Multimode Fiber Optics: Short-Range, Cost-Effective Connectivity | Comptia A+ study

Описание: Explore the defining characteristics of multimode fiber optics, a popular cabling solution for shorter-distance network connections within buildings and campuses. Learn about its use of LED or VCSEL light sources, its typical transmission distances (up to 2km for slower speeds, hundreds of meters for higher speeds), and its lower cost compared to single-mode fiber.

Characteristic Traits of Multimode Fiber Optics:

Transmission distances of up to 2km: While common for older, slower (e.g., 100Mbps) multimode applications, newer high-speed multimode (e.g., 10Gbps, 40Gbps, 100Gbps) has shorter distances, ranging from a few hundred meters down to tens of meters depending on the fiber type (OM1, OM2, OM3, OM4, OM5) and speed. However, 2km for some multimode applications is still a valid characteristic for its longer-range capabilities at lower speeds, distinguishing it from copper's 100m limit.
Uses LED as the source of light: While newer, higher-speed multimode often uses VCSELs (Vertical-Cavity Surface-Emitting Lasers), LEDs were historically and are still used for many multimode applications due to the fiber's larger core size.
Less expensive than single-mode fiber optics: Multimode fiber components, particularly the transceivers (optics), are generally less expensive than those for single-mode fiber, making it a more cost-effective choice for shorter distances.
Incorrect Options Explained:

More expensive than multimode fiber optics: This describes single-mode fiber.
Transmission distances of up to 100 km: This describes single-mode fiber, which is designed for very long-distance transmission.
Uses laser as the source of light: While modern multimode does use VCSELs (a type of laser) for higher speeds, LEDs are also a characteristic light source. Single-mode exclusively uses lasers.
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