AT&T creates world's 1st V.FAST modem!!!
MOHIT K GOYAL
======
Date: 1993-02-09,23:31
From: PAT DEARIE
To: ALL
Subject: Modem Speed Record
I came across this article in the February 1993 issue of "Electronic
Products". It looks like modem speeds are about to take a major jump.
Modem achieves worlds's fastest speed over standard phone lines
Richard Pell Jr.
A modem that transmitts data at a rate of 28,800 bits/s over
standard telephone lines has been developed by Largo, FL-based AT&T
Paradyne. According to the company, the modem achieves the world's
fastest such transmission speeds and helps prepare the way for the
forth coming CCITT V.fast communications standard, which is expected
to be approved late this year or early 1994.
Currently, the fastest standard modem speed is 14.4 kbits/s, as
specified by the CCITT V.32bis standard. The V.fast specification,
which was originally to have covered speeds of first 19.2 and then
24 kbits/s, is intended to address the 28.8-kbit/s transmission
rate. When used with error correction and data compression, modems
operating at this speed will be capable of providing a throughput
rate of up to 115.2 kbits/s.
AT&T says it is the first company to have provided actual
28.8-kbit/s test results to the CCITT V.fast committee. The only
other 28.8-kbit/s test results were achieved by companies using
simulated modem modulations, rather than with actual modems. AT&T's
modem is based on a chipset currently used in the company's
Comsphere 3800 products, and uses a new modulation scheme to achieve
its speed.
A modulus conversion enables the device to tramsmit data at
nonlinear nonintegrated numbers of bits per symbol. According to
Richard McCartney, Product Marketing Manager, the modem appears to
operate reliably even over relatively poor lines.
Prior to the approval of V.fast, the company intends to make the
modem available to customers who need the high speed and are not
concerned with what would still be a proprietary modulation scheme.
Users of the company's Comsphere 3800 products will be able to
upgrade their existing modems to the V.fast standard when it becomes
a reality. For more information, contact AT&T Paradyne at
800-482-3333.
======
REPOST