V.24
<standard> The ITU-T standard defining interchange circuits between DTE and DCE.
V.24 is the ITU-T equivalent of EIA standard EIA-232C, though V.24 only specifies the meaning of the signals, not the connector or the voltages used.
V.24 recommends 12 modem carrier frequencies that will not interfere with Dual Tone Multi-Frequency or other telephone control tones.
These are:
GROUP A
=
920 Hz, 1000 Hz, 1080 Hz, 1160 Hz GROUP B
=
1320 Hz, 1400 Hz, 1480 Hz, 1560 Hz Group C
=
1720 Hz, 1800 Hz, 1880 Hz, 1960 Hz
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