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CX20463LSD

SmartSCM Modem

Conexant Systems 

SmartSCM Modem Data Sheet

1.2.2 SmartDAA Features

• System side powered DAA operates under poor line current supply conditions

• Wake-on-ring

• Ring detection

• Line polarity reversal detection

• Line current loss detection

• Pulse dialing

• Line-in-use detection – detects even while on-hook

• Remote hang-up detect – for efficient call termination

• Extension pickup detect

• Call waiting detection

• Digital PBX line protection

• Meets worldwide DC VI Masks requirements

1.2.3 Applications

• Handheld computers

• Gaming devices

• Point of sales terminals

• Remote monitoring and data collection systems

1.3 Technical Overview

1.3.1 General Description

Modem operation, including dialing, call progress, telephone line interface, telephone handset interface, optional

voice/speakerphone interface, optional analog cellular phone interface, GSM interface, and host interface functions are

supported and controlled through the V.250, V.251, and V.253-compatible command set.

The modem hardware connects to the host via a parallel or serial interface as selected by the PARIF input. The OEM adds a

crystal circuit, DIB components, telephone line interface, telephone handset/telephony extension interface,

voice/speakerphone interface, cellular interface, GSM interface, optional external serial EEPROM, optional external

ROM/flash ROM, optional external RAM, and other supporting discrete components as supported by the modem model

(Table 1-1) and required by the application to complete the system.

Customized modem firmware can be supported by the use of external memory in various combinations, e.g., either external

ROM/flash ROM (up to 256k bytes), or external serial EEPROM (256 to 32k bytes) and external RAM (up to 128k bytes). To

support country profile addition or modification, external serial EEPROM (256 to 32k bytes) can be installed. Customized code

can include OEM-defined commands, i.e., identification codes (I3), identifier string (I4), manufacturer identification (+GMI),

model identification (+GMM), and revision identification (+GMR), as well as code modification.

Parallel interface operation is selected by PARIF input high. Telephone line, cellular (AMPS) phone, or GSM phone interface

operation is selected by the LINE/CELL and LINE/GSM inputs. Installation of cellular phone driver is also required for cellular

phone interface operation. Installation of GSM firmware is also required for GSM phone interface operation.

Serial interface operation is selected by PARIF input low. Telephone line or cellular (AMPS) phone interface operation is

selected by the LINE/CELL input. Installation of cellular phone driver is also required for cellular phone interface operation.

1.3.2 MCU Firmware

MCU firmware performs processing of general modem control, command sets, data modem, error correction and data

compression (ECC), fax class 1, fax class 1.0, fax class 2, voice/audio/TAM/speakerphone, worldwide, V.80, and serial

DTE/parallel host interface functions according to modem models (Table 1-1).

MCU firmware can be customized to include OEM-defined commands, i.e., identification codes (I3), identifier string (I4),

manufacturer identification (+GMI), model identification (+GMM), and revision identification (+GMR), as well as code

modification.

100490C

Conexant

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