| 摘要 |
The present invention relates to a method, an apparatus and a network for recovery of the clock of a constant bit-rate service transported over a packet-switched network. The invention measures the inter-arrival time, Wn, between consecutive packages, filter the results through a noise reduction function (27, 52) and calculates a mean value (28) of the inter-arrival times. If the derivative (38) of the mean values is less than an error level (39) for a specified number of times (42), the frequency (18) with which the arrival buffer is polled is adjusted to comply with the frequency with which the CBR service is sent. Whenever the frequency (18) is adjusted a new period for the calculation of the mean values is started. To be able to react faster at start-up, the error level is reduced down to a specified minimum level (45) when the frequency is adjusted. |
