-
UDMA:
A protocol developed by Quantum Corporation and Intel that supports
burst mode data transfer rates of 33.3 MBps. This is twice as fast as the
previous disk drive standard for PCs, and is necessary to take advantage of
new, faster Ultra ATA disk drives.
The official name for the protocol is Ultra DMA/33. It's also called UDMA,
UDMA/33 and DMA mode 33.
-
UNIX:
This is an operating system developed by AT&T. It's big push it that it
allows one server to service many different end users at one time.
-
Uploading:
The process of transferring files from a local computer to a remote
computer, network or Web server. The usual method of uploading files is done
using a File Transfer Protocol (FTP) Utility.
-
UPS:
Uninterruptible Power Supply. A backup power unit that provides
continuous power when the normal power supply is interrupted. UPS systems
can be stand-by, only supplying power when the regular supply is
interrupted, or fulltime, relying on regular power and/or batteries to
supply it while it supplies power to the protected device. A UPS is not
necessary on most computer systems, but can be important on systems that
need to be up 24 hours a day, such as servers.
-
Upstream:
The data flowing from the Cable Modem to the CMTS.
-
Upstream
frequency:
The frequency used to transmit data from the CM to the CMTS. Normally in
the 5-42 MHz range for US systems and 5-65 MHz for European systems.
-
URL:
Stands for Universal Resource Locator. It's a fancy way of saying
Internet Address.
-
USB:
Short for Universal Serial Bus, a new external bus standard that
supports data transfer rates of 12 MBps (12 million bytes per second). A
single USB port can be used to connect up to 128 peripheral devices, such as
mice, modems, and keyboards. USB also supports Plug-and-Play installation
and hot plugging.
Starting in 1996, a few computer manufacturers started including USB support
in their new machines. Since the release of Intel's 440LX chipset in 1997,
USB has become more widespread. It is expected to eventually completely
replace serial and parallel ports.
-
User:
Someone attached to a server or host.
-
Utility
Program:
A program developed to run within an Operating System to perform a
specific service.
