Press Release

    DiviCom(R) Electra(TM) 7000 Receives Top Rating; Six Harmonic
   Products Acknowledged as Category Leaders by Panel of Judges from
                        Leading Cable Operators

SUNNYVALE, Calif.--(BUSINESS WIRE)--June 19, 2007--Harmonic Inc. (NASDAQ: HLIT) today announced that six of its products have been honored for superior technical innovation and market leadership in Broadband Gear Report's (BGR) 2007 Diamond Technology Reviews. The DiviCom(R) Electra(TM) 7000 high definition (HD) MPEG-4 AVC (H.264) encoder received a perfect score of five diamonds, and is the first product from any industry vendor to receive this top rating since the introduction of the Diamond Technology Reviews in 2005. In addition, four Harmonic products were rated as outstanding solutions with a score of four diamonds: the Electra 5400 standard definition (SD) H.264 encoder, NSG(TM) 9000 universal edgeQAM, ProStream(TM) 1000 stream processing platform, and ProStream 2000 H.264 splicer. The Armada(R) intelligent asset manager, used to efficiently distribute on-demand assets, earned a score of three diamonds.

Judged by a panel of senior engineering executives at leading North American cable operators Bright House Networks, Charter Communications, Comcast Corporation, Cox Communications and Rogers Communications, BGR's Diamond Technology Reviews program is designed to provide an objective annual technology and product review for the broadband community.

"Our judges were extremely frank in their evaluations of all products entered, so the perfect five diamond review rating that the DiviCom Electra 7000 encoder received is very notable -- especially since it marks 'a first' in the history of the Diamond Technology Reviews," Laura Hamilton, editor-in-chief at BGR, said. "The judging panel was particularly impressed by the encoder's cutting-edge H.264 capabilities for HD streams so that more HD video can be moved in tight bandwidth networks."

"Harmonic's ongoing innovation and leadership in compression, edge, on-demand and access solutions for the cable market has been proven by our success as the solution provider of choice for many years at top tier MSOs in North America and around the world," said Nimrod Ben-Natan, Vice President of Product Marketing and Strategy for Harmonic Inc. "The BGR Diamond Technology Reviews are a further industry confirmation of the strength of Harmonic's product line, and the innovative new products introduced in 2006. The addition of our latest generation NSG edgeQAM, the Electra H.264 encoders for HD and SD, the versatile ProStream 1000 video stream processing platform, ProStream 2000 H.264 splicer and Armada software has created a more complete video delivery solution for our customers. Harmonic is truly revolutionizing the video experience by enabling operators to deliver a better performing, higher quality and more advanced service offering to the viewer."

Harmonic's extensive range of digital video, edge and broadband access solutions offer service providers superior picture quality and bandwidth efficiency for next-generation broadcast and on-demand services. The industry-leading Electra HD and SD H.264 encoders have been selected by leading satellite, telco, cable and broadcast customers around the world since their introduction in the second half of 2006. The NSG 9000 edgeQAM scales to support up to 72 QAM channels in a compact two rack-unit platform that is DOCSIS 3.0 ready, while the ProStream family of products delivers the utmost in flexibility for a wide range of stream processing needs.

About Broadband Gear Report

Broadband Gear Report (www.broadbandgear.net) was launched in 2004 by Hermes Media & Research and has become the leading online product and deployment alert service for broadband engineering professionals. The Diamond Technology Reviews were launched in 2005 to answer the need for an unbiased technology review program within the broadband community. Laura Hamilton, BGR's VP and Editor-in-Chief, has over 20 years experience covering the broadband technology industry.

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: ongoing innovation and leadership and truly revolutionizing the video experience.

Our expectations and beliefs regarding these matters 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: Media Relations for Harmonic
             Sarah Lum, 408-543-2392
             sarah.lum@harmonicinc.com
             or
             Investor Relations for Harmonic
             StreetConnect
             Michael Newman, 408-542-2760
             hlit@stct.com

    SOURCE: Harmonic Inc.