Routing Engine clock interface: GPS input and output, 1/5/10 MHz frequency

This feature enables the Routing Engine external clock interface to receive and transmit GPS timing signals at 1 MHz, 5 MHz, or 10 MHz, with 1 pulse per second (PPS). You can use an external GPS source as the chassis clock source, or configure the external clock interface to output either the selected chassis clock source or a recovered line clock source. GPS input provides a precise external frequency reference for chassis synchronization, while GPS output enables the router to distribute timing signals to downstream network elements.