The ZL30146 OC-192/STM-64 PDH/SONET/SDH/Synchronous Ethernet Network Interface Synchronizer is a highly integrated device that provides timing for both PDH/SONET/SDH and Ethernet network interface cards. This device is ideally suited for designs that require both a transmit timing path (backplane to PHY) and a receive timing path (PHY to backplane). Each path is controlled with separate DPLLs (Tx DPLL, Rx DPLL) which are both independently configurable through the serial interface (SPI or I2C). Click here for secure documentation