GENERAL DESCRIPTION

The ADSL modem chip set with ATM interface provides all the active functions required to build a complete ATM-based ADSL modem from line interface to ATM UTOPIA bus. The chip set employs Discrete MultiTone modulation as specified in ANSI T1.413. The chip set can operate at either end of the loop (in ATU-C or ATU-R mode) with only changes in the microcontroller code. Reed-Solomon forward error correction plus Trellis coding with or without interleaving in internal interleaving RAM provides maximum noise immunity.

■ COMPLETE CHIP SET FOR ADSL MODEM FUNCTIONS

■ COMPLIANCE WITH ANSI T1.413 ISSUE 1 & ISSUE 2

■ IMPLEMENTS DISCRETE MULTITONE (DMT) MODULATION AND DEMODULATION

■ DATA RATES UP TO 8Mbps DOWNSTREAM AND TO 1Mbps UPSTREAM WITH 32Kbps GRANULARITY

■ BUILT-IN ATM TRANSPORT

■ SUPPORT ADAPTIVE RATE MODE IN 32Mbps INCREMENTS

■ APPLICABLE AT BOTH ENDS OF LOOP: ATU-C (LT) AND ATU-R (NT)

■ 255 CARRIERS WITH 4.3125KHz SPACING

■ DEDICATED SOFTWARE DRIVER AVAILABLE

■ PROCESSOR INDEPENDENT C++ SOURCE COMPILATION

■ FREQUENCY DIVISION MULTIPLEXING (FDM) FOR HIGH ROBUSTNESS IN PRESENCE OF CROSSTALK

■ REED-SOLOMON FORWARD ERROR CORRECTION

■ TRELLIS CODER AND DECODER

■ PROGRAMMABLE SIMULTANEOUS SUPPORT OF INTERLEAVED AND NON-INTERLEAVED CHANNELS (DUAL LATENCY)

■ FULL, REDUCED AND MINIMAL ATM OVERHEAD FRAMING MODES

■ BIT STREAM MODE CAPABLITY FOR STM TRANSPORT

■ DIRECT CONNECTION TO ATM SYSTEMS VIA UTOPIA INTERFACE (LEVEL 1 OR 2)

■ MICROCONTROLLER INTERFACE WITH 16 BITS MULTIPLEXED ADDRESS/DATA BUS

■ LOW POWER TECHNOLOGY: 1.3w TOTAL

■ SINGLE 3.3V POWER SUPPLY

■ -40 TO +85°c OPERATING TEMP RANGE

Applications

■ HIGH SPEED INTERNET ACCESS

■ REMOTE ACCESS TO CORPORATE NETWORK FOR TELECOMMUTERS AND BRANCH OFFICES

■ VIDEO-ON-DEMAND OVER TWISTED PAIR

■ ADSL MODEMS, DSLAMs, ROUTERS, AND CONCENTRATORS

■ ADSL PC NIC’s

■ LITE-ADSL T1.413 BASED FOR NT-SIDE SPLITTERLESS APPLICATIONS