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AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorDaniele Stracca
Estimating the term…
A method for the clock recovery in transport in constant bit rate channels(CBR), especially suitable for implementation of the adaptation layer of the asynchronous transfer mode(AAL) which comprises: the use of means for temporarily storing data at receiving end; the use of a clock frequency, with which data are polled out from said storing means, and calculation of a series of time differences(Zk), characterized in that said difference series is sent to a control block where the instant value(Zk) of said differences is multiplied by the value of its own index(k); it is subsequently compared to the sum of the previous values(Zk) considered up to the moment(k−th value); and it is checked that the absolute value of the differences outcoming from said comparison is less of the error(err) multiplied by the index(k−1) of the previous value(Zk) and by the absolute sum value(sum). The invention refers also to an apparatus to carry out such a method.
A method for the clock recovery in transport in constant bit rate (CBR) channels, for implementation of the adaptation layer of the asynchronous transfer made (AAL), comprising the steps of:
An apparatus for the clock recovery in transport in constant bit rate (CBR) channels, for the implementation of the adaption layer of the asynchronous transfer mode (ATM), comprising memory means, apt to temporarily store data at receiving end, a clock set (18, 19) to determine the frequency of data polled out from said memory means, calculation means (26) to calculate time differences between two consecutive incoming packets, means (27) to reduce noise and means (28, 34) to adjust the frequency at which said clock operates, characterised in that it includes a control block (28) which is adapted to carry out the multiplication of the present value (zk) of said differences by the index (k) of the same present value (zk), a subsequent comparison with the sum (sum) of the values (zk) considered up to the moment (up to k−th value), and a check that the absolute value of the difference, resulting from said comparison, is less than the error (err), multiplied by the index (k-1) of the previous (zk) value (k-1−th value) and by the absolute value of the sum (sum).
Dependencies are inferred from the claim text.