SiTime Corporation Scalable 24-Hour Holdover for Reliable Network Synchronization TimeFabric™ Holdover Extension

24-Hour Holdover: Ensuring Reliable Access to Critical Network Infrastructure Holdover capability is essential for maintaining service continuity during GNSS signal loss or reference clock failure. A highly stable local oscillator keeps the system synchronized with the network until the reference is restored. Critical infrastructure—such as 5G centralized units, core routers, and datacenter time servers—requires 24-hour holdover to ensure uninterrupted access to network services. The SiTime Holdover Solution: TimeFabric Holdover Extension The TimeFabric Holdover Extension enables up to 24 hours of holdover—twice the duration of the Epoch OCXO alone. It learns the ultra-low daily drift of the reference clock and, when the reference is lost, actively adjusts the local oscillator to follow the expected drift trajectory. A Scalable Solution for Up to 24 Hours of Holdover System architects can extend holdover to 24 hours without modifying existing hardware. Built on SiTime’s 12-hour solution—which integrates the Epoch OCXO and Cascade 2 network synchronizer—the TimeFabric Holdover Extension reduces development time and extends the life of existing designs. As the most scalable 24-hour holdover solution available, it delivers longer performance without increasing size or power consumption—areas where the Epoch OCXO already leads.