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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.
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 45 dB RF GAIN in both directions.
Both optical signals for Uplink and Downlink are carried on two fibers or a single fiber
using WDM.
The Rfiber+ RF output power must be aligned to 0 dBm for proper operation.
The downlink path uses a 50 Watt power amplifier with AGC control. The AGC control
is located on the power connection unit.
Downlink gain can be adjusted using a step attenuator for required output power.
The uplink uses a low power AGC amplifier to drive the uplink F/O transmitter. The
AGC is set to 0 dBm, which is the optimum power permitted by the F/O transmitter.
Uplink gain can be adjusted by 16 dB continuous trim potentiometer on the uplink
amplifier.
Rev1
12/03
Dekolink WIRELESS Ltd.
16 Bazel St. Qiryat-Arieh Petah-Tikva, Israel, 49510
Tel- 972-3-9180-180 Fax-972-3-
e-mail:
marketing@dekolink.com
9180
-
190
web
www.dekolink.com
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