VCL-2103 - NTP Sub-Master Clock, Time Distribution solution


Valiant’s VCL-2103, Sub-Master Clock is a high-performance intermediate time synchronization source which may be directly synchronized to a Primary GPS Reference (Master) Clock or any other NTP time source to provide Time-of-Day synchronization to secondary NTP / SNTP Slave devices in the network. The VCL-2103 Sub-Master Clock mediates between the Primary GPS Reference (Master) Clock or any other time source and the Slave NTP / SNTP devices, such as Time-Of-Day Display Clocks in a LAN, to effectively isolate the GPS Primary Reference Clock Source from the NTP / SNTP Slave devices and provide NTP / SNTP time-of-day synchronization with millisecond accuracy.

The VCL-2103 Sub-Master Clock provides two distinctly separate Ethernet Ports, each of which is assigned its own IP address which allows the VCL-2103 Sub-Master Clock to synchronize with the Primary GPS Reference (Master) Clock and to also provide time synchronization to multiple Slave NTP / SNTP devices in a LAN network.

Data Sheet

Multiple VCL-2103 Sub-Master Clock Units can be installed in a network to synchronize with the Primary GPS Reference (Master) Clocks to provide 1+1 or n+1 source redundancy in a NTP / SNTP time synchronization network.

Features and Highlights

  • IPv4 compliant Sub-Master Clock
  • Ethernet 10/100BaseT, NTP / SNTP Date and Time
  • Synchronization
  • EEPROM for setting retention after power down
  • High-Performance NTP Server running at 533MHz clock speed
  • Unmatched security. Password Protection and Firewall. Resistant to DOS (Denial of Service) attack and unauthorized access
  • Capable of serving up to 1500, VCL-2106 Slave Display Clocks or other standard / third party NTP/SNTP Clients


  • 1 x 10/100/1000BaseT Ethernet NTP Input Port with automatic synchronization to redundant NTP Server(s) based upon Stratum level of source for master clock synchronization.


  • 4 x 10/100BaseT Ethernet NTP / SNTP Output Ports for slave device(s) synchronization.


  • CE and FCC approval
  • Conducted Immunity as per IEC 61000-4-6
  • Radiated Immunity IEC 61000-4-3
  • Meets and exceeds CISPR 22 / EN55022 Class B emission requirements
  • Voltage and Surge Withstand: Meets and exceeds
  • IEC 61000-4-2, IEC 61000-4-4, IEC 61000-4-5 specifications.
  • Interruptions and Voltage variations meets and exceeds IEC 61000-4-11 specifications.

Local / Remote Management and Monitoring Ports:

  • USB
  • 10/100BaseT Ethernet RJ45
  • 1 x External Alarm Relay Contact

Local / Remote System Access, Control and Management Options:

  • Telnet, SSH
  • Online Firmware upgrade
  • CLI Control Interface (HyperTerminal or VT100)


NTP Sub-Master Clock for Network Isolation & Cyber Security

Data Sheet

Data Sheet