R6781-22 Ver la hoja de datos (PDF) - Conexant Systems
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R6781-22 Datasheet PDF : 104 Pages
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1.0 Functional Description
1.2.1 General
D224ATLVDSC
1.1 Overview
The Conexant RC224ATLV is a combination V.22 bis data and Group 3 fax
CMOS modem in a single VLSI package and is identical to the RC224ATLV. The
RC224ATLV integrated data/fax modem is available in either a 68-pin plastic
leaded chip carrier (PLCC) or a 100-pin plastic quad flat pack (PQFP).
Full error correction (V.42 LAPM, MNP2-4) and data compression (V.42 bis,
MNP 5) capabilities can be supported in the RC224ATLV using the host
communication software.
The modem has a selectable parallel or serial interface to the host data
terminal equipment (DTE). When parallel mode is selected, a 16C450-compatible
interface allows direct connection to a notebook, laptop, or PC-compatible bus
without an external universal asynchronous receive/transmit (UART). When
serial mode is selected, a CCITT V.24 logic-compatible interface with transistor to
transistor logic (TTL) levels is supplied along with indicator outputs.
1.2 Technical Specifications
The RC224ATLV modem is a full-featured, self-contained data/fax solution. No
external microcontroller for data or fax control functions is required. Dialing, call
progress, and telephone line interface functions are fully supported and controlled
through the AT command set.
Data modes perform complete handshake and data rate negotiations. All tone
and pattern detection required by the applicable CCITT or Bell standard are
supported.
Fax modes support Group 3 fax requirements. Fax data and fax control (V.21
300 bps), performed by the modem, are controlled and monitored through the fax
EIA-578 Class 1 command interface. Full HDLC formatting, flag
insertion/deletion, and CRC generation/checking is provided.
Both transmit and receive fax data is buffered within the modem. Fax data
transfer to and from the DTE is flow controlled by X-on/X-off.
Conexant
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