Assertion: fiber optic cable's fiber | /r/HasProperty | required
Facets:
Source sentences:
text: Special fibers are required that have been coated for easier blowing through the tubes, but any singlemode or multimode fiber is available.
text: Special fibers are required that have been coated for easier blowing through the tubes, but any singlemode or multimode fiber is available.
text: Optical fibers are unidirectional for two-way communication, two fibers are required.