Abstract: A radio communication between central and peripheral units (LST, SUP, FZ, PAC, LSA) of a traffic guidance system which, in particular, is comprised of a master terminal (LST), vehicles (FZ) and passenger information systems (PAC) and optical signal units (LSA) to control the flow of traffic, which communicate with one another via at least two voice and two data channels (SK1, SK2, DK1, DK2) in such a way that messages are transmitted from the central unit (LST) to the peripheral units (FZ, PAC) via the first data channel (DK1) and correspondingly from the peripheral units (FZ, PAC) to the central unit (LST) via the second data channel (DK2). Further, the central and the peripheral units (LST, FZ, PAC) communicate via the first and the peripheral units (FZ) among one another at close range via the second voice channel (SK1 or SK2).

Abstract: A method and apparatus for transmitting binary data trains of 0 and 1 data bits, or combinations of these data bits over a communications network. The data bits are converted into pulses whose polarity changes from pulse to pulse, so as to enable an optimal exploitation of the transmission channel with a low error rate. The pulses generated by an apparatus of the present invention have a signal shape that produces a minimum inter-symbol interference. Processing and evaluation of the transmitted pulses are performed by a processor, so that a minimal error rate is attainable even under unfavorable transmission conditions.