X75HD Installation and Operation Manual 181
Appendix C: Servicing Instructions
Preliminary—Contents are proprietary and confidential. Do not photocopy or distribute.
Understanding and Working With Fiber Optics
Input and output modules using optical fibre transmitters and receivers
were developed in response to a growing demand for a flexible method
of transporting very high speed digital video and audio over long
distances.
Fiber optic technology offers many benefits over copper wire systems:
• Longer distance capability
• Higher bandwidth
• Better signal quality
• Immunity from EM radiation and lightning
• Advantage of being light weight
• Ability to be easily upgraded
Basic Principles
Fiber optic technology can be explained using these two concepts:
1. Light is transmitted over optical fiber by reflecting it within a long
“cylindrical mirror.”
2. The mirrored surface occurs at the core cladding interface. By
sending on/off bursts of light within the optical fiber, light can be
guided along varying paths.
See Figure C-1 and Table C-1 on page 182 for further explanation.
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