Which component primarily protects the fiber from damage?

• A. Primary Buffer Coating
• B. Aramid Strength Members
• C. Jacket
• D. Outer Shield

Answer: (A)

The part that directly protects the delicate glass fiber from damage is the first protective layer applied around it—the primary buffer coating. This soft polymer coating acts as a cushion, absorbing small impacts and reducing stress when the fiber bends, flexes, or is handled during installation and operation. It also helps keep moisture out, which can degrade performance. Aramid strength members are there to resist pulling and provide tensile strength for the cable as a whole, not to shield the individual fiber from bending or micro-damage. The jacket and any outer shield are outer protective layers for the cable’s exterior, guarding against abrasion, moisture, and environmental exposure, but they don’t shield the fiber itself from everyday handling stresses the way the buffer coating does. So, the primary buffer coating is the main line of defense for the fiber.