| ISP Dictionary - ISP Glossary Definitions for 'u' |
| UART - A chip that standardized serial communications. Its function is to change a byte into a standard sequence of electrical impulses. |
| UDF - see Universal Disk Format or Universal Data Format |
| UDMA - short for Ultra DMA |
| UDP - Part of the TCP/IP suite of protocols. UDP is the part of the TCP/IP suite used by applications to transfer datagrams. It is also the part of TCP/IP responsible... |
| ULSI - A microchip with over one million transistors. Most popular chips today fit this description. Maybe in 10 years we will have the SDULSI, for Super-Duper... |
| Ultra 160M - A form of SCSI that supercedes Ultra2 SCSI. It runs at up to 160 megabytes per second and uses 80-pin connections over copper wires. |
| Ultra 320M - A form of SCSI that doubles the potential performance of Ultra 160M SCSI and offers throughput of up to 320 megabytes per second per channel. |
| Ultra ATA/100 - Another extension to the ATA interface that adds a 50% increase in top speed over ATA/66, getting to 100MB/second, up from 66MB/second. This standard also... |
| Ultra ATA/133 - This refers to what is most probably the final extension to the parallel ATA connection standard. The proposal was created by Maxtor, and allows a top... |
| Ultra ATA/33 - An extension to the ATA interface (IDE) that effectively doubles the top data transfer speed of IDE from 16.6MBytes/second up to 33 MBytes/second. Also... |
| Ultra ATA/66 - An extension to the ATA interface (IDE) proposed by Quantum that effectively doubles the data transfer speed of the Ultra ATA/33 interface to 66MBps. To... |
| Ultra DMA - An extension to the ATA interface (IDE) that effectively doubles the top data transfer speed of IDE from 16.6MBytes/second up to 33 MBytes/second. Also... |
| Ultra Large Scale Integration - A microchip with over one million transistors. Most popular chips today fit this description. Maybe in 10 years we will have the SDULSI, for Super-Duper... |
| Ultra SATA - A specification for consumer hard drive connections that boosts the data transfer rate up to 150MB/second. In addition, it changes IDE/ATA from a parallel... |
| Ultra SCSI - This is SCSI that communicates twice as fast as standard SCSI-2. Normal Ultra-SCSI transfers data at 20MBps, and Wide Ultra-SCSI transfers data at 40MBps.... |
| Ultra XGA - A display with 1600x1200 pixel resolution. |
| Ultra2 SCSI (LVD) - This standard doubles the maximum transmission speed of Ultra SCSI. Almost all devices made to this standard support the 80MBps transfer rate of Ultra2... |
| Ultra3 SCSI - Ultra3 SCSI doubles the maximum transfer rate of Ultra2 SCSI up to 160MBps. This is synonymous with 160M SCSI. |
| Ultraviolet - A spectrum of light with wavelengths from about four nanometers to 380 nanometers. Light below 4 nm is in the x-ray spectrum, and just above 380 nm is... |
| UML - Initially created at Rational Software (now part of IBM), this is an industry-standard method of specifying, visualizing, constructing, and documenting... |
| Unbuffered memory - Memory modules that do not support Error Checking and Correcting (ECC) or parity checking functionality. |
| UNC - The name given for the naming used when one specifies: \\the server\the volume\the path\then the file name of a file. So, a UNC filename would look like... |
| Unicode - A standard character set which uses two bytes or 16 bits to code each character. Compare it to ASCII, which uses only one byte or 8 bits per character.... |
| Unified Cache - Multiple memory caches, most often L1 and L2 cache, that are treated as a single unit in that they don't ever hold the same information. In non-unified... |
| Unified Modeling Language - Initially created at Rational Software (now part of IBM), this is an industry-standard method of specifying, visualizing, constructing, and documenting... |
| Uninterruptible Power Supply - A device that contains a battery and some circuitry to supply your computer with power for a limited time (depending on the battery) if there is any sort... |
| Union - This consists of all of the items from two or more sets, similar to "AND" in a function. For example, the union of {1,2,3} and {3,4,5} is {1,2,3,4,5}.... |
| Universal Asynchronous Receiver Transmitter - A chip that standardized serial communications. Its function is to change a byte into a standard sequence of electrical impulses. |
| Universal Data Format - A superset of data formats used with GIS, imaging, mapping, and CAD products. You can access data in UDF format instead of converting it from one format... |
| Universal Disk Format - A file system that supports CD-RW, DVD-ROM, and DVD-Video. It also allows for easily writing more data to CD-R and CD-RW disks with the appropriate software.... |
| Universal Naming Convention - The name given for the naming used when one specifies: \\the server\the volume\the path\then the file name of a file. So, a UNC filename would look like... |
| Universal Resource Locator - This is what is used to give Web addresses for HTML, VRML, WAV, and other files. It simply contains the Internet name of the machine containing the data... |
| Universal Serial Bus - A serial connection technology that is almost universally available in current PCs. Version 1.x allowed for 12Mbps transfer rates, and this was boosted... |
| unix - A computer operating system widely used on computers big and small, and very commonly used on the Internet. Many of MSDOS' commands were adapted from the... |
| Unshielded Twisted Pair - Cables that consist of pairs of unshielded wire twisted together. These cables are used for data and telephone networks. They are cheap to produce because... |
| Upgrade - This normally refers to a newer version of software, or a version with an enhanced feature set. If you already own a previous version of the software,... |
| Uplink Port - A special networking port on a hub or switch that is used to connect it to a larger network. Often you need a special crossover cable to make this connection... |
| upload - To transfer a file from your computer system to another system via a modem over telephone or cable lines or a telnet connection using a transfer protocol... |
| UPS - A device that contains a battery and some circuitry to supply your computer with power for a limited time (depending on the battery) if there is any sort... |
| Upstream - This refers to sending of data from a client machine across the Internet. With cable modems and ADSL, upstream speeds are slower than downstream speeds.... |
| urban legend - An oft-told tale on the Internet that is untrue, but refuses to die. They |
| URI - Universal Resource Identifier. A standardized method of identifying |
| URL - Uniform Resource Locator. URLs specify the location of a resource in |
| URL poisoning - a method of tracking Web user behavior by adding an ID number to the URL line in a Web browser when a user visits a particular site. This ID number can... |
| URN - Uniform Resource Name. A standardized name for a persistent, location-independent, resource identifier. As conceived, when the system is implemented, you... |
| USB - A serial connection technology that is almost universally available in current PCs. Version 1.x allowed for 12Mbps transfer rates, and this was boosted... |
| Usenet Newsgroups - Usenet Newsgroups are discussion groups about a topic that is |
| User Datagram Protocol - Part of the TCP/IP suite of protocols. UDP is the part of the TCP/IP suite used by applications to transfer datagrams. It is also the part of TCP/IP responsible... |
| UTP - Cables that consist of pairs of unshielded wire twisted together. These cables are used for data and telephone networks. They are cheap to produce because... |
| UUCP - A UNIX protocol and set of programs most often used to copy files across serial connections and telephone lines. UUCP was often used to transfer e-mail... |
| UXGA - A display with 1600x1200 pixel resolution. |