CX81801-7X Просмотр технического описания (PDF) - Conexant Systems

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Компоненты Описание

производитель

CX81801-7X

SmartV.XX Modem

Conexant Systems 

1.4

1.4.1

1.4.2

1.4.3

1.4.3.1

1-6

CX81801-7x/8x SmartV.XX Modem Data Sheet

Technical Overview

General Description

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

handset interface, optional voice/speakerphone 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,

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 256 KB), or external serial

EEPROM (256 to 32 KB) and external RAM (up to 128 KB). To support country profile

addition or modification, external serial EEPROM (256 to 32 KB) 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.

Serial interface operation is selected by PARIF input low.

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,

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.

The modem firmware is provided in object code form for the OEM to program into

external ROM/flash ROM. The modem firmware may also be provided in source code

form under a source code addendum license agreement. External ROM/Flash ROM and

RAM must be installed in order to operate the modem with customized firmware.

Operating Modes

Data/Fax Modes

Data modem modes perform complete handshake and data rate negotiations. Using

modem modulations to optimize modem configuration for line conditions, the modem

can connect at the highest data rate that the channel can support from 56 kbps down to

2400 bps with automatic fallback.

In V.92/V.90 data modem modes (V.92 models), the modem can receive data from a

digital source using a V.92-compatible central site modem at line speeds up to 56 kbps.

With PCM upstream enabled (V.92 only), data transmission supports sending data at line

Conexant

102199B

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