Optical exchange method, apparatus and system for facilitating data transport between WAN, SAN and LAN and for enabling enterprise computing into networks

Transmission system including a synchronizer for forming a multiplex signal, a device for conveying the multiplex signal, and a desynchronizer which comprises at least:

• a buffer store for buffering transport unit data contained in the signal;
• a write address generator for controlling the writing of the data in the buffer store;
• a control arrangement for forming a control signal for the write address generator from the signal;
• a read address generator for controlling the reading of the data from the buffer store;
• a difference circuit for forming difference values between the addresses of the write and read address generators,
• a generating circuit for generating from a difference signal a read clock signal which is applied to the read address generator,
• a correction circuit, and
• a combiner circuit, wherein the control arrangement is provided for determining the offset of at least one transport unit in the signal and for applying the determined offset to the correction circuit which correction circuit is used for forming the phase difference between a lower-order transport unit and a higher-order transport unit, and in that the combiner circuit is provided for providing the difference signal to the generating circuit by combining a correction value resulting from the subtraction of the two phase differences, and a difference value from the difference circuit.