Communications Specialties FIBERLINK XRD-8050/RK Manuel de l'utilisateur - Page 13

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OPERATING CONSIDERATIONS FOR

FIBER OPTIC CABLE

The XRD-8050 may be supplied with ST, FCPC or single-mode ST type optical

connectors and will operate with most common fiber optic cables.

Since the XRD-8050 can be provided for operation at a wavelength of 850nm or

1300nm, the fiber optic cable employed should be chosen so that it is optimized

for operation at the appropriate wavelength.

When using any type of fiber optic cable be certain to not cause excessive

strains especially at the cable-to-connector junction. Also, do not subject the

cable to sharp bends or pull around sharp corners. Whenever possible, service

loops or extra slack should be provided in any installation. While excessive

precautions are not necessary, fiber optic cable does contain thin, fragile strands

of glass and as such should be treated with moderate care.

Notes Regarding Fiber Optic Cable

Multimode fiber optic cable contains an optical fiber with a light carrying "core"

that is only 0.0025 inches (62.5u) in diameter. Single-mode fiber optic cable has an

even smaller "core", only 0.00032 to 0.0004 inches (8-10u). This is smaller than a

human hair! Any minute particle of dirt or dust can easily block this fiber from

accepting or radiating light. As a result, the key word is cleanliness. Always use the

dust caps provided with optical connectors whenever they are exposed to air. Also,

always try to gently clean the tip of an optical connector with alcohol whenever

dust is suspected.

Mechanical butt splices or optical feedthroughs must be installed properly. Multi-

mode devices will not operate properly with single-mode connectors even though

they may look the same. Using the wrong device can easily add more optical

attenuation than specified with the result that system performance can be compromised.

Attempting to use multimode fiber with a single-mode system will usually result in

overloading of the fiber optic receiver with the result that the system will produce

distorted output signals or simply not work at all. Using single-mode fiber with a

multimode system will result in not enough light reaching the receiver with the

result that the transmission distance will be greatly reduced and in some cases, the

system will not operate at all.

As a result, always use the fiber optic cable the system is specifically designed for.