Overview

High performance GPS grandmaster clock and network time server capable of distributing GPS Time or UTC using White Rabbit networks with sub-nanosecond accuracy over long-distance fiber links (typically hundreds of km).

The DOWR is built as a white box solution, including timing integrity monitoring of the GPS navigation data. It provides raw GPS data for the calculation of a precise antenna position and for legal traceability to UTC(k) laboratories (Figure 1).

Figure 1 – Traceability to UTC(k) laboratories evaluation setup (left image). Traceability of GPS Time from the M8F (DOWR) and M8T receivers to UTC(ROA) (right image). (Extracted from R. Píriz et al. “Practical Traceability to UTC(k) from a GNSS Timing Receiver”, ISPCS 2018, October 3rd, Geneva, Switzerland)

GPS and White Rabbit come fully calibrated from factory for the provided antenna cable. Additionally, the DOWR distributes time to other equipment via standard protocols such as PTP, NTP and IRIG-B.