CONEX CX06832-16, CX06832-15, CX06832-14, CX06832-13, CX06832-12 Datasheet

Data Sheet

Conexant

Doc. No. 101361A

Proprietary Information December 1, 2000

FM336Plus

V.34/Group 3 High Performance Fax Modem Family

The Conexant™ FM336Plus High Performance Fax Modem family offers
ITU-T V.34 half-duplex mode operation that supports synchronous Group 3
facsimile send and receive speeds up to 33600 bits per second (bps).
The FM336Plus-D and FM336Plus-D90 support ITU-T V.34 duplex data
and synchronous/asynchronous modes with rates up to 33600 bps. The
FM336Plus-D90 also supports ITU-T V.90 PCM mode, which can receive
data at speeds up to 56 kbps.

The device has low voltage operation and is housed in a 100-pin Plastic Quad
Flat Package (PQFP). The modem’s small size and low power consumption
allow the design of compact system enclosures for use in industrial, office, and
home environments. Table 1 lists the FM336Plus Modem Family models and
features.

Utilizing V.34 and V.90 techniques to optimize modem configuration for line
conditions, the modem connects at the optimal selected data rate that the
channel can support from 2400 bps up to 56000 bps. The modem can operate
over the Public Switched Telephone Network (PSTN) through a line terminator
provided by a Data Access Arrangement (DAA).

The FM336Plus is backward pin compatible with the previous Conexant FM336
fax modem, and supports all features of the FM336 family. The FM336Plus also
has numerous feature and performance enhancements. For more information
on the enhancements, refer to the FM336Plus High Performance Fax Modem
Designer’s Guide (document 101360).

Table 1. FM336Plus Modem Family Models and Features

Clock InputModem Model Part

Number

V.34

Fax

Data

Mode

(–D)

V.90 PCM

Mode
(-D90)

Oscillator
Clock

Crystal
Clock

FM336Plus CX06832-11 Yes No No Yes No
FM336Plus CX06832-12 Yes No No No Yes
FM336Plus-D CX06832-13 Yes Yes No Yes No
FM336Plus-D CX06832-14 Yes Yes No No Yes
FM336Plus-D90 CX06832-15 Yes Yes Yes Yes No
FM336Plus-D90 CX06832-16 Yes Yes Yes No Yes

Features
(Entire FM336Plus Family)

• 2-wire half-duplex fax modem modes
with send and receive data rates up to
33600 bps

− V.34 half-duplex, V.17, V.33, V.29,

V.27 ter, and V.21 channel 2

− Short train option in V.17 and

V.27 ter

• 2-wire duplex data modem modes

− V.21, V.23 (75 bps TX/1200 bps RX

or 1200 bps TX/75 bps RX)

• PSTN session starting

− V.8 and V.8bis signaling

• HDLC support at all speeds

− Flag generation, 0-bit stuffing, ITU

CRC-16 or CRC-32 calculati on and
generation

− Flag detection, 0 bit deletion, ITU

CRC-16 or CRC-32 check sum
error detection

− FSK flag pattern detection during

high-speed receiving

• Tone modes and features

− Programmable single or dual tone

generation

− DTMF receiver

− Tone detection with three

programmable tone detectors

• Serial synchronous data

• Parallel synchronous data

• Automatic Rate Adaptation (ARA) in

V.34 half-duplex

• Auto-dial and auto-answer control

• TTL and CMOS compatible DTE

interface

− ITU-T V.24 (EIA/TIA-232-E)

(data/control)

− Microprocessor bus

(data/configuration/control)

• Receive dynamic range:

− 0 dBm to –43 dBm for V.17, V.33,

V.29, V.27 ter and V.21

− –9 dBm to –43 dBm for V.34 half-

duplex

• Quick Start for V.34 half-duplex
(Conexant Proprietary)

• Caller ID Demodulation

• Call Waiting Detector

• ADPCM Voice Mode

FM336Plus V.34/Group 3 High Performance Fax Modem Family

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Features
(Entire FM336Plus Family

−−−−

Continued)

• Programmable RLSD turn-on and turn-off thresholds

• Programmable transmit level: 0 to –15 dBm

• Adjustable speaker output to monitor received signal

• DMA support for interrupt lines

• Two 16-byte FIFO data buffers for burst data transfer with extension

up to 255 bytes

• Diagnostic capability

• V.21 Channel 1 Flag detect

• V.21 Channel 2 Flag detect

• +3.3 V operation with +5 V tolerant inputs

• +5 V analog signal interface

• 100-pin PQFP package

• Typical power consumption

− Sleep mode: 20 mW

− Normal mode: 250 mW

Distinguishing Features (-D / -D90)

• 2-wire duplex data modem modes with send and receive rates up to
33600 bps

− V.34 (33.6 kbps), V.32 bis, V.32, V.22 bis, and V.22

− Bell 212A and 103

• Serial asynchronous data

• Parallel asynchronous data

• In-band secondary channel (V.34 and V.32 bis)

• Automatic Rate Adaptation (ARA) in V.34 duplex and V.32 bis

• Automatic Mode Selection (AMS)

• Digital near-end and far-end echo cancellation

• Bulk delay for satellite transmission

• Receive dynamic range:

− –9 dBm to –43 dBm for V.34, V.32 bis, V.32, V.22 bis, V.22, and V.23

• 511 pattern generation/detection

• V.13 signaling

• Diagnostic capability

− V.54 inter-DCE signaling

− V.54 local analog and remote digital loopback

Distinguishing Features
(-D90 only)

• 2-wire duplex data modem modes
with receive data rates up to 56 kbps
and send data rates as specified in
the V.34 specification

− V.90 PCM mode

Copyright © 2000, Conexant Systems, Inc., All Rights Reserved.
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V.34/Group 3 High Performance Fax Modem Family FM336Plus

101361A

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GROUP3 FACSIMILE MODEM
(ENTIRE FM336PLUS FAMILY)

The modem satisfies the requirements specified in
ITU-T recommendations V.34 half-duplex, V.17, V.33,
V.29, V.27 ter, V.21, and meets the binary signaling
requirements of V.8 and T.30 with Annex F.

Internal HDLC support eliminates the need for an
external serial input/output (SIO) device in the DTE for
products incorporating error detection and T.30
protocol. The modem can perform HDLC framing per
T.30 at all data speeds. CRC generation/checking
along with zero insertion/deletion enhances
SDLC/HDLC frame operations. Two FSK (V.21 Ch. 1
and V.21 Ch. 2) flag pattern detectors facilitate FSK
detection during high-speed reception. The modem
features a programmable DTMF transmitter/receiver
and three programmable tone detectors.

DUPLEX DATA MODE (-D / -D90)

The duplex data mode supports Internet facsimile
applications. The modem can connect at the highest
data rate up to 33600 bps with auto fall back to
V.32 bis. The FM336Plus-D and FM336Plus-D90
modems satisfy the requirements specified in ITU-T
recommendations V.34, V.32 bis, V.32, V.22 bis, V.22,
V.23, V.21, Bell 212A, and Bell 103.

ITU-T V.90 PCM MODE (-D90)

The ITU-T V.90 PCM mode can receive data at
speeds up to 56 kbps from a digitally connected V.90
central site modem. The FM336Plus-D90 takes
advantage of the PSTN which is primarily digital to the
central office local loop (except for the client modem)
and is ideal for applications such as remote access to
an Internet Service Provider (ISP), online service, or
corporate intranet. The modem can send upstream
data at speeds up to the V.34 rate.

TECHNICAL SPECIFICATIONS

The FM336Plus modem provides the processing core
for a complete facsimile modem design.

Configurations and Rates

The selectable modem configurations, signaling rates,
and data rates are listed in Table 2.

Automatic Mode Selection (-D / -D90)

When Automatic Mode Selection (AMS) is enabled,
the modem configures itself to the highest compatible
data rate supported by the remote modem. Automode
operation is supported in V.90 (-D90 only), V.34,
V.32 bis, V.32, V.22 bis, V.22, V.21, V.23, Bell 212A,
and Bell 103 modes.

Automatic Rate Adaptation

In V.34 duplex, V.34 half-duplex, and V.32 bis modes,
Automatic Rate Adaptation (ARA) can be enabled to
select the optimal highest acceptable data rate based
on the Eye Quality Monitor (EQM). This selection
occurs during startup.

Two ARA modes are available. ARA in ROM is an
adaptive selection made by the modem based upon a
fixed ROM table. ARA in RAM is based on the host
programmable RAM table and can be changed by the
user.

Data Encoding

The data encoding conforms to ITU-T recommendations
V.90 (-D90 only), V.34, V.32 bis, V.32, V.17, V.33,
V.29, V.27 ter, V.22 bis, V.22, V.23, or V.21, and is
compatible with Bell 208, 212A, or 103, depending on
the configuration.

Tone Generation

The modem can generate single or dual voice-band
tones from 0 Hz to 3600 Hz with a resolution of

0.15 Hz and an accuracy of ± 0.01%. Tones over
3000 Hz are attenuated. DTMF tone generation allows
the modem to operate as a programmable DTMF
dialer.

FM336Plus V.34/Group 3 High Performance Fax Modem Family

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Supervisory Tone Detection

Three parallel tone detectors (A, B, and C) are
provided for supervisory tone detection. The signal
path to these detectors is separate from the main
received signal path.

Each tone detector consists of two cascaded second
order IIR biquad filters. The coefficients are host
programmable. Each fourth order filter is followed by a
level detector which has host programmable turn-on
and turn-off thresholds allowing hysteresis. A pre-filter
and squarer precede tone detector C. This circuit is
useful for detecting a tone with a frequency equal to
the difference between two tones that may be
simultaneously present on the line. The SQDIS bit may
disable the squarer causing tone detector C to be an
eight-order filter. The tone detectors are disabled in
data mode.

The tone detection sample rate is 9600 Hz in V.8 and
V.34 modes and is 7200 Hz in non-V.34 modes. The
default call progress filter coefficients are based on a
7200 Hz sampling rate and apply to non-V.34 modes
only. The maximum detection bandwidth is equal to
one-half the sample rate.

Auto-Dialing and Auto-Answering Control

Features are provided to allow the host to perform
auto-dialing and auto-answering. These functions
include DTMF or pulse dialing, ring detection, and a
comprehensive supervisory tone detection scheme.
The major control parameters are host programmable.

Transmitted Data Spectrum

The transmitter spectrum is shaped by raised cosine
filter functions, either the square root of 12.5% (V.34,
V.32 bis, V.32), 20% (V.17, V.33, and V.29), 50%
(V.27 ter, Bell 208), or 75% (V.22 bis, Bell 212A).

Transmit Level

The transmitter output level is selectable from 0 dBm
to –15 dBm in 1 dB steps and is accurate to ±0.5 dB
when used with an external hybrid. The output level
can also be tuned by changing a gain constant in the
modem DSP RAM. The maximum V.34 transmit level
for acceptable receive performance should not exceed
–9 dBm.

Answer Tone (-D / -D90)

When the NV25 bit is a zero, the modem generates
a 2100 Hz answer tone at the beginning of the answer
handshake for 5.0 seconds (V.8) or 3.6 seconds
(V.32 bis, V.32, V.22 bis, V.22, V.23, and V.21). The
answer tone has 180° phase reversals every 0.45
seconds to disable network echo cancellers (V.8,
V.32 bis, and V.32).

Receive Level

The modem satisfies performance requirements for
received line signal levels from 0 dBm to –43 dBm
measured at the receiver analog (TIP and RING) input
in V.17, V.33, V.29, V.27 ter, and DTMF modes. In
V.90, V.34, V.32 bis, V.32, V.22 bis, V.22, and
V.23 modes, the receive level range is from –9 dBm
(–15 dBm at RIN) to –43 dB. (RIN is 6 dB lower than
TIP and RING.)

Carrier Recovery

The carrier recovery circuit can track a ±7 Hz
frequency offset in the received carrier.

Echo Canceller (-D / -D90)

A data echo canceller with near-end and far-end echo
cancellation is included for 2-wire duplex V.90/V.34/
V.32 bis/V.32 operation. The combined echo span of
near and far cancellers can be up to 40 ms. The
proportion allotted to each end is automatically
determined by the modem. The delay between near­end and far-end echoes can be up to 1.2 seconds.

V.34/Group 3 High Performance Fax Modem Family FM336Plus

101361A

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Table 2. Configurations, Signaling Rates, and Data Rates

Configuration Modulation Carrier

Frequency (Hz)

±0.01%

Data Rate (bps)

±0.01%

Symbol Rate

(Symbols/Sec)

Bits/Symbol

Data

Bits/Symbol

TCM

Constellation

Points

V.90 PCM PCM — 56000 R/V.34 rates T

(Note 4)

8000 Dynamic — —

V.34 33600 TCM** TCM Note 2 33600 3429 only Note 2 Note 2 Note 2
V.34 31200 TCM** TCM Note 2 31200 3200 min Note 2 Not e 2 Note 2
V.34 28800 TCM** TCM Note 2 28800 3000 min Note 2 Not e 2 Note 2
V.34 26400 TCM** TCM Note 2 26400 2800 min Note 2 Not e 2 Note 2
V.34 24000 TCM** TCM Note 2 24000 2800 min Note 2 Not e 2 Note 2
V.34 21600 TCM** TCM Note 2 21600 2400 min Note 2 Not e 2 Note 2
V.34 19200 TCM** TCM Note 2 19200 Note 2 Note 2 Note 2 Note 2
V.34 16800 TCM** TCM Note 2 16800 Note 2 Note 2 Note 2 Note 2
V.34 14400 TCM** TCM Note 2 14400 Note 2 Note 2 Note 2 Note 2
V.34 12000 TCM** TCM Note 2 12000 Note 2 Note 2 Note 2 Note 2
V.34 9600 TCM** TCM Note 2 9600 Note 2 Note 2 Note 2 Note 2
V.34 7200 TCM** TCM Note 2 7200 Note 2 Note 2 Note 2 Note 2
V.34 4800 TCM** TCM Note 2 4800 Note 2 Note 2 Note 2 Note 2
V.34 2400 TCM** TCM Note 2 2400 2400 only Note 2 Note 2 Note 2
V.32 bis 14400 TCM TCM 1800 14400 2400 6 1 128
V.32 bis 12000 TCM TCM 1800 12000 2400 5 1 64
V.32 bis 9600 TCM TCM 1800 9600 2400 4 1 32
V.32 bis 7200 TCM TCM 1800 7200 2400 3 1 16
V.32 bis 4800 QAM 1800 4800 2400 2 0 4
V.32 9600 TCM TCM 1800 9600 2400 4 1 32
V.32 9600 QAM 1800 9600 2400 4 0 16
V.32 4800 QAM 1800 4800 2400 2 0 4
V.22bis 2400 QAM 1200/2400 2400 600 4 0 16
V.22bis 1200 DPSK 1200/2400 1200 600 2 0 4
V.22 1200 DPSK 1200/2400 1200 600 2 0 4
V.22 600 DPSK 1200/2400 600 600 1 0 4
V.23 1200/75 FSK 1700/420 1200/75 1200 1 0 —
V.21 FSK 1080/1750 Up to 300 300 1 0 —
Bell 208 4800 DPSK 1800 4800 1600 3 0 8
Bell 212A DPS K 1200/2400 1200 600 2 0 4
Bell 103 FSK 1170/2125 Up to 300 300 1 0 —
V.17 14400 TCM/V.33 TCM 1800 14400 2400 6 1 128
V.17 12000 TCM/V.33 TCM 1800 12000 2400 5 1 64
V.17 9600 TCM TCM 1800 9600 2400 4 1 32
V.17 7200 TCM TCM 1800 7200 2400 3 1 16
V.29 9600 QAM 1700 9600 2400 4 0 16
V.29 7200 QAM 1700 7200 2400 3 0 8
V.29 4800 QAM 1700 4800 2400 2 0 4
V.27 ter 4800 DP S K 1800 4800 1600 3 0 8
V.27 ter 2400 DP S K 1800 2400 1200 2 0 4
V.21 Channel 2 FSK 1750 300 300 1 0 —

Notes:

1. Modulation legend:
TCM: Trellis-Coded Modulation
QAM: Quadrature Amplitude Modulation
PCM: Pulse Coded Modulation
FSK: Frequency Shift Keying
DPSK: Differential Phase Shift Keying

2. Adaptive; established duri ng handshake:

Symbol Rate (Baud) V.34 Low Carrier Frequency (Hz) V.34 High Carrier Frequency (Hz)

2400 1600 1800
2800 1680 1867
3000 1800 2000
3200 1829 1920
3429 1959 1959

3. ** For both duplex and half-duplex modes.

4. Maximum data rate.