Patent ID: 8081664

Claim:
A method for regenerating a timing signal in digital data communication using a master/slave loop timing mode, the method comprising: transmitting a digital data stream from a master network element functioning as a master to a slave network element functioning as a slave, wherein a speed of arrival of the data stream arriving at the slave network element, expressed as a number of arriving bits per second, depends on a frequency of a reference timing signal present in the master network element, transmitting a digital data stream having an opposite direction from said slave network element to said master network element, wherein a speed of arrival of the data stream arriving at the master network element, expressed as a number of arriving bits per second, depends on a frequency of a regenerated timing signal present in the slave network element, forming, on the basis of the speed of arrival of the data stream arriving at the master network element, a master end indicator a value or a change of the value of which in relation to time indicates a frequency difference between the reference timing signal and the regenerated timing signal, forming, on the basis of the speed of arrival of the data stream arriving at the slave network element, a slave end indicator a value or a change of the value of which in relation to time indicates the frequency difference between the reference timing signal and the regenerated timing signal, and adjusting the frequency of the regenerated timing signal on the basis of a combined effect of information contained by said master end indicator and information contained by said slave end indicator.