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TL 9000 is the first unified set of quality system requirements specifically for the telecommunications industry.
TL 9000 encompasses the ISO 9001 standard verbatim, plus additional industry-specific telecom requirements, and is applicable to telecom manufacturers and suppliers involved in design, development, production, delivery, installation and maintenance of telecommunications products and services.
This is only an overview/extract of the standard. Users should not rely on its accuracy, but should refer to the complete standard of the appropriate revision.