US Patent 7321558 Method and apparatus in a computer network

A method and the corresponding apparatus for multi-plexing data flows from a number of transmission units. In the method signals are sent from the transmission units and the signals are detected at inputs of a switching unit. Signals, which are detected at a point of time when no other signal is forwarded to an output from the switching unit, are forwarded to said output, whereas signals which are detected at a point of time when another signal is forwarded to said output, are blocked.