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B11 V.32 at 7200bps
B12 V.32 (Non-TCM) at 9600bps
B13 V.32 at 9600bps
B14 V.32bis at 12000bps
B15 V.32bis at 14400bps
B16 V.34 at 14,400bps
B17 V.34 at 16,800 bps
B18 V.34 at 19,200 bps
B19 V.34 at 21,600 bps
B20 V.34 at 24,000 bps
B21 V.34 at 26,400 bps
B22 V.34 at 28,800 bps
B23 31,200 bps
B24 33,600 bps
B25 (Reserved)
B26 (Reserved)
B27 V.34 at 2400bps
B28 V.34 at 4800bps
B29 V.34 at 7200bps
B30 V.34 at 9600bps
B31 V.34 at 12,000bps
B40 K56flex at 32,000bps
B41 K56flex at 34,000bps
B42 K56flex at 36,000bps
B33 K56flex at 38,000bps
B34 K56flex at 40,000bps
B35 K56flex at 42,000bps
B36 K56flex at 44,000bps
B37 K56flex at 46,000bps
B48 K56flex at 48,000bps
B49 K56flex at 50,000bps
B50 K56flex at 52,000bps
B51 K56flex at 54,000bps
B52 K56flex at 56,000bps
Appending ! to the B command locks the modem to the specified speed e.g. ATB19! forces the
modem to operate only at V.34 21,600bps