Dekolink Wireless FBDASMR850WD User Manual

Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- 190-9180
e-mail: [e-mail]

web www.dekolink.com

INSTALLATION AND

OPERATION INSTRUCTIONS

FOR

FiberLink

BI-DIRECTIONAL AMPLIFIER

WITH DIVERSITY

MW-FBDA-SMR8-50W-DIV

Dekolink Wireless Proprietary and Confidential Information. Copying, Distribution, and Disclosur

rev3 08/03 Page 1 of 17

prohibited without Express Authorization from Dekolink Wireless Company.

This document is protected by all applicable copyright laws.

e are

Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- 190-9180
e-mail: [e-mail]

web www.dekolink.com

TABLE OF CONTENTS

Para No.

1. OVERVIEW 3

2. COMPONENT DESCRIPTION 5

2.1 DUPLEXER 5

2.2 UPLINK AMPLIFIER 5

2.3 50 WATT DOWNLINK POWER AMPLIFIER 5

2.4 FIBEROPTIC TO RF TRANSCEIVER 5

2.5 RFIBER TRANSMITTER 7

2.6 MONITOR UNIT 7

2.7 POWER DISTRIBUTION UNIT 10

2.8 POWER SUPPLY 10

3 SPECIFICATIONS 11

3.1 RF SECTION SPECIFICATIONS 11

3.2 FBDA ALARM SPECIFICATIONS 12

3.3 MECHANICAL SPECIFICATIONS 12

3.4 ENVIRONMENTAL CONDITIONS 12

Paragraph

Page No.

4 RF EXPOSURE WARNING 13

DEKOLINK WIRELESS LIMITED WARRANTY 17

LIST OF FIGURES

Fig No.

1 FBDA RF BLOCK DIAGRAM

2 RFIBER FRONT PANEL

3 RFIBER REAR PANEL

4 MONITOR OUTLINE

5 FIBERLINK ALARM BLOCK DIAGRAM 9

6 FBDA SYSTEM BLOCK DIAGRAM 14

7 MECHANICAL LAYOUT 15

8 MECHANICAL OUTLINE 16

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Fig. Name

Page No.

4

6

6

8

Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- 190-9180
e-mail: [e-mail]

web www.dekolink.com

1. OVERVIEW:

The FBDA is an interface unit between optical signals carrying RF information, and RF

antennas covering a defined user area. The system consists of uplink path and

downlink path and an additional uplink path for diversity.

The uplink path receives RF signals from the Mobile antenna amplifies them and the

Rfiber+ converts them to optical signals. These optical signals are sent to the BTS.

The downlink path receives optical signals from the BTS to the Rfiber+, converts them

to RF signals and amplifies these signals using a high power amplifier. The Mobile

antenna transmits these RF signals.

A duplexing filter separates the frequencies of uplink path from the downlink path

enabling the use of the same antenna for receiving and transmitting. The FBDA

provides about 46 dB RF GAIN in both directions.

Both optical signals for Uplink and Downlink are carried on a single fiber using WDM.

The Rfiber+ RF output power is aligned to 0 dBm for proper operation. Downlink gain

can be adjusted using a step attenuator for required output power.

Uplink gain can be adjusted by 16 dB continuous trim pot on the uplink pre amplifier.

The downlink path uses a 50 Watt power amplifier while the uplink uses an AGC pre-

amplifier to drive the uplink F/O transmitter. The AGC is set to 0 dBm, which is the

max power permitted by the F/O transmitter.

For diversity reasons there is an additional Uplink path consisting of Cavity band pass

filter, AGC pre-amplifier, and Fiber optic transmitter. The optical signal of this path is

transferred via an additional fiber to the base station.

rev3 08/03 Page 3 of 17

Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- 190-9180
e-mail: [e-mail]

web www.dekolink.com

TO BTS

Fig. 1 : FBDA RF BLOCK DIAGRAM

Optical

Fiber

Downlink / Uplink

Optical

Fiber

Uplink

(diversity)

WDM

Fiberoptic

Receiver

Fiberoptic

Transmitter

Fiberoptic

Transmitter

UP LINK

AMP

UP LINK

AMP

Step

Attenuator

AGC

AGC

Down link Power

Amplifier

TX

Duplexer

RX

Variable

Attenuator

Rx1

Filter

Variable

Attenuator

rev3 08/03 Page 4 of 17

Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- 190-9180
e-mail: [e-mail]

web www.dekolink.com

2. COMPONENTS DESCRIPTION:

2.1 DUPLEXER(x2)

The duplexer serves to frequency separate uplink signals from downlink signals. The

duplexer has sharp out of band attenuation for better isolation between the receiving

and transmitting paths and for better rejection of interfering signal in the air. In the

Diversity path only the Rx part of the duplexer is used.

2.2 UPLINK PRE-AMPLIFIER(both Rx pathes)

The uplink pre-amplifier is a low noise, 45dB gain unit. The amplifier contains AGC

control circuitry. When a high power signal is received the automatic level control

detects it and reduces the gain so that the output power of the amplifier is constant.

The AGC function limits the signal at the Fiberoptic transmitter input when high power

signals are received while keeping high gain when low power signals are received.

The LED on the amplifier illuminates when the power output of the amplifier exceeds

the AGC power set limit (when the AGC is either ON or OFF).

The Switch on the RF amplifier enables the AGC function. If the AGC is disabled then

the amplifier gives maximum gain for any input.

The AGC level is factory set to 0 dBm and AGC is set to ON, to prevent high power

damage at the Rfiber+ input.

2.3 50 WATT DOWNLINK POWER AMPLIFIER

This is the downlink power amplifier. It can drive 40 dBm composite power to the
mobile antenna. A thermostat attached to this amplifier turns on TEMP alarm when the
temperature exceeds 80° C.

2.4 Fiberoptic to RF transceiver

The RFiber+TM product is a transceiver that includes a transmitter and receiver unit.

The transmitter converts the RF signals into light wave signals, which are then sent

over fiberoptic cables. The receiver converts light wave signals back to RF

The model in use is a wide band product in the 0.08-2 GHz frequency range and it

includes a WDM module to enable use of one fiber for Tx and Rx signals.

rev3 08/03 Page 5 of 17

Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3- 190-9180
e-mail: [e-mail]

web www.dekolink.com

The RFiber+TM main features are:

1. Protocol transparency; i.e. any standard can be faithfully transmitted.

2. An optional serial port (RS232) is installed into each unit. This port allows

data communication over the same fiberoptic cable.

3. Max. input RF power for normal operation – 0dBm.

4. Manual Gain Control is standard in receiver to compensate for optical loss

across the fiber.

TM

The following drawings show sample front and rear panels of the RFiber+

(for WDM model there is only one optical in/out port).

unit

Fig. 2 : - RFiber+TM Front Panel

Fig. 3 : - RFiber+TM Rear Panel

On the Front Panel of the RFiber+

TM

unit (Fig 2.) are three LEDs. The LEDs should be

on when the unit is in use. The following table describes the LEDs.

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