Patent ID: 6026074
Filing Date: 2000-02-15
Classification: H04J,H04L

Abstract:
A method for synchronizing transmissions at a constant bit rate in asynchronous transfer mode (ATM) networks, the method comprising:converting a data stream at a constant bit rate on a transmitter side into an ATM cell stream by an interworking unit;providing a receiving device comprising an input buffer, a receiving device interworking unit, a time base and a controller;storing ATM cells, on the receive side, in the input buffer after transmission;assigning the ATM cells, in the input buffer, a time stamp T.sub.S which correlates with the time of its reception;forming a data stream of data stored in the ATM cells, at a constant bit rate, with the receiving device interworking unit, at a time T.sub.A, delayed with respect to the reception time;prescribing a desired delay time value t.sub.V for a delay time, said desired value t.sub.V being greater than a variation of the transmission time delay time variation (DTV) of the ATM cells from the transmitter to the receiver;determining an actual delay time by forming the difference T.sub.A -T.sub.S ;producing an error variable t.sub.R =t.sub.V -(T.sub.A -T.sub.S) and transferring the error variable to said controller;generating a correcting variable at the controller from the error variable t.sub.R ;transferring the correcting variable to said time base; andadjusting a clock frequency of said time base according to said correcting variable, counter to a deviation.