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Jargon Buster
The du Pré Jargon Buster found the following for - UNos A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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Term
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Explanation
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| U reference point | An ISDN term. The interface between the user's premises ISDN termination point and the local digital exchange. Controlled by the PTOs | |
| UHF | A radio transmission term. Ultra High Frequency. 300 MHz - 1300 MHz | |
| UMTS | A cellular radio term. Universal Mobile Telecommunications System. The European thrid generation wireless standard. According to the GSM association, UMTS will offer a wide range of voice, data and multimedia services. Data rates will reach from 114 to 2000Kbps (or 2 Mbps) depending on wether the user is stationary or in motion | |
| UN | United Nations | |
| Unavailable | A telephony term. The message ‘Unavailable’ is delivered when a call comes from a network that does not support CLI and BT Call Return type services. This could be from another network such as some mobile networks, a caller using a Chargecard, or from calls where the message ‘Payphone’, ‘International’, or ‘Operator’ is delivered - see Witheld | |
| UNI | A Frame Relay term. User to Network Interface | |
| Unix | A multi-user operating system designed for use on mini-computers, but now becoming more popular on PCs. Usually aimed at Corporates and large network users | |
| Uplink port | Port used to link hubs | |
| Upstream | A BT term. Indicates data flow from the End User | |
| UPSU | Uninterruptible Power Supply Unit. In effect, large batteries to provide power to a piece of equipment in case of mains failure, without a break in supply | |
| URL | see URL/IP | |
| URL/IP | An Internet term. Universal Resource Locator. The form of Internet address used for the world wide web, eg, dupre.co.uk | |
| USB | Universal Serial Bus. A slot in a PC from which up to 127 peripherals can be attached in a daisy-chain manner | |
| Usenet | An Internet term. Also known as Newsgroups. A large number of discussion forums on different subjects. Anyone can join a group to listen and contribute to a discussion | |
| User to User Signalling | see UUS | |
| UTP cable | Unshielded Twisted Pair cable. Contains one or more pairs of cables. The two wires of each pair are twisted around each other at a pitch of 6 twists per inch to minimise the effects of electromagnetic radiation. Made to category 3 or 5. The former is used for telephone system cabling, the latter for computer networks | |
| Uuencoding | An Internet term. Pronounced ‘you-you-encoding’. Enables binary files, typically graphics or programs, to be converted to ASCII so they can be sent by e-mail | |
| UUS | A BT Digital Select Service. User to User Signalling was launched on 21st September 1998, and allows a subscriber to exchange a limited amount of data with another subscriber using the D channel, whether the telephone call has been connected or not. This service is available on ISDN BRA, only. Data can be sent at either 500bit/s continuously, or in bursts up to 2.4Kbit/s for 2 seconds, providing 128 octets. UUS1 allows this before the call is connected - during the ‘set up’ phase of the call; before connection and charging begins UUS3 allows this whilst the call is connected - during the ‘active’ phase of the call - whilst the call is connected |