Synchronous Ethernet Devices Lower Carrier Costs

Forecasting lower carrier costs, additions to the company’s synchronous Ethernet portfolio include single-chip solutions that allow manufacturers to easily upgrade or design networking equipment to support synchronous Ethernet. The ZL30143 and ZL30142 devices integrate analog and digital PLLs for central timing card applications. The ZL30143 provides two digital PLLs for applications that require independent transmit and receive timing paths while the ZL30142 device uses a single digital PLL for clock- and/or frame-pulse synchronization. Both devices require an inexpensive TCXO to achieve full compliance with ITU-T Recommendation G.8262. The ZL30146 chip incorporates two independently configurable digital PLLs for PDH/SONET/SDH and Ethernet cards requiring both transmit and receive paths. The ZL30145 provides one digital PLL for clock synchronization and delivers rate conversion- and jitter-attenuation-compliant performance for synchronous Ethernet, SDH, and SONET apps. ZARLINK SEMICONDUCTOR, Ottawa, Canada. (613) 592-0200.