X.40�:�Standardization of frequency-shift modulated transmission systems for the provision of telegraph and data channels by frequency division of a group

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X.40�:�Standardization of frequency-shift modulated transmission systems for the provision of telegraph and data channels by frequency division of a group �

Recommendation X.40 (11/88)

Approved in 1988-11-25

Status : Withdrawn

No Document currently available

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