Two closets in a government building are 150 meters apart and the link must be fiber. The team wants the short-reach fiber type used inside buildings, not a long-haul type. Which medium fits?
Select an answer to reveal the explanation.
Short Explanation
Inside one building, a 150-meter run is a walk down the hall for you, not a trip between cities. The fiber type built for that shorter indoor reach is multimode. Copper's standard channel stops at about 100 meters, and a twinax patch is a rack-length cord, so neither one is the 150-meter answer.
Full Explanation
Multimode fiber uses a larger core and is the short-reach fiber type for links inside a building and across a campus floor. One hundred fifty meters between closets is that kind of run, and the team asked for the short-reach type rather than a long-haul type. Single-mode fiber is the long-reach type, with a smaller core, used for long building-to-building and carrier spans. A run past 100 meters does not automatically become a long-haul link that requires single-mode. A Category 6 copper channel follows the 100-meter channel limit for twisted pair, so 150 meters is too far for that copper channel. Direct-attach twinax is a short copper assembly used inside a rack or between adjacent racks, typically a few meters, not a 150-meter closet-to-closet run. Exam caveat: single-mode will light a short indoor path, and the exam contrast still treats multimode as the short-reach choice when the stem asks for that type. Operational check: confirm both ends use multimode optics of the same wavelength, then test the loss against the link budget before you accept the run.