Code : WIL8140

Download the data sheet

Ensuring safe and reliable communication when you need it most!

Enables protocol analysis with message sequence charts (MSC) that display in detail the complex flow of communication in the signalling protocol between TETRA radio and base station.

Optionally provides Quality of Service analyser to chart issues within a radio cell over a given time period, including statistical evaluation.

Includes voice decoder, allowing users to monitor and record the ongoing voice communication in the network.

Measures channel and modulation parameters with the TETRA physical data analyser

Supports GPS-assisted radio coverage measurements

Features TETRA scanner to survey spectrum utilisation

Optionally decodes communication under static or dynamic air interface encryption

TETRA-based mobile networks form a basis for successful operation in the police and emergency services, airports, railways and for many other professional users. These user groups demand reliable and safe network operation at best possible radio coverage.

These high requirements can be fulfilled with Willtek’s 8140 TETRA AirAnalyzer, a unique and versatile tool to continuously analyse and maintain a TETRA network. It is also suited to examine issues during the introduction of new system technology and to perform interoperability tests in system development.

Two powerful and highly sensitive measurement receivers form the heart of the 8140 TETRA AirAnalyzer. These receivers pick up the bidirectional communication between TETRA mobile stations and a base station. All time slots in the downlink and uplink of a selectable channel are analysed simultaneously.

The TETRA AirAnalyzer decodes the data received on the radio channel in real time and forwards them to a PC for further processing. Various PC applications can analyse the data under different aspects. The analysis can be performed either online or offline, using the data received and stored at a later date.

Suspect faults in the message flow?

The TetraMSC application visualises the signalling messages received over the air interface in a clear and concise way. Thanks to the structured layout, users can easily identify which message is transmitted on what protocol layer. The messages are individually tagged with a time stamp and the relevant RF parameters, such as frame number, frequency offset and signal strength. Signalling messages not conforming to TETRA standard EN 300 392 are marked with a different colour. With a click on the marked message, the application displays a detailed error description.

A number of filter functions eases fault tracing because the user can reduce the messages displayed to those which are of interest in the case at hand.

Analysing voice communication and voice quality

The 8140 TETRA AirAnalyzer and its associated PC software can output and store voice data received over the air interface, enabling users to evaluate the voice quality and to observe communications over the network. With the voice decoder function, users can monitor speech on two time slots and record it in Wavesound format for later analysis. The direction and time slot can be selected on a straightforward user interface.

Observing the RF

The TETRA Physical Data Analyzer application complements the 8140 TETRA AirAnalyzer to give a powerful modulation analyser. Received data are stored with all details so that spectrum, received signal strength and modulation quality can be assessed at a later time. The analyser software visualises these physical layer measurements in a graphic display (see examples in Fig 4). Useful functions like the display of individual bursts, the rotation of the graph in the constellation display and I/Q modulation fulfil many desires of those analysing the physical layer in more detail.

Finding TETRA carrier problems

The TETRA Scanner searches for TETRA carriers in a user-defined frequency range. In addition to the available TETRA channels, the broadcast parameters are displayed for each carrier with a Main Control Channel. This feature helps to easily identify network configuration problems. The channels available can be monitored because the usage of time slots for traffic (TCH) is displayed and permanently updated. Associated measurement values such as received signal strength or frequency error, are shown in a diagram. This tool offers an easy way to check the results of network planning in real life, so that the network can be optimised if necessary. The current network status in regard to quality and quantity can be evaluated, so the tool can be used to find the best possible utilisation of resources. With a GPS mouse connected to the computer, the 8140 TETRA AirAnalyzer can even be turned into a full featured drive test receiver with real-time storage of the current position.