Frequency sharing allows adjacent BS422s to use the same frequencies. This is a significant benefit in low density networks and gives the possibility to cover for example a railway line with just two frequency pairs.
With frequency sharing an indoor repeater system can be built without optical fibres. The same hardware can be used as base station and repeater unit, increasing redundancy and simplifying the network architecture by having one unified network management system and reduced spare part stock.
With the BS422 network availability can be brought to a new level. Two BS422s located at two sites can act as one fully redundant base station, sharing the same frequencies. This will add redundancy not only to the base station, but also to the whole antenna system.
With its advanced voice and data features and high level of terminal interoperability, TETRA is often the preferred technology for radio communication across a wide range of industries. Having four channels on each frequency makes it the preferred choice for mid to high user density networks.
Using frequency sharing you can now make TETRA as frequency efficient as other technologies in low density networks. This means that you take advantage of all TETRA features without giving up on frequency efficiency, quality of coverage or network resilience.
Tunnel coverage can be tricky to achieve and typically involves installing expensive optical fibres, operating two separate management systems and stocking spare parts for multiple types of hardware. However, there is a smarter way using DAMM frequency sharing.
To cover a railway line, you typically need five frequency pairs even though you only have few users in the network. This means you are wasting expensive frequency licenses. However, with a DAMM solution, these can be cut down to two.
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