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The whole FSR system consists of two parts: Donor Unit and Remote Unit. They transparently convey and amplify the wireless signal between the BTS (Base Transceiver Station) and mobiles via RF wave at different frequency from the BTS.
The Donor unit receives the BTS signal via a direct coupler closed to the BTS (or via open air RF transmission through the Donor Antenna), then converts it from the working frequency to the link frequency, and transmits the amplified signal to the Remote Unit via the Link Antennas. The Remote Unit will reconvert the signal to the working frequency and provide the signal to the areas where network coverage is inadequate. And the mobile signal is also amplified and retransmitted to the BTS via the opposite direction.
Cable-Access FSR: to receive BTS signal via a direct coupler closed to the BTS (recommended); Wireless-Access FSR: to receive BTS signal via a Donor Antenna (applicable when no line of sight can be viewed between the Donor Unit and the Remote Unit as the Donor Unit is installed on the BTS tower). In-Band FSR: the link frequency is within the working band of BTS; Out-of-Band FSR: the link frequency is out of the working band of BTS.| Pro | Con |
|---|---|
| No more self-oscillation and easy to choose installation location; For Cable-Access type, pure BTS signal picked up by the Donor Unit will greatly reduce the signal noise; The Remote Unit can be installed out of the BTS coverage; A full 360-degree coverage can be realized. | The total cost of equipment is higher; A certain frequency resource is required to be occupied as the Link Frequency; A line of sight shall be viewable between the Link Antennas. |
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