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Universal Combiner Unit. A 3G combiner unit with 2G/3G diplexor in the same case. The combiner is designed to combine the 3G Tx and Rx bands RF outputs of T-Mobile& H3G onto a common feeder / antenna system while the diplexor unit takes the 3G single and combines 2G and 3G Tx and Rx signals onto a common feeder /antenna system

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UCU Jumper

Jumper connecting onto a UCU towards the main feeder cable.

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UK Plug

Also known as 13AMP PLUG or RG328
A standard 3-pin UK power plug. Used for most UK household and office applications 13AMP.

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Underwriters Laboratories (UL) is an independent product safety certification organisation, which has been in operation since 1894. UL is the most famous Nationally Recognised Testing Laboratory (NRTL) in the United States and conducts certification testing of every electrical appliance. They use 70 different product categories and more than 30 Standards for Safety to evaluate wiring and cable products. UL62, the Standard for flexible cord, is the standard to which trirated cable is approved. It covers flexible cord constructed and listed for use in accordance with Article 400 of ANSI/NFPA 70, The American "National Electrical Code" (NEC). UL has a policy of cross-certification so that a product can be certified by UL using CSA standards, such products are certified C-UL.

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UL Listed
If a product carries this mark, it means UL found that representative samples of this product met UL
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UL Recognized
If a product carries this mark, it means UL found it acceptable for use in a complete UL Listed product.
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The electromagnetic waves invisible to the human eye with wavelengths between 10nm and 400nm.
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Unbalanced line
A transmission line in which voltages on the two conductors are unequal with respect to ground; one of the conductors is generally connected to a ground point. An example of an unbalanced line is a coaxial cable. This is the opposite of a balanced line or balanced cable.
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Underground cable
Cable that is designed to be placed beneath the surface of the ground in ducts or conduit. Underground cable is not necessarily intended for direct burial in the ground.
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Underwriters Laboratories, Inc. (UL)
A privately owned company that tests to make sure that products meet safety standards. UL also administers a program for the certification of category-rated cable with respect to flame ratings. See Chapter 4 for more information on Underwriters Laboratories.
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Unified messaging
The integration of different streams of communications (email, SMS, fax, voice, video, etc.) into a single interface, accessible from a variety of different devices. Unified messaging is a subset of a fully integrated u system.
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The degree of insertion loss difference between ports of a coupler.
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Optical fiber connectors in a system whose end-faces are not in contact with another connector, resulting in a fiber that is launching light from the surface of the glass into air. Also called unterminated or open.
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UPS Uninterruptible power supply

A natural line conditioner that uses a battery and power inverter to run the computer equipment that plugs into it. The battery charger continuously charges the battery. The battery charger is the only thing that runs off line voltage. During a power problem, the battery charger stops operating, and the equipment continues to run off the battery.

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The portion of time a network is running.
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