Marconi and Allot Communications Partner for Delivery of Traffic Management and Analysis Services

LAS VEGAS, Oct. 24 /PRNewswire-FirstCall/ -- (TELECOM '05) -- Marconi Corporation plc (London: MONI and Nasdaq: MRCIY) and Allot Communications today announced a partnership in which Marconi will jointly market Allot's NetEnforcer(R) family of network monitoring, traffic and subscriber control applications.

Allot Communications is the industry's leading provider of high- performance traffic and service management solutions. Utilizing advanced deep packet inspection (DPI) technology, Allot's award-winning NetEnforcer traffic management solution allows carriers, internet service providers and cable operators to monitor and control network behavior at the subscriber and/or application level, enabling premium IP services, streamlining converged network traffic and protecting the network from malicious security threats.

"Our partnership with Allot Communications provides us with a key application to tackle some of the biggest problems facing service providers today, such as understanding the composition of network traffic, while ensuring that key services receive the bandwidth and priority they require," said Dave Bifulco, director of IP business development for Marconi. "For both business and consumer broadband environments, applications that generate key revenue (such as voice, video and online gaming) can be protected against other applications that swamp the network with less profitable traffic. The latest traffic management capabilities within Allot's NetEnforcer provide broadband operators with a powerful tool for taking back control of their networks."

Marconi and Allot Communications also see Marconi's Dynamic Services Blade as a platform for the delivery of the NetEnforcer traffic management application. Marconi's Dynamic Services Blade, an integrated standards-based module for the Marconi Service Router, allows hosted service applications in a completely open standard Linux operating environment. The Marconi Service Router enables service providers to "virtualize" their networks by centralizing distributed resources on a single device, resulting in a number of benefits, including lower capital and operational expenditures, easier upgrades, streamlined management and faster service rollout.

"Next-generation network architectures will require more than just cost management; for example, they require specific ways of controlling operational costs and creating linkages to the applications that will drive revenues," said Tom Nolle, president of CIMI Corp, a leading U.S. telecoms consultancy. "Marconi has a truly unique approach to IP service networks - one that facilitates both new services and evolving higher-layer applications."

"The Marconi Service Router is an ideal concept for delivering the NetEnforcer capabilities," said Azi Ronen, EVP of corporate development for Allot Communications. "It enables the NetEnforcer service and traffic control application to be cost-effectively offered to service providers in a secure, virtually routed environment." About TELECOM '05

Held in the Venetian Conference Center in Las Vegas, Nevada, on October 24-26, 2005, TELECOM '05 is a preview of what's next for the communications industry. Recently named one of the "Fastest 50" growing trade shows in North America by TradeShow Week magazine, TELECOM '05 draws key communications leaders from around the world to view new technologies and learn more about all aspects of the communications industry as lines between cable, wireline, wireless and satellite platforms continue to blur. For more information on TELECOM '05, visit http://www.telecom05.com. About Allot Communications

Allot's high-performance traffic management solutions are deployed by some of the world's largest service providers, enterprises and universities to improve application performance, control bandwidth costs and optimize network efficiency. In enterprise networks, Allot's highly scalable solutions help network managers ensure quality of service (QoS) by linking business policies to specific network actions that improve user productivity and contain networking costs. In service provider networks, Allot's QoS and service level agreement (SLA) enforcement capabilities maximize return on investment by managing over-subscription, throttling P2P traffic and delivering tiered rate plans along with a host of innovative service capabilities. About Marconi Corporation plc

Marconi Corporation plc is a global telecommunications equipment, services and solutions company. The company's core business is the provision of innovative and reliable optical networks, broadband access technologies, data networks and related professional and support services. The company's customer base includes many of the world's largest telecommunications operators.

The company is listed on the London Stock Exchange under the symbol MONI and on NASDAQ under the ticker MRCIY. Additional information about Marconi Corporation can be found at http://www.marconi.com. All brands or product names are trademarks of their respective holders. This press release contains forward-looking statements with respect to products, partners, customers, future growth and other matters. Please refer to the Form 10-K report filed by Marconi Corporation plc with the United States Securities and Exchange Commission for a discussion of risks that could cause actual results to differ materially from such statements. Marconi Press and Industry Analyst inquiries:

Colleen Rosander tel: 724-742-7794; email: colleen.rosander@marconi.com Marconi Investor inquiries:

Karen Keyes tel: +44 207 306 1345; email: karen.keyes@marconi.com Booth no. 727

TELECOM '05

24th-26th October 2005

Las Vegas, Nevada USA