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� Home : ITU-T : Publications : Recommendations : V�Series : V.21
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V.21�:�300 bits per second duplex modem standardized for use in the general switched telephone network �

Recommendation V.21

In force components
Number
 Title Status
V.21 (11/88)
� 		300 bits per second duplex modem standardized for use in the general switched telephone network � In force

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