Which core design uses dry water-blocking to prevent water ingress?

Study for the BICSI OSP Design Test. Prepare using multiple choice questions, with hints and explanations to enhance understanding. Succeed in your exam journey!

Water ingress protection in OSP cables is addressed by different blocking methods. Dry water-blocking uses dry water-swellable materials placed in the cable layers that swell when they contact water to form a barrier, preventing water from migrating along the cable. This approach avoids gels or liquids inside the cable, making manufacturing, handling, and field installation cleaner and more reliable. The other options rely on gels or other liquid-blocking media, or lack blocking material altogether, and do not use the dry blocking approach. Therefore, the design that uses dry water-blocking is the dry water-blocked core design.