Importance

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Abstract

The method of providing a frame clock for data signals in a communications network includes determining phase positions (P1, P2, . . . ) of respective frame clock information (RT1, RT2, . . . ) of incoming data signals with respect to frame clock information (RTN) available at a switching point in at least one switching device (NK1, NK2, . . . ); storing in a memory device (SPN) in the at least one switching device (NK1, NK2, . . . ) values of all the determined phase positions; performing a phase control of the frame clock information (RTN) available at the switching point with respect to the frame clock information (RT1) of one incoming data signal; and when a loss of or interference with the frame clock information (RT1) with which a phase control was performed has occurred, performing a phase correction of the frame clock information (RT2) of another incoming data signal with the phase position of the frame clock information determined for the frame clock information (RT2) of the other incoming data signals prior to the loss or interference acting as a reference value. A switching device according to the invention is also provided for maintaining propogation delay stability, even in the case of loss or interference.

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First Claim