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Glossary
boot
To start the system by turning on the workstation and monitor; the system is fully booted
when you see the console login prompt or the login screen.
button
On a mouse, a button is a switch that you press with a finger. In a window on your screen,
a button is a labelled rectangle that you click with a mouse.
CCIR 601
A high-end digital video interface standard developed by the CCIR (Comité Consultatif
International de Radiodiffusion, or International Radio Consultative Committee). In
CCIR 601 the luminance and chrominance are broken down into three digital signals: one
for luminance (brightness) and two for chrominance (color) information. The color
information is spatially sub-sampled horizontally so that the two chroma components
occupy the same data bandwidth as the luminance component. Both the luminance and
chrominance are then multiplexed up to a double rate byte wide data stream. The SGI
digital standard used in the O2+ workstation is very similar to 601, with the exception
that 601 is balanced ECL, while SGI uses single-ended TTL. Additionally, 601 requires a
fixed number of samples per horizontal line, while the SGI implementation is
programmable.
CD-ROM disk (CD)
A flat metallic disk that contains information that you can view and copy onto your own
hard disk; you cannot change or add to the information on the CD-ROM. CD-ROM is the
shortened term for compact disk: read-only memory.
centralized network
A network in which a central server controls services and information; the server is
maintained by one or more network administrators. On a centralized network that uses
NIS, this server is the NIS master, and all other systems on the network are NIS clients.
See also
network administrator.
chassis
The external metal framework of the workstation that contains its working parts.
chrominance
In an image reproduction system, a separate signal that contains the color information.
Black, white, and all shades of gray have no chrominance and contain only the luminance
(brightness) portion of the signal. All colors have both chrominance and luminance.