JTSxxHC-Serie is a (voltage controlled) temperature-compensated crystal oscillator with sophisticated features to meet the requirement for the reference clock of Stratum 3. Its comprehensive compensation technique can guarantee very tight stability over a wide range of operating temperatures. The short- and long-term aging is well controlled to only allow a total +/-4.6ppm frequency excursion with all defined environmental variations and up to 20-year duration. The  3.3V (VC)TCXOs with an HCMOS output in a 7050 / 5032 package are compliant with ITU-T G.8262 Options 1 & 2 and Stratum 3 GR-1244 Core & CR-253-Core. It is dedicated well to synchronous Ethernet equipment clocks (EEC) and synchronous OTN equipment clocks (OEC).

5G or even 6G era needs more strict synchronization in a network to sustain the functionalities, especially for eMBB (enhanced mobile broadband) and URLLC (Ultra Reliability and Low Latency Communication).

IEEE-1588v2 protocol and Synchronous Ethernet are two essential solutions to deliver the clock accuracy from UTC to each Stratum level in a synchronous hierachy.

The TCXOs JTS75HC and JTS53HC perform a compliant holdover capability letting the clock integrity be kept up for at least as long as the Stratum 3 standard clock when the timing signal of master sources absents.