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Telecom Dictionary - U

UA - User Agent.

UHF - see Ultra High Frequency.

Ultra High Frequency (UHF) - This frequency spectrum portion is used for TV and cellular transmissions and is between 300 MHz and 3 GHz in frequency.  (See VHF.)

Ultra Hi-Res - This stands for Ultra High Resolution and refers to monitors that have a resolution of 1024 x 768 or better.

Ultraviolet - This is the portion of the electromagnetic spectrum with wavelengths between 4 and 3-400 nanometers (these are shorter wavelengths than with the visible light portion of the electromagnetic spectrum).

Un-Archive (Un-Arc) - To remove files from an archive.

Unattended - This term describes telecom devices that don't need a human operator.

Underline Character - The character "_" under another character, such as this.

Underscore Character - The character "_" between other characters, such_as_these, usually representing spaces.

Unicast - The communication of one device to one other device only. (See Broadcast and Mulitcast).

Unicode - The 16-bit system for encoding the characters and letters of the world's languages.

Uplink - This is the earth station that is used to transmit signals to a satellite.

Upload - To transmit data from your computer to another computer (over a network).

Uppercase - Capital letters, such as THESE.

UPS - This stands for uninterruptible power supply and is just what it sounds like.

Uptime - This is the duration of a network's uninterrupted work time.

User Level - A user's level of security or privileges.

User Name (Number) - The login name (number) you use to access a system (usually accompanied by a password).