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fiber cables

The fiber cables are named by its internal structure and diameter counted in microns. Beleave me, one fiber cable is really thin. You have problems to see it. A bulk of cables is much easier to see. However, it is very thin too.

To understand the OC mode technology :

Intermediate Reach Single-mode fiber
up to 15 km
Multi-mode fiber
up to 500 m
Long Reach Single-mode
up to 40 km
Short Reach Single-mode
up to 15 km
Multi-mode fiber
up to 2 km

single mode - multi mode

  • single mode (8.25/125 micron) for long haul up to 24.85/miles 40 km. The professionals limit this to 25 km, not to 40 km.
  • multi mode (62.5/125 microns) for short haul up to 1.24 miles/2 km.


  • 8-12 microns in diameter is for single mode fiber and
  • 50-100 microns in diameter is for multi mode fiber.

SM (single mode) Cable:

mostly indoor patch cables

Yellow Nonplenum Single Mode Premium Performance

Single Mode: (1300/1550 nm)

Max. Attenuation: (dB/km) 1.0/.75

Typ. Attenuation: (@ 23c) 0.5/0.5

Min. Bandwidth: (MHz-km) 160/500


longer outdoor cables are black

MM (multimode) Cable:

mostly indoor patch cables

Orange Nonplenum FDDI-Plus(850/1300 nm)

Max. Attenuation - (dB/km) 3.75/1.5

Typ. Attenuation - (@ 23c) 3.0/1.0

Min. Bandwidth - (MHz-km) 160/500

Generic Ggigabit Ethernet adapters are specified for cable lenght :

  • up to 550 meters with 50/125 MM fiber
  • up to 220/275 meters with 62,5/125 MM fiber

ATM fiber connections:

  • up from 5 to 15 kilometers with SM fiber
  • up to 2 kilometers with MM fiber

Cable specifications are

  • 50/125,Simp
  • 62.5/125,Simp
  • 09/125,Dupl
  • 50/125,Dupl
  • 62.5/125,Dupl


here are some links:

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