Comcast, Cisco and Nortel Plan to Collaborate to Improve Multivendor Interoperability

Philadelphia, PA.

Comcast (Nasdaq: CMCSA; CMCSK), the nation's leading provider of cable, entertainment and

communications products and services, today announced its intention to form an Open Transport Initiative (OTI). The OTI's primary objective is to improve the interoperability between Optical and IP network layers and compatibility among multiple vendors' equipment within Comcast's network.

Comcast plans to work with Nortel and Cisco as the first vendors in this


The initial phase of the Open Transport Initiative will focus on providing

operators, such as Comcast, greater network and bandwidth agility. The OTI

plans to first identify and define a set of common interfaces, which will be

used to integrate and manage Nortel DWDM (dense wavelength division

multiplexing) and Cisco IP equipment. Such open interfaces will help improve

the vendors' ability to interoperate seamlessly within the same transport

infrastructure, making it simpler to combine Optical and IP technologies on

the same network.

"This collaboration is a natural and much-needed step in the evolution of

network technology and the interoperability of multi-vendor networks," said

Dave Fellows, Comcast's Chief Technology Officer. "Comcast is proud to work

with Cisco and Nortel, because of their technology vision and their expertise

in integrating large, diverse networks."

"Together with Cisco and Comcast, we plan to support the broader adoption

of the common interfaces that result from this initiative," said Philippe

Morin, General Manager, Optical Networks, Nortel. "This effort will enable

the removal of operational barriers that currently exist between IP and

optical networks and establish an intelligent, high bandwidth 'service on

demand' network capable of delivering any service, over any path -- optical or

copper -- with complete operational simplicity."

"Cisco has a long tradition of supporting industry standards and promoting

industry-wide interoperability in order to accelerate innovation and customer

adoption," said Tony Bates, senior vice president and general manager of the

Carrier Core Multiservice business unit at Cisco. "Our enhancements to the

Cisco CRS-1 product family -- including 10G DWDM interfaces, 40Gbps packet

interconnect over 10G DWDM transport and control plane enhancements make this

vision a reality. We believe there are significant CAPEX and OPEX benefits to

be gained by tight integration of IP and photonic technologies in the network

and are happy to work with Comcast and Nortel toward these goals."

Under this agreement, the parties will explore a number of objectives,


* Next-generation photonic line interfaces that define power levels, wavelengths, modulation schemes, Optical signal-to-noise ratio (SNR) and wavelength identification. * Align with standards compliant encapsulation mechanisms for forward error correction (FEC) and operations, administration, maintenance and provisioning (OAM&P) to allow alien International Telecommunication Union Telecommunication Standardization Sector (ITU-T) wavelengths to be transported across the transmission layer. (i.e., ITU-T wavelengths on service platforms directly connected to transmission layer). * Link status interface based on industry standards (with extensions for dense wavelength division multiplexing [DWDM] transport), designed to determine the operational state and configuration on the edge of the network between an edge device and the photonic domain. * Ethernet-based optical supervisory interface for inter-photonic domain communications. * Distributed Optical control plane, which enables functions such as discovery, photonic routing, performance management, monitoring and adding/deleting of channels. * Extending the Internet Engineering Task Force (IETF) generalized multi- protocol label switching (GMPLS) signaling and routing standard with extensions for the photonic domain - to address service activation, restoration, path viability, wavelength selection and other photonic aspects.

Comcast, Nortel and Cisco plan to promote the adoption of these defined

common interfaces as open industry standards through standards bodies as

appropriate and to promote broader interoperability between multiple vendor

platforms within the global optical and IP industry.

About Cisco Systems

Cisco Systems, Inc. (Nasdaq: CSCO), the worldwide leader in networking for

the Internet. Information about Cisco can be found at http://www.cisco.com.

For ongoing news, please go to http://newsroom.cisco.com.

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

http://www.nortel.com. For the latest Nortel news, visit


About Comcast

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.