GLOSSARY
EM586-92
that speed is not crucial, and perfect for modems because. With current technology,
phone lines cannot transport more than one signal at a time anyway. The serial port is
often referred to as an RS-232 port.
SCSI (Small Computer System Interface) – An intelligent bus for transmitting data
commands between a variety of devices. There are many implementations of SCSI,
including Fast SCSI, Wide SCSI, Fast Wide SCSI, Fast-20, and Fast-40.
SCSI-2 – The second generation of SCSI; includes many improvements to SCSI-1,
including Fast SCSI, Wide SCSI, and mandatory parity checking.
SCSI-3 – The third generation of SCSI; introduces Fast-20 and Fast-40 as
improvements to the parallel bus. The standard also includes a number of
specifications for high-speed serial bus architectures such as SSA, Fiber Channel, and
IEEE 1394. Also known as Ultra SCSI.
Ultra SCSI – Also known as SCSI-3, is a third generation SCSI standard that introduced
parallel bus speed improvements (FAST-20 and FAST-40), an the miniaturized 68-pin
micro connector.
USB (Universal Serial Bus) – USB consolidates serial, parallel, keyboard, mouse, and
game ports into one asynchronous and isochronous communications port with
bandwidth for data transfer speeds up to 12 Mbps without termination. By daisy-
chaining USB hubs, up to 127 I/O devices can be connected to one USB port on the PC.
USB is completely plug-and play meaning peripherals can be correctly detected and
configured automatically as soon as they are connected.
UTP (Unshielded Twisted Pair) – Twisted pair cable with neither individual nor overall
shielding. Twisted Pair are two wires twisted together to reduce susceptibility to RF
crosswalk.
VGA (Video Graphics Array) – A video adapter that supports 640x480 pixels color
resolution. The Windows OS provides medium text & graphics standard.
VL-Bus – It is also known as Local Bus; this is an I/O interface that is directly connected
and depended of the system CPU. The VL-Bus is an abbreviation of VESA Local Bus.
