♦♦Multimode Fiber-Optic Cable♦♦

♦♦Multimode Fiber-Optic Cable♦♦

• Multimode fiber (MMF) optic cable is usually the fiber-optic cable used with networking applications such as ATM, Gigabit Ethernet, a10 Gigabit Ethernet, 40 Gigabit Ethernet, and 100 Gigabit Ethernet that require fiber optics for both horizontal and backbone cable.
• Multimode cable allows more than one mode (a portion of the light pulse) of light to propagate through the cable.
• Typical wavelengths of light used in multimode cable are 850 and 1,300 nanometers.
• There are two types of multimode fiber-optic cable: step index or graded index.
• Step-index multimode fiber-optic cable indicates that the refractive index between the core and the cladding is very distinctive.
• The graded-index fiber-optic cable is the most common type of multimode
  fiber.
• The core of a graded-index fiber contains many layers of glass; each has a lower index of refraction going outward from the core of the fiber.
• Both types of multimode fiber permit multiple modes of light to travel through the fiber simultaneously.
• Graded index fiber is preferred because less light is lost as the signal travels around bends in the cable; therefore, the cable offers much greater bandwidth.
• The typical multimode fiber-optic cable used for horizontal cabling consists of two strands of fiber (duplex); the core is either 50 or 62.5 microns (micrometers) in diameter, and the cladding is 125 microns in diameter (the measurement is often simply referred to as 50/125 micron or 62.5/125 micron).

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Credits: Mr. hmed Fawzy Shaaban, CCNA, RCDD®’s Post