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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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|VA Volt ampere||
A designation of power in terms of voltage and current.
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Visual Display Unit
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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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Video Graphics Array Lead. A monitor lead.
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A signal that contains visual information, such as a picture in a television system.
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