Muratec F-150, F-100, F-120 manual 3.18, Halftone - See Grayscale, Hub - See Relay broadcasting

Just in case …

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 tele- phone 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 possi- ble 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 — 203H × 196V lpi. Also shown as G3F (“Group 3 fine”) on some fax units.

Grayscale — Not a level of resolution, but a method of scanning and transmitting halftone images. Fax machines with grayscale abilities interpret photographs in levels of gray between white and black. The transmitting fax machine must have grayscale 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 Grayscale.

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-Tgroup 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, cov- ering communication protocol and transmission. Muratec Group 3 fax machines offer the fastest transmissions allowed by the ITU-Twhen communicating with other Group 3 units.

ITU-TTest Document 1 — Also called the Slerexe (“slehr-rehks”) letter; sometimes erroneously called ITU-TTest Chart 1. An ITU-Tstandard document with a known black density which fax makers often use in testing, and subsequently publicizing, the transmission speeds of their fax machines.

ITU-T V.29 and V.27 ter. — A standard set of communication procedures allowing fax machines to talk to all other units adhering to those standards.

JBIG — Joint Bi-level Image experts Group, the new ITU-Tstandard image data com- pression method. As JBIG compresses the data more efficiently than MMR, it is especially effective when transmitting halftone (grayscale) image document.

(Of course, the compression ratio may vary with the image data.)

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.

Load number — A number assigned to telecommunications equipment used in Canada; designed to help prevent overloading on a telephone circuit. See also Ringer equivalence number.

Location ID — See Station ID.

lpi — Lines per inch. The way fax image resolution is measured. (For example, see Normal resolution.)

MH — Modified Huffman, the standard ITU-TGroup 3 data compression method. A one-dimensional coding scheme that compresses data in a horizontal direction only. A feature of all Muratec fax machines, MH assures transmissions faster than one page per minute when communicating with other Group 3 units, regardless of man- ufacturer. See also MSE, SMSE.

Modem — Modulator-demodulator. A device that converts digital data, like infor- mation from a fax machine, into an analog signal for transmission over ordinary (analog) telephone lines. A modem is included in a fax machine and allows it to be connected directly to a PSTN telephone line.

Monitor — A speaker in most Muratec fax machines which can allow one to hear the dialing process. This is not a speakerphone, because it has no microphone for speaking to the person being called; for regular two-way voice communication, one must use the handset. See also On-hook dialing.

MSE, SMSE — Muratec’s proprietary data compression methods, allowing a Muratec- manufactured fax machine to transmit more quickly when communicating with another Muratec-manufactured unit. MSE and SMSE are features on many Muratec fax machines. See also MH.

Normal resolution — Shown as “norm”; 203H × 98V lpi. The default resolution mode for all Muratec fax machines.

One-touch dialing — Allows the fax user to store frequently used fax numbers for dialing with the touch of one key. See also Autodialing and Speed-dialing.

On-hook dialing — Dialing numbers by using the keypad on the fax unit without lifting a handset. On most Muratec fax models, one can do this either silently or by using the monitor. See also Monitor.

Original document size — The largest (or smallest) document that can be fed safely through a fax machine.

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