Spirent Communications Announces Condensed IP Telephony Test System for More Economical Voice and Video Telephony Service Rollout

Business Wire, June 7, 2005

ROCKVILLE, Md. -- Spirent's Distributed Abacus 53 IP Telephony and Video Rollout System Enables Carriers to Assess Network's Readiness to Support Voice, Video and Data at Multiple Points on the Network

Spirent Communications (NYSE:SPM) (LSE:SPT) today announced the availability of the Spirent Distributed Abacus 53 IP Telephony and Video Rollout System designed to assess and validate infrastructure performance, voice, and video media quality in pre-production, triple play networks.

Service providers competing to make triple-play service bundles available to customers face new challenges. They need to assure performance for both individual network elements and end-to-end voice and video services across complex and distributed packet and circuit infrastructures.

Spirent has condensed its award-winning Abacus 5000 IP Telephony Test Migration System into a smaller, more economical form factor ideally suited for distributed deployment at key locations on the network. It enables service providers and enterprises to reduce time to market of IP-based voice, video and data services, while meeting the quality requirements as perceived by users.

The economics of the Distributed Abacus 53 allow it to be perpetually reused in the network or the lab, thereby making service provider and enterprise VoIP rollouts affordable. In transferring Abacus 5000 technology into a smaller form factor, Spirent can test a wide range of protocols and interfaces presented by emerging triple-play services.

"Shrinking the Abacus 5000 into a smaller, less expensive package enables many of our service provider and enterprise customers to conduct network testing they couldn't do before," said Bahaa Moukadam, vice president, IP Telephony for Spirent Communications. "By testing on the network, it helps uncover issues that can go undetected even with the most rigorous lab testing."

Spirent's Distributed Abacus 53 IP Telephony and Video Rollout System solves converged network testing challenges by emulating real-time voice and video traffic to analyze media and signaling performance from multiple points on the network. It treats multiple Abacus 53 systems as a single, virtual system for testing services over IP and legacy network infrastructure. It also tests echo and one way delay, two key problem areas for service provider and enterprise networks.

In addition, Spirent offers an IP Telephony Network Assessment Service, delivering Spirent assistance with network analysis freeing customer resources to concentrate on the network deployment. The IP Telephony Network Assessment Service incorporates on-site Spirent Global Services expertise, an initial assessment of the customer's requirements, customized network analysis, corrective recommendations and, if necessary, a follow-on service with in-depth testing of specific problems.

This solution is featured in one of 20 new Spirent triple play test scenarios that cover the breadth of testing required to deliver required Quality of Service (QoS) to the customer. Testing each network element end-to-end, and managing the quality of services in the deployed network are all critical in today's battle for reliable delivery of bundled triple play services.

The Distributed Abacus 53 IP Telephony and Video Rollout System is available now.

About Spirent Communications

Spirent Communications (www.spirentcom.com) is a global provider of integrated performance analysis and service assurance systems that enable the development and deployment of next-generation networking technology such as Internet Telephony, broadband services, 3G wireless, global navigation satellite systems, and network security equipment. Spirent's solutions are used by more than 1,500 customers in 30 countries, including the world's largest equipment manufacturers, service providers, enterprises and governments. Spirent Communications reported 2004 revenue of $460 million and has 1,700 employees worldwide. The company is the largest business group of Spirent plc, traded on the London and New York Stock Exchanges (LSE:SPT) (NYSE:SPM) (CUSIP number: 84856M209). www.spirent.com. Spirent Communications' sales to the United States government are made through Spirent Federal Systems. www.spirentfederal.com

Spirent, Spirent Communications and the Spirent logo are trademarks of Spirent plc. All other trademarks or registered trademarks are held by their respective companies. All rights reserved.

This press release may contain forward-looking statements that are based on current expectations or beliefs, as well as assumptions about future events. By their nature, forward-looking statements are inherently predictive, speculative and involve risk and uncertainty because they relate to events and depend on circumstances that will occur in the future. You should not place undue reliance on these forward-looking statements, which are not a guarantee of future performance and are subject to factors that could cause Spirent's actual results to differ materially from those expressed or implied by these statements. These risks include the risks described from time to time in Spirent's SEC periodic reports and filings. We undertake no obligation to update our forward-looking statements, whether as a result of new information, future events or otherwise.