The Radio Message System enables the relief of radio traffic on busy radio frequency channels by the application of data short telegrams for routine messages.
After more than 20 years operation, the system has shown excellent performance in practical use in Germany. Authorities and Organizations with Security Tasks (BOS) in Germany have a "Technical Directive" with an exact system description with which a standard data transfer procedure was developed. This procedure was introduced and applied by the police, fire departments and their support organizations as signaling system between mobile radio subscribers and the stationary RT radio equipment.
The RMS enables a significant reduction in time of message exchanging in RT traffic circles between mobile task forces and main control panel through the transmission of digital short telegrams instead of analogue speech for defined tactical messages and instructions.
The Radio Message System starts the operating of automated computer operated main control panel that enable a rapid overview of the mobile forces that are monitored by radio and therefore increase the efficiency.
Due to the reduced occupation duration of respective RT channels, higher channel utilization is achieved for important calls. According system concept, the Radio Message System meets the following requirements:
sufficient
transmission security,
operability of the different types of relay traffic types used by the security authorities and various incoming paths (wiring, line-of-sight radio links and carrier frequency routes),
utilization with the introduced and standardized RT installations according the BOS technical directive without interfering in the equipment,
compatibility of RMS additional equipment from different manufacturers according to the technical directives.
Status message keys enable the mobile FMS unit to transmit messages to stationary RT equipment.
In addition, the vehicle equipment includes an evaluator for incoming telegrams. Correct recognized telegrams are, depending on receipt requirement, acknowledged automatically. In general, the mobile RMS equipment expects a receipt telegram for outgoing telegrams. If a receipt is not received from the stationary radio units then telegram transmission will be repeated automatically.
For future applications, RADIODATA RMS vehicle units are suitable for the transmission of sequence telegrams according to BOS directives. With this, e.g. coded location messages can be transmitted from the vehicle equipment or if necessary can be inquired by the main control panel.
In text transmission mode, a maximum of 99 characters in a chain of sequential telegrams can be sent from the stationary side to the mobile side.
According to the various tactical requirements of the BOS, the Radio Message System works with additional equipment for radio units on the stationary and the mobile side.
Status and identification generator on the subscriber's mobile unit enable coded messages to be transmitted to evaluator of the main control panel, which are transmitted to the control panel computer for further processing after being checked for faultlessness. Optical display and acoustic signals indicate recognition of fault-free transmission.
The RMS equipment is hooked between the plug-in of microphone-headphone-combination of transceiver and handset. In general, the integrated RMS and RT units, e.g. RMS handset HA222 and its varying types are applied. Besides the standard types, RADIODATA also offers special types for motorcycles and for the concealed installation in crime police vehicles.
In addition, RADIODATA delivers combined control equipment for radio units with RMS (BG222) , as well as double control units with RMS (DBG302 and DBG220).
After amendment of the directive in summer 1999, the FMS handset HA222-COM and the HA222-GPS can receive transmitted short messages, and output these messages via serial RS 232 interface on data terminals.
