The VCL-2103 Sub-Master Clock mediates between the Primary GPS Reference (Master) Clocks 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 better than 0.5 millisecond accuracy.
The VCL-2103 Sub-Master Clock is a highly accurate time-source that is equipped with an internal OCXO (with aggregate aging of less than 50us /day) that can accurately synchronize its “Salve” Terminals with an un-matched, better than 0.02 seconds / year hold-over accuracy in the event of loss synchronization with all “Primary Reference Time Sources”.
The VCL-2103 Sub-Master Clock provides two distinctly separate Ethernet Interfaces, 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. 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. The VCL-2103 Sub-Master Clock automatically negotiates with and select the best available “Primary Reference Time Source” (i.e. the clock with the highest Stratum Level Time Source with minimum Jitter) to ensure that the “Client-Side NTP Terminals” are synchronized to the most accurate and most reliable “Primary Time Source” to provide 99.9999% time source reliability and availability.
NTP Sub-Master Clock for Network Isolation & Cyber Security