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Glossary

Search for glossary terms (regular expression allowed)
Term Main definition
Coefficient of thermal expansion

The measure of a material

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Coherence

In light forms, characterized as a consistent, fixed relationship between points on the wave. In each case, there is an area perpendicular to the direction of the light

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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

Generic term for a sub band diplexor / triplexor. Example an MRC or a UCU.

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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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