13
MINIMODEM USB
Fax Modulation
—V.21 CH2 FSK at 300 bps (half
duplex); V.27ter DPSK at 4800 and 2400 bps; V.29
QAM at 9600 and 7200 bps; V.17TCM at 14,400,
12,000, 9600, and 7200 bps
Carrier Frequencies
—
ITU-T V.34: 1600, 1646, 1680, 1800, 1829, 1867,
1920, 1959, 2000 Hz
AT&T V.32 terbo/ITU-T V.32 bis/V.32: 1800 Hz
V.22bis/V.22 or Bell 212A Standard (2400 and
1200 bps): Transmit originate: 1200 Hz; Transmit
answer: 2400 Hz; Receive originate: 2400 Hz;
Receive answer: 1200 Hz
ITU-T V.23 (1200 bps): Transmit originate: 390 Hz
mark, 450 Hz space; Receive originate: 1300 Hz
mark, 2100 Hz space; Transmit answer: 1300 Hz
mark, 2100 Hz space; Receive answer: 390 Hz
mark, 450 Hz space
ITU-T V.21 (0–300 bps): Transmit originate: 980 Hz
mark, 1180 Hz space; Receive originate: 1650 Hz
mark, 1850 Hz space; Transmit answer: 1650 Hz
mark, 1850 Hz space; Receive answer: 980 Hz
mark, 1180 Hz space