LANcat
User Manual
Page E-6
G
Gateway - A device that interconnects two or more networks that
may use different protocols and media.
H
Hertz (Hz) - Unit of measure for frequency in cycles per second
(cps).
Horizontal Cable - The part of a building cabling that extends from
and includes the telecommunications outlet in the work area
to the telecommunications (IDF) closet on the same floor.
Hub - LAN equipment that allows multiple network devices to be
connected to the network cabling system through a central
point. Also called a concentrator.
I
I/O - Input/Output, referring to a device input and output process.
IDF - Intermediate Distribution Frame. The distribution point
where vertical backbone cable is connected to the horizontal
cables.
IEEE - Institute of Electrical and Electronic Engineers.
Impedance - Frequency dependent parameter defined by the ratio
of the AC Voltage to Current across a circuit element.
Impulse Noise - Non-repetitive electrical spikes or pulses caused by
external electro-magnetic fields.
Inductance - The ability to store a magnetic field across a
conductor measured in Henries (H).
Insulation - A non-conductive material used to isolate conductor
surfaces.
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