GP-1100, PTP IEEE-1588v2 Grandmaster with an integrated NTP server is designed to provide PTP, NTP and ITU-T G.811 Primary Reference Clock that is locked to a GPS / GNSS Reference to provide time synchronization to private networks such as Railways and Metro (ticketing and platform) networks, Airports and Air-Traffic Control facilities, Electric Sub-Stations, Power Distribution and Transmission companies, Oil and Gas Utilities, ISPs and Cable TV networks as well as to Campus networks that are required to maintain complete isolation from public networks for security reasons. It may be also used by 2G, 3G and LTE service providers which provide a time of day reference to their customers over their wireless networks.

NTP Server with IEEE1588v2 PTP Grandmaster

GP-1100 locks to a GPS / GNSS reference to provide an NTP time reference on up to 4+1, 10/100BaseT Ethernet Ports which can be segregated to serve separate classes of assets in the network.

The GP-1100 is equipped with a highly accurate, low-noise OCXO to provide a high stability, ITU-T G.812, Type II, III compliant holdover clock with better than 12µs accuracy over a 24 hour (5 milliseconds per year) period in the event of unavailability of the GPS / GNSS signal, or GPS / GNSS antenna failure, or a temporary loss of reception in a totally isolated network without any external reference.

GP-1100 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-1100 provides a wide range of GPS / GNSS referenced frequency and time sources that include 2.048MHz, 10MHz, 1PPS frequency as well as an NMEA and NTPv4 time reference. Features such as maintaining a distinctly separate IP address for system management and control, password based access, SSH as well as MD5 and SHA1 authentication for NTP requests ensures operational reliability and security. Additional features include remote login and remote firmware upgrade capabilities. GP-1100 includes complete SNMP 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 DHCP for installation convenience and support concurrent IPv4/IPv6 support for future network upgrades.


High performance NTP server

Supports up to 3000 NTP requests per second

ITU-T G.811 compliant

2.048MHz and 10MHz frequency outputs

IEEE-1588v2 PTP (optional)

PTP Grandmaster with integrated NTP Server

Standard PTP Profiles

Default, Telecom, Power, SMPTE, Telecom2 and Power2

OCXO holdover

Accurate timekeeping in holdover mode

Supported Protocols


Phase Locked Frequency Outputs

2.048 / 10MHz outputs

Programable Pulse

Software configurable pulse - 1PPS to 1PPD


  • Reliable, Cost-Efficient Reference GPS Receiver
  • 50 Channel GPS, L1 frequency, C/A Code Receiver
  • Tracks up to 12 GPS Satellites
  • Concurrent tracking of up to a total of 34 Satellites
  • ITU-T G.811 Primary Reference (PRC) Clock
  • GPS locked G.703 compliant 1.544Mbits, 2.048MBits, 2.048 MHz 1 PPS and 1 PPM outputs
  • SSM Message format Compliant with ITU-T G.704. Optional GR-378-CORE for SONET Networks
  • ITU-T G.811 / Stratum 1 compliant (PR) Primary Reference when locked to GPS
  • Primary reference and holdover functionality:
  • ITU-T G.812 compliant holdover
  • Leap Second Support
  • MD5 and SHA1 authentication for NTP clients
  • 10 MHz output
  • 1 PPS and 1 PPM
  • IRIG-B outputs
  • Standard RJ45 and BNC connectors for all inputs and outputs
  • ToD compliant to NMEA 0183 (DB9 Serial Port)
  • LCD display with backlight.

Additional Features:

  • Optional IEEE - 1588v2 PTP Grandmaster
  • High bandwidth NTP Server capable of supporting up to 3000 NTP requests per second
  • IPv4 and IPv6 compatible NTP Server
  • SSH, Telnet, RADIUS Authentication, SNMPv3 MIB, Password Protection
  • Redundant AC and DC power supply options
  • 4 x 10/100/1000BaseT Network Interface Ethernet Ports
  • Power Contact and Lightning Protection as per Telcordia GR-1089-CORE.

Technical Specifications

Ethernet Interfaces:
Number of Ethernet Ports 6
Type RJ-45
Interfaces (4) 10/100BaseT Ethernet Interfaces: NTP Server
(1) 10/100/1000 Gigabit Ethernet Interface: Management + NTP Server
(1) 10/100/1000 Gigabit Ethernet Interface: IEEE-1588v2 (Optional)
Synchronization Outputs
IRIG-B (1) Modulated (RJ-45 conector) - B120, B122, B123, B124, B125, B126, B127
(1) Unmodulated (50 Ohm BNC)- B000, B002, B003, B004, B005, B006, B007
(Phase locked with GPS)
(1) 2.048MHz - 75 Ohms BNC
(1) 10MHz - 50 Ohms BNC
(1) 1 PPS - 50 Ohms BNC
(1) Programmable 1PPS to 1PPD - 50 Ohms BNC
Time of Day (1) NMEA 0183 (RS232)
Power Supply Options
AC Input 100V~240V AC
1+1 Redundant 100V~240V AC
DC Input 24V DC
48V DC (1+1 Optional)
110V DC (1+1 Optional)
AC + DC Input 48V DC + 100V~240V AC
Form Factor 1U 19" Rack 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 and SHA1 Authentication
  • NTP peering support
  • NTP Broadcast and Multicast support
PTP IEEE 1588-2008 V2 Grandmaster
  • <100ns Accuracy when locked with GNSS (GPS/GLONASS) in Stationary Mode
  • PTP Slave/Client capacity: 8, 16, 32
  • User Configurable: 1-step and 2-step Clock
PTP Profiles
  • Default IEEE-1588v2, 2008 PTP Profile
  • Default Power Profile.
  • Power Profile: IEEE C37.238-2011
  • Ethernet Default Profile (Layer 2 multicast)
  • Telecom-2008 Profile (Layer 3 unicast, pre-standard ITU-T G.8265.1, Ipv4)
  • ITU-T G.8265.1 (Layer 3 unicast, Ipv4)
  • Communication: Unicast, Multicast or Mixed
  • Best Master Clock Algorithm (BMCA)
Antenna Specifications
  • Integrated Antenna
  • Antenna Type: Active
  • Amplifier Gain: Typical 27dB (GPS L1 band)
  • Operating temperature: -40C to +75C
  • Reverse Polarity Protection
  • 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
XXX NTP only or NTP and PTP NTP / PTP
Y+Y Power Supply Option (1+1) / (1+0)
ZZ PSU Input type AC / DC / ACDC
LP Lightning Protection Kit 1 (required) or 0 (not required)


  • Synchronizing Cellular networks like UMTS, GPRS, 3G and LTE
  • Power generation and distribution companies and other utility companies
  • Wireless and Wireline Telecom synchronization
  • Distributing Time (ToD) and Frequency reference for power utilities across all nodes of the network
  • Synchronization of Defense Networks
  • Synchronizing airports and aviation communications
  • Synchronizing railway signalling networks and railway communications
  • Synchronizing traffic management
  • Broadcasting Network and Broadcast equipment synchronization.


Data Sheet (PDF)