Which feature is used to prevent water ingress in fiber distribution cables?

Prepare for the Telecom Room Cross-Connection Facility Test. Utilize flashcards and multiple choice questions, complete with hints and elucidations. Gear up for your assessment!

Moisture control inside fiber cables is essential to stop water from traveling along the cable and degrading signals. The feature used to prevent water ingress is a water-blocking compound. This material is placed in the cable core and swells or gels when it encounters water, forming a barrier that blocks further moisture migration along the length of the cable. Armored coating provides mechanical protection but isn’t designed to stop water from entering. A loose tube design helps with fiber management and can work with moisture-blocking elements, but it doesn’t by itself prevent ingress. High-density fiber counts relate to capacity, not moisture protection. So the water-blocking compound is the correct choice.