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GLOSSARY
XEROX 4890 HIGHLIGHT COLOR LPS INSTALLATION PLANNING REFERENCE GLOSSARY-3
bpi Bits per inch.
bps Bits per second. In serial communication, the instantaneous bit
speed a device or channel transmits a character.
BSC Binary synchronous communications. 1. Data transmission in
which synchronization of characters is controlled by timing
signals generated at the sending and receiving stations. 2.
Communication using binary synchronous line discipline. 3.
Uniform procedure using a standardized set of control characters
and control character sequences for synchronous transmission of
binary-coded data between stations.
buffer Area of memory in which data is stored during transfer from one
device to another. Used for: 1. Accumulating data into blocks
before storage or processing. 2. Adjusting differences of speed
between devices, or between a device and a communicating
facility.
byte Fixed number of bits (in data processing, usually 8) processed as
a single binary value.
cache memory A fast, small memory used to enhance CPU performance,
separate from the main processor memory.
CCID Character code identifier. Code associated with the universal
identifier “Xerox” to indicate the version of the Xerox character
code standard used to code Interpress strings.
CCU Customer Changeable Unit. The color housing that fits inside
the printer.
central processing unit Interprets and executes instructions, performs all operations and
calculations, and controls input and output units and auxiliary
attachments.
channel 1. In data communications, a path or line that enables two or
more devices to communicate (sometimes called a circuit,
facility, or link). 2. In computers, a path for communication
between the central processing unit (CPU) and input and output
units, or between the CPU and peripheral devices.
character cell Area defined by the outside dimensions of a character plus all
horizontal and vertical spacing. In electronic printing, the
character cell is defined by a bitmap of dots.
character code identifier See CCID.
character set Set of all characters defined in a font, including alphabetic,
numeric, and special characters such as symbols.
characters per inch See cpi.