Tunnel Radio System for the A44 Spitzenberg and Trimberg Tunnels

The objective was to ensure reliable radio coverage within the tunnels. For this purpose, the digital radio system for authorities and emergency services (dBOS) was installed, which is used by the police, fire brigade, and rescue services. In addition, radio broadcasting (FM and DAB+), the digital radio system of the motorway maintenance authority, and a backup radio system were implemented to provide communication in case the primary radio network fails.

Of particular importance is the ability of the police and emergency services to communicate continuously and reliably throughout both tunnels. This applies to the entire length of the tunnels and is ensured using the standard digital radio devices (TETRA) employed by the emergency services.

Services in Detail

• Installation and commissioning of the digital radio system (dBOS) in all tunnel tubes, cross passages, and operational buildings 
• Installation of 6 head-end stations and 4 tunnel radio base stations
• Connection to the PiKo base station in the Trimberg tunnel
• Tube‑separated voice input for the FM radio system
• Provision of the digital operating radio system
• Fault and status messages are transmitted to the central control system 
• Ensuring twelve hours of operation in the event of a power failure
• Integration of fire brigade building radio control panels 
• Proof of radio coverage and acceptance of the system together with the users (Authorized Body, Fire Brigade)