CDCP Question #19: Real Exam Question with Answer & Explanation

Question

Options

• ASingle-mode cabling can use both LED and laser as a light source.
• BSingle-mode cabling is more expensive than multi-mode cabling.
• CMulti-mode cabling can cross longer distances.
• DMulti-mode cabling is more expensive than single-mode cabling.

Explanation

Single-mode cabling and multi-mode cabling are two types of fiber optic cables that differ in their core diameter, wavelength, light source, bandwidth, distance, and cost. Single-mode cabling has a smaller core diameter and uses a laser as a light source, which enables it to transmit data over longer distances and higher bandwidths. However, single-mode cabling is also more expensive than multi- mode cabling, because it requires more precise alignment and splicing, and more costly light sources and connectors. Multi-mode cabling has a larger core diameter and uses LEDs or VCSELs as a light source, which makes it cheaper and easier to install and maintain. However, multi-mode cabling also has a shorter distance and lower bandwidth than single-mode cabling, because it suffers from more modal dispersion and attenuation.

No community discussion yet for this question.