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200 Appendix F: Glossary
• Half-duplex mode
A communication method that involves sending or receiving information.
However, this cannot be done simultaneously. For example, all hubs operate in
half-duplex mode.
• Horizontal sync
The part of a video signal that indicates the end of a row and the start of a new one.
See also vertical sync.
• Host
In general, Host refers to the principal CPU in one's computer. It can also refer
to the principal computer in a multi-computer set-up.
• HSL
A color space that represents color using components of hue, saturation, and
luminance. The hue component describes the actual color of a pixel. The
saturation component describes the concentration of that color. The luminance
component describes the combined brightness of the primary colors.
• Interlaced scanning
Describes a scan mode in which the video source transfers odd-numbered rows of
source data to the destination first, and then the even-numbered rows (or
vice-versa).
See also progressive scanning.
• Internet Protocol (IP) address
The electronic address of a computer (station) on a TCP/IP network, which is
unique for every client and server station. Client workstations have either a
permanent or dynamically assigned address. The IP address is a dot address that
is written as four sets of numbers separated by periods, also called dotted quad
notation (for example, 203.142.62.2). The TCP/IP packet uses 32 bits to hold the
IP address.
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