External clock input & RF Synthesizer
The clock system is critical for digital circuits, and network switches are no exception. It can be likened to a series of high-speed switches that must operate with extreme precision. Inside the SS-1 Pro, this system consists of a femtosecond clock and a high-precision ultralow phase noise RF synthesizer. The SS-1 Pro supports two clock modes: In internal clock mode, the internal femtosecond clock serves as a reference for the RF synthesizer, which then generates a highly stable, low-phase-noise clock signal for the main controller. In external clock mode, the 10MHz clock signal from an external clock acts as the reference for the RF synthesizer. The DPLL then outputs a synchronized, highly stable, low-phase-noise clock signal to the main controller. Even though the SS-1 has a simplified clock system design and does not have a RF synthesizer, it still features an ultra-low phase noise femtosecond clock as the reference for the main controller, ensuring exceptional performance.