DS56-L490-001 Просмотр технического описания (PDF) - Conexant Systems

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DS56-L490-001

V.90/K56flex™ PC Card Device Sets for Host-Controlled, Low Power Applications

Conexant Systems 

HCFL/56

V.90/K56flex PC Card Device Sets for Host-Controlled, Low Power Applications

Operating Modes

Data/Fax Modes

In V.90/K56flex data modem mode, the modem can

receive data from a digital source using a V.90- or

K56flex-compatible central site modem at line

speeds up to 56 kbps. Asymmetrical data

transmission supports sending data at speeds up to

V.34 rates. This mode can fallback to full-duplex

V.34 mode, and to lower rates as dictated by the line

conditions.

In V.34 data modem mode, the modem can operate

in 2-wire, full-duplex, asynchronous modes at line

rates up to 33.6 kbps. Data modem modes perform

complete handshake and data rate negotiations.

Using V.34 modulation to optimize modem

configuration for line conditions, the modem can

connect at the highest data rate that the channel can

support from 33.6 kbps to 300 bps with automatic

fallback. Automode operation in V.34 is provided in

accordance with PN3320 and in V.32 bis in

accordance with PN2330. All tone and pattern

detection functions required by the applicable ITU or

Bell standard are supported.

In V.32 bis mode, the modem operates at line

speeds up to 14.4 kbps.

In fax modem mode, the modem can operate in 2-

wire, half-duplex, synchronous mode and can

support Group 3 facsimile send and receive speeds

of 14400, 12000, 9600, 7200, 4800, and 2400 bps.

Fax data transmission and reception performed by

the modem are controlled and monitored through the

EIA/TIA-578 Fax Class 1, T.31 Fax Class 1.0, or Fax

Class 2 command interface. Full HDLC formatting,

zero insertion/deletion, and CRC

generation/checking are provided.

Synchronous Access Mode (SAM) – Video

Conferencing

V.80 synchronous access mode between the

modem and the host/DTE is provided for host-based

communication protocols, e.g., H.324 video

conferencing applications. Voice-call-first (VCF)

before switching to a videophone call is also

supported.

World Class Operation

W-class functions support modem operation in

multiple countries. Additional modem functions are

provided in areas such as dialing, carrier transmit

level, calling tone, call progress tone detection,

answer tone detection, blacklisting, and relay control.

Country dependent programmable parameters are

included in the .INF file for customization by the

OEM.

Voice/TAM Mode

Voice/TAM Mode features include 8-bit µ-Law, A-

Law, and linear coding at 8000 Hz and 7200 Hz

sample rates. Tone detection/generation, call

discrimination, and concurrent DTMF detection are

also supported. ADPCM (4-bit IMA) coding is also

supported to meet Microsoft WHQL logo

requirements.

Voice/TAM Mode is supported by three submodes:

1. Online Voice Command Mode supports

connection to the telephone line or, for S models,

a handset.

2. Voice Receive Mode supports recording voice or

audio data input at the RIN pin, typically from the

telephone line or, for S models, a

microphone/handset.

3. Voice Transmit Mode supports playback of voice

or audio data to the TXA1/TXA2 output, typically

to the telephone line or, for S models, a

speaker/handset.

Speakerphone Mode (S Models)

The S models include additional telephone handset,

external microphone, and external speakerphone

interfaces which support voice and full-duplex

speakerphone (FDSP) operation.

Hands-free, full-duplex telephone operation is

supported in Speakerphone Mode under host

control. Speakerphone Mode features an advanced

proprietary speakerphone algorithm which supports

full-duplex voice conversation with acoustic, line, and

handset echo cancellation. Parameters are

constantly adjusted to maintain stability with

automatic fallback from full-duplex to pseudo-duplex

operation. The speakerphone algorithm allows

position independent placement of microphone and

speaker. The host can separately control volume,

muting, and AGC in microphone and speaker

channels.

Sleep Mode

Sleep Mode is supported in the modem device set.

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Conexant

Doc. No. 100586C

Proprietary Information

November 10, 1999

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