Summary

Widely used underground optical fibre cables employ water-blocking materials and are maintenance free in regard to water penetration. However, water penetrated into closures/cabinets would increase the risk of significant degradation to the optical fibres and/or connectors. Recommendation ITU‑T L.315 describes the methodology for water detection in splice closures/cabinets, the fundamental requirements for water sensors and technical considerations concerning the optical time domain reflectometry (OTDR)-based water ingress monitoring and location system design.