BS421 outdoor base station
Description
BS421 is a single-carrier outdoor base station.
The BS421 can be used as base stations in large networks in areas where moderate traffic capacity is required (three traffic channels with a single BS421, up to 15 traffic channels with up to four BS421s). The BS421 is developed to be used, together with the DAMM SB421 Service Box containing the base station controller software.
The BS421 base station is designed to be mounted in the top of a mast close to the antennas. This eliminates the traditional TX and RX signal degradations due to feeder loss and reduces the cost considerably. It is also ideal as a movable base station mounted in a truck or on a ship. It is designed for harsh climatic environmental conditions and is fully IP65 sealed.
The BS421 is provided with full dual RX diversity for optimal sensitivity, and has a built in duplex filter with an output power to the antenna connector of max 10W. With the elimination of the normal feeder loss it has a Radio performance superior to most other available solutions.
The BS421 is designed for two antennas, one for TX/RX-A and another for RX-B. If antenna positions are limited the BS421 base station can run on a single antenna only (without diversity). In addition, the BS421 is provided with an extension feature, which allows two BS421 to be connected with just two additional jumper cables and still run with full diversity on two antennas.
The BS421 is provided with an internal GPS receiver used for time and frequency synchronization. This allows the BS421 to run full time synchronous with other base stations for optimum cell-reselection. External GPS sync input and output signals allow up to four BS421 to be synchronized from a single GPS antenna and allow external synchronization in e.g. tunnels and other areas where GPS signals cannot be received.
The BS421 also support discontinuous transmission fully GPS synchronized. For normal systems this allows a dramatic decrease in power consumption, as only the active BS421 need to be powered.
The BS421 is connected to external unit’s f. inst. SB421 Service Box with a pre-mounted system connector with just one -48V DC power cable and one standard category 5/6 LAN cable.
The BS421 contains the latest generation of DSP and processor technology.
It is designed for a fully IP based solution including support for Voice-over-IP.
The BS421 is provided with a special RF test loop functionality, which allows remote test of the RF parameters, including RX antenna return loss and RX sensitivity.
The IP connectivity allows remote diagnostic, test and software update. Windows desktop, file transfer, SNMP and the OM interface are remotely available.
The DAMM BS421 supports terminals from a wide range of suppliers and complies with the ETSI ETS 300 392 and the TETRA MoU TIP specifications.
Characteristics
| Parameter | Value |
| Frequency band, MHz | RX=300-310, TX=336-346, BW=10 RX=350-360, TX=360-370, BW=5 RX=380-390, TX=390-400, BW=5 RX=410-420, TX=420-430, BW=5 RX=450-460, TX=460-470, BW=5 |
| Synthesizer frequency step | 6.25kHz |
| Duplexer | Built in |
| Receiver Static sensitivity | -118dBm |
| Dynamic sensitivity with diversity (TU50 at 4% BER) | -118dBm |
| Diversity | Dual as standard |
| Storage | CF disk 128MB |
| Ethernet including voice over IP | 10/100Mbit |
| RF connectors (TX/RX-A, RX-B, RX-A-OUT, GPS) | N-female |
| Combined Power, LAN and sync connector | Sub D-25 male |
| Dimensions incl. mounting bracket (HxWxD) | 333x246x165mm |
| Weight | 9 kg |
| Operating temperature range | -25°C to +55°C (standard) -40°C to +55°C (special) |
| Encapsulation | IP65 |
