Fiber-Span FS31 Series Manual do utilizador - Página 3
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Product Overview
Fiber-Span provides product to enable RF signal to be distributed via optical fiber
cable. RF signal sources can be used from over the air (OTA) from a Radio Base
Station (BS), OTA from handheld devices, or directly from a BS radio. RF signals
are converted to modulated light for transport through optical fiber media to remote
locations. Modulated light is converted back to the original RF signal where it is
processed through filtering and amplification to allow the RF signal to be re-radiated
in the remote location. In a bi-directional RF system, the process is the same
resulting in remote RF signals that are sent back simultaneously.
Fiber-Span product functionality
OTA system - RF signals from a remote base station are interchanged usually from
a roof top antenna that is connected to an Integrated Head-end Unit (IHU). The IHU
receives downlink signals from the base station and sends uplink signals back to the
base station. The IHU distributes signals via fiber optics to remote location and also
is capable of simultaneously interfacing with a Distributed Antenna System (DAS)
for short range RF distribution.
Remote Base
Station
Local Base Station System – Signals from a local base station interface to optical
distribution equipment through Base Station Units (BSU), or directly to a Fiber
Transceiver Unit (FTU). The BSU sometimes interfaces the Base Station to the
FTU. The BSU is used to passively condition RF levels or serve as RF filters when
applicable.
signals are sent to the Remote Repeater Unit (RRU). The RRU is designed for use
as a remote end of a bi-directional RF distribution system. The RRU RF port works
with a direct connected RF antenna or to a Distributed Antenna System (DAS).
The RRU is connected via optical fibers to a Fiber Transceiver Unit (FTU) to
complete a point to point RF link.
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IHU
DAS in
Building
Figure 2. Typical OTA Optical RF distribution System
The FTU performs bi-directional optical-RF conversions.
Rev 01 5-DEC-06
RRU
Optical
Fiber
DAS in
Building
Optical
Fiber Optic RF Repeater System