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Glossary

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Term Main definition
Class D

(1) ISO/IEC 11801 channel designation utilizing twistedpair cabling rated to 100MHz. Used in very high bitrate applications. Corresponds to TIA/EIA Category 5 cabling. (2) IP addresses used for multicast applications that have a range of numbers from 224 through 239 in the first octet.

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Class E

(1) ISO/IEC 11801 channel utilizing twisted-pair cabling rated to 250MHz. Corresponds to the TIA/EIA Category 6 cabling Standard. (2) IP addresses used for experimental purposes that have a range of numbers from 240 through 255 in the first octet.

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Class Ea

ISO/IEC 11801 proposed channel utilizing twisted-pair cabling rated to 500MHz. Corresponds closely to the TIA/EIA Category 6A cabling standard, but there are some differences in some internal performance requirements. (2) IP addresses used for experimental purposes that have a range of numbers from 240 through 255 in the first octet.

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Class F

ISO/IEC 11801 channel utilizing twisted-pair cabling rated to 600MHz.

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Class Fa

ISO/IEC 11801 proposed channel utilizing twisted-pair cabling rated to 1000MHz

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Cleaving

The process of separating an unbuffered optical fiber by scoring the outside and pulling off the end. Cleaving creates a controlled fracture of the glass for the purpose of obtaining a fiber end that is flat, smooth, and perpendicular to the fiber axis. This is done prior to splicing or terminating the fiber.

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Clock

The timing signal used to control digital data transmission.

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Closet

An enclosed space for housing telecommunications and networking equipment, cable terminations, and crossconnect cabling. It contains the horizontal cross-connect where the backbone cable cross-connects with the horizontal cable. Called a telecommunications room by the TIA/EIA standards; sometimes referred to as a wiring closet.

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CMG

A cable rated for general purpose by the NEC.

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CMR

A cable rated for riser applications by the NEC.

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Coating

The first true protective layer of an optical fiber. The plastic-like coating surrounds the glass cladding of a fiber and put on a fiber immediately after the fiber is drawn to protect it from the environment. Do not confuse the coating with the buffer.

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Coaxial cable

Also called coax. Coaxial cable was invented in 1929 and was in common use by the phone company by the 1940s. Today it is commonly used for cable TV and by older Ethernet; twisted-pair cabling has become the desirable way to install Ethernet networks. It is called coaxial because it has a single conductor surrounded by insulation and then a layer of shielding (which is also a conductor) so the two conductors share a single axis; hence

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COC

Certificate of Conformance – Cellular Antenna System handover document bringing together the various commissioning results.

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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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