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This paper presents the establishment and performance evaluation of White Rabbit (WR-PTP) and Precision Time Protocol (PTP) over a 12 km round-trip optical fiber link based on a telecom network, implemented at the Council of Scientific and Industrial Research – National Physical Laboratory (CSIR–NPL), New Delhi, India. Precise time and frequency synchronization is essential for a wide range of applications, including navigation, power grid management, mobile communications, and scientific research. The objective of this study is to strengthen national capabilities in terrestrial time and frequency transfer by assessing the feasibility and performance of WR-PTP and PTP over existing telecommunication infrastructure. A comparative analysis of both technologies was conducted using a common testbed of telecom network to ensure consistency. The WR-PTP system achieved a time transfer uncertainty of approximately in picoseconds between the Grandmaster and slave nodes, while PTP demonstrated a performance of sub nanoseconds between its Grandmaster and client. This work highlights the potential of both technologies and lays the foundation for future deployment over large-scale Dense Wavelength Division Multiplexing (DWDM)-based telecom networks.
