Press Release 2001 -NetTest's PNNI interEMULATOR Now Integrates with OPNET Software

NetTest's PNNI interEMULATOR Now Integrates with OPNET Software

TORONTO, Canada - June 18, 2001 - NetTest (GN Nettest), a leading worldwide provider of testing, monitoring and management solutions for advanced and converged networks, today announced its newest release of the PNNI interEMULATOR™ Network Emulation System. Release 5.0 of the PNNI interEMULATOR contains several new features, including support for Solaris 8.0 and a new Tcl command line interface. In addition, R5.0 of the PNNI interEMULATOR can now import scenarios from OPNET products, allowing users to do more sophisticated analyses.

Earlier this year NetTest and OPNET Technologies Inc., the leading provider of intelligent network management software, announced plans to deliver integrated PNNI and MPLS software solutions for planning and testing advanced networking technologies. As a result of their collaboration, NetTest's PNNI interEMULATOR now has the added ability to import network topology and parametric information directly from the OPNET environment. This integration of network planning and real-time testing functions eliminates labor intensive network modeling data entry, while ensuring rapid network deployment of complex PNNI networks.

"What we've done is taken two best-of-breed products and integrated them, thereby providing the customer with a very robust solution set," says Alvin Francis, senior product manager at NetTest. "OPNET's software is second to none when it comes to the design and analysis of networks, network equipment, and communications protocols. NetTest's PNNI interEMULATOR strengths lie in its ability to conduct real-time testing and analysis of complex network topologies. Essentially, the customer wins with the integration of these products."

Todd Kaloudis, vice president of marketing at OPNET added, "The new PNNI interEMULATOR software leverages OPNET's virtual network environment to produce live protocol traffic for testing PNNI-enabled ATM switches in highly realistic scenarios. This is great news for service providers seeking to increase the efficiency and reliability of their ATM networks with more sophisticated routing and traffic engineering."

NetTest will be unveiling the OPNET integration and other new features of PNNI interEMULATOR R5.0 at Broadband Year 2001 Conference and Tradeshow, June 18-22, San Jose, California. Additional information is also available via the web at www.nettest.com/pnni

About OPNET Technologies Inc.

Founded in 1986, OPNET Technologies, Inc. is the leading provider of intelligent network management software. The OPNET product suite combines predictive modeling and a comprehensive understanding of networking technologies to enable its customers to more effectively design and deploy networks, provision services, diagnose network and application performance problems, and predict the impact of network changes. For more information about OPNET and its products, visit www.opnet.com.

About NetTest

NetTest (formerly GN Nettest) is a leading worldwide provider of testing, monitoring and management systems across both the optical and network layers of communications networks. NetTest provides network operators, network equipment manufacturers, component manufacturers and enterprise service providers with the network testing solutions they need. These solutions troubleshoot and optimize performance in today's most complex and hybrid networks, as well as those planned for tomorrow. NetTest is represented through business centers in Denmark, USA, Canada and France and through sales subsidiaries and distributors all over the world. NetTest's products are sold in over 70 countries. NetTest has a staff worldwide of approximately 1,500. NetTest (www.nettest.com) is a wholly owned subsidiary of GN Great Nordic, a multi-billion dollar Danish communications company and one of Scandinavia's leading industrial companies.

Safe Harbour Statement
The statements contained in this press release that are not purely historical are forward-looking statements within the meaning the Private Securities Litigation Reform Act of 1995, as amended, including statements regarding OPNET Technologies Inc.'s expectations, beliefs, intentions, or strategies regarding the future. All forward-looking statements included in this document are based upon information available to OPNET Technologies, Inc. as of the date hereof; OPNET Technologies, Inc. assumes no obligation to update any such forward-looking statements. Forward-looking statements involve risks and uncertainties, which could cause actual results to differ materially from those projected. For a discussion of such risks and uncertainties, see the Company's reports filed with the Securities & Exchange Commission, including its 10-Q for the quarter ended December 31, 2000.

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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 2001	NetTest's PNNI interEMULATOR Now Integrates with OPNET Software TORONTO, Canada - June 18, 2001 - NetTest (GN Nettest), a leading worldwide provider of testing, monitoring and management solutions for advanced and converged networks, today announced its newest release of the PNNI interEMULATOR™ Network Emulation System. Release 5.0 of the PNNI interEMULATOR contains several new features, including support for Solaris 8.0 and a new Tcl command line interface. In addition, R5.0 of the PNNI interEMULATOR can now import scenarios from OPNET products, allowing users to do more sophisticated analyses. Earlier this year NetTest and OPNET Technologies Inc., the leading provider of intelligent network management software, announced plans to deliver integrated PNNI and MPLS software solutions for planning and testing advanced networking technologies. As a result of their collaboration, NetTest's PNNI interEMULATOR now has the added ability to import network topology and parametric information directly from the OPNET environment. This integration of network planning and real-time testing functions eliminates labor intensive network modeling data entry, while ensuring rapid network deployment of complex PNNI networks. "What we've done is taken two best-of-breed products and integrated them, thereby providing the customer with a very robust solution set," says Alvin Francis, senior product manager at NetTest. "OPNET's software is second to none when it comes to the design and analysis of networks, network equipment, and communications protocols. NetTest's PNNI interEMULATOR strengths lie in its ability to conduct real-time testing and analysis of complex network topologies. Essentially, the customer wins with the integration of these products." Todd Kaloudis, vice president of marketing at OPNET added, "The new PNNI interEMULATOR software leverages OPNET's virtual network environment to produce live protocol traffic for testing PNNI-enabled ATM switches in highly realistic scenarios. This is great news for service providers seeking to increase the efficiency and reliability of their ATM networks with more sophisticated routing and traffic engineering." NetTest will be unveiling the OPNET integration and other new features of PNNI interEMULATOR R5.0 at Broadband Year 2001 Conference and Tradeshow, June 18-22, San Jose, California. Additional information is also available via the web at www.nettest.com/pnni About OPNET Technologies Inc. Founded in 1986, OPNET Technologies, Inc. is the leading provider of intelligent network management software. The OPNET product suite combines predictive modeling and a comprehensive understanding of networking technologies to enable its customers to more effectively design and deploy networks, provision services, diagnose network and application performance problems, and predict the impact of network changes. For more information about OPNET and its products, visit www.opnet.com. About NetTest NetTest (formerly GN Nettest) is a leading worldwide provider of testing, monitoring and management systems across both the optical and network layers of communications networks. NetTest provides network operators, network equipment manufacturers, component manufacturers and enterprise service providers with the network testing solutions they need. These solutions troubleshoot and optimize performance in today's most complex and hybrid networks, as well as those planned for tomorrow. NetTest is represented through business centers in Denmark, USA, Canada and France and through sales subsidiaries and distributors all over the world. NetTest's products are sold in over 70 countries. NetTest has a staff worldwide of approximately 1,500. NetTest (www.nettest.com) is a wholly owned subsidiary of GN Great Nordic, a multi-billion dollar Danish communications company and one of Scandinavia's leading industrial companies. Safe Harbour Statement The statements contained in this press release that are not purely historical are forward-looking statements within the meaning the Private Securities Litigation Reform Act of 1995, as amended, including statements regarding OPNET Technologies Inc.'s expectations, beliefs, intentions, or strategies regarding the future. All forward-looking statements included in this document are based upon information available to OPNET Technologies, Inc. as of the date hereof; OPNET Technologies, Inc. assumes no obligation to update any such forward-looking statements. Forward-looking statements involve risks and uncertainties, which could cause actual results to differ materially from those projected. For a discussion of such risks and uncertainties, see the Company's reports filed with the Securities & Exchange Commission, including its 10-Q for the quarter ended December 31, 2000. ### 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