360networks Deploys The World's Most Extensive Optical Mesh Network.

Uses Sycamore Networks' intelligent optical switching and network

management equipment

VANCOUVER, Nov. 30 /PRNewswire/

- 360networks announced today it is now deploying the most extensive optical mesh network in the world with the installation of Sycamore Networks' optical switching and network management equipment in Europe and North America.

360networks plans to install more than 100 intelligent optical switches in major cities around the world by mid-2002. It is expected the switches will be installed in the majority of cities in North America and Europe where 360networks has large points of presence (POP) facilities by mid-2001, followed by South America in the second half of 2001 and Asia in early 2002.

"An optical mesh network provides us major competitive advantages," said Greg Maffei, president and chief executive officer of 360networks. "We can create and provision a variety of broadband services to customers in minutes, versus weeks with a traditional ring network architecture.

"We can provide our customers greater choice and flexibility, such as bandwidth on demand, variable protection options, and the ability to self- monitor and self-manage their network traffic."

Maffei added: "In addition, because we can introduce new services more quickly, we will be able to generate new revenue streams more quickly. No other carrier can do this on a global basis."

"The size and scope of 360networks' global network deployment is yet another proof point for the flexible, scalable power of the intelligent optical network," said Dan Smith, president and chief executive officer of Sycamore Networks. "We are pleased that 360networks is extending the range and reach of its network with Sycamore's innovative switching, transport and network management solutions."

360network's architecture will include the SN 16000 intelligent optical switch, SN 8000 intelligent optical transport products and SILVX(TM) optical network management system.

At the heart of 360networks' intelligent optical architecture is Sycamore's Broadleaf Network Operating System, extending the service range and reach of Sycamore's optical switching platforms. Using a combination of optical routing and signaling protocols, such as Open Shortest Path First (OSPF) and Multi-Protocol Label Switching (MPLS), Broadleaf enables Sycamore's switches to create and provision quickly optical light paths to deliver high- speed, customized services.

About Sycamore

Sycamore Networks (NASDAQ: SCMR) develops and markets intelligent optical networking products that transport voice and data traffic over wavelengths of light. The Company combines significant experience in data networking with expertise in optics to develop intelligent optical networking solutions for network service providers. Sycamore's products are based on a common software foundation, enabling concentration on the delivery of services and end-to-end optical networking. Sycamore's products and product plans include optical transport, access and switching systems and end-to-end optical network management solutions. Contact Sycamore Networks at www.sycamorenet.com.

About 360networks

360networks (NASDAQ: TSIX and TSE: TSX) offers broadband network and co- location services to telecommunications and data-centric organizations. 360networks is developing one of the largest and most technologically advanced fiber optic mesh networks in the world. By mid-2002, the planned network will span 142,000 kilometers (88,000 miles) and link more than 100 major cities with terrestrial routes and submarine cables joining North America, South America, Asia and Europe. 360networks is also developing nearly 3.7 million square feet of network co-location space. More information is available at www.360.net.

Forward looking statements: This document may contain statements about expected future events and financial results that are forward looking in nature, and, as a result, are subject to certain risks and uncertainties. Scheduled completion of network segments may not be met because of factors, such as construction, permitting or licensing delays. Actual results may differ materially from those projected by management. For such statements, we claim the safe harbor for "forward looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995.