Masterclock manufactures a variety of timing PCIe cards to provide millisecond synchronization accuracy for your server or PC. Our timing cards can be upgraded to include TCXO and OCXO time bases and offer multiple input options such as GPS, IRIG-B, SMPTE/EBU.
Since we started adding Leap Seconds in 1972, there have been 26 of them - with the 27th to follow at 11:59:59 p.m. UTC (6:59:59 p.m. ET) on Dec. 31, 2016. The most recent addition occurred on June 30, 2015, which was the first since 2012 and the second since 2008. None were added from 1999-2004, but one was added every year with only five exceptions from 1973-95.