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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-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. Pitney Bowes Group 3 fax machines offer the fastest
transmissions allowed by 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
publicizing, 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 Pitney Bowes units for status
displays.
Leased line
See Private line.
Location ID
See Station ID.
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