V.92 SmartACF
TM
Modem
Conexant's SmartACF V.92 modem device set with SmartDAA
TM
technology enables modem designers to develop a single
worldwide modem for desktop PCs, Internet appliances and
portable units with minimum design effort. Features available
with V.92 are quick connect, PCM upstream and modem-on-hold.
The device set supports analog data at up to 56 Kbps, analog fax
at up to 14.4 Kbps, telephone answering machine (TAM)/telephony
extensions and voice/speakerphone (optional). The new V.44
standard is also supported. This new data-compression protocol
delivers data rates faster than those achieved by the V.42
bis protocol.
V.92 Features
Quick Connect
This feature approximates the "always on" connection of broadband
access solutions by enabling dial-up modems to complete the
modem handshake sequence 30% to 40% faster than before.
PCM Upstream
Using a new modulation for upstream data (a variation of
PCM), V.92 supports a maximum upstream data rate of 48 Kbps,
as compared to 33.6 Kbps for V.90. At the maximum rate, this
represents a 40% improvement in upstream throughput. Users
will also see throughput improvements when uploading digital
audio and image files.
Modem-on-Hold
Call waiting is a popular feature offered by many telephone
companies around the world. Unfortunately, a call-waiting
event may disconnect a modem when it is in use, frustrating
the user and often prompting a call to the OEM or ISP support
center. Modem-on-hold allows the modem to remain online
during a call-waiting event, thereby eliminating the need to
redial to get back on the Internet.
D i s t i n g u i s h i n g F e a t u r e s
V.92 features: quick connect,
modem-on-hold and PCM upstream
SmartDAA allows for a single
worldwide design
V.44 data-compression protocol increases
data rates faster than those achieved by
the V.42 bis protocol
C X 8 1 3 0 0
p e r s o n a l c o m p u t i n g p r o d u c t s
f e a t u r e s a n d s p e c i f i c a t i o n s
ITU-T data modem -V.92
- ITU-T V.90/K56flex, V.34, V.32 bis, V.32,
V.22 bis, V.22, V.23, and V.21; Bell 212A
and Bell 103
- V.44, V.42 LAPM and MNP 2-4
error correction
- V.42 bis and MNP 5
data compression
- V.250 and V.251 commands
Fax modem send and receive
rates up to 14.4 Kbps
- V.17, V.29, V.27 ter, and V.21 channel 2
- EIA/TIA 578 Class 1 and T.31 Class 1.0,
and EIA/TIA 578 Class 2 commands
Downloadable architecture
- Downloadable MCU firmware
from the host/DTE to flash ROM
- Downloadable MDP code modules
from the MCU transparent to the host
Telephony/TAM
- V.253 commands
- 2-bit and 4-bit Conexant ADPCM, 8-bit
linear PCM, and 4-bit IMA coding
- 8 KHz sample rate
- Concurrent DTMF, ring,
and Caller ID detection
Full-duplex speakerphone (FDSP)
mode using optional CX20437
voice codec (S models)
- Microphone and speaker interface
- Telephone handset or
headset interface
- Acoustic and line echo cancellation
- Microphone gain and muting
- Speaker volume control and muting
SmartDAA technology
- Eliminates many costly traditional
DAA discrete components
- Reduces modem and DAA
board footprint
- Allows a single modem board
design to be approved for
worldwide shipments
- Line-in-use detection
- Remote hang-up detection
- Extension off-hook detection
- Call Waiting detection
- Digital PBX line protection
Industry-standard
communication commands
Selectable host interface with
speeds up to 230.4 Kbps
- Parallel 16550A UART-compatible
interface
- Serial ITU-T V.24 (EIA/TIA-232-E)
logical interface
Direct mode (serial DTE interface)
Flow control and speed buffering
Automatic format/speed sensing
Serial async/sync data; parallel
async data
Thin packages support low-profile
designs (1.6 mm height)
- CX81300 MCD: 128-pin TQFP
- CX20463 LSD: 32-pin TQFP
- CX20437 VC: 32-pin TQFP
+3.3V operation with +5V-tolerant
digital inputs
Typical power use
- MCD and LSD: 415 mW (normal
mode); 75mW (sleep mode)
- VC: 5 mW (normal mode)
Available in V.34 and
V.32 bis modems in
pin-compatible packages
Applications
Worldwide desktop modems
External serial modems
Remote monitoring and
data-collection systems
Standalone TAM/fax machines
Conexant's patent-pending SmartDAA technology
eliminates the need for the costly analog transformer,
relays and opto-isolators typically used in discrete data
access arrangement (DAA) implementations. The SmartDAA
architecture also simplifies product implementation by
eliminating the need for country-specific board configurations
and enables worldwide homologation of a single modem
board design and a single bill of materials (BOM).
The system-powered SmartDAA operates reliably without
drawing power from the line. Line-powered DAAs, on the
other hand, operate poorly when the line current is insufficient
due to long lines or poor line conditions. Enhanced features,
such as monitoring of local extension status without going
off-hook, are also supported.
Incorporating Conexant's proprietary, patent-pending digital
isolation barrier (DIB) design and other innovative DAA
features, the SmartDAA architecture simplifies application
design, minimizes layout area and reduces component cost.
Device Details
The SmartACF device set consists of a CX81300 modem
controller and DSP (MCD) in a 128-pin thin quad flat pack
(TQFP), and a CX20463 SmartDAATM line side device (LSD)
in a 32-pin TQFP. It supports data/fax/TAM operation with
a hardware-based modem controller, digital signal
processing, and DAA/telephone line interface functions.
The speakerphone option (S models) supports position-
independent, full-duplex speakerphone (FDSP) and analog
cellular operation.
www.conexant.com
General Information:
U.S. and Canada: (800) 854-8099
International: (949) 483-6996
Headquarters Newport Beach
4311 Jamboree Rd, P.O. Box C
Newport Beach, CA 92660-3095
Order# E-101389B
01-0359
2001, Conexant Systems, Inc. All Rights Reserved.
Conexant and the Conexant logo are trademarks
of Conexant Systems, Inc. Other trademarks are
owned by their respective owners. Although Conexant
strives for accuracy in all its publications, this material
may contain errors or omissions and is subject to
change without notice.
THIS MATERIAL IS PROVIDED AS IS
AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE AND NON-INFRINGEMENT.
Conexant shall not be
liable for any special, indirect, incidental or consequential
damages as a result of its use.
Product Features
SmartDAA
PDF 
ZIP