Data Sheet

Order No. MD205

March 31, 1998

FM209 and FM214

9600/14400 bps MONOFAX

Modem Family

The ConexantTM FM209 and FM214 MONOFAX

modem family offers

synchronous 9600 or 14400 bits per second (bps) half-duplex modems with
error detection, voice and audio codecs, full-duplex speakerphone,
automatic speech recognition, DTMF reception, V.23 full-duplex, Type I
Caller ID and Type II Caller ID CAS detection. It has low power consumption
and is housed in a single 128-pin Thin Quad Flat Pack (TQFP) device
package. The modem's small size and low power consumption allow the
design of compact system enclosures for use in both office and home
environments. Table 1 lists the FM209/FM214 models and features.

Group 3 Facsimile Modem

The modem can operate over the public switched telephone network (PSTN)
through line termination provided by a data access arrangement (DAA).

The modem satisfies the requirements specified in ITU-T recommendations
V.33, V.17, V.29, V.27 ter, V.21 Channel 2 (FSK), T.4, and meets the binary
signaling requirements of T.30.

The modem operates at 14400, 12000, 9600, 7200, 4800, 2400, or 300 bps.
The modem supports the V.17 signaling rates of 14400, 12000, 9600, and
7200 bps using trellis-coded modulation (TCM). In addition, the modem
supports V.27 ter and V.17 short trains.

The modem can also perform HDLC framing according to T.30 at 14400,
12000, 9600, 7200, 4800, 2400, or 300 bps.

A FSK flag pattern (7E) detector facilitates FSK detection during V.33, V.17,
V.29, and V.27 ter reception.

The modem includes a programmable single/dual tone transmitter, a
programmable DTMF receiver, three programmable tone detectors (which
operate concurrently with the V.21 Channel 2 receiver), and a ring detector.
The transmit output level is also programmable.

Voice and Audio Codecs (-V Option)

The voice coder/decoder (codec) compresses voice at an average rate of
2.9 kbps or at a fixed rate of 4.7 kbps with near toll quality playback at
various pitch synchronized playback speeds. An average rate of 2.9 kbps
provides 24 minutes of stored voice messages in 4 Mbits of memory. This
voice codec allows the host controller to efficiently store and playback digital
incoming messages (ICMs) and outgoing messages (OGMs).

The ADPCM audio codec compresses audio signals (music/voice) at 32
kbps or 24 kbps for highest fidelity coding and reproduction.

The PCM audio codec allows the host controller to transmit and receive
uncompressed audio signals.

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Information provided by Conexant Systems, Inc. is believed to be accurate and reliable. However, no responsibility is assumed by Conexant
for its use, nor any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or
otherwise under any patent rights of Conexant other than for circuitry embodied in Conexant products. Conexant reserves the right to change
circuitry at any time without notice. This document is subject to change without notice.

Conexant and "What's Next in Communications Technologies" are trademarks of Conexant Systems, Inc.

Product names or services listed in this publication are for identification purposes only, and may be trademarks or registered trademarks of
their respective companies. All other marks mentioned herein are the property of their respective holders.

MD205

Selectable error correction coding allows storage in
audio grade RAMs (ARAMs). Echo cancellation
techniques employed during playback allow DTMF,
Type II Caller ID CAS detection, and tone detection
during voice/audio codec operation to support user
selectable features. Dual or single tone transmission is
supported. The coder can record messages from
either the primary or secondary IA.

Speakerphone (-S Option)

The full-duplex speakerphone provides hands-free
telephone conversation employing acoustic and line
echo cancellation and supports intercom conversation
employing dual acoustic echo cancellation.

The optional half-duplex speakerphone provides hand-
free telephone/intercom conversation with exceptional
high gain.

The speakerphone algorithm constantly adjusts its
parameters to deliver the best performance during
real-time conditions, allowing automatic fallback from
full-duplex to pseudo-duplex. The host controller can
easily set up the speaker mute, microphone mute,
automatic gain control (AGC) enable/disable,
microphone level, line level, speaker volume, tone
transmit, and handset functions.

Conversation recording and message playback are
supported during the speakerphone operation. DTMF
detection, Type II Caller ID CAS detection, and three
tone detectors are also supported.

Automatic Speech Recognition (-R Option)

Automatic Speech Recognition (ASR) consists of
Speaker Independent (SI) North American English
isolated word recognition for a predefined 69 word
vocabulary list, Speaker Dependent (SD) isolated word
training, and SD isolated word recognition functions.

V.23 Full-Duplex Modem and Caller ID

Both full-duplex transmit and receive (with asymmetric
1200/75 bps connection) and half-duplex (1200 bps)
asynchronous V.23 are supported, as well as both
serial and parallel interfaces to the modem. The V.23
algorithm includes an optional, programmable, receive
compromise equalizer which is active in both V.23 and
Caller ID modes.

Common applications for V.23 include France's Minitel
and Japan's Lowest Cost Routing.

General Purpose Output (GPO) and General Purpose
Input (GPI) pins are available for host assignment.

Additional design information is described in the
FM209 and FM214 MONOFAX Modem Family
Designer's Guide (Order Number 1175).

Table 1. FM209/FM214 Models and Features

Supported Features

Modem Model

Maximum

Line Speed

Voice and Audio

Codecs (-V)

Full Duplex

Speakerphone

(-S)

Automatic Speech

Recognition

(-R)

FM214-VSR

14.4 kbps

FM214-VS

14.4 kbps

FM214-V

14.4 kbps

FM214

14.4 kbps

FM209-VSR

9.6 kbps

FM209-VS

9.6 kbps

FM209-V

9.6 kbps

FM209

9.6 kbps

MD205

Technical Specifications

Configurations, Symbol Rates and Data Rates

The selectable modem configurations, along with the
corresponding symbol (baud) rates and data rates, are
listed in Table 2.

Scrambler/Descrambler

The modem incorporates a self-synchronizing
scrambler/descrambler in accordance with ITU-T V.33,
V.17, V.29, and V.27 ter recommendations, depending
upon the selected configuration.

Data Encoding

The data encoding conforms to ITU-T
recommendations V.33, V.17, V.29, V.27 ter, V.21
Channel 2, and V.23.

Fixed Digital Cable Compromise Equalizer

Compromise equalization can improve performance
when operating over low quality lines. The modem has
a selectable fixed digital compromise cable equalizer
in the high speed receive and transmit data path.

Transmitted Data Spectrum

The transmitted data spectrum is shaped in the
baseband by an excess bandwidth finite impulse
response (FIR) filter with the following characteristics:

When operating at 2400 baud, the transmitted
spectrum is shaped by a square root of 20% raised
cosine filter.

When operating at 1600 baud, the transmitted
spectrum is shaped by a square root of 50% raised
cosine filter.

When operating at 1200 baud, the transmitted
spectrum is shaped by a square root of 90% raised
cosine filter.

The out-of-band transmitter energy levels in the 4 - 50
kHz frequency range are below -55.0 dBm.

Transmit Level

The transmitter output level is programmable in the
DSP RAM from 0 dBm to -15.0 dBm and is accurate to

1.0 dB. The modem adjusts the output level by

digitally scaling the output to the transmitter's digital-
to-analog converter.

Turn-on Sequence

Transmitter turn-on sequence times are shown in
Table 3.

Receive Dynamic Range

The receiver satisfies PSTN performance
requirements for received line signal levels from 0
dBm to -43 dBm measured at the Receiver Analog
Input (RXA) input. An external input buffer must be
supplied between RXA and LINEIN.

The default values of the programmable Received
Line Signal Detector (RLSD#) turn-on and turn-off
threshold levels are -43 dBm and -48 dBm,
respectively. The RLSD# threshold levels can be
programmed over the following range:

Turn on: -10 dBm to -47 dBm
Turn off: -10 dBm to -52 dBm

Automatic Adaptive Equalizer

An adaptive equalizer in ITU-T V.33, V.17, V.29 and
V.27ter modes compensates for transmission line
amplitude and group delay distortion.

Receiver Timing

The timing recovery circuit can track a

0.01%

frequency error in the associated transmit timing
source.

Carrier Recovery

The carrier recovery circuit can track a

7 Hz

frequency offset in the received carrier.

Turn-off Sequence

Transmitter turn-off sequence times are shown in
Table 4.

Clamping

Received Data (RXD) is clamped to a constant mark
whenever RLSD# is off.

V.23 Full-Duplex Features

The modem can transmit and detect Break signals
(continuous Space).

The Mark and Space frequencies are 1300 and 2100
Hz, respectively, for 1200 bps, and 390 and 450 Hz,
respectively, for 75 bps.

Additional features include an optional host
programmable Receive Compromise Equalizer for
V.23 1200 bps reception and Caller ID mode.

Default transmitter turn-on/turn-off sequence times are
10.5 ms (RTS On to CTS On) and 2.2 ms (RTS Off to
CTS Off).

MD205

Table 2. Configurations, Signaling Rates, and Data Rates

Configuration

Modulation

Carrier

Frequency (Hz)

±0.01%

Data Rate (bps)

±0.01%

Baud

(Symbols/Sec.)

Bits

/Symbol

Constellation

Points

V.17/V.33 14400

TCM

1700 or 1800

14400

2400

128

V.17/V.33 12000

TCM

1700 or 1800

12000

2400

V.17 9600

TCM

1700 or 1800

9600

2400

V.17 7200

TCM

1700 or 1800

7200

2400

V.29 9600

QAM

1700

9600

2400

V.29 7200

QAM

1700

7200

2400

V.29 4800

QAM

1700

4800

2400

V.27 ter 4800

DPSK

1800

4800

1600

V.27 ter 2400

DPSK

1800

2400

1200

V.21 Channel 2 300

FSK

1650, 1850

300

V.23 receive HDX

FSK

1300, 2100

1200

V.23 1200/75

FSK

1300, 2100/

390, 450

1200/75

1200

Type I Caller ID

FSK

1200, 2200

1200

Notes:

1. Modulation legend:

QAM:

Quadrature Amplitude Modulation

DPSK:

Differential Phase Shift Keying

FSK:

Frequency Shift Keying

TCM:

Trellis-Coded Modulation

FM214 models only.

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: FM209

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: FM209