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RH56D-PCI

Host Controlled V.90/K56flex™ Modem Device Family for Desktop Applications

Conexant Systems 

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Description

General

The RH56D-PCI modem provides the processing core for

a complete system design featuring data/fax modem,

voice/TAM, and speakerphone support, depending on

specific model (Table 1).

Note: The term, “RH56D-PCI Device Set”, refers to the

family of modem models listed in Table 1.

Modem operation, including dialing, call progress,

telephone line interface, telephone handset interface,

audio interface, and host interface functions are supported

and controlled through the command set.

The modem hardware connects to the host processor via

a PCI Bus interface. The OEM adds a crystal circuit,

EEPROM, telephone line interface, telephone handset

interface (optional), and audio interface (optional) to

complete the system.

Host Modem Software

The host 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 control. Binary executable code

controlling MDP operation is downloaded as required

during operation.

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 lower 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 (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 the SP model, a handset.

2. Voice Receive Mode supports recording voice or

audio data input at the RIN pin, typically from the

telephone line or, for the SP model, 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 the SP model, a

speaker/handset.

Speakerphone Mode (SP Model)

The SP model includes additional telephone handset,

external microphone, and external speaker 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.



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