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Global Trading Firm Uses Visual Networks' WAN Service Management Solution to Monitor Mission-Critical Trading Network.

Business Editors/Hi-Tech Writers

ROCKVILLE, Md.--(BUSINESS WIRE)--Aug. 7, 2001

Visual UpTime Supports Internal Network and External Links to

Stock Exchanges for Susquehanna International Group, LLP

Visual Networks, Inc. (NASDAQ:VNWK), a leading provider of performance management solutions designed to drive performance and reliability into communication networks and services, announced today that Susquehanna International Group, LLP (SIG), a global trading and technology company headquartered in Bala Cynwyd, Pa., has deployed the Visual UpTime(R) Wide Area Network performance management solution to manage the mission-critical network that supports its worldwide trading operations.

In addition to supporting the company's internal corporate network and remote customer and vendor connections, Visual Networks'(R) Visual UpTime is used by SIG to monitor its frame relay and ATM circuits and links to the leading stock exchanges, including the NASDAQ, the New York Stock Exchange and the American Stock Exchange, as well as electronic communications-based exchanges, such as Instinet and Island.

"In today's increasingly global, virtual and around-the-clock trading environment, it is essential that we be able to monitor and troubleshoot potential network performance issues before they affect critical operations," said Hylton Socher, Chief Information Officer of Susquehanna International Group. "That is why we have deployed Visual UpTime across our entire wide area network - from remote international sites in Amsterdam and Dublin to remote domestic locations in New York, Chicago and San Francisco - all of which rely on our primary hub site to access critical market data."

Widely acknowledged as the industry's leading WAN service management solution and used by more than 2,500 companies, Visual UpTime integrates expert monitoring capabilities with access equipment to fully automate the collection, interpretation, and presentation of service level data.

A series of intuitive applications provide remote real-time troubleshooting, performance monitoring, service level validation, and performance reporting for frame relay, ATM, Internet and private line connections--or a combination of these technologies.

The only performance management solution with management capabilities for mixed ATM and frame relay environments, Visual UpTime provides in-depth traffic capture and protocol analysis across the entire wide area network.

"Visual UpTime enables us to monitor all the components of our internal network as well as critical connections and circuits to outside vendors and partners to ensure maximum network availability and performance," added Mr. Socher. "A large part of our business is providing liquidity between different markets across the country and around the world, and maximum network performance is crucial to maintaining continuous order flow and execution."

By continuously measuring second-by-second usage levels for every monitored port and PVC, Visual UpTime can automatically make informed recommendations on bandwidth allocation by specific location with its clear, detailed picture of circuit performance.

This enables network managers to create overview reports of the most and least utilized circuits across the network, then allocate bandwidth as appropriate--providing sufficient bandwidth to ensure mission-critical applications get through, without over-provisioning bandwidth and exceeding WAN budgets.

"SIG's utilization of Visual UpTime to support its ATM and frame relay network illustrates the importance of performance management in a mission-critical network and the unique value that only Visual Networks can provide by supporting ATM and hybrid frame relay and ATM networks," said Steve Hindman, executive vice president of sales and marketing for Visual Networks. "We are pleased to include them in the growing list of financial services companies that rely on Visual UpTime to maximize the performance of crucial network operations."

About Visual UpTime v6.0

Visual UpTime(R) v6.0, which was announced in July and will be available later this year, will provide improved performance management support for ATM services and strengthens its unique solution for troubleshooting and managing complex, mixed ATM and frame relay network environments -- all from a single system.

Enhancements to Visual UpTime include enhanced protocol visibility, new ATM SLA validation tools that monitor cell loss, round-trip delay and availability, and extended ATM performance monitoring, reporting and troubleshooting capabilities.

Visual UpTime v6.0 will also provide E3 ATM capabilities for managing international ATM circuits at line speeds up to 34Mbps within international or domestic based, multi-national ATM or frame relay-ATM networks.

About Susquehanna International Group, LLP

Susquehanna International Group, LLP is a premier options trading organization, acting as specialist/DPM/LMM in 600 equity option classes, including such names as Microsoft, America Online, IBM, and Intel.

In addition, the companies comprising SIG operate a range of diverse businesses in multiple markets including, a specialist/market maker in exchange-traded funds, the leading sector index options trading firm, a New York Stock Exchange specialist and introducing broker, a highly ranked NASDAQ market maker, extensive trading of international securities, a leading dealer in US municipal securities, and a leading developer of pricing, analytical, and execution technology.

SIG has evolved into a global organization active in the markets of over 20 countries on 5 continents, including offices in Philadelphia, Bala Cynwyd, New York, Chicago, San Francisco, Sydney, Amsterdam, and Dublin.

About Visual Networks, Inc.

Visual Networks has the broadest suite of proven performance management solutions for communications networks and services.

In addition to Visual UpTime(R), the award winning frame relay and ATM service management solution used by more than 2,500 enterprises and the world's leading service providers, the company's Visual IP InSight(TM) and Visual eWatcher(TM) services extend the company's reach to new, fast-growing technologies such as IP-VPNs, DSL, Wireless and Web-enabled services.

Predominantly deployed at the edge of the network-closest to the end-user-Visual Networks' products evaluate performance metrics and measure the service experience from the customer's perspective. Using Visual Networks' solutions, service providers and enterprise customers can increase network reliability, dramatically reduce operational expenses, and lower their total cost of ownership.

Visual Networks' customers include AT&T, Cable & Wireless, Merrill Lynch, Prodigy, SBC, Sprint, Verizon, and WorldCom. Established in 1993, Visual Networks' headquarters are located in Rockville, MD, with international offices in Europe, Asia, and Canada. For sales information in the U.S., call 1-800-240-4010 or visit www.visualnetworks.com.

Visual Networks and Visual UpTime are registered trademarks and Visual IP Insight and Visual eWatcher are trademarks of Visual Networks Technologies, Inc. Other slogans or names of actual companies, products or services may be trademarks or service marks of their respective owners.

The press release contains forward-looking information within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, and is subject to the safe harbor created by those sections. The forward-looking information is based upon current information and expectations regarding Visual Networks and its subsidiaries.

These estimates and statements speak only as of the date on which they are made, are not guarantees of future performance and involve certain risks, uncertainties and assumptions that are difficult to predict. Therefore, actual outcomes and results could materially differ from what is expressed, implied or forecasted in such forward-looking statements.

Visual Networks assumes no obligation to update the information contained in this press release.

Visual Networks' future results may be impacted by risks associated with rapid technological change and the emerging services market, potential fluctuations in quarterly operating results, its dependence upon sole and limited source suppliers and fluctuations in component pricing, its dependence upon key employees, and its ability to retain employees.

Visual Networks' future results may also be impacted by other risk factors listed from time to time in its SEC filings, including, but not limited to, the Company's Registration Statement on Form S-4, dated April 4, 2000, as amended, its Form 10-Qs and its Annual Report on Form 10-K.
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