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L2531

Embedded Modem Family

Conexant Systems 

RC224ATL/224ATLV

EmbeddedModem Family

1.0 Functional Description

1.2 Technical Specifications

1.2.3 Operation

1.2.3.1 Data Modes

Modem operation is controlled by AT commands, fax service class 1 commands,

and supporting S registers.

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

Originate Modem Rate

(bps)

Connect Speed Based on Answer 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

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