Jaton Communicator V.90 - Manual (Page 11)

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It implements all data rates and modulation schemes for IT-U (formally
CCITT) standards V.34, V.32bis, V.32, V.22bis, V.22, V.21, Bell 212A,
and Bell 103. The INTEL / AMBIENT MD5662 implements a standard
data mode AT command set. This is compatible with any communication
application software that supports the Hayes

AT command set.
V.42/MNP
 
2-4 AND V.42 BIS/MNP
 
5 MODES
The modem supports error correction(V.42/MNP 2-4) and data compression
(V.42 bis/MNP 5). Error correction ensures error-free data transfer. Data
compression substantially increases the modem data throughput over the
basic data rate. Depending on the data stream, MNP 5 may provide up to 2-
to-1 compression. Alternately, CCITT V.42 bis may provide up to 4:1
compression.
FAX MODE
In the fax mode, the modem operate at up to 14,400 bps (transmit and
receive) and implement all the data rates and modulation schemes for
CCITT standards V.17, V.29, V.27ter, and V.21 channel 2. The
Cirrus/Ambient chipset implement a standard fax command set compatible
with any communication application software that supports EIA/TIA-578
Fax Class 1 standards.
VOICE/AUDIO MODE
In voice/audio mode, enhanced 2-bit or 4-bit per sample ADPCM coding
and decoding at 7200Hz sample rate allows efficient digital storage of
voice/audio. This mode supports digital telephone answering machine,
voice annotation, and audio recording and playback application.
TELEPHONE-EMULATION MODE
This mode allows a microphone-speaker and modem to be used as a
complete telephone. In Telephone emulation mode, the received data from
the microphone interface is looped back to the SAFE analog transmit pins.
In voice mode, the message record and playback abilities are accessed by the
extended AT command set.