Demonstration of PBT Interoperability at Carrier Ethernet World Congress Geneva, Switzerland September 24 - 28 GENEVA, SWITZERLAND -- (MARKET WIRE) -- 09/24/07 -- The world's largest and most diverse Carrier Ethernet multi-vendor interoperability demonstration will feature PBB and PBT technology pioneered by Nortel(1) (TSX: NT)(NYSE: NT). At the Carrier Ethernet World Congress (CEWC), September 24 to 28, Nortel will join members of the Carrier Ethernet Ecosystem including ANDA Networks(2), Extreme Networks(2), Gridpoint Systems(2), Hammerhead Systems(2), Ixia(2), RAD Data Communications(2), Soapstone Networks(2), Spirent Communications(2) and TPACK(2) to demonstrate the cost benefits and interoperability of Carrier Ethernet technology. In total, some 24 leading vendors participated in the event, believed to be one of the largest of its kind to date. Carrier Ethernet delivers simple, cost-effective Ethernet for service providers who need the benefits of scalable, reliable, secure and manageable networks to deliver the Quality of Service (QoS) characteristics of carrier-grade transport technology. The interoperability demonstration at CEWC is the live culmination of the hot staging and evaluation of Carrier Ethernet interoperability conducted at the European Advanced Networking Test Center (EANTC) laboratory(2) in Berlin during August. The demonstration will feature Provider Backbone Bridges (PBB) and Provider Backbone Transport (PBT) technology, which uses industry-standard Ethernet to drive a radical change in the economics of carrier networks. PBT is being incorporated into the emerging standard IEEE 802.1Qay (Provider Backbone Bridge - Traffic Engineering). "Carrier Ethernet is changing the game for service providers, it lowers the cost and complexity of metro networks while making available resources to meet the growing bandwidth requirements required of networks." said Peter Newcombe, president, Carrier Networks Europe, Middle East and Africa, Nortel. "The interoperability demo at CEWC shows conclusively that PBT can be successfully deployed in a multi-vendor environment and is ready for carrier deployments worldwide - and it really delivers on the Nortel promise of Business Made Simple." Also, at this year's Carrier Ethernet World Congress, Nortel will deliver the following key sessions: - Considering the value of PBT as a connection-oriented Carrier Ethernet solution - Mervyn Kelly, director, product management, Nortel - Looking forward to Next-Generation Ethernet technologies, systems and services - Dave Allan, consultant architect, Office of the CTO, Nortel Nortel and the Carrier Ethernet ecosystem successfully demonstrated the following in the interoperability test: - Interoperability with the MPLS core network to enable end-to-end Ethernet services - Resilient PBT trunks with sub 50ms protection switching - Simplified operations by placing the network under the control of the latest PBT tunnel and service provisioning systems To learn more visit Nortel at the Carrier Ethernet World Congress, Geneva, Switzerland, September 24 - 28, 2007 where you can meet Nortel experts to discuss some of the topics raised during the conference sessions and find out how to implement PBT as a simple and cost-effective Carrier Ethernet solution. About Nortel Nortel is a recognized leader in delivering communications capabilities that make the promise of Business Made Simple a reality for our customers. Our next-generation technologies, for both service provider and enterprise networks, support multimedia and business-critical applications. Nortel's technologies are designed to help eliminate today's barriers to efficiency, speed and performance by simplifying networks and connecting people to the information they need, when they need it. Nortel does business in more than 150 countries around the world. For more information, visit Nortel on the Web at www.nortel.com. For the latest Nortel news, visit www.nortel.com/news. Certain statements in this press release may contain words such as "could", "expects", "may", "anticipates", "believes", "intends", "estimates", "targets", "envisions", "seeks" and other similar language and are considered forward-looking statements or information under applicable securities legislation. These statements are based on Nortel's current expectations, estimates, forecasts and projections about the operating environment, economies and markets in which Nortel operates. These statements are subject to important assumptions, risks and uncertainties, which are difficult to predict and the actual outcome may be materially different from those contemplated in forward-looking statements. For additional information with respect to certain of these and other factors, see Nortel's Annual Report on Form10-K, Quarterly Reports on Form 10-Q and other securities filings with the SEC. Unless otherwise required by applicable securities laws, Nortel disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. (1)Nortel, the Nortel logo and the Globemark are trademarks of Nortel Networks. (2)This is a 3rd party link as described in our Web linking practices. Contacts: Nortel Greta Brown +44 1628 432968 Email: [email protected] Nortel Pat Cooper (425) 450-7523 Email: [email protected] Website: www.nortel.com