Fibre distribution
Digital CPRI link between Master and Remote Units.
Prodotti
Digital radio system via optical fibre for tunnels
TP-DAB is Teleproject's digital radio system for tunnels: it distributes FM, DAB+, and TETRA signals over optical fibre from the Master Unit to the Remote Units installed along the tunnel, with per-channel selective repeating and multi-zone emergency break-in.
FM · DAB+ · TETRACPRI optical fibreMulti-zone break-in30 dBm/channelCE
The product
Every radio signal, inside the tunnel.
TP-DAB is Teleproject's digital radio system for bringing radio signals into tunnels and keeping them active at all times. A Master Unit receives FM, DAB+, and TETRA signals outside and distributes them in digital format over optical fibre (CPRI) to the Remote Units installed along the tunnel, which rebroadcast them on the radiating cable. A single unit integrates per-channel selective repeating, break-in modulators, and management, eliminating the analogue combiners found in traditional systems.
In an emergency, TP-DAB interrupts the programming and broadcasts an alert message — from a pre-recorded file, a live voice announcement, or a VoIP call — on the selected tunnel zones, independently for each bore. The architecture is redundant, with automatic remapping of resources to a backup Master Unit, and scalable by licence.
4FM · DAB+ · TETRA · VHF
radio technologies
32 / 12FM · DAB+ ensemble
repeater channels
16CPRI
fibre connections
30dBm
output power per channel
What it does.
Rebroadcasts FM, DAB+, and TETRA signals received outside into the tunnel and, in an emergency, interrupts the programming to broadcast an alert announcement.
Multi-technology repeater
Receives FM, DAB+, and TETRA signals outside and rebroadcasts them inside the tunnel, channel by channel, with sub-band filters and automatic gain control.
Emergency break-in
In an emergency, interrupts the programming and broadcasts an alert announcement on FM and DAB+ directly to car radios, with independent zones for each tunnel bore.
Fibre-optic distribution
A Master Unit feeds the Remote Units along the tunnel via optical fibre (CPRI): digital signal, no degradation, simple cabling.
How it works.
A Master Unit receives signals outside and distributes them digitally over optical fibre to the Remote Units along the tunnel, which rebroadcast them on the radiating cable, with independent break-in zones for each bore.
- Master Unit
- Riceve all’esterno FM, DAB+, TETRA e altri segnali e li distribuisce in digitale.
- Remote Unit
- Riceve sulla fibra e ridiffonde la radio sul cavo radiante.
- Fibra ottica · CPRI
- Trasporto RF digitale: nessuna degradazione del segnale.
- Cavo coassiale
- Collega le Remote Units ai cavi radianti.
- Cavo radiante
- Diffonde la radio lungo l’intera tratta in galleria.
- Hybrid 3 dB
- Divide il segnale su due cavi radianti.
In the field
From the technical room to the tunnel.
The Master Unit lives in the technical room at the tunnel entrance. The Remote Units are distributed along the tunnel and feed the radiating cable in both bores.
System features.
Fibre distribution, per-channel repeaters, multi-zone break-in, audio sources, management, and redundancy — all in a single unit.
Per-channel repeater
FM, DAB+, TETRA, TETRAPOL, VHF, DMR.
Multi-zone break-in
Emergency announcement on FM and DAB+, independent for each tunnel bore.
Audio sources
Pre-recorded files, live voice announcement, or VoIP.
Radiating cable monitoring
Pairs with the TP-CCV2 for radiating cable continuity monitoring.
Management and redundancy
Web interface, SNMP, and backup Master Unit.
Real-time emergency announcement.
The break-in requires no app or on-board device: the announcement reaches listeners on the same radio channel they are already tuned to. From the Respondr console, the operator can send pre-recorded or live messages, broadcast on FM and DAB+ in the selected bores.
- 01
From the Respondr console
The operator selects the bores and starts the message.
- 02
Pre-recorded or live
A ready-made message from the library, or a live voice announcement.
- 03
Broadcast in the tunnel
TP-DAB interrupts the radio and broadcasts the announcement in the selected bores, on FM and DAB+.
Key features.
Nine features cover the complete cycle, from fibre distribution to in-tunnel broadcast, through to emergency break-in.
- Digital distribution over optical fibre
RF signals travel in digital format over optical fibre (CPRI) from the Master Unit to the Remote Units: no signal degradation and a better signal-to-noise ratio than analogue links.
- Per-channel selective repeater
Repeats and reconditions FM, DAB+, TETRA, and TETRAPOL channel by channel (up to 32 FM channels and 12 DAB+ ensembles), with sub-band filters and automatic gain control.
- Multi-zone emergency break-in
Interrupts the programming and broadcasts the alert announcement on FM and DAB+, with independent zones for each tunnel bore.
- Flexible audio sources
Sources can be a pre-recorded file, a live voice announcement, or a VoIP call, with the option of also replacing the text on the car radio display.
- Master and Remote architecture
A Master Unit feeds multiple Remote Units along the tunnel in star, daisy-chain, or redundant topology, with up to 16 optical connections per device.
- Built-in redundancy
If a link fails, the system automatically remaps radio resources to a backup Master Unit, keeping the service active.
- Radiating cable monitoring
For radiating cable continuity, TP-DAB pairs with TP-CCV2, the Teleproject system dedicated to radiating cable monitoring in tunnels.
- Web management and licence scalability
Configuration and supervision from an integrated web interface, with SNMP and GPIO for integration. Features are licence-activated: you pay only for what you need.
- Respondr integration
The emergency break-in can also be triggered from the Respondr console, Teleproject's control room system: from the same position, the operator selects the bores and sends the announcement, pre-recorded or live.
06 · Technical specifications
Technical specifications.
01 · Architecture and radioMaster + Remote · CPRI
- Broadcast FM / DAB+
- FM 87–108 · DAB 174–240 MHz
- Amplification bands
- VHF 70–88 and 140–174 · UHF/TETRA 380–470 · others up to 1000 MHz
- Repeater channels
- 32 FM · 12 ensemble DAB+
- RF inputs
- Up to 4 · 70 MHz per input
- RF outputs
- Up to 4
- Output power per channel
- Up to 30 dBm
- Input sensitivity
- −100 … −20 dBm
- Signal transport
- Digital RF over fibre (CPRI)
- Optical connections
- Up to 16 (LC) · daisy-chain, star, redundant
02 · Break-in and managementMulti-zone
Announcement and supervision
The emergency announcement replaces both the audio and the text on the car radio display, with independent zones for each tunnel bore. On DAB+, the break-in can also send an image displayed on the car radio screen. Audio sources are a pre-recorded file, a live voice announcement, or a VoIP call. Supervision is handled by an integrated web interface with SNMP and GPIO for integration and event logging; the architecture is redundant, with automatic remapping of resources to a backup Master Unit.
03 · Hardware and powerForm factor · Power · Environment
Form factor
19" rack or outdoor enclosure
- Rack
- 19" · 2U
- Outdoor
- Case IP65
- Weight
- ≈ 6–8 kg
Power supply
Rete 230 VAC · 48 VDC
- Mains
- 230 VAC
- DC input
- 48 VDC
- Redundancy
- Dual AC/DC input
Environment
−20 … +55 °C
- Temperature
- −20 °C / +55 °C
- Humidity
- 10–90% non-condensing
- Cooling
- Passive or fan-cooled
04 · ComplianceCE · ETSI EN
- Marking
- CE
- Radio equipment
- ETSI EN 300 086
- Electromagnetic compatibility
- EN 301 489
- Radio links
- EN 302 217
Radio and break-in in the tunnelFrom radio amplification to emergency alert.
From radio amplification to emergency alert.
One system.
Design, installation, and maintenance of the tunnel radio system: continuous reception and an always-ready alert channel. Twenty years of experience, over 100 tunnels.