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Scalable 24-Hour Holdover for Reliable Network Synchronization
Production
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.
24-hour holdover in real world conditions for 2x better service continuity
- Inclusive of dynamic temperature changes up to 20°C
Advanced compensation via I2C digital interface
- 0.01 ppb/day aging
- 5E-14 frequency pull resolution
- Eliminate frequency shift caused by board noise
Exceptional dynamic stability under airflow, fast temp. ramp
- ±1 ppb over-temp. stability from -40 to 95°C
- ±0.01 ppb/°C frequency slope (ΔF/ΔT) -- Ensures system-level quality of service for telecom and networking equipment in hostile environments
- 4E-12 HDEV at 10 second averaging time
3x lower power and 25x less volume for compact edge and datacenter devices
Best phase noise under vibration
- Minimizes call and/or link drops in high-vibration environments
No activity dips or microjumps
- Eliminates any need for costly screening or burn-in tests
On-chip power-supply noise filtering for excellent PSNR
- Reduces BOM by eliminating a dedicated LDO for OCXO
LVCMOS or clipped sinewave output
- Optimizes for best balance between EMI and jitter
Rich programmable features
- Any frequency between 10 to 60 MHz
- 2.8 and 3.3V power supply options
Superior reliability – reduces field failures and repair costs due to clock components
- 1 billion hours MTBF
- Lifetime warranty
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This full-featured product demo is designed to run on the AMD (Xilinx) Zynq UltraScale+ MPSoC ZCU102 evaluation kit.
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