HJ2000B NTP Network Time Server

Overview

The HJ2000B NTP Network Time Server is a high-performance network time synchronization solution designed to provide precise and reliable time services for enterprise IT systems, industrial control systems, financial applications, telecommunications networks, medical systems, energy infrastructure, transportation networks, and other mission-critical environments.

Supporting standard NTP v1/v2/v3/v4 and SNTP protocols, the HJ2000B can provide accurate network time synchronization and timestamp services for computer systems, process control systems, e-commerce platforms, B2B systems, database clusters, servers, network devices, and other connected equipment.

The HJ2000B supports GPS and BeiDou satellite reference sources, multiple reference-source redundancy, network interface redundancy, dual-server hot standby, and flexible time signal input/output configurations. Its modular architecture allows the system to be configured according to different network capacity and synchronization requirements.

The network interfaces support NTP by default and can be configured to support IEEE 1588v2 PTP (Precision Time Protocol), making the HJ2000B suitable for applications requiring both network time synchronization and high-precision time distribution.

Key Features

• <30 ns hardware synchronization accuracy with GPS/BeiDou reference, typical RMS value

• <0.1 ms NTP synchronization accuracy on a typical LAN

• <10 ms NTP synchronization accuracy over complex networks

• Up to 139,000 NTP requests per second per port

• Supports more than 5 million NTP clients

• <1 × 10⁻¹² average daily frequency accuracy

• >100,000 hours MTBF

• 1PPS precise timing output

• 2 × Gigabit Ethernet ports as standard

• Up to 5 PCI-E expansion slots

• Up to 20 Gigabit Ethernet ports or 10 10GbE optical ports, depending on configuration

• Optional Rubidium atomic clock or OCXO

• Optional redundant power supply

• Optional battery/DC power input

• Optional CDMA/4G reference input

• Optional IRIG-B input

• Optional PPS + TOD input

• Optional PTP input

• Optional IRIG-B and 10 MHz timing signal outputs

• Dry-contact alarm interface available

• Web-based management interface

• SNMP network management

• NTSM monitoring software

• Support for redundant reference sources

• Network interface bonding and redundancy

• Dual-server hot standby with virtual IP

• Comprehensive event and system logging

NTP Time Synchronization

The HJ2000B supports standard network time synchronization protocols including:

• NTP v1/v2/v3/v4

• SNTP

• Unicast

• Multicast

• Broadcast

• Autokey

• IEEE 1588v2 PTP, configurable by software

The system can operate as a Stratum 1 NTP time server when synchronized directly to a satellite reference source, or as a secondary/Stratum 2 time server depending on network architecture.

It can synchronize servers, workstations, network switches, routers, industrial controllers, databases, security systems, communication equipment, and other network-connected devices.

GPS and BeiDou Reference

The HJ2000B can use GPS, BeiDou, or combined GPS + BeiDou satellite signals as external reference sources.

Multiple reference sources can be configured according to priority, allowing automatic switching between available references to improve service continuity and system reliability.

The system can also support other external timing references, including:

• 1PPS + TOD

• IRIG-B

• CDMA/4G network timing

• IEEE 1588v2 PTP

High-Performance NTP Server

The HJ2000B is designed for high-density network time synchronization applications.

Performance:

• NTP request processing: ≥139,000 requests/second

• Supported clients: >5,000,000

• LAN NTP synchronization accuracy: typically 0.1–2 ms

• Satellite-referenced synchronization accuracy: <100 ns

• Complex network synchronization accuracy: <10 ms

This performance makes the HJ2000B suitable for large enterprise networks, data centers, telecommunications infrastructure, industrial networks, financial systems, and other environments with a large number of NTP clients.

Network Redundancy and High Availability

For applications where continuous time synchronization is critical, the HJ2000B supports several redundancy mechanisms:

• Reference-source redundancy

• Network interface redundancy

• Network interface bonding

• Load balancing

• Heartbeat detection

• Virtual IP address

• Dual-server hot standby

These functions can help maintain continuous time synchronization when a reference source, network interface, or primary time server becomes unavailable.

PTP / IEEE 1588v2 Support

The HJ2000B network interfaces support NTP as standard and can be configured for IEEE 1588v2 PTP operation.

PTP support makes the system suitable for applications requiring more precise synchronization between network devices and equipment, including:

• Industrial automation

• Telecommunications

• Power systems

• Transportation

• Network infrastructure

• Measurement and control systems

• High-precision distributed systems

Security and Management

The HJ2000B provides multiple management and security functions for enterprise network environments.

Supported features include:

• MD5 authentication

• Web-based remote management

• SSH

• Telnet

• FTP

• SNMP v1/v2/v2c/v3

• Syslog

• Email alarm notification

• Console management

• Event and system logging

• Remote configuration and maintenance

The system also provides monitoring functions for the NTP server, reference sources, network status, synchronization status, and connected NTP clients.

NTSM Monitoring Software

The optional NTSM monitoring software provides centralized monitoring of HJ2000B time synchronization systems.

It can monitor:

• NTP server operating status

• Synchronization status

• Time offset

• Stratum information

• GPS/BeiDou reference status

• Satellite positioning information

• NTP client access

• Client time deviation

• Reference-source switching

• Server cluster status

Alarm functions can be configured for:

• Time deviation thresholds

• Loss of satellite lock

• Synchronization status changes

• Server faults

Supported alarm methods include SNMP, Syslog and Email.

Modular Network Expansion

The HJ2000B uses a modular PCI-E expansion architecture for flexible network configuration.

The system can provide up to 5 PCI-E expansion slots.

Each slot can support:

• 4 × Gigabit Ethernet ports, or

• 2 × 10GbE SFP+ optical ports

Depending on the configuration, the system can support up to:

• 20 Gigabit Ethernet ports, or

• 10 × 10GbE optical ports, or

• A combination of copper and optical network interfaces.

This modular design allows the network time server to be configured for different network capacity and infrastructure requirements.

Timing Signal Outputs

1PPS Output

• UTC time deviation: <30 ns RMS

• TTL level

• Positive edge

• Pulse width: 100 ms

• RS232 output available

• Baud rate: 9600

• Format: 8-N-1

Optional Timing Outputs

• IRIG-B

• 10 MHz

• 1PPS

• Other timing signal configurations according to system configuration

External Reference Inputs

The HJ2000B can support multiple external timing reference interfaces depending on configuration.

1PPS + TOD

• TOD based on NMEA 0183 protocol

IRIG-B

• RS422 electrical interface

• Compatible with GJB2991A-2008 requirements

Mobile Network Reference

• CDMA/4G timing reference

PTP

• IEEE 1588v2 compliant PTP input

System Interfaces

Standard Interfaces

• 2 × 10/100/1000M adaptive Gigabit Ethernet

• 1 × RS232 Console

• 1 × 1PPS output

• 4 × USB

• 1 × VGA

• 1 × GPS/BeiDou antenna interface

Optional Interfaces

• PCI-E network expansion

• 10GbE SFP+

• External timing reference input

• PTP

• 10 MHz

• IRIG-B

• Dry-contact alarm

• Battery/DC input

Physical Specifications

Front Panel

The front panel includes a touch display and status indicators for convenient system monitoring and configuration.

The display can provide information including:

• Current time

• GPS/BeiDou synchronization status

• Number of visible satellites

• Position information

• Network interface IP addresses

• System operating status

• Alarm status

Network and reference-source parameters can also be configured through the front-panel interface.

Rear Panel

The standard rear-panel interfaces include:

• ANT: SMA satellite antenna input with 5V antenna power

• ETH0–ETH1: RJ45 Gigabit Ethernet

• CONSOLE: DB9 RS232 console interface

• 1PPS: BNC TTL output

• USB: 4 × USB interfaces

• VGA: 1 × VGA interface

Optional rear-panel interfaces can include PCI-E network expansion, SFP+ optical ports, external timing references, PTP, 10 MHz, IRIG-B, dry-contact alarm, and battery interfaces.

Typical Applications

The HJ2000B NTP Network Time Server can be used in a wide range of applications where reliable and accurate network time synchronization is required:

• Data Centers & IT Infrastructure

• Enterprise Networks

• Telecommunications

• Financial Systems

• Power & Energy

• Industrial Automation

• Transportation

• Healthcare & Medical Systems

• Oil & Gas

• Security & Surveillance

• Database Clusters

• Network Management

• Industrial Control Systems

• Government & Public Infrastructure

• Research & Measurement Systems

Typical System Architecture

GPS/BeiDou Satellite → HJ2000B Time Server → NTP/PTP Network → Servers / PCs / Network Devices / Industrial Equipment

For high-availability applications, two HJ2000B units can be deployed using heartbeat detection and virtual IP-based hot standby architecture to improve service continuity.

Standard Package

The standard package may include:

• HJ2000B NTP Network Time Server × 1

• High-sensitivity timing antenna with 30 m cable × 1

• Rack mounting brackets × 1 set

• Power cable × 1

• Control cable × 1

• User documentation × 1

• Software/documentation media × 1

Optional Accessories

• Antenna surge protector

• 50 m / 80 m / 100 m antenna cables

• Portable calibration unit

• Network digital clock

• Additional network interface modules

• 10GbE optical modules

• External timing reference modules

• Battery/DC power accessories