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Horizontal scanning
Reading of documents in the horizontal
direction is called "horizontal scanning,"
and the number of pixels per unit length
when the horizontal scanlines are separated
into pixels is called the "horizontal scan-
ning density" (horizontal resolution). G3
facsimiles separate scanlines into 8 or 16
pixels per 1 mm, so the horizontal scanning
density becomes either 8 dots/mm or 16
dots/mm, respectively.
I
IETF
IETF stands for Internet Engineering Task
Force.
ISO
ISO stands for International Organization
for Standardization.
ITU-T
ITU-T stands for International Telecommu-
nication Union-Telecommunication sector.
It was formerly known as CCITT before its
name was changed to ITU-T in March
1993.
M
Modulo 2
"Modulo" is an arithmetic operator that
indicates the remainder. "Calculating the
modulo 2 of a certain number" refers to the
remainder obtained by dividing that number
by 2.
MPU (Micro Processing Unit)
The part that controls the core functions of
a computer. The MPU is divided into three
parts with different functions, the I/O unit,
control unit and arithmetic logic unit
(ALU).
N
Non-feed
The document placed on the copy board is
not fed.
P
Pixel
The smallest element that comprises an
image.
Pseudo bell
The bell that is rung by the facsimile when
it judges whether or not the incoming call is
a telephone call in the FAX/TEL switching
mode
Pseudo ring back tone
The signal that is sent to the other party
while judgment is performed as to whether
the incoming call is a facsimile or a tele-
phone call in the FAX/TEL switching
mode. While this signal is being sent, the
DC loop is formed which means that the
call is charged.
R
Relay
A component that functions as a switch for
turning a circuit ON or OFF by opening/
closing of contacts. Some relays function as
relays without contacts just like a transistor,
and others use the action of heat or magne-
tism.
GLOSSARY
1
2
3
4
5
6
A
çi
A–69
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