Distributed Base Station DBS3900
This modular unit is designed to be installed far from other units — speeding 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 can support both GSM-R and eLTE. The GSM-R system can be upgraded to eLTE for Railway by software — there’s no need to replace hardware. Its low power consumption makes it possible to be powered by green energy — solar power, wind power, and biogas.
Base station provides cost-effective, powerful, and flexible communications for railways
- Simplified structure, consisting of only BBUs and RRUs, requires only a small number of spare parts and reduces maintenance costs
- RRUs can be installed on a tower, reducing feeder costs and feeder loss and increasing system gain by 3 dB to 5 dB
- Remote radio frequency technology enables distributed RRU installation, which is perfect for railways
- Multiple-site cells extend cell coverage areas and reduce the number of inter-cell handovers previously required
| 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 |
| Capacity | 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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