The AD20msp918 is a
next-generation solution
that can push the speed of
data transmission over
conventional telephone
lines to 8 Mbps
60 times faster than
traditional ISDN and over
150 times faster than V.90
voice-band modems.
FEATURES
Flexible bin assignment: supports ADSL over ISDN (per ETSI TM6 & ITU
G.992.1 Annex B), enhanced upstream or symmetric data rates
ATM (UTOPIA 1 or 2) or STM interfaces. Complete software control
protocol stack/API
Complete data pump in five-chip set: includes DMT co-processor, analog
front end, line driver, host processor and interface/framer
Standards compliant: supports ANSI T1.413 Issue 1 and 2, ETSI TR328,
ITU G.992.1 and G.992.2 (G.lite)
Implements DMT (discrete multi-tone) technology as adopted by ANSI,
ETSI and ITU
Supports configurable data rates: 6.1 Mbps simplex, 224 kbps duplex
over carrier serving area loop; optimum Internet access at 4.5 Mbps
downstream/450 kbps upstream; absolute maximum 12 Mbps/1 mbps
Rate adaptive: operates at best possible rate for specific line conditions
Fully compatible with AD20msp910
AD20msp918
G.Lite ADSL Chipset
NEW ADSL CHIPSET WITH UTOPIA
INTERFACE
Analog Devices enables asymmetric digital sub-
scriber line (ADSL) equipment manufacturers to
bring true standards-based solutions to market
quickly at a price point that end-users can afford.
Our ADSL products convert ordinary telephone
wires to high-speed broadband communication
pipelines and provide seamless interoperability
with today's telecom networks.
The AD20msp918 is designed to meet current
ANSI T1.413 Issue 2, ETSI TR328 and ITU
G.992.1 and G.992.2 industry standards. Full
functionality in this five-chip set includes DSP
host processing, analog front-end driver/receiver
and object code software for user adaptability and
control. Based on the industry standard
AD20msp910, the AD20msp918 improves and
simplifies next-generation designs and reduces
equipment manufacturing costs.
AD816
(Driver/
Receiver)
AD6437
AD6438
AD6439
To RAM
(Interleave)
ADSP-2183
Host Processor
To Boot
EPROM
Control Message
ATM
Serial
To Line And
POTS Splitter
Or ISDN Splitter
Analog Devices, Inc., 1999. All rights
reserved. Trademarks and registered
trademarks are the property of their
respective companies.
Printed in the U.S.A. HXXXX-X.X-X/99
The AD20msp918 comprises a DMT co-processor, analog front end, line driver,
DSP host processor and interface/framer circuitry to speed and simplify the development
of ADSL systems.
THE AD20MSP918
INCLUDES:
Modem Interface
The AD6438 chip provides the
interface between the chipset
and external systems using a
standard UTOPIA 2 port (byte
wide or serial; cell or byte
mode). It inserts ATM cells into
an ADSL line and implements
both standard and reduced over-
head framing per ANSI T1.413
Issue 2.
Discrete Multi-Tone
Co-processor
The AD6439 performs critical
digital signal processing opera-
tions needed to implement the
DMT protocol.
Analog Front End
The AD6437 performs the ana-
log and mixed-signal operations
required by an ADSL system,
including analog-to-digital con-
version, digital-to-analog conver-
sion, signal filtering and control.
Line Driver/Receiver
The AD8016 implements the
driver and amplifier functions
necessary to transmit ADSL
signals. The AD8022/AD812
implement the receiver func-
tions separately, eliminating
any chance of crosstalk.
Digital Signal Processor
The ADSP-2183 is a versatile,
general-purpose, 16-bit fixed-
point DSP with 80 kbytes of
internal RAM. The DSP is used
for training (measuring the line),
controlling operations, and acts
as a general-purpose system
controller.
Configuration and
Management Software
The AD20msp918's bundled
software controls modem config-
uration and management.
FUNCTIONALLY COMPLETE
Unlike functionally deficient solu-
tions, the AD20msp918 combines
all the essential hardware and
software needed to build a com-
plete ADSL modem, including a
DMT (discrete multi-tone) co-
processor, analog front end, line
driver, DSP host processor and
interface/framer circuitry.
Bundled with data pump
firmware and software to provide
a full protocol stack for data con-
trol and management, the result
is a complete solution that can
push the speed of data transmis-
sion over existing telephone lines
to 8 Mbps 60 times faster than
ISDN and over 150 times faster
than V.90 voice-band modems.
STANDARDS BASED
The AD20msp918 employs DMT
technology standardized by the
American National Standards
Institute under ANSI T1.413.
This standard was adopted
by the European Telecommunic-
ations Standards Institute
(ETSI TR328), endorsed by the
International Telecommunications
Union (ITU G.992.1) and is
currently recognized as the only
standard that ensures interoper-
ability and improves system
performance.
RATE ADAPTIVE FOR
OPTIMUM THROUGHPUT
As a rate adaptive chipset, the
AD20msp918 ensures the highest
data throughput by assessing the
condition and transport capacity
of each line. It continuously
adapts its operation to achieve the
best possible data rate.
In low power customer
premises equipment (CPE), for
example, the AD20msp918 can
drive data upstream at 450 kbps
(within 12,000 feet/3.7 km). The
AD20msp918 automatically
adjusts to line characteristics and
noisy environments and offers a
low-noise solution when neighbor-
hood wires are within the same
cable trunk. More importantly, it
ensures seamless interoperability
with other standards-based sys-
tems.
In equipment built for internet
service providers (ISPs) and cen-
tral offices, the AD20msp918 will
maximize a subscriber's down-
stream network access and speed
the transmission of multi-service
(DSL, Frame Relay, and ATM)
data, voice and video alike.
Many equipment manufactur-
ers of datacom and telecom
ADSL modems, switches, routers,
and CPE systems already use
Analog Devices' ADSL chipsets
as their core signal processing
engines. There are good reasons
to join our growing list
of customers.
CUT TIME TO MARKET AND
SAVE DEVELOPMENT COSTS
The AD20msp918 can reduce the
engineering investment required
to design and test your next-
generation ADSL modem. As a
complete solution, the
AD20msp918 eases the develop-
ment of custom interfaces and
eliminates the need to design
around additional support com-
ponents. In the end, your stan-
dards-based modem will be ready
for market quicker.
NEW PRODUCT R&D
Analog Devices is constantly
working to develop new products
that meet the changing needs of
the telecom infrastructure. New
chipsets will address the need for
PCI Bus interface, lower power
consumption for subscriber-side
equipment, ATM (asynchronous
transfer mode) handshaking for
backbone switches and routers,
and non-standard 1.544 Mbps
Symmetrical DSL (SDSL)
systems.
REFERENCE DESIGNS AND
TECHNICAL SUPPORT
Analog Devices the company
with a legacy in high-perfor-
mance DSP, analog and mixed-
signal processing has the design
expertise and in-house manufac-
turing processes to give your
next-generation ADSL product
the support and technical back-
ing it deserves. We provide a full
range of support for modem man-
ufacturers, including a fully func-
tional reference design complete
with PC board layout, schemat-
ics, and off-the-shelf component
lists. Documentation includes
detailed data sheets and applica-
tion notes.
On-line applications assis-
tance is available over the phone.
Product demonstrations can be
arranged at your facility or at one
of ADI's many sales offices.
Analog Devices is a semicon-
ductor supplier with a consistent
record of dependable, on-time
delivery. We maintain full control
over the manufacturing process
from raw wafer to finished prod-
uct. And we have ample capacity
for high-volume analog and
digital productions.
FIRST TO MARKET
While other vendors scramble to
develop standards-compliant
ADSL solutions, Analog Devices
has everything you need now, off
the shelf. From full featured DSP
to analog and software. We meet
the needs of today's broadband
wired and wireless markets with
leadership in analog, digital,
mixed-signal processing, RF sig-
nal processing, data conversion,
interfacing and total system
design. So if time to market is
important to you, it's time to
connect with Analog Devices.
www.analog.com
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