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NTP100-GPS NTP Server


Network Time Protocol (NTP) Server 

The NTP100-GPS network protocol time server (NTP) from Masterclock synchronises to GPS satellites and sends NTP reference signals to NTP devices via Ethernet.

When synchronised to the atomic clocks in GPS and GLONASS satellites, the long term accuracy of the device is the same as the atomic clock of the GNSS.

An internal TCXO (temperature-compensated crystal oscillator) provides holdover stability of ± 1 min/year during GPS signals loss, and an optional OCXO (oven-controlled crystal oscillator) increases holdover stability to ± 250ms/year. 



  • Provides time legally-traceable UTC
  • NTP output accuracy of ± 2 ms
  • Synchronized to atomic clocks in GPS satellites for Stratum 1 accuracy
  • Typical holdover stability of ± 1 min/year using high precision internal TCXO during GPS loss
  • High-stability option with OCXO provides typical stability of ± 250 ms/year
  • Time stamp precision of 5-10 ms
  • NTP query (unicast), multicast, or broadcast modes
  • Assignable network configuration
  • Configuration via Telnet/SSH or included WinDiscovery
  • IPv4/IPv6 compatible
  • MD5 authentication


Holdover Accuracy

  • With loss of power, device reverts to an internal precision TCXO temperature-compensated crystal oscillator with accuracy of ± 1min/year or < 165ms per day
  • High-stability option with OCXO provides typical stability of 1 ppb/ day (± 250ms/year) after 30 days of aging


  • RJ45 - 10/100MB Ethernet
  • DC input - 2.1 mm male jack
  • RS-232 - 9 pin male
  • Antenna - SMA
  • USB for configuration

Physical Size

  • Size: 6.44 x 4.06 x 1.44 in (16.35 x 10.32 x 3.65 cm)
  • Weight: 16 oz (453.6 g)

Operating Parameters

  • Temperature: 0 to 60°C
  • Humidity: Up to 90% (non-condensing)

Network Compatibility

  • Supports NTP, DHCPv4, DHCPv6 for automatic acquisition of network address, name servers, and timeserver configuration
  • Telnet/SSH communication
  • IPv4/IPv6 compatible


  • Configure devices through provided WinDiscovery software or Telnet/SSH
  • Configuration is saved to nonvolatile memory and survives power losses
  • Authenticated network messages prevent unauthorized tampering of clock configuration

Power Supply

  • DC input (9-28 VDC)
  • Power consumption: < 7.5W
  • Includes external 24 VDC wall-mount power supply with locking DC plug
  • (UL and CE listed)


  • FCC, ROHS, CE Marked, ANSI


  • Weather-proof, pre-amplified antenna included with 16 ft (5 m) of coaxial cable
  • Optional antenna kit is available with antenna, 50 ft (15 m) cable and antenna

Technical documents

Ordering information

There are a range of options available. Please contact Sarsen to discuss your project requirements.