User manual

Just in case …
3.19
Delayed command
Transmission or polling operation set by the user to occur later, automatically, at a
predetermined time. Great for reducing costs by making fax calls during times, such
as late at night or on weekends, when telephone costs are lowest.
Digital
Using the binary system — i.e., either 0 or 1 — to describe everything, so that 0
means off and 1 means on; digital fax machines convert the graphic image of your
document into a series of zeros and ones by using the binary system of transmission
to encode black and white occurrences. This increases transmission speed by passing
over white spaces. See also White-line skip.
Digital fax
Unlike analogue systems that scan every portion of a document, digital fax machines
survey a document’s overall picture content. Digital fax machines scan a line and
convert the information into a binary code of zeros and ones. The fax machine takes
this information and compresses it, providing high transmission speeds. Many
Muratec units offer proprietary method for faster transmission between Muratec-
manufactured units (see also
MSE
,
SMSE
).
Effective printing width
The widest image that can be printed on a fax.
Effective scan width
The maximum width the scanner in a fax can scan during transmission.
Facsimile (or fax)
A form of communication involving the scanning and decoding of a document into
electrical signals and transmitting of the document, over telephone lines to another
device which then reconstructs the signals to produce an exact duplicate of the
document. Also, a machine that performs such communication.
Fallback
Group 3 fax machines operate at the highest transmission speed possible on a given
telephone line. Muratec systems offer automatic fallback; if line quality drops during
transmission, the fax machine will reduce speed to the fastest possible level.
Fine resolution
203
H
x 196
V
lpi. Also shown as
G
3
F
(“Group 3 fine”) on some fax units.
Greyscale
Not a level of resolution, but a method of scanning and transmitting halftone images.
Fax machines with greyscale abilities interpret photographs in levels of grey between
white and black. The transmitting fax machine must have greyscale ability to send a
photographic image accurately, but the receiving machine does not need it to print the
image.
Group 3
Refers to fax machines that use digital encoding. These units transmit one page in less than one
minute and produce resolution of 203 × 98, 203 × 196, or 203 × 392 lpi.
Halftone — See Greyscale.
Handshaking
A data interchange between telecommunications and/or computer equipment that
“introduces” two systems to each other. For example, faxes use a handshaking
protocol to identify the
ITU
-
T
group of each unit and to begin fax communication.
Hub — See Relay broadcasting.
Hz(or Hertz)
A measure of frequency equal to one cycle per second. Used in the specifications for
a fax machine, it identifies the
AC
power the unit requires.
ITU
-
T
International Telecommunications Union — Telecommunications Sector. (Formerly
known as
CCITT
, for Consultative Committee for International Telegraph and
Telephone.) A telecommunications forum for member countries of the United
Nations; its Study Group
XIV
established the primary groups for fax equipment,
covering communication protocol and transmission. Muratec Group 3 fax machines
offer the fastest transmissions allowed by the
ITU
-
T
when communicating with other
Group 3 units.
ITU
-
T
Test Document 1
Also called the Slerexe (“slehr-rehks”) letter; sometimes erroneously called
ITU
-
T
Test
Chart 1. An
ITU
-
T
standard document with a known black density which fax makers
often use in testing, and subsequently publicising, the transmission speeds of their fax
machines.
ITU
-
T V
.29 and
V
.27ter.
A standard set of communication procedures allowing fax machines to talk to all
other units adhering to those standards.
Laser printing
A plain-paper printing system. Toner is attached to a charged drum and an image is
transferred onto plain paper through electrical currents, then fused with heat and
pressure to produce a dry, permanent printout.
LCD
Liquid crystal display. Used on some Muratec units for status displays.
Leased line — See Private line.
Location
ID
— See Station
ID
.
lpi
Lines per inch. The way fax image resolution is measured. (For example, see Normal
resolution.)