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XO Selects Juniper Networks Routers to Complete Its National OC-192 IP Backbone Network

Business Customers in 63 XO U.S. Markets Benefit from Maximum Speed and Reliability for Voice and Data Services

Sunnyvale, CA - November 6, 2001 - Juniper Networks, Inc. (Nasdaq: JNPR), a leading provider of next-generation Internet Protocol (IP) infrastructure systems, and XO Communications, Inc. (Nasdaq: XOXO), a leading provider of broadband communications services, today announced XO Communications is deploying Juniper Networks M-series Internet routers in its new nationwide OC-192 (10 Gigabits per second speeds) backbone inter-city network.

A combination of Juniper Networks M160 Internet backbone routers and M40 Internet access routers, will deliver network throughput speed and routing intelligence to XO Communications' core network and to each of its individual markets. This network infrastructure will provide inter-city Internet and integrated voice and data services to business customers across 63 U.S. XO markets.

"The growing enterprise business XO customer base is clamoring for a variety of services, including toll-quality voice over a single IP backbone. The decision to upgrade from legacy platforms to Juniper Networks M-series Internet routers was based on their proven reliability, scalability, and performance," said Doug Carter, senior vice president and chief technology officer for XO Communications. "Combined with JUNOS Internet software features and the Internet Processor II ASIC, Juniper Networks Internet routers will provide XO the capability to offer new smart IP services including MPLS VPNs and voice over IP."

Juniper Networks M-series Internet routers will enable XO Communications to migrate traffic from its legacy network to a new single IP infrastructure, thus eliminating the need for numerous and separate voice, IP, and leased-line networks. The new XO network will feature OC-192 speeds, a 16-fold increase over the legacy XO OC-12c (622 Megabit per second speeds) network. With its new, multi-service OC-192 IP network, XO is expected to benefit from increased network speeds, enhanced performance, reduced maintenance and management expenses, and the elimination of costly leased lines.

Juniper Networks M160 Internet backbone routers have been deployed in XO's IP backbone "core-node" points of presence in the following eight cities: New York, Washington, D.C., Denver, Atlanta, Chicago, Dallas, Los Angeles, and San Jose.

XO is also deploying Juniper Networks M40 Internet access routers to efficiently direct and manage network traffic generated from XO metro fiber rings, supporting 63 U.S. cities, into the eight core network nodes for further distribution. All of the XO metro markets are expected be connected via dual OC-12 capacity circuits, providing one of the most robust and extensive metro uplink capabilities in the industry.

About XO Communications, Inc.

XO Communications is one of the world's leading providers of broadband communications services offering a complete set of communications services, including: local and long distance voice, Internet access, Virtual Private Networking (VPN), Ethernet, Wavelength, Hosting and Integrated voice and data services.

About Juniper Networks, Inc.

Juniper Networks, Inc. is a leading provider of purpose-built systems that meet the scalability, performance, density, and compatibility requirements of rapidly evolving, optically enabled IP networks. The company's systems provide new IP infrastructure solutions for the world's leading service providers. Juniper Networks service, manufacturing, and IP engineering teams work closely with customers to build and support customer networks. The company is headquartered in Sunnyvale, California. For more information, please visit the Web site at https://www.juniper.net/.

Juniper Networks is registered in the U.S. Patent and Trademark Office and in other countries as a trademark of Juniper Networks, Inc. M40 and M160 are trademarks of Juniper Networks, Inc. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners.