Analog Devices Announces
Next-Generation ADSL Chipset
New Enhanced Chipset Supports ADSL Over ISDN, Features Integrated ATM
Interfacing Capability, Offers Increased Data Rates and Complies With
Industry's Strictest Requirements for Spectral Compatibility
NORWOOD, Mass., Sept. 28 /PRNewswire/ -- Analog Devices, Inc. (NYSE: ADI - news) today
announced its next-generation, standards-compliant ADSL (asymmetric digital subscriber line)
chipset. The new enhanced ADSL chipset incorporates several new features including trellis coding,
reduced overhead framing, ADSL over ISDN (integrated services digital network), symmetric
service and built-in ATM (asynchronous transfer mode) interface. The AD20msp918 also includes
improved digital filtering that exceeds the requirements of T1.413, to deliver strict spectral masks,
necessary for distortion-free, low-noise transmission and optimum Internet access without affecting
other users. The chipset is fully compliant to all the international standards such as the UAWG LITE
splitterless document, ITU G.dmt (including Annex B) and the latest version of ANSI T1.413.
''As the first and most widely adopted supplier of DMT-based ADSL chipsets to the worldwide
telecommunications and modem industry, our customers look to us to provide the most up-to-date,
standards-compliant, feature-rich ADSL chipset,'' said Russ Johnson, Vice President and General
Manager of Analog Devices' Communications Division. ''The introduction of the AD20msp918 is
just that and more. It is bringing the industry one step closer to true, universal, wide-scale mass
market ADSL deployment and implementation. ADSL is here, and we have the technology that
realizes all of its advantages.''
The AD20msp918 is a five-chip ADSL solution that incorporates an ATM modem interface,
discrete multi-tone co-processor, an analog front-end, line driver/receiver, digital signal processor
(DSP) and configuration and management software. The AD20msp918 chipset is compliant with
industry standards set by the American National Standards Institute under ANSI T1.413 Issue 1
and 2, the European Telecommunications Standards Institute ETSI TR328, and ITU standards for
G.dmt, and will comply with new splitterless G.Lite as soon as ITU specifications are issued.
Fully compatible and proven interoperable with the previous generation chipset, the AD20msp918
offers increased configurable data rates to 6.1 Mbps simplex, 224 kbps duplex over carrier serving
area loop, and optimum Internet access at 4.5 Mbps downstream/450 kbps upstream. On short
loops, an AD20msp 918-based modem can achieve speeds in excess of 10 Mbps.
The new chipset has a flexible bin assignment, so software can decide which tones are used for
upstream or downstream. This allows support for ADSL over ISDN (per ETSI TM6 & ITU G.dmt
Annex A for the U.S. and B for Europe), an important capability for the European
telecommunications infrastructure to enable data and voice communications. In addition,
non-standard applications such as Symmetric DSL or enhanced upstream services for business users
can be delivered.
The AD20msp918 offers ATM interfacing to the ADSL modem using a standard UTOPIA 2 port,
which supplements the original digital interface and control. The integrated ATM interface allows for
increased flexibility in adopting new multimedia applications and facilitating diverse data types, as
well as an overall reduction in cost of ownership. In addition, the co-processor supports a simple
synchronous serial interface for other data-oriented protocols such as HDLC (high level data link
controller), frame relay, or IP (Internet Protocol).
A new DMT co-processor replaces the first generation's DMT accelerator for dual-line, two-way
simultaneous transmission of data, voice and video. Specifically designed for superior Quality of
Service (QoS) levels, the AD20msp918 features a rate-adaptive design that automatically adjusts to
line characteristics and delivers the best possible performance, regardless of indigenous line
conditions.
ADI's expertise in mixed-signal design is reflected in the analog front-end, which performs the analog
and mixed-signal operations for analog-to-digital conversion, digital-to-analog conversion and signal
filtering and control. The chipset's software, developed in partnership with Aware Inc.
[Nasdaq:AWRE - news], is user programmable to ensure smooth, upward migration and provides
embedded object-code software controls for both modem and management/control functions (API
or protocol stack). The solution is capable of handling real-time functions, including performance
logging and statistics gathering operations.
Pricing and Availability
The AD20msp918 chipset will be priced at $50 with limited sampling available now, through Analog
Devices. High-volume production is slated for Fall 1998. |
