Paging Intercom P300 for Tunnels

• Paging intercom during construction of vehicular tunnels, mining tunnels, deep sewer, etc., similar to a cable radio system, does not require a telephone exchange APBX, it only needs a pair of telephones cable 2 x18 awg, as the Tunel becomes longer just add cable and intercoms.

• From 2 to 50 telephones can be connected on 2 x 18AWG (0.9mm2) cable till 15km in a tunnel.

• The intercoms are powered by a central 12 VDC source and have a backup battery of 4 hrs. Optionally intercoms are energized with alternate voltage to 110 / 220VAC for tunnels bigger than 15 km

• They use simplex communication through open voice communications from 110 dB to 1 m.

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