Radiotelephony form

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Under voice communications form refers to the way in which different radio stations can cooperate / allowed. The forms of radio communication are to be differentiated from the types of radio communication . In the bad radio four forms are involved here:

Line bus traffic

The regular service is a simple traffic shape in voice. In this one, there is AC or intercom connection between two radio subscribers. There are no other radio participants in the radio communication network used . In day-to-day operations, there is almost no use of scheduled services. A line traffic radio link can only be set up for communication between two traffic safety posts.

Star traffic

The Star Transport is a case of large radio traffic circles widespread and particularly the emergency service traffic in the form of voice. Here all radio communication centers exchange messages in a radio communication circuit with a common star head. The star head is the remote station for all radio participants and at the same time assumes a control function for them. Star traffic is generally used in emergency radio , unless otherwise specified, and used in control center radio . A distinction is made between commanded and switched star traffic. In the first procedure, the participants are not allowed to speak to one another, in the second. This is prevented by technical measures, such as B. different frequencies.


The roundabout is a form of radio communication that has proven itself in smaller radio communication circles. Here all radio stations in the traffic circle exchange messages with one another on an equal basis. Since this can very quickly lead to overloading of the radio traffic circuit , control centers , for example, can have a priority circuit that suppresses all other radio calls. Roundabouts are often used by the fire brigade, but not in civil protection, to communicate between vehicles .

Cross traffic

The cross traffic is the most complex form of the voice operation. Here, two radio stations from different radio communication groups or areas communicate with one another. For example, direct radio contact between the fire brigade and the police can be made possible. This can be done either by a relay circuit 2 (large relay circuit) or by switching channels. Cross-traffic always requires a corresponding permit and registration and deregistration on the relevant radio circuits.


  • Funk, how does it work? AEG Mobile Communication, Ulm 1992
  • Heinz Otto Geisel: Fire Brigade Radiotelephone . Die Rote Hefte, Volume 45, ISBN 3-17-014025-6
  • Michael Marten: Handbook for the radio service at the authorities and organizations with security tasks (BOS) in Germany . ISBN 3-88180-616-4
  • Radiotelephone service . PDV / DV 810.3: Service regulation for the handling of radio communications and radio training in the field of organizations with security tasks (BOS), ISBN 3-555-01326-2

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