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Distributed Base Station DBS3900

This modular unit is designed to be installed far from other units — speeding up site selection and network construction and saving investment in repeaters. It enables flexible coverage along railway lines, especially tunnels and bridges. It consists of a Baseband Unit (BBU) and a number of Remote Radio Units (RRUs), creating a single powerful cell over multiple sites.  

The DBS3900 supports both GSM-R and eLTE. The GSM-R system can be upgraded to eLTE for Railway via software, with no need to replace hardware. Its low power consumption makes it possible to be powered by green energy, such as solar power, wind power, and biogas.



Parameters Specifications
Working Frequency Bands
  • 876 to 880 MHz and 921 to 925 MHz
  • 880 to 915 MHz and 925 to 960 MHz
  • 1,710 to 1,785 MHz and 1,805 to 1,880 MHz
  • One BBU supports six RRUs. 
  • Each RRU supports a maximum of six levels of cascading.
  • Each RRU supports two carriers.
Networking A maximum of 12 subsites are allowed to serve one cell. Each subsite supports three RRUs.
Transmit Power
  • 918 MHz to 925 MHz: 2 x 60W
  • 925 MHz to 960 MHz: 2 x 80W
Receiver Sensitivity
  • 918 MHz to 925 MHz: Single antenna: -112.5 dBm, Double antennas: -115.5 dBm
  • 925 MHz to 960 MHz: Single antenna: -113.4 dBm, Double antennas: -116.4 dBm
BBU3900 Size (H x W x D) 86 mm x 442 mm x 310 mm
RRU3004 Size (H x W x D) 480 mm x 356 mm x 100 mm
RRU3004 with housing Size (H x W x D) 485 mm x 380 mm x 130 mm
BBU3900 Weight Typical: 7 kg; maximum: 12 kg
RRU3004 Weight 15 kg without housing; 17 kg with housing
BBU3900 Input Power
  • -48V DC; voltage range: -38.4V DC to -57V DC
  • +24V DC; voltage range: +21.6V DC to +29V DC
RRU3004 Input Power
  • -48V DC; voltage range: -36V DC to -57V DC
  • 220V AC; voltage range: 176V AC to 290V AC for RRU3004 of the E frequency band

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