Which high-precision clock to choose for high performance and competitive OBN?

Two different high-precision clock technologies are available for OBN manufacturers: OCXO clocks and CSAC clocks. The CSAC clock is being pushed by the oil majors, although it is extremely expensive. Technological progress is being made by the OCXO manufacturers. Their attractive price and their better market availability make them an attractive compromise for the OBN manufacturers who wish to segment their OBN product offerings besides their CSAC-based OBN. OCXO and CSAC clocks’ key parameters and performances are reviewed below. Their advantages and limitations, both technically, economically and strategically, are studied.