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Fiber optic links for CCTV: when 100 meters is not enough

Media converters, SFP modules, single-mode vs multi-mode fiber.

Select Security1 min read

Fiber patch cables with SFP modules in a switch

When fiber is needed

A copper Ethernet segment is limited to 100 meters. In large warehouses, plants and links between buildings, fiber covers much longer distances and is immune to electromagnetic interference and lightning-induced surges.

Key components

  • Media converter: converts copper Ethernet to fiber.
  • SFP module: plugs into a switch SFP port.
  • Single-mode: long distances (kilometers).
  • Multi-mode: short distances, typically within a building.

Important rules

  1. Modules at both ends must match (wavelength, fiber type, connector).
  2. Single-fiber (BiDi) modules are used in pairs with opposite wavelengths.
  3. Respect the minimum bend radius of the cable.
#Network#Fiber#CCTV
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