Digital local, transit, combined and international exchanges in integrated digital networks and mixed analogue-digital networks ; Supplements : recommendations Q.500-Q.554
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Digital local, transit, combined and international exchanges in integrated digital networks and mixed analogue-digital networks ; Supplements : recommendations Q.500-Q.554
(Blue book : CCITT, IXth Plenary Assembly, Melbourne, 14-25 November 1988, vol. 6 ; fasc. 6-5)
International Telecommunication Union, 1989
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