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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:
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X.25 German PTT Datex-P PSN
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X.25 via ARINC 429 / Williamsburg
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V.24 text-oriented VHF data link
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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.
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Typical Measurement Setup
Data Transmission Latency Time Distribution
Data Link Analyser Architecture
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