Conexant RC1440D Technical Manual

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Integrated V.90/K56flex

/V.34/V.32bis Modem Device Sets

for Desktop Applications

The Conexant

 RC56D, RC336D, and RC144D Modem

Device Set families support data/fax,

voice/TAM/telephony extensions, V.80 synchronous

access mode, host-DSVD, and optional speakerphone,

AudioSpan, and on-board DSVD functions depending

upon model (Table 1).

The modem supports the following primary data

modulations: ITU-T V.90/K56flex

 (RC56), V.34 (RC56

and RC336) and V.32bis. Otherwise, the modems are

identical within like models, e.g., SP models operate the

same. Unless otherwise noted, descriptions in this

document apply to all modem families and models.

The modem is designed to operate with dial-up telephone

lines in the U.S. and world-wide.

Low profile, small PQFP packages make this device set

ideal for desktop applications using parallel host or serial

DTE interface.

The device set consists of an 8-bit microcontroller (MCU)

in an 80-pin PQFP, a modem data pump (MDP) in a 100-

pin PQFP, and an optional Plug and Play (PnP) ISA Bus

Interface Device in 80-pin PQFP. The SVD model is the

same as the SP model with the addition of an RCDSVD

Speech Codec Processor (SCP) in a 100-pin PQFP to

support DSVD.

Downloadable architecture supports downloading of

modem firmware from the host/DTE to the MCU and,

transparently to the host/DTE, the downloading of MDP

code modules from the MCU.

The modem operates by executing firmware from installed

1Mbit (128k x 8) RAM and 2Mbit (256k x 8) ROM/flash

ROM. The RC336 and RC144 can alternatively use 32k x

8 RAM and 1Mbit or 2Mbit ROM/flash ROM.

In V.90/K56flex mode (RC56), the modem can receive

data at speeds up to 56 kbps from a digitally connected

V.90- or K56flex-compatible central site modem. Taking

advantage of the PSTN which is primarily digital except

for the client modem to central office local loop,

V.90/K56flex modems are ideal for applications such as

remote access to an Internet Service Provider (ISP), on-

line service, or corporate site. The modem can send data

at speeds up to V.34 rates.

In V.34 data mode (RC56 and RC336), the modem

operates at line speeds up to 33.6 kbps. Error correction

(V.42/MNP 2-4) and data compression (V.42 bis/MNP 5)

maximize data transfer integrity and boost average data

throughput up to 230.4 kbps. Non-error-correcting mode is

also supported.

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

to 14.4 kbps.

The modem supports fax Group 3 send and receive rates

up to 33.6 kbps and T.30 protocol.

In voice/TAM mode, enhanced 2-bit or 4-bit per sample

ADPCM coding and decoding at 7200 Hz sample rate

allows efficient digital storage of voice/audio. This mode

supports applications such as digital telephone answering

machine (TAM), voice annotation, and recording from and

playback to the telephone line. Other voice/TAM functions

using handset or headset are supported by SP and SVD

models. Extension pickup /remote hangup detection and

line-in-use detection telephony extensions are also

supported.

SP and SVD models support position independent, full-

duplex speakerphone (FDSP) operation using microphone

and speaker, as well as other voice/TAM applications

using handset or headset.

SP and SVD models also support AudioSpan (analog

simultaneous audio/voice and data) operation with a data

rate of 4.8 kbps with audio.

SVD models, using the optional RCDSVD SCP device,

support hardware-based (on-board) V.70 DSVD (digital

simultaneous voice and data) with speech coding per ITU-

T interoperable G.729 and G.729 Annex A with

interoperable G.729 Annex B.

Host-based DSVD is supported in all models, however,

the host PC must supply full-duplex sound support,

typically to a microphone/speaker, such as provided by

Conexant WaveArtist devices or a sound card.

A common PC board design can support data/fax, V.80,

voice/TAM/telephony extensions, speakerphone,

AudioSpan, and host- or on-board DSVD operation

depending on the installed modem and optional PnP and

RCDSVD devices.

Accelerator kits and reference designs are available to

minimize application design time and costs. PC-based

“ConfigurACE™ II for Windows” software allows MCU

firmware to be customized.

Features

•

 Downloadable MCU firmware from the host/DTE and

downloadable MDP code modules from the MCU

•

 Data modem

−

  ITU-T V.90 and K56flex (RC56 models)

−

  V.34 (33.6 kbps) (RC56 and RC336 models)

−

  V.32 bis, V.32, V.22 bis, V.22, V.23, and V.21

−

  Bell 212A and 103

−

  V.42 LAPM, MNP 2-4, and MNP 10 error correction

−

  V.42 bis and MNP 5 data compression

−

  MNP 10EC™ enhanced cellular performance