CX11252 Conexant Systems, Inc., CX11252 Datasheet - Page 2

• Manufacturer Part Number: CX11252
• Description: Hsfi Pci Software Modem Device
• Manufacturer: Conexant Systems, Inc.

V.92 Soft Modems
V.92 – The New Standard
V.92 is the new dial-up modem specification from
the ITU (International Telecommunications Union)
which incorporates exciting new features:
• Quick connect
• Modem-on-hold
• V.44 compression
• PCM (high-speed transmission) upstream
• NetWaiting.
Quick connect shortens the time to make a
connection by remembering (“training”) the
phone line characteristics and storing them for
future use. Typically, the modem “handshake”
to make a connection takes from 25 to 27 seconds.
Quick connect will cut the handshake time by
50%, averaging 13 seconds for most calls.
Many households use the same phone line for voice
and Internet. When a user is browsing the Internet
and incoming call either cannot get through or it
interrupts the user’s connection. Modem-on-hold
allows users to receive an incoming call and stay
connected to the Internet. Conversely, users can initiate
a voice call and still keep their modem connection.
NetWaiting is bundled with the V.92 modem
chipset and driver. It offers a host of customizable
features that brings full functionality to the
modem-on-hold feature.
PCM upstream boosts the data rates between the
user and the Internet to reduce upload times for large
files and email attachments. A maximum of 48 Kbps
upstream rate, a 40% improvement achieved. PCM
upstream works particularly well with new equipment
such as Internet-connected digital cameras, which
primarily upload rather than download information.
P C l / A C - L l N K / U S B
™
V.44 compression is a new compression algorithm
for faster download of popular HTML content from
the Internet achieving downloads about 30% faster
for a more pleasant end user experience.
The SmartDAA Architecture
Conexant’s proprietary SmartDAA technology
eliminates the need for costly relay and opto-isolators
typically used in discrete DAA implementations.
The SmartDAA provides all of the interface circuitry,
off-hook relay, loop current holding, impedance
matching and ring detection. It is designed to
meet both USA and international line interface
requirements, with enough flexibility to meet all
worldwide regulatory requirements.
The PC Host system-powered (via the PCI and AC-LINK
bus) SmartDAA operates reliably without drawing
power from the telephone line. Line-powered DAAs
operate poorly when the line current is insufficient
because of long lines or poor line conditions.
SmartDAA delivers a host of features, including:
• Call-waiting detection
• Extension pickup detection
• Line-in-use detection
• Remote hang-up detection
• European Handset Exclusion
SmartDAA technology consists of three components.
A system side device (System PCI or AC-LINK inter-
face), a Digital Isolation Barrier (discrete components,
high-voltage barrier) and a Line Side Device (CODEC,
hybrid, line protection and DC loop).
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