Helios® Fiber Optic Repeaters (FOR) system is designed to solve problems of weak mobile signal in the place that is far away from the Base Station (BTS) and has fiber optic cable network underground. The Fiber Optic Repeater (FOR) system consists of two parts: Donor Unit and Remote Unit. The Donor Unit captures the BTS signal via direct coupler closed to BTS, the converts it into optic signal and transmits the amplified signal to the Remote Unit via fiber optic cable. The Remote Unit will reconvert the optic signal into RF signal and provide 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.

As per the method of receiving BTS signal by the Donor Unit, two types of FOR are available:
1. Cable-Access FOR: The receive BTS signal via a direct coupler closed to the BTS (recommended);
2. Wireless-Access FOR: To receive BTS signal via a Donor Antenna (applicable when no fiber optic cable connecting to the BTS); Can be sorted into 2 sub-categories: Band-Selective and Channel-Selective.


Features
1. Comply with relevant regulation spectrum usage
2. Aluminum-alloy casing with IP65 protection and compact design, cool system without fan
3. ALC and AGC to ensure stable operation
4. Option channel Selective 1, 2, 4, 6, 8 for Wireless Access application
5. Easy to install on wall or pole
6. One Donor Unit can support up to 4 Remote Units to maximize utilization of fiber optic cable
7. Max transmission distance between Donor Unit and Remote Unit is 20KM

8. Adopting WDM (Wavelength Division Multiplexing) module to realize long distance transmission
9. Adopting filter with highly selectivity and low insertion loss eliminates interference between uplink and downlink
10.2 RS-232 or RJ45 ports provide links to laptop for local test or to built-in wireless modem for communication with the NMS
11. Built-in wireless modem (Option) for remote monitoring by SMS, GPRS or TCP/IP.
12. Details repeater parameters and status can be monitoring by built-in web interface, such as RSSI, temperature, output power level, gain, ATT, return loss, VSWR etc.
13. Support upgrading firmware remotely by GPRS.
14. High gain linear power amplifier technique with reliable performance

Technical Specifications
Frequency Range (Customized):
Uplink: 450-457.5MHz/824-849MHz/1880-1890MHz
Downlink: 460-467.5MHz/869-894MHz/1960-1970MHz
Working Bandwidth: Various bandwidth is available upon request
No. Of Channels: 1, 2, 4, 6, 8 for option
Transmission Distance: Max 20KM (From Donor Unit to Remote Unit)
Max Input Level: +10dBm
Output Power:
Uplink: Donor Unit: Min. -10dBm
Downlink: Remote Unit: Min. +37-+43dBm(5W-20W)

Gain: Remote Unit: Min. 65dB
AGC Control Range: Min 20dB (+/-2dB)
Gain Control Range: 31dB (1dB Step)
VSWR: < 1.5
Ripple in Band: Max +/- 1.5dB
In-band Inter Modulation Attenuation: Comply to ETSI Requirement
RF Connector: N-type Female
I/O Impedance: 50 ohm
Noise Figure: Max 5dB
Group Time Delay: Max 5µ S
Temperature Range: -30 degree Celsius to +55 degree Celsius

Relative Humidity: Max 95%
MTBF: Min. 100000 hrs
Power Supply: DC -48V / AC220V (+/-15%), 50Hz
UPS Backup Power Supply (Optional): 6 hours / 8 hours
NMS Monitor Function: Real-time alarm for Door Status, Temperature, Power Supply, VSWR, Output Power, Gain, Uplink ATT, Downlink ATT and etc.
Remote Control Module (Optional): RS232 or RJ45 + Wireless Modem + Chargeable Li-ion Battery
Approvals and Tests: EN 60950 & ETSI 301 489-1 & ETSI 302 426

Dimension:
Donor Unit: 430mmX250mmx70mm
Remote Unit:
+30dBm-+37dBm: 460mmX405mmx180mm
+40dBm-+43dBm: 605mmX445mmx225mm
Weight:
Donor Unit: 5Kg
Remote Unit: +30dBm-+37dBm: 20Kg +40dBm-+43dBm: 28Kg