Mitel's DataNet division designs, distributes, and supports an integrated, comprehensive solution for their customers' complex data and telecommunications needs. The complete integration and validation of the LAN, WAN infrastructure, along with the implementation of state-of-the-art security technologies, allows Mitel to provide the right environment for successful VoIP implementations.

All PowerDsine products -- ranging from single-port to 48-port midspans -- are offered through the Mitel DataNet division, including the new high power PD9000G family that supports IEEE802.3at devices and uniquely can provide mutual midspan backup.

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"By forming this relationship with Microsemi, Mitel now has the option to power our IP Phones and partner WLAN access points and cameras with PowerDsine midspans, the most advanced and manageable power injectors in the market," said Ryan Donovan, Mitel DataNet National Sales Director. "PowerDsine PoE midspans from Microsemi are the optimal solution for customers seeking to deploy VoIP when they have sufficient switch hardware, but lack PoE capability. With PowerDsine midspans our overall system can have smart on-demand power availability, with secure manageability and IPv6 compatibility."

All PowerDsine products -- ranging from single-port to 48-port midspans -- are offered through the Mitel DataNet division, including the new high power PD9000G family that supports IEEE802.3at devices and uniquely can provide mutual midspan backup.

"The new Mitel DataNet agreement leverages all the features available in the PowerDsine product line, allowing Mitel customers to migrate to VoIP while upgrading their underlying infrastructure to include power over Ethernet -- but without having to replace their existing Ethernet switches," said Sani Ronen, Product Marketing Manager for PowerDsine products at Microsemi.

About Mitel

Mitel delivers flexibility and simplicity in smart unified communications solutions and applications for organizations of all sizes. Mitel is reinventing how successful organizations gain competitive advantage by easily collaborating and communicating over distance and time with customers, colleagues and partners. Mitel's (www.mitel.com) EMEA headquarters are in Caldicot, UK. Global headquarters are in Ottawa, Canada, with offices, partners, and resellers worldwide.

About Microsemi

Microsemi Corporation, with corporate headquarters in Irvine, California, is a leading designer, manufacturer and marketer of high performance analog and mixed-signal integrated circuits and high reliability semiconductors. The company's semiconductors manage and control or regulate power, protect against transient voltage spikes and transmit, receive and amplify signals.

Microsemi's products include individual components as well as integrated circuit solutions that enhance customer designs by improving performance and reliability, battery optimization, reducing size or protecting circuits. The principal markets the company serves include implanted medical, defense/aerospace and satellite, notebook computers, monitors and LCD TVs, automotive and mobile connectivity applications. More information may be obtained by contacting the company directly or by visiting its website at http://www.microsemi.com.

The Microsemi Corporation logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=1233

"Safe Harbor" Statement under the Private Securities Litigation Reform Act of 1995: Any statements set forth in this news release that are not entirely historical and factual in nature, including without limitation statements concerning Mitel Networks agreement to add the full line of PowerDsine(R) midspan products from Microsemi as exclusive power over Ethernet (PoE) solutions for Mitel DataNet's comprehensive product portfolio, are forward-looking statements. These forward-looking statements are based on our current expectations and are inherently subject to risks and uncertainties that could cause actual results to differ materially from those expressed in the forward-looking statements. The potential risks and uncertainties include, but are not limited to, such factors as rapidly changing technology and product obsolescence, potential cost increases, variations in customer order preferences, weakness or competitive pricing environment of the marketplace, uncertain demand for and acceptance of the company's products, adverse circumstances in any of our end markets, results of in-process or planned development or marketing and promotional campaigns, difficulties foreseeing future demand, potential non-realization of expected orders or non-realization of backlog, product returns, product liability, and other potential unexpected business and economic conditions or adverse changes in current or expected industry conditions, difficulties and costs of protecting patents and other proprietary rights, inventory obsolescence and difficulties regarding customer qualification of products. In addition to these factors and any other factors mentioned elsewhere in this news release, the reader should refer as well to the factors, uncertainties or risks identified in the company's most recent Form 10-K and all subsequent Form 10-Q reports filed by Microsemi with the SEC. Additional risk factors may be identified from time to time in Microsemi's future filings. The forward-looking statements included in this release speak only as of the date hereof, and Microsemi does not undertake any obligation to update these forward-looking statements to reflect subsequent events or circumstances.

This news release was distributed by GlobeNewswire, www.globenewswire.com

SOURCE: Microsemi Corporation

CONTACT:  Microsemi Corporation
Financial Contact:
John Hohener, Vice President and CFO
(949) 221-7100
Editorial Contact:
Cliff Silver, Corporate Communications Manager
(949) 221-7100

The PowerDsine PD9000 system is the industry's first high-power gigabit-class PoE midspan that fully supports IEEE 802.3at specifications. It simultaneously delivers a variety of system efficiency and backup features, along with smart, enterprise-class network power-management capabilities. The PD-9000G family provides up to 36 watts of power per port (even on all 24 ports simultaneously) over standard Cat 5 cabling. This more than doubles the power that could be delivered using previous PoE standards, making it possible to power a much broader range of terminals including WiMAX transmitters, 802.11n access points, Pan-Tilt-Zoom (PTZ) and dome network cameras, and thin clients.

"Microsemi is committed to delivering key new advances in PoE products and technology, and this also requires that we continue to contribute to and acknowledge the important work of the IEEE and other PoE industry standards development bodies," said Sani Ronen, Marketing Manager for Microsemi's PoE Midspan Products. "Our ground-breaking PD9000G midspan showcases the PoE industry's latest technological achievements, and we are very proud that it has been recognized with a 2009 TMC Labs Innovation Award."

About Power over Ethernet Technology

PoE is a technology for wired Ethernet, the most widely installed local area network technology in use today. PoE allows the electrical power necessary for the operation of each end-device to be carried by data cables, rather than by separate power cords. It minimizes the number of wires used to install the network, resulting in lower cost, less downtime, easier maintenance and greater installation flexibility. The technology was pioneered by PowerDsine, a founding member of the IEEE 802.3af Task Force. The company was acquired by Microsemi Corporation in January 2007 and is now part of Microsemi's Analog Mixed Signal Group. More information may be obtained by contacting the company directly or by visiting the PowerDsine products website at http://www.microsemi.com/powerdsine/.

About Microsemi

Microsemi Corporation, with corporate headquarters in Irvine, California, is a leading designer, manufacturer and marketer of high performance analog and mixed-signal integrated circuits and high reliability semiconductors. The company's semiconductors manage and control or regulate power, protect against transient voltage spikes and transmit, receive and amplify signals.

Microsemi's products include individual components as well as integrated circuit solutions that enhance customer designs by improving performance and reliability, battery optimization, reducing size or protecting circuits. The principal markets the company serves include implanted medical, defense/aerospace and satellite, notebook computers, monitors and LCD TVs, automotive and mobile connectivity applications. More information may be obtained by contacting the company directly or by visiting its website at http://www.microsemi.com.

The Microsemi Corporation logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=1233

"Safe Harbor" Statement under the Private Securities Litigation Reform Act of 1995: Any statements set forth in this news release that are not entirely historical and factual in nature, including without limitation statements concerning our PowerDsine(R) PD-9000 power over Ethernet midspan being named a TMC(TM) Labs Innovation Award winner for 2009 by Technology Marketing Corporation's Internet Telephony Magazine, are forward-looking statements. These forward-looking statements are based on our current expectations and are inherently subject to risks and uncertainties that could cause actual results to differ materially from those expressed in the forward-looking statements. The potential risks and uncertainties include, but are not limited to, such factors as rapidly changing technology and product obsolescence, potential cost increases, variations in customer order preferences, weakness or competitive pricing environment of the marketplace, uncertain demand for and acceptance of the company's products, adverse circumstances in any of our end markets, results of in-process or planned development or marketing and promotional campaigns, difficulties foreseeing future demand, potential non-realization of expected orders or non-realization of backlog, product returns, product liability, and other potential unexpected business and economic conditions or adverse changes in current or expected industry conditions, difficulties and costs of protecting patents and other proprietary rights, inventory obsolescence and difficulties regarding customer qualification of products. In addition to these factors and any other factors mentioned elsewhere in this news release, the reader should refer as well to the factors, uncertainties or risks identified in the company's most recent Form 10-K and all subsequent Form 10-Q reports filed by Microsemi with the SEC. Additional risk factors may be identified from time to time in Microsemi's future filings. The forward-looking statements included in this release speak only as of the date hereof, and Microsemi does not undertake any obligation to update these forward-looking statements to reflect subsequent events or circumstances.

This news release was distributed by GlobeNewswire, www.globenewswire.com

SOURCE: Microsemi Corporation

CONTACT: Microsemi Corporation
Financial Contact:
John Hohener, Vice President and CFO
(949) 221-7100
Editorial Contact:
Cliff Silver, Corporate Communications Manager
(949) 221-7100