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ITU-T Q.421

1988 Edition, November 1, 1988

Complete Document

Line Signalling, Digital Version - Digital Line Signalling Code - Specifications of Signalling Systems R1 and R2 (Study Group XI) 2 pp



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Superseded By: ITU-T Q.400-Q.490

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W/D S/S BY ITU-T Q.400-Q.490
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