Symmetricom Announces Digital Broadcasting Sync Source: High Performance DVB Sync Source Enables Highly Reliable Delivery of Video and Audio Content to the End User

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Symmetricom, Inc. (NASDAQ: SYMM), a worldwide leader in precise time and frequency technologies that accelerate the deployment and enable the management of next generation networks, today announced the 4370A DVB Sync Source, a high performance, flexible and highly reliable timing system designed for Single Frequency Network (SFN) synchronization for Digital Video Broadcasting (DVB) and Digital Audio Broadcasting (DAB) applications. DVB/DAB require a precision time and frequency reference to synchronize transmitters across multiple locations. Without synchronization, networks are not able to reliably deliver video and audio content to the end user.

The main concern of our broadcast customers is maintaining the reliability of their networks

    "Symmetricom now offers broadcasters deploying Single Frequency Networks for digital terrestrial and mobile video networks the necessary reliability and Quality of Service (QoS), minimizing network downtime," commented Doug Lowrie, product marketing manager at Symmetricom. "The 4370A DVB Sync Source is a highly flexible, reliable time and frequency source supporting evolving network requirements for broadcasters."

The 4370A receives reference-timing signals from Global Positioning System (GPS), fiber optic and E1 inputs and translates them to generate the output signals. In case of GPS loss, the 4370A automatically switches to and locks to the auxiliary fiber optic or 2 MHz, 2Mbit/sec input to continually provide outputs that are traceable to a primary reference clock. The 4370A can also be linked together via an optional fiber optic transceiver on the input, providing a double redundant system with no signal point of failure allowing the utmost in system reliability. Redundancy is a key requirement because without GPS based sync, transmission is lost and QoS is degraded.

"The main concern of our broadcast customers is maintaining the reliability of their networks," commented Chris Roberts, European business development manager at Chronos Technology Ltd, a Symmetricom distributor operating in Sweden, Denmark and the United Kingdom. "Through its remote management, fiber distribution and hot swappable output modules, the DVB Sync Source offers redundancy features that are necessary to maintain a reliable broadcast network."

The 4370A DVB Sync Source provides many key features, supporting evolving network topologies and minimizing network downtime for broadcasters, including:

-- Redundant, Hot Swappable Design - Hot swappable power supplies and up to six (6) hot swap output modules providing 24 total outputs in a single 1U chassis; Option to configure two sync sources is available - one as primary and one as backup - for automatic switchover if the primary fails.

-- Remote Monitoring and Control - Remote configuration and monitoring using SNMP allows for network-wide visibility, monitoring alarms and diagnosing errors quickly, ensuring robust network operation.

-- High Precision, High Reliability - Robust DVB synchronization calls for key attributes in the SFN's timing reference. The DVB Sync Source addresses each of these attributes within the core architecture and option modules.

-- Low Phase Noise - The timing source utilized to generate a signal on a channel can contribute to noise on that channel which can interfere with clear reception. Low phase noise in the timing source reduces that likelihood.


The DVB Sync Source will be shipping in December.

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About Symmetricom, Inc.

As a worldwide leader in precise time and frequency products and services, Symmetricom provides "Perfect Timing" to customers around the world. Since 1985, the company's solutions have helped define the world's time and frequency standards, delivering precision, reliability and efficiency to wireline and wireless networks, instrumentation and testing applications and network time management. Deployed in more than 90 countries, the company's synchronization solutions include primary reference sources, building integrated timing supplies (BITS), GPS timing receivers, time and frequency distribution systems, network time servers and ruggedized oscillators. Symmetricom also incorporates technologies including Universal Timing Interface (UTI), Network Time Protocol (NTP), Precision Time Protocol (IEEE 1588), and others supporting the world's migration to Next Generation Networks (NGN). Symmetricom is based in San Jose, Calif., with offices worldwide. For more information, visit

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Raychel Marcotte
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