Press Release

    - Powerful, High Quality Solutions for Real-Time and On-Demand
  Video Delivered to TV, PC and Mobile Devices on Display at Leading
                           European Event -

SUNNYVALE, Calif.--(BUSINESS WIRE)--Aug. 28, 2008--At IBC 2008 stand #1.C61, Harmonic Inc. (NASDAQ:HLIT) will showcase its market-leading and highly innovative portfolio of solutions that enable service providers to deliver ultra-high quality broadcast and on-demand video to multiple screens, including high definition (HD) television sets, PCs and mobile devices. Harmonic's comprehensive range of solutions includes video stream processing, edge and access systems, and software for the video delivery chain, from content creation and ingest to distribution and delivery. Taking place in Amsterdam from September 12-16, IBC is the leading television industry event in Europe, attended by broadcast, cable, satellite, telco and other service providers from around the world.

"The demand for video -- including broadcast and on-demand TV programming, over-the-top and user-generated content -- continues to grow at a fast pace, and consumers are seeking to be able to view more content on more devices. Harmonic is focused on developing best-in-class solutions that flexibly meet our customers' video delivery requirements for today and the future, and at IBC we will introduce new products and feature a wide range of solutions that enable a more personalized, converged video experience," said Tom Lattie, Director of Broadcast and New Media Solutions for Harmonic Inc.

    Featured demonstrations will include:

    --  Comprehensive solutions for creation and delivery of high
        quality real-time and on-demand video to a variety of devices
        (TV, PC, personal media players, cars, and mobile phones)

    --  Full frame rate 1080p MPEG-4 AVC (H.264) high definition
        encoding (50 frames per second)

    --  Distributed statistical multiplexing featuring mixed codec
        pools of SD/HD channels in various resolutions

    --  Content creation, distribution and delivery for on-demand
        services

    --  A universal edgeQAM solution for VOD, modular cable modem
        termination systems (M-CMTS), IP cable, switched digital video
        (SDV), broadcast and edge encryption applications

    --  Fiber-deep HFC transport and RF over glass (RFOG) solutions

    --  MPEG-4 AVC and MPEG-2 advertisement insertion

Harmonic's Rhozet(TM) universal transcoding solutions will be on display at stand #7.J11 as well as at the main Harmonic booth.

Industry experts from Harmonic have been selected to speak at technical conferences on Thursday, September 11. Patrick Waddell, Manager of Standards and Regulatory, will share his expertise on "Quality Issues in IPTV" during a session in association with IEEE BTS at 9:30 AM. David Price, Vice President of Business Development and Marketing Communications, will participate in the MPEG Industry Forum Master Class; he will moderate a session titled "Show Me the Money" at 10:50 AM and then participate on a panel session at 4:50 PM.

In addition, a Harmonic customer has been selected as a finalist for an IBC Innovation Award. Multimedia Polska, a leading service provider in Poland, has been honored for that country's first commercially available cable/IPTV VOD service, powered by Harmonic. With 20 years of experience in developing high performance video technology solutions, Harmonic continues to be the preferred provider for the world's largest and most innovative video service operators.

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 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: showcasing Harmonic's market-leading and highly innovative portfolio of solutions, the demand for video continuing to grow at a fast pace, and the introduction of new products and solutions that enable a more personalized, converged video experience.

Our expectations and beliefs regarding these matters and the anticipated benefits of the products and solutions to be featured at IBC 2008 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
             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

    SOURCE: Harmonic Inc.