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<p class="importanttitle"> Glossary of Terms</p>
<table width="100%" border="1" bgcolor=#FFFFFF>
<tr bgColor="#ffffff">
<td bgColor="#ffffff"><dt><b><font color="#000000">All Call</font></b></dt></td>
<td bgColor="#ffffff"><dt><font color="#000000">Allows simultaneous ‘talk’ to all
intercom speakers. Most commonly used with Lee Dan’s
<br/>TEK-COM common talk intercom system.</font></dt></td>
</tr>
<tr bgColor="#ffffff">
<td><dt><b><font color="#000000">Alternating Current (AC)</font></b> </dt></td>
<td><dt><font color="#000000">Differs from direct current (DC) in
only one very important point. It typically starts at zero,
gradually increases to a maximum, then gradually decreases to
zero. This change is then repeated in the opposite direction.
Alternating current changes direction 60 times per second.</font> </dt></td>
</tr>
<tr bgColor="#ffffff">
<td bgColor="#ffffff"><dt><b><font color="#000000">American Wire Gauge (“AWG”)</font></b> </dt></td>
<td bgColor="#ffffff"><dt><font color="#000000">A standard system for designating wire
diameter. Most intercoms use 22 AWG (read “22 gauge”) wire,
although the transformer and door strike wiring is usually 18
AWG. The larger the number, the smaller the wire diameter. Hence
22 AWG wire is thinner than 18 AWG.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Ampere</font></b></dt></td>
<td><dt><font color="#000000">The unit of current. One ampere is the
current flowing through one ohm of resistance at one volt
potential. Analogous to gallons of water flow past a given
point.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Audio Frequency</font></b></dt></td>
<td><dt><font color="#000000">The range of frequencies audible to
the human ear. Usually 20-20,000 Hz.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Buried Cable</font></b></dt></td>
<td><dt><font color="#000000">A cable installed directly in the
earth without use of underground conduit. Also called “direct
burial cable.”</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Cabling</font></b></dt></td>
<td><dt><font color="#000000">The twisting together of two or more
insulated conductors to form a cable.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Call Tone</font></b></dt></td>
<td><dt><font color="#000000">Electronic tone signal which sounds
when a remote/sub station calls a master station.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Capacitance</font></b></dt></td>
<td><dt><font color="#000000">Ratio of the electrostatic charge on a
conductor to the potential difference between the conductors
required to maintain that charge.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Circuit</font></b></dt></td>
<td><dt><font color="#000000">Path through which electrical energy
flows to and from the source to the devices being operated.</font> </dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000"> Coaxial Cable</font></b> </dt></td>
<td><dt><font color="#000000">A cable consisting of two cylindrical
conductors with a common axis, separated by a dielectric.
Generally used to carry video signals. See Lee Dan model RG-59U.</font> </dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Color Code</font></b></dt></td>
<td><dt><font color="#000000">A system for circuit identification
through use of solid colors and contrasting tracers or striped
conductors.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Common Wire(s)</font></b></dt></td>
<td><dt><font color="#000000">Common wires may be looped/connected
from station to station (occasionally distance limitations may
prevail).</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Conductance</font></b></dt></td>
<td><dt><font color="#000000">The ability of a conductor to carry an
electric charge. The ratio of the current flow to the potential
difference causing the flow. The reciprocal of resistance.</font> </dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Conductivity</font></b></dt></td>
<td><dt><font color="#000000">The capacity of a material to carry
electrical current—usually expressed as a percentage of copper
conductivity (copper being 100%).</font></dt></td>
</tr>
<tr>
<td><b><font color="#000000">Conductor</font></b></td>
<td><dt><font color="#000000">An uninsulated wire suitable for
carrying electrical current.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Conduit</font></b></dt></td>
<td><dt><font color="#000000">A tube, pipe or trough in which
insulated wire and cables are run.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Continuity Check</font></b></dt></td>
<td><dt><font color="#000000">A test to determine whether electrical
current flows continuously throughout the length of a single
wire or individual wires in a cable.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Coverage</font></b></dt></td>
<td><dt><font color="#000000">The percent of completeness with which
a metal braid covers the underlying surface.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Crosstalk</font></b></dt></td>
<td><dt><font color="#000000">Signal interference between nearby
conductors caused by pickup of stray energy.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">C.S.A.</font></b></dt></td>
<td><dt><font color="#000000">Abbreviation of Canadian Standards
Association, a nonprofit, independent organization which
operates a listing service for electrical and electronic
materials and equipment. The Canadian counterpart of the
Underwriter’s Laboratories.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Current Carrying Capacity</font></b> </dt></td>
<td><dt><font color="#000000">The maximum current an insulated
conductor can safely carry without exceeding its insulation and
jacket temperature limitations.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Desk Mount</font></b></dt></td>
<td><dt><font color="#000000">A method to mount a station on a
desktop, usually with a sloping face, and generally using Lee
Dan model IH-400A.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Direct Current (“DC”)</font></b> </dt></td>
<td><dt><font color="#000000">Term used to describe the flow of
electrical current in one direction only, uniform and
continuous.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000"> Door Station</font></b> </dt></td>
<td><dt><font color="#000000">A remote (sub) station located at a
door or gate. Usually weather resistant, available with or
without a call button for tone signalling. Communication is
hands-free at the door, and controlled by the indoor master.</font> </dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Door Strike</font></b> <br />
<b><font color="#000000">(also Door Opener)</font></b></dt></td>
<td><dt><font color="#000000">An electro mechanical device used to
unlock a door from a remote location. Most popular is Lee Dan
model DO-001.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Drain Wire</font></b></dt></td>
<td><dt><font color="#000000">In a cable, the uninsulated wire laid
over the component or components and used as a ground
connection.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Fail Safe </font></b></dt></td>
<td><dt><font color="#000000">In a power down state, the device is
unlocked or unlatched.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Fail Secure</font></b></dt></td>
<td><dt><font color="#000000">In a power down state, the device is
locked or latched.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Flush Mount</font></b></dt></td>
<td><dt><font color="#000000">A mounting method requiring a cutout
be made into the finished wall or other surface. Flush mounted
equipment will be recessed into the wall so the mounted object
protrudes little from the face of the wall (see ‘recessed’).</font> </dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Gauge</font></b></dt></td>
<td><dt><font color="#000000">Term used to denote the physical size
of wire or metal.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Ground</font></b></dt></td>
<td><dt><font color="#000000">A conducting connection between an
electrical circuit and the earth or other large conducting body
to serve as an earth thus making a complete electrical circuit.
The purpose is to minimize danger from electrical shock and
prevent lightning </font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Hands-Free Reply</font></b></dt></td>
<td><dt><font color="#000000">Ability to reply to an incoming call
from a master station, without touching your intercom.</font> </dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">High Voltage</font></b></dt></td>
<td><dt><font color="#000000">Generally, a wire or cable with an
operating voltage of over 600 volts.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Hook-Up Wire</font></b></dt></td>
<td><dt><font color="#000000">A wire used for low current, low
voltage (under 1000 volts) applications within enclosed
electronic equipment.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000"> Horizontal Mailbox</font></b> </dt></td>
<td><dt><font color="#000000">A multi compartment mailbox with deep
‘horizontal’ doors/compartments. Horizontal mailboxes generally
require very deep walls of 15" or more. Horizontals are more
expensive than ‘vertical’ mailboxes, but generally allow more
boxes to be installed in limited wall (width) space.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Housing</font></b></dt></td>
<td><dt><font color="#000000">A mounting device used to install a
station or panel. There are three popular kinds; flush
(recessed), surface, or desk mount.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Impedance</font></b></dt></td>
<td><dt><font color="#000000">The total opposition that a circuit
offers to the flow of alternating current or any other varying
current at a particular frequency. It is a combination of
resistance R and reactance X, measured in ohms.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Insulation</font></b></dt></td>
<td><dt><font color="#000000">A material having high resistance to
the flow of electric current. Often called a dielectric in radio
frequency cable.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Jacket</font></b></dt></td>
<td><dt><font color="#000000">An outer nonmetallic protective
covering applied over an insulated wire or cable.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000"> Key Keeper</font></b> </dt></td>
<td><dt><font color="#000000">Used in buildings with mailboxes
located behind a locked entry door. This lock box is designed to
hold the key to an apartment or office building, for use by the
local postal carrier. Always sold without a lock. The (postal)
lock is provided and installed by the local post office.</font> </dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">L.E.D. Annunciation</font></b></dt></td>
<td><dt><font color="#000000">L.E.D.’s (light emitting diodes) used
on a master, under each selector button used to indicate which
remote is calling a master. Master operator then presses
indicated selector button to control conversation.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Master Station</font></b></dt></td>
<td><dt><font color="#000000">An intercom station which can both
initiate and control both elements (Talk, Listen) of a
conversation.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Mortise</font></b></dt></td>
<td><dt><font color="#000000">A notch or hole cut in a piece of wood
or metal to receive a projecting part shaped to fit.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Multiconductor</font></b></dt></td>
<td><dt><font color="#000000">More than one conductor within a
single cable complex.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Ohm</font></b></dt></td>
<td><dt><font color="#000000">A unit of electrical resistance. Often
written or indicated by the Greek letter Omega.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Pedestal Mailbox</font></b></dt></td>
<td><dt><font color="#000000">A multi compartment mailbox mounted on
a steel or other secure pedestal for outdoor use. Typically in
condominium communities. Deep doors/compartments are similar to
‘horizontal’ style mailboxes. </font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Postal Approved</font></b></dt></td>
<td><dt><font color="#000000">Any mailbox approved by the Postmaster
General of The US Postal Service. Manufacturers must make
detailed submittals to Washington and conform to specific Size,
Material, and Safety specifications.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Privacy</font></b></dt></td>
<td><dt><font color="#000000">An intercom with privacy activated can
receive calls (listen), but the response is blocked for
privacy. </font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Recessed</font></b></dt></td>
<td><dt><font color="#000000">A mounting method requiring a cutout
be made into the finished wall or other surface. Recessed
equipment will be recessed into the wall so the mounted object
protrudes little from the face of the wall (see ‘flush’).</font> </dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Rectifier</font></b></dt></td>
<td><dt><font color="#000000">An electrical unit designed to convert
alternating current to direct current. </font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000"> Remote Station</font></b></dt></td>
<td><dt><font color="#000000">An intercom station which can respond
to a call from a master station. Remote stations may be equipped
with a call button for tone signalling only to a master station.
Also commonly referred to as ‘sub station’. </font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Resistance</font></b></dt></td>
<td><dt><font color="#000000">A measure of the difficulty in moving
electrical current through a medium when voltage is applied. It
is measured in ohms.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Riser</font></b></dt></td>
<td><dt><font color="#000000">A cable run used to connect a group of
intercom stations. Most commonly referred to in apartment
intercom systems where ‘vertical’ risers are most common.</font> </dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Selective Calling</font></b></dt></td>
<td><dt><font color="#000000">Ability to call a specific intercom
station by pressing that station’s selector button.
Communication at the calling master is push to talk, release to
listen. The called station may communicate hands-free.</font> </dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Selective Wire(s)</font></b></dt></td>
<td><dt><font color="#000000">Selective wires are used to uniquely
identify a specific intercom station. </font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Shield</font></b></dt></td>
<td><dt><font color="#000000">In cables, a metallic layer placed
around a conductor or group of conductors to prevent
electrostatic or electromagnetic interference between the
enclosed wires and external fields.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Sub Master</font></b></dt></td>
<td><dt><font color="#000000">Hybrid intercom station which, like
any remote (sub) station can receive a call from a master, but
may additionally be able to make an All Call, and/or answer a
call from a door station. Most common in Lee Dan’s TEK-COM common
talk intercom system. </font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Sub Station</font></b></dt></td>
<td><dt><font color="#000000">An intercom station which can respond
to a call from a master station. Sub stations may be equipped
with a call button for tone signalling only to a master station.
Also commonly referred to as ‘remote station’. </font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Surface Mount</font></b></dt></td>
<td><dt><font color="#000000">A mounting method utilizing the
finished surface of a wall as the anchor point. Surface mounted
stations or panels will protrude their full depth from the face
of the wall.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Switch</font></b></dt></td>
<td><dt><font color="#000000">A device placed in an electrical
circuit in order to make or break the flow of electrical
current.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Transformer</font></b></dt></td>
<td><dt><font color="#000000">A device for transferring energy in an
alternating current system from one circuit to another. Thus
energy at high voltage may be transformed to energy at low
voltage and vice-versa. Most intercom applications operate at
low voltage, and thus require a “step down” transformer to
reduce voltage to system specifications (most typically 16 or 24
volts).</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000"> Twisted Pair Cable</font></b> </dt></td>
<td><dt><font color="#000000">Cable with individually twisted pairs
of wires within a single jacket.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">UHF</font></b></dt></td>
<td><dt><font color="#000000">Abbreviation for ultra high frequency,
300 to 3,000 Mhz.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">U.L. </font></b></dt></td>
<td><dt><font color="#000000">Abbreviation of Underwriter’s
Laboratories, a nonprofit, independent organization which
operates a listing service for electrical and electronic
materials and equipment.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">USPS</font></b></dt></td>
<td><dt><font color="#000000">U.S. Postal Service</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000"> Vertical Mailbox</font></b> </dt></td>
<td><dt><font color="#000000">A multi compartment mailbox with tall
‘vertical’ doors/compartments. “Verticals” are less expensive
than ‘horizontal’ mailboxes, but generally require more wall
(width) space, and are not usually suited for larger
installations (100+ compartments).</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">VHF</font></b></dt></td>
<td><dt><font color="#000000">Abbreviation for very high frequency,
30 to 300 Mhz.</font></dt></td>
</tr>
<tr>
<td><dt><b><font color="#000000">Voltage</font></b></dt></td>
<td><dt><font color="#000000">The term most often used in place of
electromotive force, potential difference, or voltage drop to
designate the electric pressure that exists between two points
and is capable of producing a current when a closed circuit is
connected between two points. Analogous to the pressure in the
water pipes of your home.</font></dt></td>
</tr>
<tr>
<td><b><font color="#000000">Voltage Rating</font></b></td>
<td><font color="#000000">The highest voltage that m</font>ay be
continuously applied to a wire in conformance with standards or
specifications</td>
</tr>
</table>
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