Comcast Selects Nortel's Next-Generation Optical Solution for Converged National IP Backbone; Advanced Network Supports the Rapid Delivery of New Services Across 35 States.

TORONTO -- Comcast Corporation (Comcast), the leading U.S. provider of cable, entertainment and communications products and services, has selected a next-generation optical solution from Nortel (NYSE/TSX: NT) for its converged national IP backbone.

Nortel will be supplying a DWDM solution that includes the Nortel Common Photonic Layer (CPL) and Optical Multiservice Edge (OME) 6500 platforms, as well as a full suite of implementation, integration, and support services.

Comcast is building a complete, scaleable, and integrated service delivery network for analog and digital video, high-speed Internet, commercial business, and digital voice services for its broad base of customers across 35 states. The network's converged IP and optical technology will enable Comcast to deliver new services, now and into the future. The network's intelligent architecture will also intuitively manage content distribution, based on user demand for high-bandwidth applications.

"We selected Nortel for their advanced next-generation optical technology and experience in building networks of this scale," said Dave Fellows, CTO of Comcast. "We were also very impressed with their strategic direction towards common open standards within the optical industry."

"Nortel's optical architecture provided a simple and intelligent approach for scaling the network while directing popular new services, such as Video on Demand (VoD) and multimedia communications to any IP location. This flexibility will enable Comcast to cost-effectively expand these services, which can drive unpredictable traffic flows on our converged IP network," continued Fellows.

Comcast's optical deployment utilizes enhanced ROADM (reconfigurable optical add drop multiplexing) capabilities in Nortel's CPL platform to dynamically reallocate optical bandwidth as needed across the network, enabling a significant reduction in time-to-market for the introduction of new high-bandwidth services.

"Comcast has been an innovator in the introduction and delivery of advanced services, and a visionary in the convergence of optical and IP networking," said Dan Mondor, general manager, Global Cable Solutions, Nortel. "The industry-leading capabilities offered by Nortel's next-generation optical solutions will enable Comcast to meet the dynamic service demands of their broad customer base. We look forward to working with Comcast in delivering standards-based technology innovation and creating a new, open model for optical networks."

Deployed in more than 1,000 customer networks in 65 countries, Nortel's end-to-end optical networking portfolio includes next generation SONET/SDH, optical switching, wave division multiplexing and Optical Ethernet products. Nortel has deployed more than 329,000 optical network elements globally.

About Comcast Corporation

Comcast Corporation (Nasdaq: CMCSA, CMCSK) (http://www.comcast.com) is the nation's leading provider of cable, entertainment and communications products and services. With 21.4 million cable customers, 8.1 million high-speed Internet customers, and 1.2 million voice customers, Comcast is principally involved in the development, management and operation of broadband cable networks and in the delivery of programming content.

The Company's content networks and investments include E! Entertainment Television, Style Network, The Golf Channel, OLN, G4, AZN Television, PBS KIDS Sprout, TV One and four regional Comcast SportsNets. The Company also has a majority ownership in Comcast-Spectacor, whose major holdings include the Philadelphia Flyers NHL hockey team, the Philadelphia 76ers NBA basketball team and two large multipurpose arenas in Philadelphia. Comcast Class A common stock and Class A Special common stock trade on The NASDAQ Stock Market under the symbols CMCSA and CMCSK, respectively.

About Nortel

Nortel is a recognized leader in delivering communications capabilities that enhance the human experience, ignite and power global commerce, and secure and protect the world's most critical information. Serving both service provider and enterprise customers, Nortel delivers innovative technology solutions encompassing end-to-end broadband, Voice over IP, multimedia services and applications, and wireless broadband designed to help people solve the world's greatest challenges. Nortel does business in more than 150 countries. For more information, visit Nortel on the Web at www.nortel.com. For the latest Nortel news, visit www.nortel.com/news.

Certain information included in this press release is forward-looking and is subject to important risks and uncertainties. The results or events predicted in these statements may differ materially from actual results or events.

Factors which could cause results or events to differ from current expectations include, among other things: the outcome of regulatory and criminal investigations and civil litigation actions related to Nortel's restatements and the impact any resulting legal judgments, settlements, penalties and expenses could have on Nortel's results of operations, financial condition and liquidity, and any related potential dilution of Nortel's common shares; the findings of Nortel's independent review and implementation of recommended remedial measures; the outcome of the ongoing independent review with respect to revenues for specific identified transactions, which review will have a particular emphasis on the underlying conduct that led to the initial recognition of these revenues; the restatement or revisions of Nortel's previously announced or filed financial results and resulting negative publicity; the existence of material weaknesses in Nortel's internal control over financial reporting and the conclusion of Nortel's management and independent auditor that Nortel's internal control over financial reporting is ineffective, which could continue to impact Nortel's ability to report its results of operations and financial condition accurately and in a timely manner; the impact of Nortel's and NNL's failure to timely file their financial statements and related periodic reports, including Nortel's inability to access its shelf registration statement filed with the United States Securities and Exchange Commission (SEC); the impact of management changes, including the termination for cause of Nortel's former CEO, CFO and Controller in April 2004; the sufficiency of Nortel's restructuring activities, including the work plan announced on August 19, 2004 as updated on September 30, 2004 and December 14, 2004, including the potential for higher actual costs to be incurred in connection with restructuring actions compared to the estimated costs of such actions;

cautious or reduced spending by Nortel's customers; increased consolidation among Nortel's customers and the loss of customers in certain markets; fluctuations in Nortel's operating results and general industry, economic and market conditions and growth rates; fluctuations in Nortel's cash flow, level of outstanding debt and current debt ratings; Nortel's monitoring of the capital markets for opportunities to improve its capital structure and financial flexibility; Nortel's ability to recruit and retain qualified employees; the use of cash collateral to support Nortel's normal course business activities; the dependence on Nortel's subsidiaries for funding; the impact of Nortel's defined benefit plans and deferred tax assets on results of operations and Nortel's cash flow; the adverse resolution of class actions, litigation in the ordinary course of business, intellectual property disputes and similar matters; Nortel's dependence on new product development and its ability to predict market demand for particular products; Nortel's ability to integrate the operations and technologies of acquired businesses in an effective manner; the impact of rapid technological and market change; the impact of price and product competition; barriers to international growth and global economic conditions, particularly in emerging markets and including interest rate and currency exchange rate fluctuations; the impact of rationalization and consolidation in the telecommunications industry; changes in regulation of the Internet; the impact of the credit risks of Nortel's customers and the impact of customer financing and commitments; general stock market volatility; negative developments associated with Nortel's supply contracts and contract manufacturing agreements, including as a result of using a sole supplier for a key component of certain optical networks solutions; the impact of Nortel's supply and outsourcing contracts that contain delivery and installation provisions, which, if not met, could result in the payment of substantial penalties or liquidated damages; any undetected product defects, errors or failures; the future success of Nortel's strategic alliances; and certain restrictions on how Nortel and its president and chief executive officer conduct business.

For additional information with respect to certain of these and other factors, see the most recent Annual Report on Form 10-K and Quarterly Report on Form 10-Q filed by Nortel 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.

Nortel, the Nortel logo and the Globemark are trademarks of Nortel Networks.