Press Release 2000 - OPNET Technologies Moves Corporate Headquarters to Maryland

SBC Helps Businesses Predict Impact of Network Decisions With Virtual Build-And-Manage Modeling

SBC Enterprise Designer optimizes performance and reduces risk through automated network design, performance modeling and network simulation

SAN ANTONIO, June 28, 2000 -- SBC Communications Inc. (NYSE: SBC) today announced availability of automated design and performance modeling services for complex enterprise networks. With the introduction of SBC Enterprise Designer, a new network modeling tool, SBC can help businesses manage network service levels and reduce the risk of negative performance impacts from new application and technology deployments.

Enterprise Designer enables SBC to generate a comprehensive computer model of a customer's existing local- and wide-area enterprise networks in minutes, project the impact that new applications, technologies and traffic patterns will have on the network's performance, virtually deploy and test various solutions for maintaining desired service levels, and develop a schedule and budget for optimal network upgrades.

"Network performance is fundamental to business performance in today's enterprises," said J. Thomas McGrath, President SBC DataComm. "SBC Enterprise Designer is the most powerful tool available for helping businesses build and manage high-performance enterprise networks and guarantee service levels that support their business needs."

SBC Enterprise Designer integrates and customizes two industry-leading network modeling software solutions into a complete network mapping and scenario simulation tool that operates on an industry-standard laptop PC. The tool creates interactive network maps with click-through details on each network device and performance-level graphics illustrating impacts of network design and use variables.

SBC Enterprise Designer's network discovery, documentation and design capabilities are enabled through Netformx, Inc. software. The Netformx library of network devices supports the mapping of existing networks in minutes, including click-through configuration and option details on network devices from all major manufacturers. The software also supports design, validates interoperability of devices, and can instantly create an equipment bill of materials for a project.

IT DecisionGuru software from OPNET Technologies, Inc. supports SBC Enterprise Designer's modeling, simulation, traffic analysis and predictive capabilities. It creates graphic displays of projected service levels achieved though alternative courses of action in a virtual network environment. It also enables SBC to enhance customer network performance from its network operations centers after the solution has been deployed.

"SBC is the first network integration company to integrate and customize these industry leading solutions from Netformx and OPNET and make their combined modeling capabilities available to support enterprise customers," said McGrath. "We believe that SBC Enterprise Designer's design and simulation capabilities will give our customers the network performance edge that will help them succeed."

About SBC Communications, Inc.

SBC Communications Inc. (www.sbc.com) is a global communications leader. Through its subsidiaries' trusted brands - Southwestern Bell, Ameritech, Pacific Bell, SBC Telecom, Nevada Bell, SNET and Cellular One - and world-class network, SBC's subsidiaries provide local and long-distance phone service, wireless and data communications, paging, high-speed Internet access and messaging, cable and satellite television, security services and telecommunications equipment, as well as directory advertising and publishing. In the United States, the company currently has 94.1 million voice grade equivalent lines, 11.7 million wireless customers and is undertaking a national expansion program that will bring SBC service to an additional 30 markets. Internationally, SBC has telecommunications investments in 22 countries. With more than 208,000 employees, SBC is the 13th-largest employer in the U.S., with annual revenues that rank it among the largest Fortune 500 companies.

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Note to editors: The word OPNET is spelled with all upper-case letters.

OPNET Media Contact:
Margarita Castillo
OPNET Technologies, Inc.
(240) 497-3000
Media@opnet.com
www.opnet.com

OPNET Investor Relations:
Mel Wesley
OPNET Technologies
(240) 497-3000
ir@opnet.com
www.opnet.com

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Press Releases Archived Press Releases 2000	SBC Helps Businesses Predict Impact of Network Decisions With Virtual Build-And-Manage Modeling SBC Enterprise Designer optimizes performance and reduces risk through automated network design, performance modeling and network simulation SAN ANTONIO, June 28, 2000 -- SBC Communications Inc. (NYSE: SBC) today announced availability of automated design and performance modeling services for complex enterprise networks. With the introduction of SBC Enterprise Designer, a new network modeling tool, SBC can help businesses manage network service levels and reduce the risk of negative performance impacts from new application and technology deployments. Enterprise Designer enables SBC to generate a comprehensive computer model of a customer's existing local- and wide-area enterprise networks in minutes, project the impact that new applications, technologies and traffic patterns will have on the network's performance, virtually deploy and test various solutions for maintaining desired service levels, and develop a schedule and budget for optimal network upgrades. "Network performance is fundamental to business performance in today's enterprises," said J. Thomas McGrath, President SBC DataComm. "SBC Enterprise Designer is the most powerful tool available for helping businesses build and manage high-performance enterprise networks and guarantee service levels that support their business needs." SBC Enterprise Designer integrates and customizes two industry-leading network modeling software solutions into a complete network mapping and scenario simulation tool that operates on an industry-standard laptop PC. The tool creates interactive network maps with click-through details on each network device and performance-level graphics illustrating impacts of network design and use variables. SBC Enterprise Designer's network discovery, documentation and design capabilities are enabled through Netformx, Inc. software. The Netformx library of network devices supports the mapping of existing networks in minutes, including click-through configuration and option details on network devices from all major manufacturers. The software also supports design, validates interoperability of devices, and can instantly create an equipment bill of materials for a project. IT DecisionGuru software from OPNET Technologies, Inc. supports SBC Enterprise Designer's modeling, simulation, traffic analysis and predictive capabilities. It creates graphic displays of projected service levels achieved though alternative courses of action in a virtual network environment. It also enables SBC to enhance customer network performance from its network operations centers after the solution has been deployed. "SBC is the first network integration company to integrate and customize these industry leading solutions from Netformx and OPNET and make their combined modeling capabilities available to support enterprise customers," said McGrath. "We believe that SBC Enterprise Designer's design and simulation capabilities will give our customers the network performance edge that will help them succeed." About SBC Communications, Inc. SBC Communications Inc. (www.sbc.com) is a global communications leader. Through its subsidiaries' trusted brands - Southwestern Bell, Ameritech, Pacific Bell, SBC Telecom, Nevada Bell, SNET and Cellular One - and world-class network, SBC's subsidiaries provide local and long-distance phone service, wireless and data communications, paging, high-speed Internet access and messaging, cable and satellite television, security services and telecommunications equipment, as well as directory advertising and publishing. In the United States, the company currently has 94.1 million voice grade equivalent lines, 11.7 million wireless customers and is undertaking a national expansion program that will bring SBC service to an additional 30 markets. Internationally, SBC has telecommunications investments in 22 countries. With more than 208,000 employees, SBC is the 13th-largest employer in the U.S., with annual revenues that rank it among the largest Fortune 500 companies. ### Note to editors: The word OPNET is spelled with all upper-case letters. OPNET Media Contact: Margarita Castillo OPNET Technologies, Inc. (240) 497-3000 Media@opnet.com www.opnet.com OPNET Investor Relations: Mel Wesley OPNET Technologies (240) 497-3000 ir@opnet.com www.opnet.com

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