CALCULATING TIME OFFSET

摘要

A slave device sends a first test signal via a downlink optical waveguide to a master device and recording a first transmission time, receives the first test signal looped back by the master device via the downlink optical waveguide and records a first reception time, and calculates a downlink delay time based on the first transmission and the first reception times. The slave device sends a second test signal via an uplink optical waveguide to the master device and records a second transmission time, receives the second test signal looped back by the master device via the uplink optical waveguide and records a second reception time, and calculates the uplink delay time based on the second transmission and the second reception times. Then, the slave device calculates a time offset between the master device and the slave device based on the downlink and the uplink delay times.

主权项

1. A method comprising:
a slave device obtaining a downlink delay time by:
sending a first test signal via a downlink optical waveguide to a master device and recording a first transmission time of the first test signal;receiving the first test signal looped back by the master device via the downlink optical waveguide and recording a first reception time of the first test signal;calculating the downlink delay time based on the first transmission time and the first reception time; the slave device obtaining an uplink delay time by:
sending a second test signal via an uplink optical waveguide to the master device and recording a second transmission time of the second test signal;receiving the second test signal looped back by the master device via the uplink optical waveguide and recording a second reception time of the second test signal;calculating the uplink delay time based on the second transmission time and the second reception time; and the slave device calculating a time offset between the master device and the slave device based on the downlink delay time and the uplink delay time.