Patent Number: 8,793,524

Title: Method and apparatus for synchronising the local time of a plurality of instruments

Abstract: A method of determining the downstream propagation time of signals from a USB Host Controller across one or more USB cables and one or more USB Hubs to a SuperSpeed USB device, including locking a clock of the SuperSpeed USB device to information that includes a first timestamp, transmitting a plurality of signals to the USB Host Controller, each of the signals containing a second timestamp indicative of a local time of the SuperSpeed USB device when the respective signal was generated by the SuperSpeed device; the USB Host Controller creating a third timestamp indicative of a time of reception from the SuperSpeed USB device; determining a time period from one or more respective time differences between corresponding second and third timestamps, the time period being indicative of a sum of a downstream propagation time and an upstream propagation time; and determining the downstream propagation time from the time period.

Inventors: Foster; Peter Graham (Parkside, AU)

Assignee: Chronologic Pty. Ltd.

International Classification: G06F 1/12 (20060101)

Expiration Date: 7/29/12018