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GbE line-card IC offers synchronization at the PHY

Posted: 08 Mar 2007 ?? ?Print Version ?Bookmark and Share

Keywords:GbE? Gigabit Ethernet? GbE device? GbE card? synchronous Ethernet?

ZL30107 GbE line-car synchronizer

Zarlink Semiconductor Inc. has beefed up its synchronous Ethernet timing product portfolio with a single-chip GbE line card synchronizer that allows service providers to deliver time-critical applications over packet-based networks in a cost-effective manner.

Next-gen networking
Priced at less than $10 each in high volumes, the ZL30107 chip provides timing and synchronization for Ethernet line cards in next-generation networking equipment supporting circuit services over IP-based architectures.

Integrating independent analog and digital PLLs, the device synchronizes with standard telecom and Ethernet clocks and generates an IEEE 802.3 jitter compliant 25MHz GbE output clock.

The ZL30107 device supports synchronous, holdover and asynchronous free-run modes of operation. In synchronous operation, the ZL30107 PLL replaces the free-running reference clock usually provided by an oscillator with a network timing reference. The device accepts three references and performs hitless reference switching.

The integrated DPLL automatically synchronizes to one of a pre-defined set of standard telecom frequencies ranging from 2kHz to 77.76MHz in addition to 25MHz. The chip generates a very low jitter 25MHz GbE output clock.

Holdover mode
When all references fail the device automatically enters holdover mode and continues to generate an output clock based on frequency data collected from past reference signals.

Zarlink and Marvell recently demonstrated synchronization over the Ethernet PHY using their respective PLL and Ethernet PHY technologies.

The ZL30107 chip is in volume production and offered in a 9-by-9mm, 64-pin CABGA package.

Pricing is less than $10 each in high volumes.

- Ismini Scouras

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