词条	Voiceband modem operating standards
释义	Voiceband modem operating standards Table Voiceband modem operating standards ITU-T standard transmission rate modulation method transmission mode V.27ter 4.8 kbps PSK half-duplex V.29 9.6 kbps QAM half-duplex V.17 14.4 kbps QAM/TCM half-duplex V.21 300 bps FSK full-duplex V.22 1.2 kbps PSK full-duplex V.22bis 2.4 kbps QAM full-duplex V.32 9.6 kbps QAM/TCM full-duplex V.32bis 14.4 kbps QAM/TCM full-duplex V.34 28.8 kbps QAM/TCM full-duplex V.90 56 kbps (downstream) PCM full-duplex 33.6 kbps (upstream) QAM/TCM full-duplex See as table:
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