The following list provides examples of activities we have performed
Concept Definition for a Comparative Data Link Performance Test Campaign
This task encompassed development of the objectives, the concept, the detailed test approach and the tools for a test campaign in which different Data Link Media (AMSS, Mode S and VHF Modes 2 and 4) were benchmarked and evaluated in terms of their respective capabilities.
Concept Definition of ATN Data
Link Trials Infrastructure
In this task it was necessary to integrate existing implementations of the Aeronautical Mobile Satellite Service AMSS and of Mode S together with an entire ATN protocol stack in order to produce ATN integrated application layer services (e.g. CPDLC) for a controller pilot simulation facility.
The CIMS Data-Link/Processing Analyser (CDA) is a tool for analysing the data transfer or processing properties of communications and processing systems. Its open architecture supports interfaces to a wide range of systems. The currently supported interfaces include:
X.25 German PTT Datex-P PSN
X.25 via ARINC 429 / Williamsburg
V.24 text-oriented VHF data link
VDL Mode 2
In order to investigate the properties of a communications or processing system a CDA is connected at both the transmitting and receiving ends of the data-link. Since synchronisation is ensured by radio clocks (DCF 77 or GPS) it is not necessary that both ends be at the same location.
Script-files define test scenarios, so allowing a flexible definition and automatic tests over hours or even days. During the performance of a test run transmit- and receive events are recorded and stored in logfiles. Precise time-stamps permit all manner of subsequent evaluation.
The script- and log-files are structured ASCII files. Logfile post-processors are available for the evaluation of transmission latency, error rates, loss rates and throughput. Modules for customer specific post-processing may be readily integrated.
The CDA features a modular and open architecture consisting of an intuitive Graphical UserInterface (GUI), a test execution kernel and system-specific interface modules. The interface module executes as an independent task and communicates with the Text Execution Kernel by a procedural interface; the resultant decoupling ensures that any adaptation to a particular system is limited to the interface module.
The user interface is an X-client application and, if so required, may be operated from an X-Server elsewhere in the network.
The CIMS Data-link/Processing Analyser is currently available for PC-platforms under Sun Solaris and Linux. A port to Windows-NT is in preparation.