Telecom Synchronization Solution

The Dapu telecom synchronization solution supports major ITU-T timing standards including G.813 (SDH equipment slave clocks), G.8262 (Synchronized Ethernet equipment clocks), and G.8263 (Packet-based equipment clocks). The TCXOs with ±0.5-2.5ppm stability meet the frequency accuracy requirements of these standards. The VCXOs with appropriate pull ranges support the tracking and holdover requirements. For specific compliance validation, we recommend testing against the relevant standard using standard test equipment. Our FAE team can provide guidance on compliance testing and can review your design for standard compliance.

Solution supports G.813, G.8262, G.8263. Contact us for compliance testing guidance.

PLL loop filter design for the Dapu VCXO follows standard PLL design procedures. First, determine your loop bandwidth requirements - typically 100Hz-1kHz for telecom applications. Second, calculate the VCXO gain (Kvco) which is approximately pull range divided by control voltage range (e.g., 100ppm of 19.2MHz = 1.92kHz over 2.7V range = 710Hz/V). Third, determine your phase detector gain (Kpd) from your PLL chip datasheet. Fourth, calculate loop filter components using standard second-order PLL equations. Fifth, verify stability margins and phase margin. Dapu provides application notes with example calculations. Our FAE team can review your loop filter design and provide recommendations.

Use standard PLL design with Kvco ≈ 710Hz/V for 19.2MHz VCXO. Contact us for design review.

Holdover performance depends on the TCXO stability grade and the holdover algorithm implementation. With the ±0.5ppm TCXO, typical holdover performance is ±1-2μs over 24 hours when properly calibrated. With ±1.0ppm TCXO, expect ±2-4μs over 24 hours. The actual performance depends on temperature variations during holdover, aging characteristics, and the quality of the holdover algorithm. For better holdover, consider using OCXO products which can achieve ±0.1-0.5μs over 24 hours. For carrier-grade applications requiring <1μs holdover, we recommend the ±0.5ppm TCXO with temperature compensation in the holdover algorithm.

±0.5ppm TCXO provides ±1-2μs/24hr holdover. Contact us for OCXO options if better holdover needed.

Yes, Dapu timing components are suitable for 5G base station applications. 5G NR uses similar timing frequencies as 4G LTE (e.g., 38.4MHz reference). The stability requirements for 5G are similar or slightly more stringent than 4G depending on the deployment scenario. For sub-6GHz 5G, the ±0.5-1.0ppm TCXOs are adequate. For mmWave 5G, better stability may be required. The phase noise requirements for 5G are more stringent due to higher modulation orders - verify the phase noise specifications meet your specific 5G chipset requirements. Dapu is developing enhanced products specifically for 5G applications. Contact our FAE team for the latest 5G timing product recommendations.

Suitable for sub-6GHz 5G. Verify phase noise for mmWave 5G. Contact us for latest 5G products.

Dapu TCXOs typically have aging rates of ±1-3ppm per year, depending on the specific model and grade. The aging is measured as frequency drift over time at constant temperature. First-year aging is typically higher than subsequent years. Aging is caused by stress relaxation in the crystal mounting and contamination effects. For applications requiring long-term stability (e.g., holdover applications), the aging rate should be factored into the system design. Periodic recalibration can mitigate aging effects. For better aging performance, consider OCXO products which typically have <0.5ppm/year aging. Aging data is available from factory test records for qualification purposes.

Typical ±1-3ppm/year aging. Factor into long-term stability calculations. OCXO available for better aging.