FM RBBI Solution
The FM radio Re-broadcast and Break-in System (FM RBBI) is a highly effective tool for entertainment and emergency management in road tunnels, in-building and large underground stations. The system repeats normal FM broadcast with RDS data but in an emergency, can replace the content with real-time voice or prerecorded audio announcements to notify the public of emergency events like fire, accident or the need to evacuate the incident area.
The operating principle for the break-in is to substitute each of the re-broadcasted FM channels with real-time voice, RDS data or up to 100 prerecorded emergency advisory messages in different languages.
For robustness and high system availability, the RBBI system can be designed with
Geographical redundancy, with active system in Main Operation Control Center (MOCC) and hot back-up in Alternate Operation Control Center (AOCC)
N+1 redundancy for each language group of FM radio channels
Duplicated work stations at both MOCC and AOCC for source selection, break-in voice announcements and playback of up to 100 prerecorded messages
Fail-safe RF switch for source selection with manual by-pass
Monitoring of off-air RF signals and audio announcements
Interface to external management system for system monitoring and control
For long tunnels and large underground complexes where auxiliary RF distributed antenna system such as leaky coaxial cables LCX and indoor antennas are installed to improve RF coverage and overcome blind spots, the RBBI signals can be distributed through outdoor rated (both IP65 and IP66 versions are available) RF to fiber optic converters and amplifiers located at strategic locations to boost and inject the signals, ensuring seamless coverage throughout the service area.
