A time transfer link consisting of PTP White Rabbit (PTP-WR) devices can transfer time with sub-nanosecond accuracy. Originally White Rabbit devices were calibrated as a set of two devices. Progress in calibration makes individual absolute calibrated PTP-WR devices possible. This enables exchange of PTP-WR devices without the need for expensive in-situ end-to-end calibrations. Electrical absolute calibration is the basis of absolute calibration. It calibrates the time relationship between the internal timestamp and the external electrical time reference plane. In this paper we examine the electrical time transfer accuracy when a link is setup using electrical absolute calibrated PTP-WR devices calibrated by different laboratories.

翻译：由PTP White Rabbit (PTP-WW) 装置构成的时间传输链路可以以亚纳米秒精确度转换时间。 白兔装置最初被校准为两套装置的一组。 校准方面的进展使得个人绝对校准PTP-WW装置成为可能。 这使得PTP-WW装置的交换无需昂贵的现场端到端校准。 电气绝对校准是绝对校准的基础。 它校准了内部时间戳与外部电子时间参照平面之间的时间关系。 本文中我们研究了在使用由不同实验室校准的电源绝对校准PTP-WW装置建立连接时, 电子时间传输的准确性。