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Telecommunications equipment - Private branch exchanges (PBXs) - Transmission requirements for analogue PBXs
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Obsolete Revision Information:
EDITION 3 - ENGLISH LANGUAGE EDITION - May 12, 1995
EDITION 2 - ENGLISH LANGUAGE EDITION - Dec. 4, 1991
EDITION 1 - ENGLISH LANGUAGE EDITION - Sept. 13, 1989