Harmonic's SUPRALink™ DWDM Transport Solution Selected to Enhance HFC Network in Salzburg, Austria

COLOGNE, Germany, ANGA Cable 2009 Stand H.21 — May 27, 2009 — Harmonic Inc. (NASDAQ: HLIT) today announced that its SUPRALink™ 1550 nm dense wave division multiplexing (DWDM) transport solution has been selected by the province of Salzburg, Austria, for an upgrade to its HFC cable infrastructure. The new deployment, the first of its kind in the region, will be implemented by Normann Engineering GmbH, a longstanding Harmonic partner and reseller in the region.

Salzburg is in the process of segmenting the HFC network to increase bandwidth to the home for DOCSIS® 3.0 data and video services. The high performance SUPRALink transmitters and amplifiers — which significantly increase reach and eliminate the need for additional fiber and active devices in the network — offer Salzburg a very cost-effective and reliable solution. The full-band 1550 nm directly modulated system is the industry's first to support up to eight wavelengths at a distance of up to 40 km with optical amplification, for up to 1 GHz of both digital and analog content per wavelength.

"Harmonic has been providing Salzburg with reliable and high quality HFC optics for well over a decade," said Reinhold Ratzinger, CEO for Telecommunications, Salzburg AG. "The exciting new SUPRALink 1550 nm DWDM system makes it possible to significantly increase bandwidth without laying new fiber. This saves us a substantial amount of time and money, in addition to being a technically superior solution."

"The distances involved and number of wavelengths needed for this upgrade required latest generation technology, since the limited reach of 1310 nm DWDM solutions posed technical challenges. Other solutions, such as externally modulated lasers or optical combining of broadcast and narrowcast signals, were operationally complex or cost prohibitive. The scalability and unique capabilities of Harmonic's SUPRALink solution provide Salzburg with a competitive advantage by enabling higher speed data services without a significant increase in capital expenditures," said Helmut Normann, CEO of Normann Engineering GmbH.

Harmonic's new SUPRALink technology enables cost-effective DWDM segmentation for the majority of installed HFC networks, and as a result significantly extends the capacity and longevity of existing HFC infrastructures.

"The SUPRALink solution is ideal for node segmentation, particularly in scenarios where operators have limited fiber availability. It utilizes advanced patent-pending technology to deliver up to a four-fold increase in fiber reach over 1310 nm DWDM or CWDM systems, overcoming limitations of alternative downstream solutions," said Nimrod Ben-Natan, vice president of product marketing, solutions and strategy for Harmonic Inc.

Harmonic's new SUPRALink family of solutions will be featured at the ANGA Cable 2009 exhibition, stand #H.21, in Cologne, Germany from May 26-28.

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About Salzburg AG

Salzburg AG, in the province of Salzburg, is the leading provider for energy, telecom as well as transportation. It is for the province the most important utility provider and is indispensable for the creation of the infrastructure of the whole region. Its activities include provision of electric power, gas, district heating, water transportation, CATV, Internet and telephony. Ingenuity, creativity and the know-how for transferring technological innovations into practical application is one of the main strengths of the company. Salzburg AG is headquartered in the city of Salzburg with many outposts all over the province of Salzburg. Visit http://www.salzburg-ag.at.

About Normann Engineering GmbH

Normann Engineering GmbH is a leading company for offering products and services for broadband and broadcasting. It has not only customers in Austria but also in neighboring countries such as Germany and most Eastern European countries. Normann Engineering is headquartered in Wels, Austria, with offices in Serbia and Slovakia. Visit http://www.normann-engineering.com.

About Harmonic Inc.

Harmonic Inc. is a leading provider of versatile and high performance video solutions that enable service providers to efficiently deliver the next generation of broadcast and on-demand services including high definition, video-on-demand, network personal video recording and time-shifted TV. Cable, satellite, broadcast and telecom service providers can increase revenues and lower operational expenditures by using Harmonic's digital video, broadband optical access and software solutions to offer consumers the compelling and personalized viewing experience that is driving the business models of the future.

Harmonic (NASDAQ: HLIT) is headquartered in Sunnyvale, California with R&D, sales and system integration centers worldwide. The Company's customers, including many of the world's largest communications providers, deliver services in virtually every country. Visit www.harmonicinc.com for more information.

This press release may contain forward-looking statements within the meaning of Section 27(A) of the Securities Act of 1933 and Section 21(E) of the Securities Exchange Act of 1934, including statements related to: enhancing the HFC network in Salzburg, the implementation of the deployment by Normann Engineering, and extending the capacity and longevity of existing HFC infrastructures.

Our expectations and beliefs regarding the capabilities of Harmonic's SUPRALink™ 1550 nm dense wave division multiplexing (DWDM) transport solution and the anticipated benefits for the province of Salzburg may not materialize, and actual results could differ materially from those projected. The forward-looking statements contained in this press release are also subject to other risks and uncertainties, including those more fully described in Harmonic's filings with the Securities and Exchange Commission including its recent Reports filed on Form 10-K and Form 10-Q. Harmonic does not undertake to update any forward-looking statements.

EDITOR'S NOTE — Product and company names used herein are trademarks or registered trademarks of their respective owners.