RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide
1154
Conexant
1-1
1. INTRODUCTION
1.1 SUMMARY
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 1-1).
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 (see RCDSVD SCP Designer’s Guide, Order No. 1087), 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.
This designer's guide describes the modem system capabilities and hardware interfaces. Supporting AT commands and S
Registers are identified in firmware release notes and defined in the AT Command Reference Manual (Order No. 1131 or
1199 depending on installed firmware).
Summary of Contents for RC144D
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