ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,388,548, issued on Aug. 12, was assigned to FIBER LOGIC COMMUNICATIONS INC. (Hsinchu, Taiwan).

"Holdover mode device, method and measurement and adjustment module" was invented by Che-Cheng Kung (Hsinchu, Taiwan) and Yu-Lun Lo (Hsinchu, Taiwan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A holdover mode device is illustrated. When a time synchronization source is not abnormal, a digital PLL uses a time synchronization source as its input clock, and a measurement and adjustment module calculates a variation of a frequency difference between the time synchronization source and a reference clock output by an adjustable oscillator, and builds a frequency ...