10 Gigabit White Rabbit: sub-nanosecond timing and data distribution
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AuthorJiménez López, Miguel; Girela López, Francisco; López Jiménez, José; Marín López, Emilio; Díaz, Javier
Institute of Electrical and Electronics Engineers (IEEE)
White rabbit10 Gigabit EthernetHigh accuracy synchronizationIEEE 1588Timing distribution
Jiménez-López, M., Girela-López, F., López-Jiménez, J., Marín-López, E., Rodríguez, R., & Díaz, J. (2020). 10 Gigabit White Rabbit: Sub-Nanosecond Timing and Data Distribution. IEEE Access, 8, 92999-93010. [DOI: 10.1109/ACCESS.2020.2995179]
SponsorshipEuropean Union (EU) 725490; H2020 ASTERICS 653477; AMIGA7 RTI2018-096228-B-C32
Time synchronization is a critical feature for many scientific facilities and industrial infrastructures. The required performance is progressively increasing everyday, for instance, few tens of nanoseconds for Fifth Generation (5G) networks or sub-nanosecond accuracy on next family of particle accelerators and astrophysics telescopes. Due to this exigent accuracy, many applications require specific timing dedicated networks, increasing the system cost and complexity. Under this context, the new IEEE 1588-2019 High Accuracy (HA) default profile is intensively based on White Rabbit (WR) which can provide sub-nanosecond accurate synchronization for Ethernet networks. However, current WR solutions have not been designed to work properly with high data bandwidth delivery services even in 1 Gigabit Ethernet (GbE) links. On this contribution, the authors propose a new architecture design that enables WR and, consequently, the IEEE 1588-2019 HA profile to be deployed over 10 GbE links solving the already identified data bandwidth problem. Furthermore, this work addresses different experiments needed to characterize the system performance in terms of time synchronization and data transfer. As final result, this contribution presents for the first time in the literature a new WR system which allows high bandwidth data exchange in 10 GbE networks while providing sub-nanosecond accuracy synchronization. The proposed solution maintains the time synchronization performance of existing WR 1 GbE devices with significant advantages in terms of latency and data bandwidth, enabling its deployment in applications that integrate data and synchronization information in the same network.