Glossary
Term | Main definition |
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Coherence length or time | The distance time over which a light form may be considered coherent. Influenced by a number of factors, including medium, interfaces, and launch condition. Time, all things being equal, is calculated by the coherence length divided by the phase velocity of light in the medium.
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Coherent communications | Where the light from a laser oscillator is mixed with the received signal, and the difference frequency is detected and amplified.
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Coherent light | Light in which photons have a fixed or predictable relationship; that is, all parameters are predictable and correlated at any point in time or space, particularly over an area in a lane perpendicular to the direction of propagation or over time at a particular point in space. Coherent light is typically emitted from lasers.
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Collision | The network error condition that occurs when electrical signals from two or more devices sharing a common data transfer medium crash into one another. This commonly happens on Ethernet-type systems.
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Combiner |
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Combiner Jumper | Jumper connecting onto a Combiner towards the main feeder cable.
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Committed information rate (CIR) | A commitment from your service provider stating the minimum bandwidth you will get on a frame relay network averaged over time.
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Common mode transmission | A transmission scheme where voltages appear equal in magnitude and phase across a conductor pair with respect to ground. May also be referred to as longitudinal mode.
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Community antenna television (CATV) | More commonly known as cable TV, a broadband transmission facility that generally uses a 75 ohm coaxial cable to carry numerous frequency-divided TV channels simultaneously. CATV carries high-speed Internet service in many parts of the world.
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Compliance | A wiring device that meets all characteristics of a standard is said to be in compliance with that standard. For example, a data jack that meets all of the physical, electrical, and transmission standards for ANSI/TIA/EIA- 568-B Category 5e is compliant with that standard.
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Composite cable | A cable that typically has at least two different types of transmitting media inside the same jacket; for example, UTP and fiber.
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Concatenation | The process of joining several fibers together end to end.
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Concatenation gamma | The coefficient used to scale bandwidth when several fibers are joined together.
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Concentrator |
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Concentric |
Sharing a common geometric center.
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