Glossary GL-3
Bar Code A pattern of variable-width bars and spaces which
represents numeric or alphanumeric data in machine-
readable form. The general format of a bar code symbol
consists of a leading margin, start character, data or
message character, check character (if any), stop character,
and trailing margin. Within this framework, each
recognizable symbology uses its own unique format. See
Symbology.
Bar Code Density The number of characters represented per unit of
measurement (e.g., characters per inch).
Bar Height The dimension of a bar measured perpendicular to the bar
width.
Bar Width Thickness of a bar measured from the edge closest to the
symbol start character to the trailing edge of the same bar.
BIOS Basic Input Output System. A collection of ROM-based
code with a standard API used to interface with standard
PC hardware.
Bit Binary digit. One bit is the basic unit of binary information.
Generally, eight consecutive bits compose one byte of data.
The pattern of 0 and 1 values within the byte determines its
meaning.
Bits per Second (bps) Bits transmitted or received.
Bit Binary digit. One bit is the basic unit of binary information.
Generally, eight consecutive bits compose one byte of data.
The pattern of 0 and 1 values within the byte determines its
meaning.
bps See Bits Per Second.
Byte On an addressable boundary, eight adjacent binary digits (0
and 1) combined in a pattern to represent a specific
character or numeric value. Bits are numbered from the
right, 0 through 7, with bit 0 the low-order bit. One byte in
memory is used to store one ASCII character.
BOOTP A protocol for remote booting of diskless devices. Assigns
an IP address to a machine and may specify a boot file. The
client sends a bootp request as a broadcast to the bootp
server port (67) and the bootp server responds using the
bootp client port (68). The bootp server must have a table of
all devices, associated MAC addresses and IP addresses.
boot or boot-up The process a computer goes through when it starts. During
boot-up, the computer can run self-diagnostic tests and
configure hardware and software.
CDMA Code Division Multiple Access. Digital cellular phone
service method that separates multiple transmissions over
a finite frequency allocation using Spread Spectrum
techniques.
CDRH Center for Devices and Radiological Health. A federal
agency responsible for regulating laser product safety. This
agency specifies various laser operation classes based on
power output during operation.
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