives a lightweight design

with good heat conduction and waterproof protection. The housing

conforms to IP65 (NEMA 5) standards.

. Page

Next Generation

Signal Enhancement

. Page

Donor

Antenna

DB5R

Server

Antenna

Area to be served

RF cable from

server

Power supply

cable

RF cable from

donor antenna

BTS

Figure 1: DB5R Repeater-Different Constituents

Next Generation

Signal Enhancement

Figure 2: DB5R Repeater - Application in a Urban Area

. Page

Next Generation

Signal Enhancement

6. To Get started-Basic Software Control Of the Repeater

6.1. General

The repeater is equipped with a supervisory module that allows the

monitoring and control of various parameters such as RF power, attenuation,

temperature, status of door and alarm conditions etc.

The communication interface between the local terminal and the control

module can be set up using the Configuration & Monitoring Console software

(CMC), which is an easy to use GUI for simple control and monitoring. This

way, the parameters can be easily observed and adjusted from the display

terminal.

This can be performed either via a terminal (PC/laptop) locally, or via remote

is provisioned in the equipment for connecting PC/laptop.

6.2. Terminal Set-up

The system is delivered with software loaded in order to perform configuration

as per requirement. It also enables monitoring the status. Configuration of

parameters can be carried out locally with the help of laptop / PC connected

to the repeater by means of local USB serial interface or remotely via wireless

modem (Optional) mounted inside the repeater. The laptop/PC should be

loaded with the CMC software available on the supplied CD along with the

USB driver.

I) LOGIN-Repeater (Figure 3)

After running the repeater Configuration & Monitoring Console (CMC), user

needs to login the repeater, sequence as under, may be followed:

• Click the “LOGIN” on the command bar.

• Select the user type (ADMINSTRATOR or SUPERVISOR).

• Enter the password.

• Finally click the “OK”.

A message “Logged in successfully” will appear on the screen after

successful login. There are two types of users viz. ADMINISTRATOR and

SUPERVISOR. If user logged in as an ADMINISTRATOR, all the functions

can be performed through the CMC. By default, the password for both

users is “SHYAM”.

SUPERVISOR is allowed to perform monitoring of the status & alarms but

no change in configuration is permitted. However, the SUPERVISOR can

change password if so desired.

II) CONFIGURATION

Configuring repeater means setting the repeater parameters for operation

as per the requirement at site.

. Page

Next Generation

Signal Enhancement

Click on the command bar to display the configuration window, which

allows access to all the configurable repeater parameters. User can login

for configuration of repeater parameters.

• SET is for updating the repeater parameters.

• READ is for confirming the parameters set during the

configuration.

Information as detailed below, can be configured after the

“Configuration” window is activated:

Figure 3: Login Repeater

a. Repeater ID: User can assign a unique repeater ID to each repeater

installed. Up to 10 characters are allowed in this field. (Figure 4)

b. Repeater Location: User can assign the address of location where

repeater is installed. Up to 30 characters are allowed in this field.

(Figure 4)

c. Sub Bands (UL/DL Frequency Bands) Settings: The frequency

bandwidths of all the five sub bands or loaded sub bands in UL & DL

are defined. (Refer Figure 4)

. Page

Next Generation

Signal Enhancement

d. Thresholds Output Power: Maximum Output Power limit in UL & DL

for both the bands are set. A “PA Power high” alarm will be

generated when PA power exceeds the upper limit. (Refer Figure 4)

e. Thresholds RSSI Limits: Lower and Upper RSSI Limits in DL & UL

paths for both the bands are set. A RSSI High alarm will be generated

when RSSI exceeds the set upper limit, and a RSSI Low alarm will be

generated when RSSI goes below the set lower limit set. Upper range

that can be set varies from -35 to -55dBm. Lower range that can be

set varies from -75 to –95dBm. (Refer Figure 4)

Figure 4: Configuration window

f. Sub band ON/OFF: The equipped sub bands are brought in the ON

mode and others are put in OFF condition.

g. PA ON/OFF: User can set uplink and/or downlink PA as ON or OFF

independently for testing/maintenance purpose at the time of

installation for both the bands. (Please refer to Figure 4)

After completing the installation it must be in ON condition only.

h. Attenuation: The information regarding attenuation inserted in UL &

DL for both the bands is displayed.

. Page

Next Generation

Signal Enhancement

Figure 5: Monitoring & Alarm window

III) Monitoring (Figure 5)

In this window, the status of the system is monitored for the following

parameters/conditions:

S.NO. Parameters/Conditions Remarks

1. Frequency Bandwidth for

sub bands

It displays the bandwidth in DL & UL of

each sub band equipped.

2. RSSI (DL) Band 1

Real time value of DL signal level for Band

1 is indicated.

3. RSSI (DL) Band 2

Real time value of DL signal level for Band

2 is indicated.

4. Attenuation Band 1 (DL)

Indicates attenuation inserted in the

system for the band in DL.

5. Attenuation Band 2 (DL)

Indicates attenuation inserted in the

system for the band in DL.

6. Attenuation Band 1 (UL)

Indicates attenuation inserted in the

system for the band in UL.

7. Attenuation Band 2 (UL)

Indicates attenuation inserted in the

system for the band in UL.

8. Output Power Band 1(DL) Real time PA output power in dBm.

9. Output Power Band 2(DL) Real time PA output power in dBm.

. Page

Next Generation

Signal Enhancement

10. Output Power Band 1(UL) Real time PA output power in dBm.

11. Output Power Band 2(UL) Real time PA output power in dBm.

12. Sub band ON/OFF Displays the information about the sub

band equipped.

13. PA (DL) temperature for

band 1. Indicates the temperature of PA.

14. PA (DL) temperature for

band 2. Indicates the temperature of PA.

15. PA (UL) temperature for

band 1. Indicates the temperature of PA.

16. PA (UL) temperature for

band 2. Indicates the temperature of PA.

IV) Alarms (Figure 5)

Details of alarms displayed are detailed below:

S.NO. Alarm Indication Remarks

1. DL RSSI Low (Band 1 &

Band 2) When the low RSSI is detected in any of

the two or both bands, limits as set by the

user.

2. DL RSSI High (Band 1 &

Band 2) When RSSI in DL path exceeds the upper

limit in any of the two or both bands, as set

by the user.

3. DL PA Power High (Band 1 &

Band 2) When PA Power in DL path exceeds the

upper limit in any of the two or both

bands, set by user.

4. DL PA Power Low (Band 1 &

Band 2) When PA Power in DL path exceeds the

lower limit in any of the two or both

bands, set by user.

5. DL Auto PA OFF (Band 1 &

Band 2) When PA Auto OFF is detected in any of

the two or both bands in DL path.

6. DL Manual PA OFF (Band 1

& Band 2) When PA Manual OFF is detected in any

of the two or both bands in DL path.

5. DL PA Temperature High When PA Temperature in DL path

exceeds the upper limit in any of the two

or both bands set by user.

6. UL PA Temperature High When PA Temperature in UL path

exceeds the upper limit in any of the two

or both bands set by user.

7. Synthesizer failure (For

equipped sub bands in DL &

UL)

When the synthesizer in any of the

equipped sub bands fails, relevant alarm

is displayed.

8. LNA failure for Band 1 & 2 in

DL When LNA failure is detected in any of the

bands in DL.

9. LNA failure for Band 1 & 2 in

UL When LNA failure is detected in any of the

bands in UL.

10. ALC band 1` It indicates that ALC limit is exceeded.

11. ALC band 2 It indicates that ALC limit is exceeded.

12. AC fail Failure of AC mains to the system is

indicated by this alarm.

13. 7 V DC (A & B) failure Indicates the failure of 7 V DC supply.

14. 12 V DC failure Indicates the failure of 12 V DC supply.

15. 27 V DC (A & B) failure Indicates the failure of 27 V DC supply.

16. System Temperature Indicates the temperature of the system.

17. Door Open Indicates that the door has been opened.

. Page

Next Generation

Signal Enhancement

Monitoring interval is 3 seconds i.e. after every 3 seconds data on the

monitoring window is refreshed.

A red indication is for Alarm present.

A green indication is for No alarm.

V) Communication Window (Figure 6)

In COMMUNICATION window, user can select serial communication port

of the computer and type of connection between repeater and computer.

There are two types of connections viz. Local and Remote

Local Connection: In this type of connection, User computer COM Port

and repeater’s USB Port are connected directly using cable. Sequence is

given below:

• Click the “COMM.” on the command bar to display the

COMMUNICATION window.

• Select the Connection Type as “LOCAL”

• Select the computer’s Comm. Port where the repeater is

connected.

• Click “OK”.

Remote Connection: This connection is established through Wireless

Modem.

In this type of connection, User communicates from/to remote location

with the repeater using wireless Modem / Cell phone.

To connect:

• Click the “COMM.” on the command bar to display the

COMMUNICATION window.

• Select the Connection Type as “REMOTE”.

• Select the computer’s Comm. Port where the wireless Modem

is connected.

• Click “OK”.

• Now click the DIALUP on the command bar to display the

DIALUP window.

• Enter / Select the repeater phone number.

• Click the “DIAL” and wait (maximum 60 seconds) for

connection.

A message “CONNECTED” will appear on the screen after the GSM

Connection is established.

Click the “DISCONNECT” on the DIALUP window to

disconnect remote communication with the repeater.

Wireless Modem (Optional) is equipped inside the housing of the

repeater and it can be easily located through a sticker provided on the

same. It has a groove with SIM cardholder in which the SIM card can be

inserted for remote communication.

. Page

Next Generation

Signal Enhancement

. Page

CAUTION

When the communication between repeater & PC/Laptop is in progress

through USB:

1. Do not remove cable from the USB port.

2. Do not switch off the repeater.

In case the communication is not required any more, click at EXIT before

removing cable from USB port to avoid hanging of the PC/Laptop. In case

the PC/Laptop goes in to hanging mode, it has to be restarted afte

closin

/switchin

OFF & ON the re

eater.

VI) Security Settings (Figure 7)

The system has two levels of permitting Log in to the repeater to avoid

unauthorized operation. The levels are: ADMINISTRATOR &

SUPERVISOR.

Each level has a specific password. The password for each level can be

changed at intervals. ADMINISTRATOR has rights to perform all

functions Viz. Configuration, Monitoring etc. Whereas the SUPERVISOR

is allowed to perform limited functions like monitoring of alarms,

establishing communication etc.

Figure 6: Communication Window

Next Generation

Signal Enhancement

Figure 7: Password Settings

6.3. Modules In DB5R-Description

The signals intercepted through the Donor antenna in the DL pass through

different modules/units for further signal processing; the detail explanation is

about different modules/units is given below:

a. DONOR Antenna

Donor antenna of appropriate bandwidth & gain interfaces the BTS on one

side and repeater system on other side through RF cable. It is used to

intercept signals from the base station and switch electromagnetic waves

into RF signals in the DL and vice versa in the UL.

. Page

Next Generation

Signal Enhancement

Figure 8: Donor Antenna

The Donor antenna with 16 dB gain transfers the intercepted signals

to the repeater and transmits uplink signals amplified by the repeater.

b. Diplexer

The signals received in the DL, through the antenna are split for individual

band processing. The dual band outputs are fed to two different

duplexers. One Diplexer is also provided before the server antenna in

order to distribute combined signals to mobile users.

In the UL, signals received from server antenna are split and fed to two

duplexers for processing. The amplified signals from both the duplexers

are combined for further transmission through Donor antenna to BTS.

c. Duplexer

The main function of duplexer is to isolate the uplink frequency from the

downlink frequency, i.e. isolate transmit path from receive path. Four

duplexer units are provided in the repeater, two in the Donor antenna side

and two in the server antenna side. Each duplexer transfers/receives

signals from respective diplexer for further connectivity to low noise

amplifier. The bandwidth of the duplex filter depends on the operator’s

frequency band (25MHz, 15MHz, 10MHz, 9MHz, or full Band etc.).

d. Low Noise Amplifier (LNA)

This module is provided after duplexer before the converter. The LNA

provides compensation for the losses suffered by the stream of weak

signals as it passes through splitter/combiner & duplexer (passive

devices). Four LNAs are provided, two each for individual bands in the UL

& DL directions.

. Page

Next Generation

Signal Enhancement

e. Converter Module

The basic block of converter module comprises of L.O., frequency mixer,

filter and intermediate amplifier. The low noise amplified signals are

converted to IF in frequency mixer with frequency fed from LO. The

signals are passed through sharply tuned filters. Number of converters

equipped shall depend on the number of sub bands configured in the

system. Two converters (one for DL & one for UL) for each sub band are

provided.

f. Power Amplifier

It is the core module of repeater. It includes driver stage and final stage. It

is installed directly on the heat sink of the repeater. Driver stage and final

stage of power amplifier are in the same unit. Four power amplifiers with

specific frequency bandwidths & gain are provided, two each for individual

bands in the UL & DL directions.

g. Supervisory

The man-machine communication between the cellular operator and the

repeater is established through this module. One of the two options as

given below can be used for achieving this objective:

• USB interface

• Wireless modem (Optional)

Remote controlling function of repeater can be achieved by equipping

Wireless modem. This arrangement also enables status of repeaters at

different locations to be monitored.

h. POWER SUPPLY

The power supply unit incorporated in the repeater is of high efficiency

and reliability. Different DC voltages required for the operation of

electronic circuitries are derived in this unit. The standard input voltage is

100 to 240 V AC, 47 Hz to 63 Hz. When the power supply varies in this

range and the frequency in 47 to 60Hz, its output DC derived voltages

remain constant within 1% of nominal value.

i. SERVER Antenna

Server antenna transmits signals from the repeater station to mobile users

and transport received uplink signals from the mobile users to the base

station. Based on the coverage area, a set of select panel antennas with

suitable gains & N type connecters is installed at pre-planned spots.

. Page

Next Generation

Signal Enhancement

Figure 9: Server Antenna

. Page

Next Generation

Signal Enhancement

7. DB5R Repeater Specifications

7.1. Electrical Specifications-RF

S.NO. Parameter Specified limits/Remarks

1. Number of Bands Two,

2. Frequency band in DL

path. The bands are customized as per

requirement.

3. Frequency band in UL

path. The bands are customized as per

requirement.

4. Number of RF Sub

bands 5 maximum in 3+2 configuration. Set as per

requirement of the customer.

5. RF composite power

options DL +33 dBm

6. Spurious Emission ≤ 36dBm from 9 KHz to 1 GHz

≤ -30dBm from 1 GHz to 12.75 GHz

7. Automatic Power

Control 25 dB

8. Repeater Gain 85 dB (+-5dB)

9. Attenuation range for

gain adjustment in DL &

31 dB in 1 dB step (Software control)

10. Gain flatness over band ±2 dB

11. Gain variation with

temperature ± 1.5 dB

12. Total delay in the signal

path/direction 5.5 microseconds.

13. Noise figure 5 dB Max.

14. Impedance 50 Ohms

15. Return loss 16 dB

16. Power supply 100 to 240 V AC, 47/63 Hz

17. RMS interface Wireless modem (optional), USB port for local

connection.

7.2. Electrical Specification Power Requirement

Parameters Specified/Limits

Input AC Voltage Range 100-240 V, 47/63 Hz

Power Consumption approx.

175 watts (Varies as per number of sub bands

equipped)

7.3. External Electrical Interface

Parameters Specification

RF port UL N-type (F)

RF port DL N-type (F)

7.4. Mechanical Specification

Dimensions (w x h x d)

60x445x200 mm (22x17x8 inches)

Weight 30 Kg. (72 lbs.)

Housing Metal for Outdoor application

Grounding Connection Bolt

. Page

Next Generation

Signal Enhancement

Housing Color Grey

Cooling Convection

7.5. Environmental Specification

Conditions Specification

Operating Temperature -35oC to +550C (-310F to +1310F)

Storage Temperature -300C to +750C (-220F to +1670F)

Enclosure IP-65 (NEMA 5)

7.6 Contents of Delivery

ITEMS QUANTITY

Repeater DB5R unit 1

PC interface cable for USB port 1

Power cable 3 pin 1

Operation & Installation manual 1

CD containing the application software 1

Wireless Modem (Optional) 1

Repeater Door Key 1 set

Screws, Nuts & Bolts for mounting 1 set

. Page

Next Generation

Signal Enhancement

8. Installation

8.1. Preparation Sheet- Pre Installation

Before the installation commences, a preparation sheet to examine the various

requirements is to be compiled as per detail given below:

1. General

Application: Outdoor

Service Band 1: Frequency Band DL- Frequency Band UL-

Service Band 2: Frequency Band DL- Frequency Band UL-

Number Of Sub Bands: six

Sub Band 1: Frequency Band DL- UL-

Sub Band 2: Frequency Band DL- UL-

Sub Band 3: Frequency Band DL- UL-

Sub Band 4: Frequency Band DL- UL-

Sub Band 5: Frequency Band DL- UL-

2. Technical requirements

S.NO. Requirement Remarks

1. Estimated received signal strength available at

site where donor antenna is to be installed

2. Estimated cable loss from donor antenna to the

repeater unit

3. Estimated DL RF power to the input to the

repeater

4. Desired RF Power in DL

5. Proposed gain settings in DL path

6. Attenuator to be inserted in DL path

7. Estimated cable loss from repeater unit to

server antenna port

8. ERP at server antenna

9. Desired RF Power in UL

10. Proposed gain settings in UL path

11. Attenuator to be inserted in UL path

3. Proposed site Address:---------------------------

4. User’s Address & other particulars:---------------------------------

Date: Prepared by:-------------

. Page

Next Generation

Signal Enhancement

8.2. Engineering Consideration

a. Site Selection

Site selection is one of the most critical decisions affecting the overall

performance of the system. A repeater must be located where it can

receive the maximum signal from the donor site in order to maximize the

repeater’s output and performance, a signal strength greater than or equal

to -75dBm is desired.

Examples of repeater (and accompanying antenna) locations include (but

are not limited to): the roof of a building adjacent to the affected area, with

the antennas mounted at the highest point in the building; the top of the hill

that is obstructing the donor site’s coverage, with the antennas mounted on

poles at ground level or as the situation permits.

Distance from both the donor site as well as from the new area to be

covered must be taken into consideration. The repeater unit should be

located close to the donor site to receive maximum signal strength and at

the same time is located in the vicinity of area where coverage is desired.

In addition, the donor antenna associated should have line of sight with

BTS site to reduce the effects of fading.

Another important issue when choosing a repeater location is the

availability of commercial power. Sites where repeater unit is installed

should be easily accessible for the maintenance team.

b. Antenna Selection and Placement

Proper selection of the repeater’s donor and server antennas is crucial in

designing the repeater system. Good antenna characteristics help to

provide proper isolation between the server (coverage) and donor

antennas, which helps to prevent feedback. An isolation of at least 15dB

more than the gain setting of the repeater is required. If the isolation is less

than the repeater gain, oscillation will occur.

Specific ways to achieve proper isolation include: using high gain,

directional antennas with good Front to Back ratios (25dB or better);

physical separation of the repeater’s donor and server antennas; and

external shielding between antennas. A high gain antenna will help

minimize overall path loss to achieve the desired output power. Donor

antenna gains are typically 16 dB, while server antennas with proper

gains are installed.

• The antennas should have proper frequency band of operation.

• Adequate separation is to be ensured from the power lines to

avoid damage to the equipment and humans.

. Page

• Antenna with proper characteristics to maintain adequate isolation

to avoid oscillations. Normally, isolation should be 15 dB more

than the gain set for the repeater. It should have good front to

back ratio.

Next Generation

Signal Enhancement

• The beam width for the DONOR antenna should be as small as

possible.

• The beam width for SERVER antenna is 60 degree to 120 degree.

• There should be adequate vertical & horizontal separation

between the DONOR & SERVER antennas to avoid interference

and noise. Separation can be determined by the mathematical

formulas:

Vertical Separation:

Isolation (dB) = 28 + 40 log (D/ʎ in m)

Horizontal Separation:

Isolation (dB) = 22 + 20 log (D/ʎ in m) – (Gain of donor antenna

+ gain of server antenna)

D-Distance between donor & server antennas in m

ʎ- wavelength in m

The following table is an approximate guide to antenna

separation.

The use of highly directional antennas with good front to back

ratios can help to reduce isolation requirements.

VERTICAL ANTENNA

SEPARATION HORIZONTAL ANTENNA

SEPARATION

Separation (m.) Isolation (dB) Separation (m.) Isolation (dB)

5 75.0 5 45.5

10 87.1 10 51.7

20 99.1 50 65.5

30 106.2 100 71.5

40 111.2 150 75.1

50 115.0 250 77.6

Vertical and Horizontal Antenna Separation @ 900 MHz

The antenna separation table demonstrates that vertical separation yields

better results than horizontal separation. However, when desired isolation

cannot be met due to insufficient separation, external shielding can help; for

example, mounting the antennas on either side of a rooftop penthouse or

using some type of grounded metal screen or wire mesh (so called chicken

wire) between antennas.

The following example illustrates the various signal levels and antenna gains

needed to form a properly functioning repeater system.

Received Signal Level -72 dBm

Donor Antenna gain 16 dBi

Cable loss (100 ft. of 7/8 inch) 2 dB

Input to Repeater -62 dBm

Gain of Repeater set 85 dB

Output of Repeater +33 dBm

. Page

Next Generation

Signal Enhancement

Cable loss (100 ft. of 7/8 inch) 2 dB

Server Antenna Gain 9 dBi

Repeater ERP +41 dBm

c) Overlapping Coverage

Ideally, the repeater system will be engineered with minimal overlapping

coverage between the donor base station and the repeater. However, the

mobile users will occasionally receive signals from both the donor and the

repeater at similar levels. This situation is comparable to a mobile receiving

multiple signals at varying times due to multi-path propagation.

This repeater contributes a maximum signal delay of 5.5 microseconds in

one direction.

d) Call Processing

The mobile communication system perceives calls handled by the repeater

as actually being handled by the donor site (BTS); the repeater is just an

extension of the base station’s coverage. Therefore, the donor handles call

initiation, power control messages, hand-over requests, etc., for mobiles in

the repeater area. When the base station assigns a channel to the mobile,

that channel is sent through the repeater and then reradiated under the

same frequency. Since the repeater is technically part of the base station,

no hand-over takes place when a mobile moves from the repeater’s

coverage area to that of the base station. When the mobile moves from the

repeater’s area to a neighboring site, the base station handles the hand-off

in the same way as for a mobile in the base station area.

8.3. Installation Tools

You will need the following basic tools for installation:

a. Standard wrenches/screwdrivers/cable stripper/cable cutter/pliers set

for installing the DB5R Unit and antennas. (Refer to the

manufacturer’s recommendations for installing the antennas).

b. RF coaxial cable connection tools for installing connectors.

c. Multi-meter.

d. Mobile handset loaded (e.g. Nokia) with Net engineering software to

be used for signal level measurement.

e. Magnetic compass for measuring the azimuth of the BTS and

repeater site.

8.4. Installation Procedure

The DB5R repeater has been designed for outdoor applications. The repeater

unit shall be mounted vertically to a mast, which means the RF connectors

will be at the bottom side.

In case of wall mounting, minimum physical separation between the repeater

housing & the wall should be 50 mm.

Furthermore, the repeater shall be mounted in a way so that there is free

access to the individual units, while the door of the repeater is open.

. Page

Next Generation

Signal Enhancement

The repeater is mounted at the pre-selected site firmly placed with clamps

and other mechanical accessories. Connections as detailed are carried out:

• RF cable routed from DONOR antenna is connected at the BTS port as

indicated.

• RF cable routed to SERVER antenna is connected at TX/RX port for

signal distribution.

• For energizing the system, the cable from AC mains is connected at

AC mains port, range 100-240 V.

• USB port is provided for carrying out configuration and monitoring.

Important: Grounding of the unit has to be ensured before extending the

power to the repeater system.

Following points need considerations for laying of RF cable:

1. RF coaxial cable installation must comply with local or National Electrical

Codes. The cable shall have nominal 50-Ohm impedance. Routing of the

RF coaxial cables is to be as per the site installation plan.

2. Fix the supplied connectors to the RF coaxial cable and verify the

following:

• The center conductor to outer shield of RF coaxial cable indicates an

“Open Circuit” condition.

• Check for any short circuit between center conductor and outer

shield.

• Place short between the center conductor and outer shield using a

piece of wire temporarily and check the other end of conductor for

any break in the RF cable.

8.5. Repeater Gain Settings

The repeater gain setting is one of the vital parameters since it also decides

the area to be provided with RF coverage. The noise contribution has to be

minimum while setting the gain hence it should be set with utmost care. The

variation in gain up to 31 dB in steps 1 dB is possible to be achieved with the

help of software control attenuator, provided in the system. The gain setting

for Uplink and Downlink path is independent of each other.

For example, if repeater has a maximum gain of 85 dB and the required

repeater gain is 60 dB, the attenuation of 30 dB is required to be incorporated

by inserting attenuator of this value.

Note: Repeater gain should be at least 15 dB less than the antenna isolation.

Signals intercepted by DONOR antenna from BTS and transmitted to the

repeater are termed as Downlink/Forward signals and the signals originated

by mobile users and intercepted by SERVER antenna for application to

repeater are termed as Uplink/Reverse signals.

a. Forward Gain Setting

The process of setting the forward gain is very simple. Forward signal

level strength can be measured using NET engineering software in any

NOKIA handset e.g. NOKIA 6210 or any other engineering mobile

handset.

. Page

Next Generation

Signal Enhancement

Alternatively, RF output power of repeater can be measured using the

visual indication shown on the display panel of the repeater.

Once the RF output power has been determined, the attenuation will have

to be modified to reach the desired output signal level.

The gain of repeater can be set using any of the following methods:

a. Local manual mode (using built in key pad and display)

b. Local USB serial interface mode (GUI based)

c. Through (optional) wireless modem.

b. Reverse Gain Setting

For reverse gain setting, a 31 dB variable attenuator is provided; the

required value can be inserted for the desired gain. The gain is set to

such a value so as to cause minimum interference at the base station but

high enough to ensure a strong signal.

Generally, reverse gain is set 5db less than the forward signal.

8.6. Commissioning

Note:-Repeater should not be connected to Power without termination

of the antenna connection. The termination can be performed either by

the antenna connection as well as a dummy load or the 50

Ω

terminated connection of a measuring instrument (Power Meter,

Spectrum analyzer with appropriate PAD)

After setting the gain, verify the parameters:

1. DL RF power radiated in the set frequency band.

2. Received RF power in the DL.

3. UL RF power radiated in the set frequency band.

4. Received RF power in the UL.

5. Record the value of attenuation introduced for setting the gain.

8.7. Dos & Don’t Dos

The site should be accessible for the maintenance team.

1. Arrangement is to be made to avoid unauthorized access to the repeater.

2. Proper grounding of the repeater is required to be done to avoid damage

to the system.

3. For outdoor applications, the housing must be waterproof.

4. Stable power supply for repeater unit should be ensured.

5. The route of Cables to/from antennas should be short to limit the cable

losses and should be free from sharp bends & kinks.

6. Local standard of cabling should be followed.

7. The donor antenna should have proper line of sight with the BTS from

where the signals are to be intercepted for maximum signal strength and

to reduce the effect of fading.

8. There should be adequate separation between the cables (antenna

system) and the power lines to avoid damage to the equipment & injury

to humans.

10. The selection of BTS should be made taking other BTSs in the same

vicinity in to consideration to avoid interference.

. Page

Next Generation

Signal Enhancement

11. Gain of the repeater should be set after taking antenna isolation in to

consideration.

12. The estimation of coverage area should be confirmed.

13. The system should be made over for normal traffic after actual

measurement of:

a) RF power in the DL

b) RF power in the UL

c) Antenna Isolation

d) Gain settings in DL & UL

14. Feedback regarding performance of the system must be obtained from

the user.

. Page

Next Generation

Signal Enhancement

8.7.Checklist – Post Installation

After the installation of the system is accomplished, points as indicated in the

checklist are verified.

Service Bands Particulars:

Frequency Band for Band 1 DL

Frequency Band for Band 1 UL

Frequency Band for Band 2 DL

Frequency Band for Band 2 UL

A. Repeater Installation

S.NO. Point(s) To be Verified Remarks

1. Ensure isolation between server and donor

antennas, it has to be 15 dB + Gain set of the

repeater.

2. Actual isolation measured

3. Ensure proper grounding of the unit

4. Cable from donor antenna connected to donor

antenna port

5. Cable from server antenna connected to the

relevant port in the unit

6. Mains cable connected to the repeater unit

7. Cable protection ensured and outdoor connections

are waterproof

B. Repeater Set Up

S.NO. Point(s) To be Verified Remarks

1. Number of sub bands equipped

2. Number of Sub band(s) in Band 1 with frequency

bandwidth of each.

3. Number of Sub band(s) in Band 2 with frequency

bandwidth of each.

4. Repeater switched ON

5. Any error (alarms) observed

6. Gain set

7. Power level in DL

8. Attenuation in DL

9. Power level in UL

10. Attenuation in UL

11. Observation on CMC software & GUI

12. Repeater secured & locked

Any Other Remark/Comment:

Date Of Installation:------------------------ Repeater ID & Site Address:---------------

Name of the Installer:-----------------------------------------------------

. Page

Next Generation

Signal Enhancement

9. System Maintenance

9.1. General

The system normally operates without any operator intervention or

maintenance. If, in the unlikely event of a unit failure, the field replaceable

units (antenna unit, cables) should be checked for faults and the system

restored. The faulty unit can be removed and replaced with a spare while the

rest of the system is still operating. Soldering or local repair of the modules

should be avoided for better maintenance point of view. Faulty module/unit

should be replaced with genuine spares from Shyam Telecom Limited only.

However, the power supply of the failed repeater should be isolated from AC

mains and DC power before any module is replaced. In the event of a

system malfunction, the status of the antenna systems should be checked

as well as the continuity of the cabling before replacing any modules within

the repeater.

9.2. Preventative Maintenance

The DB5R repeater does not require any preventative maintenance.

. Page

Next Generation

Signal Enhancement

For Technical Support, please contact at any of the following addresses:

For Americas

Shyam Telecom Inc.

6, KILMER ROAD, SUIT D,

EDISON, New Jersy-08817 (USA)

For Europe

Shyam Telecom GmbH.

Frohsinnstrasse 16, 63739 Aschaffenburg, Germany

Tel: + 49-6021-45901-0 Fax: + 49-6021-45901-29

For ASEAN & Others

Shyam Telecom Ltd.

246, Phase IV, UDYOG VIHAR,

GURGAON – 122015 (INDIA)

Tel: +91-124-4311600 FAX: +91-124-4018117

Email: contact@shyamtelecom.com

. Page

Shyam Telecom DB5R33-8501900 Dual Band Repeater Cellular-850 + PCS-1900 User Manual User s manual for

Shyam Telecom Inc. Dual Band Repeater Cellular-850 + PCS-1900 User s manual for

Contents

Users Manual

Navigation menu

Namespaces

Views

Navigation