ITU V.92 and V.44 Voiceband Modem Standards Take Another Significant Step Forward
Geneva, 4 July 2000
– The ITU agreed on three important new standards for voiceband modems in Edinburgh,
Scotland, last week, at a meeting of the ITU-T Working Party 1/16 responsible
for modem specifications.
Building on the success
of the now ubiquitous V.90 Recommendation for modems at data rates up to 56kbit/s,
important enhancements have now been agreed in new Recommendation ITU-T V.92.
The enhancements are:
- an increase of more than
40% in the maximum data rate towards the network to a new maximum of 48 kbit/s
on the best connections;
- significantly quicker
start-up times on recognized connections, and;
- the ability to put the
modem ‘on-hold’ when the network indicates that an incoming call is waiting.
These enhancements will
give significant benefits to the modem user with improved access to interactive
services, and the option of exploiting voice response facilities associated
with Internet browsing.
The Chairman of ITU-T Study
Group 16, Mr Pierre-André Probst noted "These important new features will
further improve the Internet users experience by significantly reducing connect
times and providing improved access to new Internet services."
The meeting, jointly hosted
by industry leaders 3Com, Conexant Systems, Lucent Technologies and Motorola,
also initiated approval of a new Recommendation on data compression techniques
in V.44, and a Recommendation V.59 which defines new procedures for facilitating
modem and connection fault-finding.
The new data compression
Recommendation is based on the LZJH compression algorithm developed by US-based
Hughes Network Systems and gives an improvement in compression of more than
25% beyond the existing Recommendation V.42bis, and a data compression ratio
in the region of 6:1 for a typical Web browsing connection. The net result is
data throughput rates in excess of 300 kbit/s compared with typical values of
150-200 kbit/s today, thus significantly reducing download times and speeding
up web browsing. These rates are still below those available from emerging DSL
technologies, but have the advantage of not requiring any special installation
on the part of the network provider, leaving upgrades to the direct control
of ISPs and users.
attention is going to DSL technologies these days, but the voiceband modem will
remain the pre-dominant worldwide access technology for many years to come and
these important new Recommendations will help users to get the most from this
technology” said John Magill, the Chairman of the ITU-T Working Party 1/16.
For further information,
ITU-T Working Party 1/16
Director, ITU Telecommunication
+44 1666 51 01 05
+44 1666 51 01 49
+41 22 730 5860
+41 22 730 5853
The International Telecommunication
Union (ITU) is a global organization where the public and private sectors cooperate
for the development of telecommunications and the harmonization of national
With the first approval
phase of the three standards now completed, the work programme is on target
for final approval at the next meeting of Study Group 16 in November 2000 at
which time these standards will come into effect if unanimously adopted.