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CS0037 – Optirep – Grotte de Niaux
DMR private network relied to a
telephonic public network
Niaux Cave
May 2016
Commissioning of telephony
relied to a DMR network.
FO-RF OPTIREP® 400 MHz system
To insure underground tourism protection, but also to guarantying personal
security during interventions, Ariege country council entrusted Selecom for the
supply, the installation and the commissioning of a new system of communication,
relaying the indoor telephone network of Niaux Cave, and especially in all the
galleries utilized by public, around 1000 meters.
With thermal and environmental constraints, SELECOM choose its OPTIREP®
The deployed solution is composed of:
 A cabinet 19”;
 A DRM/phoning interface relay;
 An optic rack for monitoring;
 3 FO-RF OPTIREP® 400 MHz remote repeaters (24 dBm for
repeaters located at the gallery tips and 37 dBm for the central
 Omnidirectional and directional antennas ;
 DMR mobile radios 4RP indoor and outdoor of the cave.
SELECOM - ZA Alfred Sauvy - 66500 Prades - France
Tél : +33 4 68 05 34 00 - Fax : +33 4 68 05 21 46 - Mail : [email protected] – Web :