Symmetricom and BigBand Networks Demonstrate DOCSIS(R) Timing Interface Interoperability for Modular CMTS; Solution Enables Delivery of Video, Voice and Data Through More Efficient and Scalable Architecture.

SAN JOSE, Calif. -- Symmetricom, Inc. (NASDAQ:SYMM), a worldwide leader in precise time and frequency products and services, and BigBand Networks, Inc., a leading provider of broadband multimedia infrastructure for video, voice and data, today announced a successful vendor interoperability demonstration of the DOCSIS(R) Timing Interface (DTI) specification within the CableLabs(R) new Modular Cable Modem Termination System (M-CMTS) specification. The M-CMTS solution is designed to allow operators to economically expand access bandwidth and facilitate the convergence of video, voice and data over their plants. This industry milestone was achieved at the CableLabs Summer Conference event in Keystone, Colorado and IBC 2005 in Amsterdam, Netherlands.

Modular CMTS is an approach to evolving legacy integrated CMTS architectures achieved by decoupling the functionality to be performed on specialized platforms that are connected by standard interfaces. The configuration achieved by BigBand Networks and Symmetricom is designed to enable migration from legacy integrated CMTS deployments by utilizing field-deployed platforms, with improvements in port density and capacity expenses. By physically separating upstream and downstream resources, the M-CMTS solution breaks the paradigm of fixed capacity ratios for more customizable deployments. Cable operators could leverage this for increasing bandwidth of services to today's field-deployed DOCSIS cable modems, and emerging cable modems capable of channel bonding.

The M-CMTS specification requires precise time and frequency alignment for conformance to the CableLabs specification. This was accomplished by integrating the BigBand Cuda(R) CMTS and BigBand BME(TM) (Broadband Multimedia-Service Edge) with Symmetricom's precise timing technology, producing the Modular CMTS demonstration consisting of commercially available platforms and compatible with commercially available cable modems.

"Utilizing Symmetricom's DTI client reference design provided us with a low risk and fast time to market approach for our Modular CMTS solution," said John Connelly, executive vice president of marketing and business development of BigBand Networks. "We believe the modular approach will prove to be the path chosen by operators that want to leverage their existing infrastructure to gain bandwidth efficiencies, while also leaving themselves the flexibility to adapt to future innovations such as channel bonding and dynamic allocation of bandwidth."

"Symmetricom's DTI client reference design is the first embedded time and frequency solution available in the market, and we are excited about our partnerships with industry innovators such as BigBand Networks," said Gurdip Jande, senior vice president of marketing at Symmetricom.

For more information on the M-CMTS solution please visit http://www.symmetricom.com/cable or http://www.bigbandnet.com.

About BigBand Networks

BigBand Networks, Inc. is a leading provider of broadband multimedia infrastructure for video, voice and data. Utilizing unique combinations of open technologies, BigBand solutions process, optimize, and deliver services such as high-speed data, VoIP, digital broadcast television, HDTV, transport of high quality video, local advertising, VOD, interactive TV and IPTV through any network. This means service providers can now cost-effectively expand revenue-generating offerings of rich content and advanced interactive services. Customers include seven of the ten largest North American cable operators, US telecommunications companies, as well as leading service providers in Asia, Europe and Latin America. Founded in 1999, BigBand Networks is based in Redwood City, Calif. with offices worldwide. For more information, please call 650-995-5000, email [e-mail] or visit www.bigbandnet.com.

About Symmetricom, Inc.

As a worldwide leader in precise time and frequency products and services, Symmetricom provides "Perfect Timing" to customers around the world, including communication service providers, network equipment manufacturers, U.S. Department of Defense (DOD), aerospace contractors, enterprises, governments and research facilities. Since 1985, the company's timing, frequency and synchronization solutions have helped define the world's standards, delivering precision, reliability and efficiency to wireless and wireline networks, instrumentation and testing applications and network time management. Deployed in more than 90 countries, products include atomic clocks, cesium and rubidium standards, VME, crystal oscillators, PCI cards and Global Positioning System (GPS) solutions for instrumentation applications, as well as network timeservers for Network Time Protocol (NTP) synchronization and time synchronization solutions. In 2002, Symmetricom acquired TrueTime and Datum, enhancing its position in the world time and frequency markets. Symmetricom is based in San Jose, Calif., with offices worldwide. For more information, visit www.symmetricom.com.

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An equipment demonstration at a CableLabs' event does not constitute CableLabs' endorsement of that equipment.