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ST70134 Datasheet

ASCOT ADSL MODEM CHIP SET FOR CPE

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ST70134 - ST70135A
ASCOT ADSL MODEM CHIP SET FOR CPE
PRODUCT PREVIEW
s COMPLETE CHIP SET FOR ADSL CPE
MODEM
s COMPLIANCE WITH ANSI T1.413 ISSUE
1 & ISSUE 2
s COMPLIANCE WITH G.992.1 (FULL RATE)
& G.992.2 (G. LITE)
s IMPLEMENTS DISCRETE MULTITONE
(DMT) MODULATION AND DEMODULA-
TION ON CPE SIDE
s DATA RATES UP TO 8Mbps DOWNSTREAM
AND TO 1Mbps UPSTREAM WITH 32Kbps
GRANULARITY
s BUILT-IN ATM TRANSPORT
s SUPPORT ADAPTIVE RATE MODE IN
32Mbps INCREMENTS
s 255/128 CARRIERS WITH 4.3125KHz
SPACING
s DEDICATED SOFTWARE DRIVER AVAILABLE
s PROCESSOR INDEPENDENT C++ SOURCE
COMPILATION
s FREQUENCY DIVISION MULTIPLEXING
(FDM) FOR HIGH ROBUSTNESS IN PRES-
ENCE OF CROSSTALK
s REED-SOLOMON FORWARD ERROR
CORRECTION
s TRELLIS CODER AND DECODER
s PROGRAMMABLE SIMULTANEOUS SUP-
PORT OF INTERLEAVED AND NON-INTER-
LEAVED CHANNELS (DUAL LATENCY)
s FULL, REDUCED AND MINIMAL ATM
OVERHEAD FRAMING MODES
s BIT STREAM MODE CAPABLITY FOR STM
TRANSPORT
s DIRECT CONNECTION TO ATM SYSTEMS
VIA UTOPIA INTERFACE (LEVEL 1 OR 2)
s MICROCONTROLLER INTERFACE WITH
16 BITS MULTIPLEXED ADDRESS/DATA
BUS
s LOW POWER TECHNOLOGY: 1.3w TOTAL
s SINGLE 3.3V POWER SUPPLY
s 0 TO +70°C OPERATING TEMPERATURE
RANGE
APPLICATIONS
s HIGH SPEED INTERNET ACCESS
s REMOTE ACCESS TO CORPORATE NET-
WORK FOR TELECOMMUTERS AND
BRANCH OFFICES
s VIDEO-ON-DEMAND OVER TWISTED PAIR
s CPE ADSL MODEMS, AND ROUTERS
s ADSL PC NIC's
s G. LITE CPE SPLITTERLESS APPLICA-
TIONS
TQFP64
PQFP144
ORDERING NUMBERS:
ST70134 (TQFP64)
ST70135A (PQFP144)
April 2000
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1/8


STMicroelectronics Electronic Components Datasheet

ST70134 Datasheet

ASCOT ADSL MODEM CHIP SET FOR CPE

No Preview Available !

ST70134 - ST70135A
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 operates at CPE end of the loop
(ATU-R mode). Reed-Solomon forward error
correction plus Trellis coding with or without
interleaving in internal interleaving RAM provides
maximum noise immunity (see Figure 3).
Interleaving is optional and can be used
simultaneously on a slow channel (e.g., for data or
control info) while a fast channel (e.g., video)
operates without interleaving. ICs include rate
adaptation capabilities during show time.
In transmit direction the chip set allows to select
an attenuation of the signal in case of short loops
or large echo (politeness). In receive direction the
chip set can optionally control an external
multiplexer to select an external attenuation of the
signal in case of short loops, and provide a 2-bit
output external gain control.
ASCOT chip set
ASCOT is a two-chip ADSL modem transceiver.
STMicroelectronics provides the necessary
software for transceiver’s external controller.
ASCOT can easily be hooked up with ATM
systems through the built-in UTOPIA level 2/1
interface. That allows ATM traffic to be carried at
up to 8Mbit/s downstream and 1Mbit/s upstream,
over a very plain and widespread twisted pair.
ASCOT is intended for use at ATU-R end.
The modem control software can be compiled as
C++ code, independently on the processor used.
Figure 1 : ADSL modem block configuration
The driver can be interfaced to any external real
time operating system.
These pages block diagrams show the main
functions built-in in ST70134 and ST70135A.
ASCOT chip set supports three different rate
adaptation modes: fixed rate adaptation mode,
fixed with capability to boost within fixed range,
dynamic rate adaptation during show time.
Modem’s performances are set by the following
parameters: Rate adaptation mode, Downstream
and Upstream bit rate for both latency paths,
Noise margins (min, max and target typically at
10E-7 BER without RS, interleaving and trellis),
Maximum power spectral density for downstream,
Maximum power for both up and downstream,
Carrier mask (which tones are disabled),
maximum interleaving delay.
Tones from number 8 to number 255 can be used:
from 8 to 31 for upsteam signals and from 32 to
255 for downstream signals. Numbers 16 and 64
(96 for ADSL over ISDN) are dedicated to pilot
tones which are employed for synchronisation
purposes with ATU-C end. The software sets the
use of tones for optimisation of performances.
Time recovery is carried out by the chip-set
through the pilot tones. This activity is undertaken
in two steps in order to achieve no more than
2ppm with ATU-C.
The transceiver controller software monitors line
and channel. As far as line is concerned noise
margin, attenuation, power, carrier load, relative
capacity occupation are checked.
Channel’s monitoring deals with cell-delineation,
actual ATM (fast and interleaved) up and
downstream rates.
UTOPIA
DMT MODEM ST70135A
AFE
ST70134
µ CONTROL
MEMORY
χ
χ
UTP
2/8


Part Number ST70134
Description ASCOT ADSL MODEM CHIP SET FOR CPE
Maker ST Microelectronics
Total Page 8 Pages
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