GP-1000 NTP Server is a robust and compact DIN Rail mount device designed to serve GPS time to NTP clients in a network and provide accurate GPS synchronized timecode to legacy devices over its modulated and unmodulated IRIG-B outputs. It can be deployed in a wide range of environments from private networks such as Railways and Metro (ticketing and platform) networks, Telecom server racks, Data-centers, Electric Sub-Stations, Power Distribution and Transmission, that are required to maintain complete isolation from public networks for security reasons.

NTP Server with 1PPS and IRIG-B output

GP-1000 establishes a highly accurate phase-synchronized frequency and time base by synchronizing to the GPS / GNSS satellites’ atomic clocks to distribute synchronized time over packet based networks including Ethernet, Carrier Ethernet, IP and IP/MPLS Networks. The GP-1000 provides an accurate 1PPS that may be used to synchronize test equipment in lab setups. Features such as password based access, SSH as well as MD5 and SHA1 authentication for NTP requests ensures operational reliability and security. Additional features include secure remote login and firmware upgrade capabilities. GP-1000 includes complete SNMPv3 monitoring as well as support for enterprise directory services for user authentication, internal and external logging and monitoring of alarm and error messages through Syslog and e-mail alert ensures a high level of system manageability. Other features include concurrent IPv4 and IPv6 network interfaces for future network upgrades.


High performance NTP server

Supports up to 3000 NTP requests per second

IRIG-B output

GPS synchronized unmodulated IRIG-B output

TCXO Holdover

Accurate holdover with temperature compensated TCXO

1 PPS output

GPS phase locked 1PPS output

Secure Remote Management

Configuration over SSH with password strength monitor

Flexible Power Supply

15V ~ 60V DC wide range DC input with reverse polarity protection


  • High Accuracy GPS / GNSS time reference for SCADA applications
  • 10/100 BaseT Ethernet NTP Server interface
  • IRIG-B unmodulated outputs
  • 1PPS output
  • External alarm relay (NO/NC)
  • Stratum 1 compliant (PR) Primary Reference Source when locked to GPS
  • High performance NTP server - Services up to 3000 NTP requests per second
  • Supports upto 15,000 NTP and SNTP clients
  • Supports Unicast, Multicast and Broadcast NTP clients
  • Leap Second correction
  • MD5 and SHA1 authentication for NTP clients
  • Temperature compensated quartz oscillators TCXO hold-over
  • Alarm via SNMP Traps, SYSLOG
  • Simaltaneous IPv6 and IPv4 operation
  • Supported network protocols: IPv4, IPv6, SSH, TELNET, FTP, SYSLOG, SCP
  • Secure network management

Additional Features:

  • High bandwidth NTP Server capable of supporting up to 3000 NTP requests per second
  • IPv4 and IPv6 compatible NTP Server
  • RADIUS Authentication
  • SNMPv3 support
  • Remote management over SSH and TELNET
  • Reverse polarity protection
  • Power Contact and Lightening Protection as per Telcordia GR-1089-CORE and EN61000-4-5 Level 3 specifications

Technical Specifications

Ethernet Interfaces:
Number of Ethernet Ports 1
Type RJ-45
Interfaces (1) 10/100BaseT Ethernet Interfaces: NTP Server + Management
Synchronization Outputs
IRIG-B (1) Unmodulated (RS-232)
(1) Unmodulated (RS-485 differential pair)
(1) Unmodulated (50 Ohm BNC)
B000, B002, B003, B004, B005, B006, B007
Frequency - Phase locked with GPS (1) 1 PPS - 50 Ohms BNC
Power Input
DC Input 15 ~ 60V DC
External Power Supply Options
AC Input 100V~240V AC
DC Input 110V DC
Form Factor DIN Rail Mount
GPS/GNSS Receiver Specifications:
  • 50 Channel GPS Receiver
  • 72 Channel GNSS Receiver
  • GPS L1 frequency, C/A Code Receiver
  • Tracks up to 12 satellites simultaneously
  • Synchronizing Time:
    • Acquisition time - Hot Start: Less than 15 sec.
    • Acquisition time - Warm Start: Less than 45 sec.
    • Acquisition time - Cold Start: Less than 140 sec.
  • GPS Signal
    • Tracking and Navigation: -162 dBm
    • Reacquisition -160 dBm
    • Cold Start -148 dBm
  • Integrated GPS Antenna
  • Accuracy of Time-Pulse Signal referenced to GPS: +/-30ns (raw), in Stationary Mode
  • Accuracy of Time-Pulse Signal referenced to GNSS: +/-20ns (raw) in Stationary Mode
  • Accuracy of Time-Pulse Signal referenced to GPS/GNSS: +/-15ns (compensated)
    (Note: with all satellites in view at -130db)
  • User configurable for “Stationary” or “Moving” Applications. May be configured for use in Portable, Automobile, Maritime Application Modes.
Network Time Protocol
  • NTP v2, (RFC 1119), NTP v3 (RFC 1305), NTP v4, (RFC 5905), SNTP v3 (RFC 1769), SNTP v4 (RFP 2030), MD5 Authentication
  • NTP peering support
  • Internet Protocol: Ipv4
  • Time Protocol: TIME (RFC 868)
  • Daytime Protocol: DAYTIME (RFC 867)
Antenna Specifications
  • Integrated Antenna
  • Antenna Type: Active
  • Amplifier Gain: Typical 27dB (GPS L1 band)
  • Operating temperature: -40C to +75C
  • Lightning protection: According to EN61000-4-5 Level 4.
Communication Interfaces
Management SSH/TELNET
Integrated HTTP Interface
Serial (USB and RS232)
Reporting and Logging SYSLOG
Integrated HTTP Interface
Serial (USB and RS232)
Ordering Information


Part Code Description Options
ZZ PSU Input type AC / DC
LP Lightning Protection Kit 1 (required) or 0 (not required)


  • Telecom rack and server synchronization
  • Power generation and distribution companies and other utility companies
  • Wireless and Wireline Telecom synchronization
  • Synchronizing airports and aviation communications
  • Synchronizing railway signalling networks and railway communications
  • Synchronizing traffic management
  • Broadcasting Network and Broadcast equipment synchronization.


Data Sheet (PDF)