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| [NET & COM '99] ADSL Featured in Fast Internet Access Demo
February 5, 1999 (TOKYO) -- Demonstrations of high-speed access to the
Internet using asymmetric digital subscriber line (ADSL) technology
and cable modems highlighted the "Network Frontline: Home Corner" area
at NET & COM '99.
|The products in both demonstrations are equipped with the latest technology.
They had their first unveiling in Japan at NET & COM '99, a showcase
of corporate systems and networking products which runs Feb. 3-5 at
Makuhari Messe in Chiba prefecture near Tokyo.
ADSL is a modem technology that enables data transmission
over existing copper-wire cables at speeds of up to several megabits
per second. Nippon Telegraph and Telephone Corp. (NTT) plans to offer
an ADSL service called "ADSL Access Line" starting this fall.
The main products demonstrated at NET & COM '99 are leading-edge ADSL
modems that conform to the G.992.2 standard (formerly "G.lite") defined
by the International Telecommunications Union (ITU-T). The G.992.2 specification, which NTT will adopt in ADSL Access Line, delivers data
rates of up to 1.5Mbps downstream and up to 512kbps upstream.
Also at the show was a personal computer from Compaq Computer Corp. equipped
with a G.lite modem card from Aware Inc. of the United States. This
computer can connect to the Internet via an ADSL line. G.lite modems
from companies such as PairGain Technologies Inc. of the United States
and Orckit Communications Ltd. of Israel are available too.
Cable modems enable high-speed data transmission over a cable television
(CATV) network. A succession of Internet-over-CATV services using cable
modems have started operating in Japan. Attracted by the promise of
rapid full-time access to the Internet for around 5,000 yen (US$45)
per month, subscriber numbers are surging.
The cable modems at the show meet the Data Over Cable Service Interface
Specification (DOCSIS) 1.0 standard, and will start shipping this spring.
DOCSIS is a cable modem standard defined by the Multimedia Cable Network
System Partners' (MCNS), an industry group of CATV operators. Subscribers
share downstream bandwidth of 42Mbps and upstream bandwidth of 10Mbps.
Nippon Motorola Ltd. is conducting its own demo using cable modems for
high-speed Internet access.
In addition, Soliton Systems KK is giving voice-over-IP (VoIP) demos,
using a cable modem from 3Com Japan KK. Visitors can see for themselves
how VoIP works over a cable infrastructure and test the voice quality.
� Doubts Remain About NTT's ADSL Service
� Nippon Telegraph and Telephone to Offer ADSL Service
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