Press Release

SUNNYVALE, Calif.--(BUSINESS WIRE)--March 10, 2008--Harmonic Inc. (NASDAQ:HLIT) today announced that its Rhozet(R) Carbon Coder(TM) video transcoding solution has been deployed by leading broadband video management and publishing provider, thePlatform. A subsidiary of Comcast, thePlatform is using Carbon Coder in its new mpsManage Transcoding Service. Carbon Coder was selected by thePlatform due to its broad format support, including strong support for Web and mobile formats, as well as its excellent reputation among thePlatform's existing client base.

Leading media companies and video websites -- such as BBC, CNBC, CBS's College Sports TV, Gannett, Helio, HIT Entertainment, Sony BMG, and Verizon Wireless -- currently use thePlatform's media publishing system. The mpsManage Transcoding Service is a hosted solution that offers two transcoding options that utilize Rhozet Carbon Coder -- a shared service for customers using thePlatform's system who have low to medium volumes and general transcoding requirements, or dedicated servers for customers who have higher volumes or custom transcoding requirements.

"We believe that a complete broadband video management and publishing solution should combine the best technologies to meet our customers' business needs," said Marty Roberts, Vice President of Marketing at thePlatform. "By providing comprehensive format support, including the latest mobile formats, a cost-effective price, and a software development kit that is easily integrated into our end-to-end solutions model, the Rhozet Carbon Coder technology meets all of the criteria for our new mpsManage Transcoding Service."

"For thePlatform to meet the demands of its growing business, especially its mobile business, they need a solution that supports a wide array of formats, delivers high quality output, and offers outstanding value," said David Trescot, Vice President of the Rhozet Business Unit at Harmonic Inc. "Carbon Coder is able to deliver these capabilities and more -- giving thePlatform a competitive edge in their expanding market."

Harmonic's Rhozet Carbon Coder is a universal transcoding application that facilitates the transfer of media between a variety of platforms, including acquisition, editing, playout, archive, the Internet and mobile devices. Carbon Coder can run as a stand-alone application or as part of a multi-node, fully-automated rendering farm. Carbon Coder provides high-performance, scalable and cost-effective transcoding for a broad range of business environments, from specialized studios to enterprise-scale installations.

About thePlatform

thePlatform(TM), a subsidiary of Comcast, is the leading broadband video management and publishing company. Media companies and video sites rely on thePlatform's services to manage their media, generate revenue from their content, syndicate media to outlets, and create unique broadband video players. Hundreds of media companies use thePlatform to manage billions of videos every year. Customers include BBC, CNBC, CBS's College Sports TV, Comcast, Corus Entertainment, Gannett, Helio, HIT Entertainment, PBS KIDS Sprout, Sony BMG, The Hearst Corporation, Verizon Wireless, Vongo, and numerous others. For more information visit www.theplatform.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.

Rhozet, a business unit of Harmonic Inc., is dedicated to providing accelerated high-quality media transcoding solutions. The Rhozet solutions are offered in both off-the-shelf and customized software configurations for the production and content delivery markets. For more information about Rhozet technology please visit www.rhozet.com.

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 contains 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: the demands of thePlatform's growing business, and thePlatform's expanding market.

Our expectations and beliefs regarding our video transcoding solution and its anticipated benefits for thePlatform 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.

    CONTACT: Harmonic Inc.
             Sarah Lum, +1-408-543-2392 (Media Relations)
             sarah.lum@harmonicinc.com
             or
             StreetConnect for Harmonic
             Michael Newman, +1-408-542-2760 (Investor Relations)
             hlit@stct.com
             or
             for Rhozet Business Unit
             Sarah Kavanagh, +1-650-726-3482 (Media Relations)
             sarah@kavanaghpr.com

    SOURCE: Harmonic Inc.