Multimode fiber

As explained in Acing the CCNA Exam: Volume 1 Fundamentals and Protocols

Multimode fiber is optical fiber that carries multiple propagation modes and is generally used for shorter-distance links.

Multimode fiber (MMF) is a fiber-optic cable with a wider glass core that carries light along multiple angles, or modes. LED transmitters send the light, which reflects from the cladding. MMF typically supports distances of several hundred meters. section 3.4.1

Figure 3.10 Light travels down an MMF cable at multiple angles (modes), whereas light travels down SMF cables at a single angle.

Compare multiple light paths in MMF with the single light path used by single-mode fiber. section 3.4.1

Network infrastructure link

Use MMF for a fiber link between network infrastructure devices on nearby floors or in the same building. Its LED-based SFP transceivers cost less than the laser-based transceivers used with single-mode fiber, but its distance is limited to hundreds of meters. section 3.5

How Acing the CCNA Exam: Volume 1 Fundamentals and Protocols covers it

How deep it goes

Defines the core, cladding, modes, transmitters, and typical distance, while stopping short of detailed standards.

Examples

Uses light-path diagrams and links between network devices on different floors or in different buildings.

What it assumes

Assumes basic network connections and introduces fiber cores, cladding, optical signals, and propagation modes.

What you can do after

Evaluate MMF against single-mode fiber by comparing distance limits, light sources, and transceiver costs.

How it connects

Links multimode fiber with fiber-optic cable, single-mode fiber, LED transmitters, laser transmitters, and SFP transceivers.

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Related concepts

• single-mode fibercontrasts with · Single-mode fiber is optical fiber designed to carry a single propagation mode over relatively long distances with low dispersion.
• fiber-optic cablekind of · A fiber-optic cable is a communications cable that transmits data as light through one or more optical fibers.

This explainer was generated by Manning's knowledge graph from the text of Acing the CCNA Exam: Volume 1 Fundamentals and Protocols. The section links point to the parts of the book it draws on.