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Reston/Munich, Mar.13.01
For the trade press

WorldCom places 3.2 Terabit/s of Traffic on
Existing Network Fiber

Trial Doubles Optical Internet Transmission Capacity
Using Multi-Terabit Platform from Siemens/ Optisphere

WorldCom Inc., and Siemens Information and
Communication Networks (ICN) Inc., through its optical
networking subsidiary Optisphere Networks Inc., today
announced they have boosted the world record for
transmission capacity of data, video and voice traffic on
a single installed WorldCom network fiber to a stunning
3.2 Terabits per second. The month-long technology trial
was an industry first for both companies. A record 7
Terabit/s of capacity, over a single fiber, was
demonstrated in ICN´s Munich laboratories already last

Using existing WorldCom fiber network routes in the Dallas
metropolitan area, this increased transmission capacity is
equivalent of sending more than 3.2 million high-speed Internet
connections or 41 million telephone calls at the same time on
one fiber. The ability to send greater amounts of data at
increased transmission rates maximizes the use of existing
fiber and enables WorldCom to deliver a greater supply of
bandwidth to the market to satisfy the nation's increasing
demand for bandwidth-intensive services. To achieve this
industry first, the companies deployed 80 wavelengths of 40
Gigabits per wavelength for a total capacity of 3.2 Terabits per
second. This achievement further establishes WorldCom as
the leading provider of advanced network and data services
while building upon the WorldCom's vision of becoming the
preeminent communications company for the digital

"This new technology by Siemens/Optisphere is a giant step
forward in delivering increased bandwidth to customers," said
Fred Briggs, WorldCom chief technology officer. "It will allow
us scale our network, while continuing to drive down the cost of
bandwidth, by leveraging the capability of our embedded fiber

Siemens Optical Networks president and Optisphere CEO
Jost Spielvogel commented: "Building on five years
development of 40 Gbit/s technology, this demonstrates the
most bandwidth and cost-effective dense wavelength division
multiplexing technology to date. As bandwidth demand
increases, it allows our customers to squeeze the most out of
every fiber available."

WorldCom's globally owned and operated network is the most
diverse, scalable and flexible digital communications network
in the world. "We are standards-based and vendor
independent," Briggs said. "We continue to challenge our
communications equipment vendors to develop the highest
quality of next-generation technology. Our vendors allow us to
use the most innovative technology available today which gives
us the edge to be the industry leader in network expansion."
The new capacity record was achieved using
Siemens/Optisphere's TransXpress Infinity DWDM platform
and FOX 40 Gbit/s multiplexer. Eighty WDM channels with an
individual capacity of 40 Gbit/s were transmitted over three
spans of standard single mode fiber with a total link length of
250 km. TransXpress Infinity is a flexible, modular DWDM
platform allowing for terabit transmission (e.g. 80 x 40 Gbit/s or
up to 160 x 10 Gbit/s) with the same amplifier platform using
technologies such as Raman amplification, enhanced link
control and optical add-drop multiplexing. The TransXpress
FOX mutliplexer is an integral part of Siemens' optical node
concept, including technologies such as adjustable dispersion
compensation, polarization mode dispersion compensation
and forward error correction.

WorldCom and Siemens have been working together in
developing innovative optical networking solutions for several
years. In 1998, WorldCom was the first service provider to
install Siemens' 16-channel, 10 Gbit/s DWDM system. The
new world record represents a further milestone in their joint
effort of continuous improvement of optical networks. Research
and development at Siemens promises even larger capacity
increases in the future. Earlier this year, WorldCom placed 1.6
Terabits per second on a fiber pair.

WorldCom (NASDAQ: WCOM) is a preeminent global
communications company for the digital generation, operating
in more than 65 countries with 2000 revenues of approximately
$40 billion. WorldCom provides the innovative technologies
and services that are the foundation for business in the 21st
century. For more information, go to

Optisphere Networks Inc. develops and markets innovative
systems for the global optical networks market. Optisphere
provides optical terabit solutions for IP-optimized transport;
routing and channel aggregation functions that help customers
increase services, generate revenues and reduce total
operating costs. A subsidiary of Siemens Information and
Communication Networks Inc., Optisphere is headquartered in
Reston, Va. For more information:

Siemens Information and Communication Networks
Siemens Information and Communication Networks Group
(ICN) is a leading provider of integrated voice and data
networks for enterprises, carriers and service providers. Its
comprehensive portfolio comprises, in particular, IP-based
convergence solutions, and a full range of products for
broadband access, optical transport networks as well as the
integration, services and applications business. The Siemens
Group thus provides complete solutions from a single source
for the infrastructure of the Next Generation Internet, a
prerequisite for mobile business. In fiscal year 2000 (year-end
30 September) ICN posted sales of 11.4 billion Euro, and
earnings before interest and taxes (EBIT) of 692 million Euro.
ICN employs 53,000 people worldwide. Further information
about ICN is available at:
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