Listen to Paul Skoog of Microchip explain more about oscillators in this video.

What Are OCXO and Rubidium Oscillators?

• OCXO (Oven-Controlled Crystal Oscillators):
  OCXO oscillators are highly stable quartz-based devices. They are housed in a temperature-controlled “oven” that maintains a constant temperature, minimizing the effects of external temperature variations. This precise control results in exceptional frequency stability.
• Rubidium Oscillators:
  Rubidium oscillators are atomic clocks that use the vibrations of rubidium atoms as their timekeeping element. These oscillators offer greater long-term stability than crystal oscillators, as they are less affected by environmental factors and aging.

Key Comparisons: OCXO vs. Rubidium Oscillators

1. Accuracy and Stability

• OCXO: Provides excellent short-term stability, making it ideal for environments with minimal temperature fluctuations.
• Rubidium Oscillators: Offers superior long-term stability and precision, especially for applications where maintaining synchronization over extended periods is critical.

2. Holdover Performance

• OCXO: Suitable for shorter holdover periods (minutes to hours). The frequency can drift over longer periods if the server loses its external timing source.
• Rubidium Oscillators: Excels in long holdover scenarios, maintaining precise timing for hours or even days without a GPS signal.

3. Power Consumption

• OCXO: Generally consumes less power than rubidium oscillators, making it an energy-efficient option.
• Rubidium Oscillators: Requires higher power to maintain atomic transitions, which may not be ideal for power-sensitive applications.

4. Cost

• OCXO: More affordable than rubidium oscillators, making it a cost-effective choice for standard NTP servers or smaller networks.
• Rubidium Oscillators: Typically more expensive due to the complexity of atomic clock technology, often justified for high-value, mission-critical systems.

5. Size and Maintenance

• OCXO: Compact and low-maintenance. Its simpler design means fewer components are prone to failure.
• Rubidium Oscillators: Slightly larger and requires periodic recalibration to maintain optimal performance over its lifespan.

6. Applications

• OCXO: Ideal for general-purpose NTP and PTP servers, where cost and power efficiency are important, and ultra-long holdover isn’t required.
• Rubidium Oscillators: Preferred in advanced systems like telecom networks, military applications, and high-frequency trading, where maximum stability and accuracy are essential.

Which Oscillator Should You Choose?

The choice between an OCXO and a rubidium oscillator depends on your specific needs:

• Choose OCXO if you:
  • Need a cost-effective solution.
  • Operate in environments with stable temperatures.
  • Require short-term holdover performance.
• Choose Rubidium Oscillators if you:
  • Demand long-term timing stability.
  • Expect frequent interruptions in GPS signals.
  • Manage mission-critical applications requiring uncompromising precision.

OCXO and Rubidium Oscillators in NTP and PTP Servers

Both OCXO and rubidium oscillators play vital roles in ensuring the reliability and precision of NTP and PTP servers. While OCXO oscillators offer a great balance of performance and cost, rubidium oscillators deliver unparalleled accuracy for advanced and demanding synchronization needs.

For modern network infrastructures, many server manufacturers incorporate both options, allowing you to select the oscillator that aligns with your operational priorities. By understanding the differences, you can optimize your network’s performance and ensure a seamless timing solution.

Conclusion

When considering oscillators for your NTP or PTP server, evaluating accuracy, stability, cost, and application requirements is crucial. OCXO oscillators provide dependable performance for most networks, while rubidium oscillators deliver unmatched stability for high-stakes environments.

For expert guidance on selecting the right oscillator for your synchronization needs, Syncworks is here to help. Contact us today to explore our range of timing solutions tailored to your infrastructure.

Learn more. Watch this oscillator tutorial from WSTS by Ullas Kumar on our YouTube channel. 

About Syncworks

Because we are the world’s leading service and support experts for timing equipment, Syncworks is a trusted partner in evaluating, designing, and implementing timing networks. Buying from us means buying value adds that make you and your network more secure. As a Microchip Diamond Partner and a skilled integrator of various vendor products, we specialize in building resilient networks that are best for you. We offer expert support, sparing, and repairs, backed by one of the largest inventories of sync and timing equipment in the industry.
For more information, contact sales@syncworks.com or call (904) 280-1234.