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MD211
Conexant
3
Features (Continued)
•
Fax modem send and receive rates up to 33.6 kbps
−
V.34 fax, V.17, V.29, V.27 ter, and V.21 channel 2
•
V.80 synchronous access mode supports host-based
communication protocols
•
World-class operation
−
Call progress
−
Blacklisting
−
Multiple country support
•
Voice/TAM/telephony extensions mode
•
Handset support (SP and SVD models)
•
Full-duplex speakerphone (FDSP) mode (SP and SVD
models)
−
Acoustic and line echo cancellation
−
Microphone gain and muting
−
Speaker volume control and muting
•
AudioSpan simultaneous audio/voice and data (SP and
SVD models)
−
ITU-T V.61 modulation (4.8 kbps data with audio)
−
Handset, headset, or microphone/speaker
•
ITU-T V.70 DSVD using the RCDSVD SCP (SVD models)
−
ITU-T interoperable G.729 and G.729 Annex A with
interoperable G.729 Annex B
−
Voice/silence detection and handset echo cancellation
−
Robust DSVD timing recovery
−
Handset, headset, or half-duplex speakerphone
•
Host-based DSVD support with V.70 software drivers for
Windows 95
•
Communication software compatible AT command sets
•
NVRAM directory and stored profiles
•
Flash memory support
•
Internal phase-locked loop (PLL)
•
Built-in host/DTE interface with speeds up to 230.4 kbps
−
Parallel 16550A UART-compatible interface
−
Serial ITU-T V.24 (EIA/TIA-232-E)
•
Supports Conexant PnP ISA Bus Interface Device
•
Supports Serial PnP interface per Plug and Play External
COM Device Specification, Rev 1.00
•
Flow control and speed buffering
•
Automatic format/speed sensing
•
Serial sync/async data; parallel async data
•
Caller ID and distinctive ring detect
•
Packages:
−
MCU: 80-pin PQFP
−
MDP: 100-Pin PQFP
−
PNP: 80-Pin PQFP
−
RCDSVD SCP: 100-pin PQFP
•
+5V operation
•
Sleep Mode
Description
General
The modem device set, consisting of separate
microcontroller (MCU), modem data pump (MDP), optional
Plug and Play (PnP) ISA Bus Interface Device, and
optional RCDSVD Speech Codec Processor (SCP)
devices, provides the processing core for a complete
modem design.
For data/fax/V.80/voice/TAM/speakerphone/host-
DSVD/AudioSpan operation, only the microcontroller
(MCU) and modem data pump (MDP) devices are
needed. The OEM adds an MCU crystal, discrete
components, and a telephone line/telephone/voice/TAM/-
telephony extension interface circuit to complete the
modem system. Optional on-board DSVD operation is
supported with addition of the RCDSVD Speech Codec
Processor (SCP) device to an SP model (included in SVD
models). Table 1 shows the supported functions by
product family.
Dialing, call progress, V.80, telephone line interface,
voice/TAM, speakerphone, AudioSpan, and DSVD
functions are supported and controlled through the AT
command set.
Connection to the host/DTE is supported by serial DTE
interface (Figure 1) or parallel host interface (Figure 2)
depending on installed modem firmware.
For U.S. operation, the modem can operate with a 1-relay
data/fax/TAM DAA interface (Figure 3) or a 2-relay
data/fax/TAM/Speakerphone DAA interface (Figure 4).
Data/Fax Modes
In V.90/K56flex data modem mode (RC56), the modem
can receive data from a digital source using a V.90- or
K56flex-compatible central site modem at line speeds up
to 56 kbps. Asymmetrical data transmission supports
sending data at speeds up to V.34 rates. This mode can
fallback to full-duplex V.34 mode.
In V.34 data modem mode, 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 33.6 kbps to 300
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 mode and can support Group 3
facsimile send and receive speeds of 33600, 31200,
28800, 26400, 24000, 21600, 19200, 16800, 14400,
12000, 9600, 7200, 4800, and 2400 bps. 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 at speeds up to 33.6
kbps with automatic rate adaption. Fax data transmission
and reception performed by the modem are controlled and
monitored through the EIA/TIA-578 Fax Class 1, T.31 Fax
Class 1.0, or Fax Class 2 command interface. Full HDLC
formatting, zero insertion/deletion, and CRC
generation/checking are provided.
Both transmit and receive fax data are buffered within the
modem. Data transfer to and from the DTE is flow
controlled by XON/XOFF and RTS/CTS.
