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TUNNEL

Delivering a reliable and seamless mobile communications for underground subway and tunnels presents operators with many challenges due to the limitation of RF propagation and penetration. For the most part subscribers in these areas are unable to receive mobile signals to establish a call connection. In order to provide coverage to these areas, a cost effective and reliable solution may come from a RF or fiber optical repeater.Deployment example 1:A 4km tunnel is served with two 5W repeaters.


As the diagram illustrates, donor antennas are located on both ends of the tunnel. Signals received from the BTS are amplified and then projected into the tunnel through the service antenna, providing coverage to the length of the tunnel.


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