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� Home : ITU-T : Publications : Recommendations : Q�Series : Q.400SerSup1 : Q.400SerSup1 (11/88)
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Q.400SerSup1�:�Line signalling for Dc lines with System R2 interregister signalling �

Recommendation Q.400SerSup1 (11/88)

Approved in 1988-11-25

Status : Superseded

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