DAMM BS422 TETRA and DMR MultiTech Base Station
Achieving proper coverage along a railway track can be costly. To solve this, DAMM has enhanced the frequency sharing efficiency in both TETRA and DMR in its MultiTech Base Station BS422. This means that even TETRA becomes an option in low-density networks.
Frequency sharing is suitable for a linear railway track for example. Typically, it requires five frequency pairs to cover a railway line even though there are only a few users in the network. This means a lot of expensive frequency licences are wasted.
In this set-up, the same frequencies can be reused in every fifth base station as a signal degrades over distance and there needs to be a certain distance before the same frequency can be reused.
Using the DAMM frequency sharing function, the distance before a frequency can be reused is still the same. However, by sharing the same frequency pairs on four adjacent sites, a large radio cell will be created enabling reuse of the same frequency again after only one such large radio cell. As a result a railway line can be covered by using just two frequency pairs without causing interference.
This design ensures plenty of coverage overlap, resulting in high availability and geo-redundancy in a simple and cost-efficient network.
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