Unit 3 Exercise 1. Specifications – Definitions

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Unit 3 Exercise 1. Specifications – Definitions

Application – a system, the transmission method of which is supported by telecommunications cabling, such as 100base-TX Ethernet, or digital voice.

Unshielded Twisted Pair – a pair of copper wires twisted together with no electromagnetic shielded around them.

Shielded Twisted Pair – a type of twisted-pair cable in which the pairs are enclosed in an outer braided shield, the individual pairs may be shielded as well.

Fiber Optic Cable – a cable containing one or more optical fibers

Dark Fiber – an unused fiber; a fiber carrying no light, Common when extra fiber capacity is installed

Coaxial Cable – a cable that has a single conductor surrounded by insulation and then a layer of shielding that is also a conductor, the two conductor shares one axis.

Plenum – the air handling space between the walls, under structural floors, and above drop ceilings when used to circulate and otherwise handle air in the building. Plenum grade cable can be run through these spaces if building codes permit it

Riser – a designation for a type of cable run between floors Fire-code rating for indoor cable that is certified to pass through the vertical shaft from floor to floor.

Rip Cord – a length of string built into optical fiber cables that is pulled to split the outer jacket of the cable without using a blade

Core – the central part of a single optical fiber in which that light signal is transmitted (common sizes are 8.3 microns, 50 microns and 6.2 microns.

Attenuation –a decrease in power (loss in signal) from one point to another.

Noise – in a cable or circuit, any extraneous signal (electromagnetic energy) that interferes with the desired signal normally present in or passing through the system

Headroom – a number of decibels by which a system exceeds the minimum defined requirements. The benefit of…...

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