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Term Main definition
The portion of time a network is running.
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USB- A hardware interface used to connect PC devices. USB is hot-swappable, meaning that a computer does not need to be turned off when new devices are plugged in.

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USOC Universal Service Order Code

Developed by AT&T/the Bell System, the Universal Service Order Code (pronounced

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UTP Unshielded twisted pair

(1) A pair of copper wires twisted together with no electromagnetic shielding around them. (2) A cable containing multiple pairs of UTP wire. Each wire pair is twisted many times per foot (higher grade UTP cable can have more than 20 twists per foot). The twists serve to cancel out electromagnetic interference that the transmission of electrical signal through the pairs generates. An unshielded jacket made of some type of plastic then surrounds the individual twisted pairs. Twisted-pair cabling includes no shielding. UTP most often refers to the 100 ohm Categories 3, 5e, and 6 cables specified in the ANSI/TIA/EIA-568-B standard.

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UWB/Ultra Wide Band

Covering the full 1800MHz -2600MHz bands

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V.35 connector, sometimes referred to a Viking connector a type of D25W connector with a very specific pin configuration.

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VA Volt ampere

A designation of power in terms of voltage and current.

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Visual Display Unit
Also known as a Monitor

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Velocity of propagation
The transmission speed of electrical energy in a length of cable compared to speed in free space. Usually expressed as a percentage. Test devices use velocity of propagation to measure a signal
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Vertical-cavity surface-emitting laser (VCSEL)
A type of laser that emits coherent energy along an axis perpendicular to the pn junction.
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Very high frequency (VHF)
Frequency band extending from 30MHz to 300MHz.
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Very low frequency (VLF)
Frequency band extending from 10KHz to 30KHz.
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Variable Electrical Tilt is the addition of AISG control system to enabling tilting of the antennas from a safe location on the site.

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VGA Lead

Video Graphics Array Lead. A monitor lead.
VGA is used to define a specific display resolution. Resolution is defined by the number of individual dots that a display uses to create an image. These dots are called pixels. A VGA display has 640 horizontal pixels and 480 vertical pixels giving a total display resolution of 307,200 individual pixels that are used to compose the image delivered by a projector

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A signal that contains visual information, such as a picture in a television system.
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