| 摘要 |
A transit exchange in a digital telecommunications network has a signal controlled oscillator 15 for which the control signal is dependent upon the joint weighted phase difference between the clock of the transit exchange and the clocks of the other exchanges. In order to avoid phase jumps a signal corresponding to the phase difference is sampled 2, the sampled values are differentiated 3, the differentiated values are compared 6, 7a, 7b with a limit value, the exceeding of which produces a phase jump, and in the event of this limit value being exceeded a signal with the control signal's highest value but with the opposite sign is added 9 in order to create a compensating signal, the compensating signal is added 9 to the differentiated value and the differentiated value is totalled 10, after any weighting by corresponding differentiated values from the comparison with the phase of the other links, and the total value is integrated 11 in order to obtain a resulting control signal. <IMAGE> |
