AccessRunner
Controller-less ADSL Modem Device Set for PCI Applications
ADSL (Asymmetric Digital Subscriber Line) is a transmission
D20441 Line Driver Features
technology used to carry user data over a single twisted pair line
from the Central Office to the customer premises. The downstream
(Central Office to Customer Premises) direction typically supports
a much higher data rate than the upstream or return (Customer
Premises to Central Office) channel. This asymmetric nature lends
itself to applications like remote LAN access, Internet access, and
video delivery. The downstream data rates can go up to 8 Mbps.
The upstream data rates can go up to 1 Mbps. Actual data rates
depend on the transceiver implementation, loop length,
• Differential input and output line driver
• Thermal shutdown capability
• Line impedance matching during power-
down
• Fixed differential gain
11627 ADSL DMT Data Pump
Features
• Low power (0.5W) consumption
• DSP-based programmable ADSL data
pump
impairments, and transmitted power.
The Conexant ADSL Modem Device Set for PCI Applications is
based upon a scalable architecture. This architecture will enable
the device set to support an emerging set of ADSL specifications
called G.lite. G.lite is expected to make it possible for telcos to
deploy consumer-oriented, “always on” 1.5 Mbps Internet access
services without the need for splitter equipment or wiring changes
at the customer premises.
• No external Interleave RAM, 16 Kbytes
built-in
• Single 3.3V ± 5% power supply
• Echo cancellation
• Digital interface and rate buffering
• ADSL framing
• Forward Error Correction (FEC) encoding
and decoding and interleaving
• Constellation encoding/decoding
• IFFT modulation and FFT demodulation
• Transmit and receive signal digital filtering
• Time domain equalization
• Frequency domain equalization
• Clock recovery
• CRC and scrambling
• Digital interface framing
• ATM mode
• Bit-synchronous mode
Ordering Information
Product
Package
Device Number
AccessRunner P46 PCI Bus Interface
AccessRunner 11627 ADSL Discrete Multitone (DMT) Data Pump
AccessRunner 20431 Analog Front End
AccessRunner 20441 Line Driver
176-pin TQFP
176-pin TQFP
32-pin TQFP
16-pin SSOP
32-pin TQFP
P46
11627
20431
20441-12
20441-11
Revision History
Revision
Date
Comments
A
B
07/09/99
10/19/99
Initial release
Defined dash numbers and updated figures for 20441 line driver, changed document number from DSL-
015, A
Information provided by Conexant Systems, Inc. is believed to be accurate and reliable. However, no responsibility is assumed by Conexant for its use, nor any
infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of
Conexant other than for circuitry embodied in Conexant products. Conexant reserves the right to change circuitry at any time without notice. This document is
subject to change without notice.
Conexant products are not designed or intended for use in life support appliances, devices, or systems where malfunction of a Conexant product can reasonably be
expected to result in personal injury or death. Conexant customers using or selling Conexant products for use in such applications do so at their own risk and agree
to fully indemnify Conexant for any damages resulting from such improper use or sale.
Conexant, “What's Next in Communications Technologies”, AccessRunner, LANfinity, and the Conexant logo, are trademarks of
Conexant Systems, Inc.
Product names or services listed in this publication are for identification purposes only, and may be trademarks or registered trademarks of their respective
companies. All other marks mentioned herein are the property of their respective owners.
©1999, Conexant Systems, Inc.
All Rights Reserved
2
Conexant
Proprietary Information
Doc. No. 100394B
October 19, 1999
CONEXANT [ CONEXANT SYSTEMS, INC ]
