SemTETRA SemTETRA is based on the ETSI TETRA (TErrestrial Trunked Radio) standard and is an open digital trunked radio standard defined by the European Telecommunications Standardization Institute (ETSI). This standard meets the requirements of the most critical private mobile radio users such as the police, emergency services, the oil & gas sector, harbours, airports and the military. SemTETRA offers an advanced solution that integrates many other telecommunication systems with the SemTETRA system. SemTETRA enables direct calls between a TETRA terminal and telephone networks, other radio systems like ships radio systems, helicopter radios, and traditional VHF/UHF on-board radios, making it a unique and effective way of communicating. A brief technical introduction SemTETRA is a new TETRA radio system for single- and multi-node solutions. It is a full IP based system designed for IP based backbone networks and IP based interfaces like SIP voice gateways, PABX or IP based call manager. The system is based on the Single Carrier Base Station Transceiver Unit and Base Station Controller (BSC), and is optimised for 1- and 2-carrier solutions with two antennas (TX/RX). Two systems can be interconnected to provide a 3- or 4-carrier solution with redundant BSC and power supply, carriers and antennas. A subscriber register is present on each node allowing full verification of the subscribers and full access to feature lists. One BSC acts as master. All other BSCs are on standby as slaves. The base stations are designed to operate autonomously as a complete stand-alone system without any support from other external units. All nodes have equal priority, and no centralised nodes show any single point of failure. Any changes to the master subscriber register will be broadcasted immediately to the other slave subscriber registers and updated instantly. Authentication and air interface encryption The SemTETRA system fully supports Tetra security class 1 and 3 features, and is basically supporting the air interface encryption TEA1, TEA2 and TEA3 algorithms. Authentication is supplied as standard on all SemTETRA systems, whereas air interface encryption can be chosen as an option. SemTETRA numbering plan The SemTETRA system makes it possible to operate with a unique numbering plan. Each individual and group can be set up to have a unique number (dial number) with up to 7 digits. Voice gateway Voice gateways can be activated on any node by using the SIP protocol with voice-over IP. The gateway can handle up to 15 simultaneous speech connections. The voice gateway supports incoming and outgoing Duplex calls in a normal way.
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