BS 6450-7:1990

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Private branch exchanges for connection to public switched telephone networks run by certain public telecommunication operators. Specification for the procedure for in-service observation of PBXs undergoing type approval | Status: Withdrawn

Details

Publisher BS

File size 501.78 KB

Pages 14

Format PDF

Publication date 1990-10-28

ISBN-13 978-0-580-18751-3

ISBN-13 plain 9780580187513

ISBN-10 0580187519

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File size 501.78 KB

Pages 14

Format PDF

Publication date 1990-10-28

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