HJ5447-PTP PCIe PTP Timing Card

High-Precision PCIe PTP Synchronization Card with OCXO Holdover

The HJ5447-PTP PCIe PTP Timing Card is a high-precision timing and synchronization solution designed for computer systems, servers, communication equipment, measurement instruments and other applications requiring accurate and stable time references.

The card integrates a high-performance IEEE 1588 PTP synchronization engine with a high-stability OCXO (Oven-Controlled Crystal Oscillator). It receives PTP timing information through an Ethernet interface and uses the PTP reference to discipline the internal oscillator.

When the external PTP reference is temporarily unavailable, the integrated OCXO provides local holdover capability, allowing the card to continue supplying stable timing information to the host system.

The HJ5447-PTP provides high-precision timing outputs including 1PPS and TOD, making it suitable for telecom synchronization, broadcast systems, test and measurement equipment, industrial systems and other timing-critical applications.

Key Features

• Supports IEEE 1588-2008 / PTP v2.0

• Compatible with PTP v1.0

• Integrated high-precision PTP processing unit

• Integrated high-stability OCXO

• PTP reference disciplining for improved timing stability

• OCXO holdover during temporary PTP signal loss

• Point-to-point synchronization accuracy of <300ns<>

• 10/100M adaptive Ethernet interface

• Hardware timestamping

• Real-time operating system

• Integrated high-precision hardware RTC

• Supports NMEA0183 and CM-format TOD input

• 1PPS and TOD timing interfaces

• PCIe form factor for direct installation in compatible computer systems

PTP Synchronization

The HJ5447-PTP receives precise timing information from a PTP Grandmaster or other IEEE 1588-compatible timing source through its Ethernet interface.

The integrated PTP processing unit evaluates the received timing reference and uses it to discipline the internal OCXO.

This provides the host system with a stable and accurate local timing reference while reducing the impact of temporary network timing interruptions.

PTP Features

• IEEE 1588 PTP v2.0 support

• PTP v1.0 compatibility

• Hardware timestamping

• 10/100M Ethernet interface

• Point-to-point synchronization accuracy: <300ns<>

• Automatic synchronization to the external PTP reference

OCXO Holdover

The integrated OCXO provides a stable local frequency reference for the timing card.

During temporary loss of the PTP synchronization signal, the card can continue operating using the internal high-stability oscillator.

This holdover capability helps maintain continuous timing availability for systems where uninterrupted time and frequency references are important.

OCXO Specifications

• Daily aging rate: 5×10⁻¹⁰

• High-stability frequency reference

• PTP-disciplined operation

• Local holdover during PTP reference interruption

High-Precision Hardware RTC

The HJ5447-PTP incorporates a high-precision hardware real-time clock.

The hardware RTC provides the host computer with a stable local time reference and supports accurate system time management, data processing and event analysis.

The specified hardware RTC time accuracy is better than 0.001ms.

Timing Outputs

1PPS Output

The card provides a dedicated 1PPS timing output for external synchronization and measurement applications.

• Interface: SMA-K

• Quantity: 1

• Pulse width: 500ms

• Accuracy: ≤500ns

• Condition: After 24 hours of PTP synchronization

TOD Output

The TOD interface provides time-of-day information to external systems.

• Interface: Micro USB

• Electrical level: RS232

• Baud rate: 9600

• Format: 8-N-1

• Supported formats: SYS / GPRMC

• NMEA0183-compatible timing information

Network Interface

The HJ5447-PTP provides a dedicated Ethernet interface for receiving PTP synchronization information.

Status Indicators

The card provides dedicated status indicators for convenient system monitoring.

• LOCK indicator — indicates PTP synchronization status

• 1PPS indicator — indicates 1PPS timing output status

Applications

The HJ5447-PTP PCIe Timing Card is suitable for a wide range of precision timing applications.

Telecom & Network Synchronization

• Telecom timing systems

• Network synchronization

• Communication equipment

• PTP-based timing infrastructure

• CDMA and WiMAX systems

Broadcast & Media

• DVB

• DAB

• CMMB

• Broadcast synchronization

• Precision timestamping

Test & Measurement

• Precision measurement instruments

• Test equipment

• Frequency reference systems

• Data acquisition systems

Industrial & Control Systems

• Industrial automation

• Process control

• Monitoring systems

• Time-sensitive data processing

Server & Computer Systems

• Server time synchronization

• High-precision timestamping

• Computer system time reference

• Data processing and event analysis

• Fault diagnosis and system maintenance

Technical Specifications

Standard Package

• HJ5447-PTP PCIe PTP Timing Card × 1

• Electronic User Manual × 1

Product appearance and specifications are subject to the actual product supplied.

Related Products

• PCIe PTP Timing Cards

• PTP Grandmaster Clocks

• GNSS Network Time Servers

• IEEE 1588 Synchronization Solutions

• Telecom Synchronization Equipment

• OCXO Timing Solutions

• Precision Time & Frequency Products