Assertion: fiber optic cable's core | /r/HasProperty | either glass
Facets:
value: generally
type: DEGREE
Source sentences:
text: All fiber optic cable types are comprised of a core that transmits light, generally either glass or plastic, a cladding which reflects that light to prevent loss, and surrounded by sheathing meant to protect the core and cladding from damage.
text: The core is the middle of the cable and the glass structure.