RC224ATL/224ATLV
1.0 Functional Description
EmbeddedModem Family
1.2 Technical Specifications
1.2.3 Operation
Modem operation is controlled by AT commands, fax service class 1 commands,
and supporting S registers.
1.2.3.1 Data Modes
Data rate selection is determined by the speed of the originating and answering
modems, as defined in Table 1-2.
Table 1-2. Data Rates vs. Connection Modem Rate
Connect Speed Based on Answer Modem Rate (bps)
Originate Modem Rate
(bps)
300
1200
2400
300
1200
2400
300
300
300
300
1200
1200
300
1200
2400
1.2.3.2 Fax Modes
Fax modes are negotiated as defined in T.30 and are implemented by AT+F
commands. The AT+FCLASS=1 command causes entry into the fax mode from
the data mode. Most other fax class 1 commands, which start with the AT+F
prefix, are valid only in the fax mode. All data commands are valid in the fax
mode except A/, On, &Tn, and the escape sequence (+++). The AT+FCLASS=0
command terminates the fax mode and causes entry into the data mode.
1.2.4 Data/Fax Auto Answering
The modem can automatically determine if the incoming call is from a data or fax
modem, make the appropriate connection, and inform the DTE of the connection
type.
1.2.5 Data Modulation
The data modulation conforms to V.29, V.27 ter, V.22 bis, V.22, V.21, Bell 212A,
or Bell 103, depending on the selected configuration. Transmitter and receiver
spectrum shaping is provided in accordance with the applicable standard.
1.2.6 Equalization
Automatic adaptive equalization and fixed compromised equalization are
provided to compensate for line distortions and to minimize the effects of
intersymbol interference.
1.2.7 Scrambler/Descrambler
The modem incorporates a self-synchronizing scrambler/descrambler, which
satisfies the applicable CCITT or Bell requirements.
D224ATLVDSC
Conexant
1-3
CONEXANT [ CONEXANT SYSTEMS, INC ]
