In the WR network, a dedicated time and frequency system is set up to deliver and distribute the time signal from WR switches or WR nodes locally. Accordingly, the design of a flexible, transferrable, and extensible time and frequency system is required for complementing existing WR equipment and WR networks. Here we propose the concept of “universal module”. Based on the universal modules, a variety of devices and TF system can be developed. In particular, three applications are demonstrated in this paper. Finally, the first measurement results of the integrated devices will be demonstrated in this paper.

A nanosecond-accuracy, scalable, multi-point time- and frequency dissemination has been set up in an existing DWDM optical fiber network spanning approximately 200 km, using the White Rabbit (WR) Precision Time Protocol (PTP). Presented novelties in this paper are: a performance study of 5 cascaded WR switches allowing a wide fan-out; reference delay compensation ensuring that the time received by the user is synchronized with the reference timescale within a few nanosecond offset; experiments with a master clock priority algorithm for redundant operation and experimental results of hold-over performance.