Communications Specialties Pure Digital Fiberlink 7231 Manuale d'uso - Pagina 10

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OPERATING POINTERS AND TROUBLESHOOTING

Optical Fiber:
The 7231 receiver card operates with most multimode (MM) and
single mode (SM) optical fibers. All models within the 7220 Series use
the same 1310 nm wavelength and optics for transmitting over multi-
mode or single mode fiber, but be aware that the type of fiber you use
will affect the system's loss budget and the maximum transmission dis-
tance that it can support.
Troubleshooting:
Multimode fiber optic cable contains an optical fiber with a light
carrying "core" that is only .0025 inches (62.5 microns) in diameter.
Single mode fiber optic cable has an even smaller "core," only .00032
to .0004 inches (8-10 microns). This is smaller than a human hair!
Therefore, any minute particles of dirt or dust can easily block the fiber
from accepting or radiating light. To prevent this from happening, al-
ways use the provided dust caps whenever optical connectors are ex-
posed to air. It is also a good idea to gently clean the tip of an optical
connector with a lint-free cloth moistened with alcohol whenever dust
is suspected.
The status of the VIDEO and AUDIO indicator LEDs should provide
the first clue as to the origin of an operational failure. If these are off, it
usually means that the fiber is broken or has too much attenuation. Next,
be certain that the input and output signal connections are correct.
If, after reviewing the above possibilities, the system is still not oper-
ating, please contact the Customer Service Department for further as-
sistance.
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