Panasonic FP-D250 User Manual page 590

Gradient In graphics, having an area smoothly blend from one color to another, or
from black to white, or vise versa.
Group In the context of network security, a group is a set of users who share common
permissions for one or more resources. Individually assigned user permissions take
precedence over those assigned through groups.
Guard band The unused bandwidth separating channels to prevent crosstalk.
H
Half Duplex A two-way means of transmission, but data can only travel in one direction
at a time.
Halftone The process of simulating a continuous tone (contone) image with tiny
dots of varying size or position. Large dense dots which sometimes touch represent
darker tones. Smaller lighter dots with white areas between them represent light
tones.
Hard Disk Drive (HDD) A device that can either be internal or connected to the
printer via a SCSI interface or a PCMCIA card. HDDs provide storage for fonts,
forms, spooling and, if the printer is equipped with a fax board, for received faxes.
Header The control information added to the beginning of a transmitted message.
This may consist of packet or block address, destination, message number and
routing instructions.
Hertz A measure of radio frequency. One Hz = one cycle per second. KHz = 1,000Hz;
MHz =1,000,000Hz; GHz=1,000,000,000Hz.
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