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
Full-Rate and G.lite ADSL Modem Delivers
End-to-End Internet Connectivity
Conexant's AccessRunner low-power PCI-based ADSL chipset and
PC driver solution is optimized to address the growing demand
for high-speed Internet access. AccessRunner is a controllerless
solution that is fully compliant with both the full-rate ADSL
(T1.413 Issue 2 and G.dmt) and the `splitterless' G.lite (G.992.2)
standards. Compliance ensures that products based on the
AccessRunner solution can address the existing installed base
and continued deployment of ADSL lines.
Conexant's AccessRunner modem is an "always on" high-speed
broadband connection to the Internet. Using existing twisted
pair telephone lines, ADSL technology provides data rates over
100 times the speed of a traditional analog modem, without an
interruption in telephone service. With up to 8 Mbps downstream
and 1 Mbps upstream data transfer rates, ADSL is the ideal
solution for high-bandwidth applications such as access to
a corporate network, Internet access, and video delivery.
Conexant's ADSL chipsets support the full range of ADSL
standards based on industry standard discrete multitone (DMT)
line-code technology. The versatile PCI ADSL client-side chipset
is a cost-effective solution optimized for today's PC market.
T1.413 lssue 2, G.992.1 (G.dmt), and
G.992.2 (G.lite) compliant
PCI ADSL chipset and drivers
Full-rate ADSL and G.lite operation
Optimized controllerless ADSL architecture
Interoperable with key central-site equipment
"Always on" connection to the Internet
Over 100 times faster than analog modems
Operates on existing standard telephone lines
No interruption in telephone service
D i s t i n g u i s h i n g F e a t u r e s
AccessRunner
P C l A D S L M o d e m D e v i c e S e t
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
PCI Controller
The P46 PCI controller is a bridge between the
CX11627 DMT datapump and the PCI bus. It provides
the control, interface, and data manipulation for the
datapump, analog front end (AFE), and line driver.
It is compliant with the PCI 2.2 specification and
supports power management.
DMT Datapump
The CX11627 DMT datapump is a T1.413 Issue 2,
G.992.1, and G.992.2 compliant digital signal
processor (DSP). The device performs DMT
modulation/demodulation, ATM transmission
convergence (TC), forward error correction (FEC)
encoding/decoding, data synchronization, and
data interleaving. Control and initialization of
the datapump is done by the host PC as part
of the software drivers.
Analog Front End
The CX20431 (AFE) is designed for use in full-rate
and G.lite ADSL modems. The receive path filters out
unwanted echo and boosts the wanted signal before
performing an A/D conversion. The transmit path
converts digital data to analog signals and performs
a smoothing operation before presenting the signals
to the line driver.
Line Driver
The integrated CX20441 line driver is more
cost-effective and power-sensitive than a discrete
solution, and is optimized for full-rate and G.lite
ADSL modems. It has high bandwidth, low noise,
and superior linearity.
Figure 1. ADSL PCI modem device set
Figure 2. AccessRunner PCI ADSL
modem device set
AccessRunner
P C l A D S L M o d e m D e v i c e S e t
Optimized Controllerless ADSL Solution
The PCI ADSL device set is shown together with the PC drivers
in Figure 1. It consists of a PCI controller, a DMT datapump,
an AFE, and a line driver. Using only a fraction of the PC's host
processor, this controllerless solution eliminates the need for
costly microcontrollers and external memory required
in other ADSL modems.
In addition, Conexant's `softSAR' technology provides the ATM
segmentation and reassembly (SAR) function as part of the PC
driver. However, in order not to unnecessarily burden the host
PC and the PCI bus, the idle cell insertion and deletion that takes
place when no information is being transferred across the ADSL
link is performed as part of the chipset.
Without the need for an external microcontroller or memory,
Conexant's AccessRunner is the most cost-effective, optimized
solution for the PC environment.
ADSL Drivers
Conexant's PC drivers are designed for use with Windows 98,
Windows 2000, Windows ME, Windows XP, and fully
leverage Microsoft's built-in features for the support of
ADSL adapter cards. In addition to softSAR functionality,
the drivers fully support the recognized standards for PPP
over ATM (RFC2364), PPP over Ethernet (RFC2516), Ethernet
bridging/routing over ATM (RFC1483), and classical IP over
ATM (RFC1577). A control panel applet is provided for real-time
diagnostic information, and hooks are included to allow
automatic configuration of the ADSL modem and the drivers.
Portfolio of ADSL CPE
In addition to the products described in this product brief,
Conexant offers several variations of its ADSL technology
in the form of:
PCI ADSL chipsets
PCI ADSL/V.92 chipsets
PCI ADSL/V.92/HomePNA/LAN chipsets
USB ADSL chipsets
USB ADSL/V.92 chipsets
Ethernet/USB ADSL bridge chipsets
Ethernet/USB ADSL router chipsets
HomePNA ADSL router chipsets
Multiport ADSL router chipsets
The unique advantage of this broad portfolio of CPE
solutions is the leveraging of a common ADSL core engine
(DMT processor, AFE, and Line Driver) across all of the
solutions. This ensures widespread interoperability and
strong performance among all of the CPE offerings.
Additionally, the driver applications such as Installation
Wizard, Control Panel, and Taskbar application are also
leveraged among all of the USB and PCI solutions.
Likewise, the Ethernet, HomePNA, and Multiport
bridge/router solutions, share a common web server for
configuration. This synergy allows an OEM to have a
common look and feel for all of its CPE solutions across
the various form factors. Furthermore, each of the driver
applications and web server are completely OEM
customizable, including multi-language support,
enabling easy branding and promotion of a portfolio
of CPE solutions.
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
ADSL Compliance
Compliant with ADSL standards
Full-rate ANSI T1.413 Issue 2 and
ITU G.dmt (G.992.1)
Splitterless ITU G.lite (G.992.2)
DMT modulation and demodulation
Rate adaptive
Max downstream 8 Mbps
Max upstream 1 Mbps
Supports splitterless
full rate operation
Time detection for low power mode
Dying Gasp
Interoperable with all major
DSLAMs
ATM Protocols
WAN mode support: PPP over ATM
(RFC2364) and PPP over Ethernet
(RFC2516)
LAN mode support: bridged/routed
Ethernet over ATM (RFC1483) and
classical IP over ATM (RFC1577)
ATM Forum UNI 3.1/4.0 PVC
ATM SAR (segmentation
and reassembly)
ATM AAL5
OAM F4/F5
PCI Interface
Compliant with PCI
specification 2.2
Supports power management
Operating System Support
Windows 98
Windows 98 SE
Windows 2000
Windows ME
Windows XP
Windows 95
Windows NT 4.0
Linux 2.2.16 and 2.4.2
Driver Applications
Windows Control Panel
Installation Wizard
Task Bar Application
All applications are customizable
All applications support
multiple languages
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# 100371C
01-0668
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
AccessRunner is a registered trademark of Conexant Systems, Inc.
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