Specifications

|Modems
4
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 using industry-standard DMT line-code technology.
The versatile USB ADSL CPE chipset is a cost-effective solution
optimized for today’s market, which demands ease-of-installation
without opening the PC.
The USB interface is specifically designed for quick and easy
peripheral installation. Its architecture makes it ideal for high-
speed applications like an ADSL modem. With its Plug-and-Play
installation and its ubiquitous support among today’s PCs,
USB is becoming the interface of choice for today’s PC users.
USB Controller
Conexant’s P52 USB controller is a bridge between the CX11627
DMT datapump and the USB interface. It provides the control,
interface, and data manipulation for the datapump, AFE, and
line driver, and is compliant with the USB 1.1 specification.
DMT Datapump
The CX11627 DMT datapump is a T1.413 Issue 2, G.992.1,
and G.992.2-compliant DSP. The device performs DMT
modulation/demodulation, ATM TC, 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 highbandwidth, low
noise, and superior linearity.
Optimized USB ADSL Solution
This device set consists of a USB controller, a DMT datapump, an
AFE and a line driver. The PC drivers use only a fraction of the
PC’s host processor.
Conexant’s softSAR technology provides the ATM SAR function
as part of the PC driver. This eliminates the need for a costly
dedicated ATM SAR device required in other ADSL modems.
However, in order not to unnecessarily burden the host and the
USB, 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 additional ATM SAR device, Conexant’s
AccessRunner is the most cost-effective, optimized solution
designed for the USB.
ADSL Drivers
Conexant’s PC drivers are designed for use with Windows
®
98,
Windows
®
ME, Windows
®
2000, and Windows
®
XP, and fully
leverage Microsoft’s built-in features for the support of USB ADSL
peripherals. In addition to softSAR functionality, the drivers fully
support the recognized standards for PPP over ATM (RFC2364),
PPP over Ethernet (RFC2516), Ethernet bridging/routing ATM
(RFC1483) and classical IP over ATM (RF1577). 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.
Features
• 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
- ATM AAL5
- OAM F4/F5
• USB Interface
- Compliant with USB specification 1.1
- USB full speed (12 Mbps)
- Vendor specific descriptors
- Bus-powered
• Operating System Support
- Windows 98
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