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TÜV Rheinland Group offers a wide range of digital interface test services for voluntary and regulatory markets. Together with our laboratories in Germany and America, TÜV Rheinland offers customer testing and approval services that meet a variety of standards, requirements and regulations. Our telecommunication experts are able to perform Layer 1 to Layer 3 ISDN testing for Basic Rate Interface and Primary Rate Interface in Europe, United States, Australia and Japan. Each of our accredited laboratories makes use of state-of-the-art test equipment in its operations to optimize time and cost efficiency.