Patent ID: 7751447

Claim:
A method of synchronizing a first and a second time base unit in a receiving station, the method comprising the steps of: awakening the first time base unit from a sleep-mode to an operational-mode, where in sleep-mode the first time base unit uses timing signals at a first clock rate from a first reference clock; after the first time base unit is awoken and while the first time base is in operational-mode, receiving timing signals at a second clock rate from a second reference clock at the first time base unit, wherein the second clock rate is higher than the first clock rate, and wherein the first time base unit uses the timing signals at the second clock rate in operational-mode; performing a calibration of the first time base unit, independently of the second time base unit, after the first time base unit is awoken based at least on the timing signals at the second clock rate from the second reference clock, resulting in a calibrated first time base unit; and adjusting the second time base unit based at least on the calibration of the first time base unit to synchronize the second time base unit with the calibrated first time base unit, wherein the second time base unit is communicatively isolated from the first reference clock and communicatively coupled to the first time base unit and the second reference clock.