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ITU-T V.21 (11/1988)

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300 bits per second duplex modem standardized for use in the general switched telephone network
Citation: https://handle.itu.int/11.1002/1000/2731
Series title: V series: Data communication over the telephone network
  V.10-V.34: Interfaces and voiceband modems
Approval date: 1988-11-25
Approval process:WTSA
Status: In force
Maintenance responsibility: ITU-T Study Group 16
Further details: Patent statement(s)