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RS56

Host-Processed V.90/K56flex™ Modem Device Family for Mobile Applications

Conexant Systems 

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Description

General

The RS56-PCI Device Sets provide the processing core

for a complete system design featuring data/fax modem,

voice/TAM, and speakerphone depending on specific

model (Table 1).

Note: The term, “SoftK56”, refers to the family of modem

models listed in Table 1.

The modem is the full-featured, self-contained data

modem, fax modem, voice/TAM, and speakerphone

(optional) solution. These functions, as well as dialing, call

progress, telephone line interface and host interface

functions are supported and controlled through the

command set.

The modem hardware connects to the host PC via a PCI

bus interface. The OEM adds a crystal circuit, telephone

line interface, telephone interface (optional), and audio

interface (optional) to complete the system.

Host-Processed Modem Software

The host-processed modem software performs two

distinct tasks:

1. General modem control, which includes command

sets, fax Class 1, voice/TAM, speakerphone, error

correction, data compression, and operating system

interface functions.

2. Modem data pump signal processing, which includes

data and facsimile modulation and demodulation, as

well as voice sample formatting.

Configurations of the modem software are provided to

support modem models listed in Table 1.

Binary executable modem software is provided for the

OEM.

Data/Fax Modes

As a V.90/K56flex data modem, the modem can receive

data from a digital source using a V.90- or K56flex-

compatible central site modem over the digital telephone

network portion of the PSTN at line speeds up to 56 kbps.

Asymmetrical data transmission supports sending data up

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

mode, and to slower rates as dictated by line conditions.

As a V.34 data modem, 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 33600 bps down to 2400 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 fax modem mode, the modem can operate in 2-wire,

half-duplex, synchronous modes and can support Group 3

facsimile send and receive speeds of 14400, 12000,

9600, 7200, 4800, or 2400 bps. Fax data transmission



and reception performed by the modem are controlled and

monitored through the fax EIA/IA-578 Class 1 and T.31

Class 1.0 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-controlled

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

applications.

Voice-call-first (VCF) before switching to a videophone

call is also supported.

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 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 SP 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 SP 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 SP models, a speaker/handset.

Speakerphone Mode (SP Models)

The SP model includes an additional telephone handset,

external microphone, and external speaker interface

which supports voice and full-duplex speakerphone

(FDSP) operation. The 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 speakerphone mode provides hands-free full-duplex

telephone operation under host control. The host can

separately control volume, muting, and AGC in

microphone and speaker channels.

The speakerphone mode also supports Voice/TAM Mode

connection to a handset.

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