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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
