PTP IEEE-1588v2

Grandmaster with NTP SERVER



GP-1100, PTP IEEE-1588v2 Grandmaster with 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 a 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.

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, 1/5/10MHz, 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 authentication ensures operational reliability and security. Additional features include remote login and remote firmware upgrade (file transfer) 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 up gradation.

Key Features


IEEE-1588v2 PTP Grandmaster

ITU-T G.811 compliant

2.048MHz and 10MHz frequency outputs

Rugged Construction

IP65 Polycarbonate, corrosion resistant outdoor enclosure

Standard PTP Profiles

Default, Telecom, Power, SMPTE, Telecom2 and Power2

NTP requests

Supports up to 3000 NTP requests per second

Supported protocols


Features and Highlights

  • 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 authentication for NTP clients
  • 1/5/10 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 back light.

Additional Features

  • IEEE - 1588v2 PTP Grandmaster
  • High bandwidth NTP Server capable of supporting up to 5000 NTP requests per second
  • IPv4 and IPv6 compatible NTP Server
  • SSH, Telnet, Radius, SNMP V2 MIB, Password Protection
  • Redundant AC and DC power supply options
  • 4, 10/100/1000BaseT Network Interface Ethernet Ports
  • Power Contact and Lightening Protection as per Telcordia GR-1089-CORE.

Typical Synchronization Applications

  • 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.

Technical Specifications


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
  • Internet Protocol: Ipv4
  • Time Protocol: TIME (RFC 868)
  • Daytime Protocol: DAYTIME (RFC 867)

Frequency Outputs:

  • 1 x 2.048 MHz, 75 Ohms, phase-locked
  • 1 x 10 MHz, 50 Ohms, phase-locked
  • 1 x 1 PPS, phase-locked to UTC (BNC)

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
  • Lightening Protection: According to EN61000-4-5 Level 4.


Application 1: GP-1100


Data Sheet (PDF)