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GMR6000Resilient, High-Precision, Multi-Function NTP & PTP Master Clock

13-Digit LED Display

GMR6000 Master Clock
  • Mission-critical Stratum 1 timing solution
  • Capability of synchronizing to GPS, GNSS, IRIG-B, or PTP reference
  • Four configurable Masterport BNC outputs
  • The GMR-6000 includes fully customizable Masterports which can output IRIG, SMPTE, video/audio sync and more.
  • The system supports power redundancy with AC and DC options
  • Internal-disciplined high-stability OCXO or Rubidium options allow for critical holdover resiliency.
  • Optional modules provide flexible input/output signal support
  • SNMP v3 with custom MIB
  • Supports high-accuracy PTP and hardware timestamping
  • Backward compatible with legacy signals

GMR6000 Base Model

From broadcast production to autonomous navigation, GMR6000 meets contemporary system requirements to generate and deliver accurate, legally traceable time and frequency signals for mission-critical operations. Synchronize an entire network by utilizing the GMR6000 as a master clock, PTP grandmaster, time code generator, or frequency reference. Mitigate risk of timing disruption and ensure system-wide resiliency with the GMR6000's multiple inputs, internal oscillator, built in power redundancy, and intelligent switching. All Masterclock time servers are manufactured on site in the US and backed by in-house engineering support accessible 365 days a year.

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GMR6000 Front

GMR6000 Back

Reference Documents

SpecificationsGMR6000 NTP & PTP Grandmaster Clock


  • Robust 1gbps Network Performance
  • Sync to multiple input sources for maximum resiliency
  • Advanced Anti-Jamming, Anti-Spoofing Detection and Mitigation
  • Internal oscillator (OCXO or RB) provides holdover up to +/- 500 nSec/24 hours
  • Intelligent switching and monitoring
  • Built in power redundancy
  • Closed-source firmware architecture
  • Configurable to meet DoD security requirements
  • Legally traceable time server for compliance auditing
  • Provides industry standard signals for IRIG, SMPTE, NENA, and other mission-critical groups
  • 8 multicolor status LEDs
  • Manufactured in house in the USA - TAA Compliant

  • NTP
  • RS232 (DB-9) / RS422 (5 Pos TB) and/or IP packet serial messages (NMEA 0183)
  • GNSS Receiver (Single or Multi-constellation)
  • Single L1 or Multiband L1, L2/L5 supporting GPS, GLONASS, GALILEO, BEIDOU, M-CODE GPS Receiver
  • PTP/IEEE1588
  • IRIG (DCLS/AM) and SMPTE Timecodes
  • PPS (Sync In)
  • 10 MHZ reference frequency
  • Configurable input reference priority

Standard Output
  • NTP
  • 10 MHZ Sinewave (BNC, 50 Ω,, low phase noise and phase locked to PPS out)
  • 1 PPS (BNC, 50 Ω)
  • RS232 (DB-9) /RS422 (5 Pos TB) and/or IP packet serial messages - NMEA 0183, NENA Format 0,1, or 8, Truetime-Kinemetrics
  • Programmable relay closure - NO/NC dry contact relay
  • Relay alerts loss of sync by default
Output Features
  • Four configurable Masterport BNC outputs support:
    • Time codes: IRIG (DCLS and AM) / SMPTE
    • Audio/Video Sync: Genlock Black-Burst, Tri-Level Sync, Wordclock, Dogger Fish Blue stream
    • 10 MHz Square Wave (Phase locked with PPS)
    • Additional PPS
    • Programmable Pulse
    • Programmable Reference Frequency
  • Masterport outputs utilize BNC connectors and are software switchable

  • Three Independently Addressable isolated 1GigE Ethernet ports (Two RJ45 , one SFP)
  • NTP Server: Synchronization of NTP and SNTP compatible clients
  • NTP authentication: MD5, SHA-1, SHA-2
  • PTP/IEEE 1588 Ordinary Clock or Grandmaster
  • Synchronization of IEEE1588-2008 (PTPv2) compatible Clients

  • Advanced Anti-Jamming, Anti-Spoofing Detection and Mitigation
  • Authenication on Dedicated Management Port(s),
  • Encrypted Protected Admin and User Passwords and Access Levels
  • Authenticated NTP

Features FAST Disciplining, and Low Phase Noise options for extended holdover with low drift. Choose between:

  • OCXO oscillator ±10 µsec / 24 hours
  • Rubidium Oscillator +/- 500 nSec/24 hours

  • Dedicated isolated management nework port
  • Additional USB managment port
  • Firmware updates made accessible for new features
  • Masterclock-provided WinDiscovery configuration and status monitoring utility.
  • SSH CLI (Command Line Interface)
  • Additional SNMP v1, v2, and v2c, v3 AES-256 monitoring (Traps) and logging with provided MIBs.
  • Syslog client
  • Easy to read, 13-digit 7 segment LED display (Date/Time or Day of year/Time)
  • Eight multicolor LEDs on the font panel indicate:
    • Power supplies
    • Holdover status
    • Lock indication
    • Stability - System Ready Indicator
    • Current Reference
    • GNSS Satellite Status

  • Select between single or dual power supplies
  • AC: 90-264VAC, 50/60Hz, IEC
  • DC: 24VDC, 48VDC, or 110 VDC
  • <20W Power Dissipation
  • [NEED dimensions, temperature and humidity guidelines]

Presentation by John Clark, CEO & Dr. Demetrios Matsakis, Chief ScientistTime Behind and Beyond the Clock

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