Shenzhen Guanri Netcom Technologies Co., Ltd.
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GSM 900MHz Frequency Shift Repeater (In-band )

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GSM 900MHz Frequency Shift Repeater (In-band )
Detailed Description

GSM 900MHz In-Band Frequency Shift Repeater
signal is relayed via radio frequency wave of frequency different from BTS

The Frequency Shift Repeater (FSR) is designed to solve problems of weak mobile signal, which can expand more coverage than RF repeater and reduce investment for the areas where fiber optic cable is not available.


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.


As per the method of receiving BTS signal by the Donor Unit, two types of FSR are available:

  • 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).

    And both types of FSR can be sorted into 2 sub-categories as per the availability of link frequency:

  • 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.

    See the overview of Repeater .


    Application Diagram of Cable-Access FSR


    Application Diagram of Wireless-Access FSR



    • Aluminum-alloy casing has high resistance to dust, water and corroding;
    • Best solution to eliminate mutual interference due to sharing the same frequency;
    • No stringent isolation requirement for antenna installation;
    • Easy to choose installation site;
    • RS-232 ports provide links to a notebook for local supervision and to the built-in wireless modem to communicate with the NMS (Network Management System) that can remotely supervise repeater’s working status and download operational parameters to the repeater.


    To expand signal coverage or fill signal blind area where signal is weak or unavailable.

    • Outdoor: Airports, tourism regions, golf courses, tunnels, factories, mining districts, villages, highways…
    • Indoor: Hotels, exhibition centers, basements, shopping malls, offices, parking lots, …

    The FSR is mainly applicable to such case:

    • The area to be covered is far away from the BTS and has no fiber optic connection;
    • The distance between the BTS and the area to be covered is 20 km around.

    In comparison with RFR (RF repeater) and FOR (fiber optic repeater), the FSR has the following benefits and disadvantages:


     Donor UnitRemote Unit
    Working Frequency (customizable)Uplink890~915MHz
    Link FrequencyCustomizable
    Transmission Distance≤ 20km
    No. of Channels (for channel shift)1 or 2
    Frequency Error≤ 0.05ppm
    Output Power (customizable)UplinkCable-Access: ≥ 0dBm
    Wireless-Access: ≥ 30dBm
    ≥ 33dBm
    Downlink30~40dBm (1W~10W)37~43dBm (5W~20W)
    Downlink Input LevelCable-Access: ≥ -10dBm / Wireless-Access: ≥ -70dBm
    GainCable-Access: ≥ 45dB
    Wireless-Access: ≥ 85dB
    ≥ 90dB
    Gain Adjustment Range1~31dB @ step of 1dB
    Voltage Standing Wave Ratio (VSWR)< 1.3
    Noise Figure< 5dB (only for uplink)
    Spurious EmissionWithin working band≤ -15dBm/30kHz
    Out of working band
    (Δf > 2.5MHz)
    9kHz~1GHz: ≤ -36dBm/100kHz
    1GHz~12.75GHz: ≤ -30dBm/30kHz
    In-Band Intermodulation Attenuation≤ -40dBc/30kHz
    Out-of-Band SuppressionPer bandΔf > 2.5MHz: < -40dBc (downlink); Δf > 10MHz: < -60dBc (uplink)
    Per channelΔf > 1.98MHz: < -44dBc (downlink); Δf > 1.98MHz: < -38dBc (uplink)
    In-Band Ripple≤ 3dB p-p
    System Delay≤ 10μSec
    I/O Impedance50Ω
    RF ConnectorN-Type (Female)
    Temperature RangeOperation: -25°C ~ +55°C / Storage: -30°C ~ +60°C
    Relative Humidity Range≤ 95% (non condensing)
    Power Supply (customizable)DC +24V / DC -48V / AC 220V±15%, 50Hz / AC 110V±15%, 50Hz
    Backup Power Supply (optional)4 hours
    Casing LevelIP65
    Dimensions630mm X 400mm X 230mmOutput power @37~40dBm: 570mm X 325mm X 215mm
    Output power @40~43dBm: 630mm X 400mm X 230mm
    Weight33kgOutput power @37~40dBm: 27kg
    Output power @40~43dBm: 35kg
    Remote Monitoring/Control via NMSSupported
    ALC (Automatic Level Control)Supported
    Frequency Shift Repeater

    In-Band FSR -
    RPT865 (GSM 900MHz) / RPT885 (GSM 1800MHz) / RPT895 (GSM 1900MHz)
    RPT915 (CDMA 450MHz) / RPT935 (CDMA 800MHz) / RPT995 (CDMA 1900MHz)
    Out-of-Band FSR -
    RPT866 (GSM 900MHz) / RPT886 (GSM 1800MHz) / RPT896 (GSM 1900MHz)
    RPT916 (CDMA 450MHz) / RPT936 (CDMA 800MHz) / RPT996 (CDMA 1900MHz)

    We have a very strict quality controling system which promise that Repeater we produce are always of best quality!We have confidence that you will satisfy with our products and service.Welcome your negotiated prices,we promise your good price will be our consideration.Above items are just a part, many more Cisco products are not listed out, please feel free contact us for more details. Thank you for your attention

    Company information:
        Our company name is Shenzhen Guanri Netcom Technologies Co., Ltd. Which established in 2007 . We is an exporter of China (Mainland) CCTV System products.    Our products have been sold well in North America South America Eastern Europe Southeast Asia Africa Oceania Mid East Eastern Asia Western Europe! Our company firmly insists on that product quality is the life source of an enterprise.    If we don't have idea of what you're looking for, please call or e-mail with your ideas and we may be able to make you something completely unique!Please vist our website at and use the contact form for a faster response!
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    Shenzhen Guanri Netcom Technologies Co., Ltd.
    Ms. Chase Wan
    3/F, Building R3-B, High-Tech Industrial Park, Nanshan district, Shenzhen 518057 P.R.China

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