Fresh Air Base Station

The Fresh Air Base station is an intrinsically safe transceiver device that is a component of the emergency response support system. The base station provides communication in mine workings during rescue operations. Fresh Air Base enables the underground Rescue Operation Manager (ROM) to communicate by wire with the action manager on the surface. In cooperation with a mPhone radio, it enables the underground action manager to communicate wirelessly with rescue teams.

Being a node of the radio network it provides data transmission and communication during the rescue operation. The Fresh Air Base also allows the Rescue Operation Manager to monitor the operation of individual elements of the system to support the rescue operation. During the underground excavations, the device can operate on a built-in secondary cell battery or be powered externally.

Underground communication using mPhone can be simultaneously heard by the ROM on the surface (LISTENING/SILENCE switch). Communication between the ROM and the BASE is not broadcasted to the radiotelephones.

Main features:

  • explosion proof design
  • 16 hours of battery backup
  • can be powered by an IS power supply
  • additional 16 hours of external battery unit

With the Rescue Operations Office on the surface:

  • using the regular twisted-pair telephone line to PBX with a dial function
  • using dedicated twisted-pair leased line
  • using single-mode fiberoptic (op is)

With the rescue teams:

  •  using mPhone radiotelephones over wireless mesh radio infrastructure


The Fresh Air Base Station is available in two versions:

  • intrinsically safe – the device complies with ATEX and MASC restrictions and can be used in hazardous areas
  • non-intrinsically safe