References
Glossary of Terms
NPN (Sinking)
PNP (Sourcing)
Resistance (Rl)
Acronym used to describe the polarization of a
bipolar junction transistor (BJTs). Also associated
with a sinking output.
Acronym used to describe the polarization of a
bipolar junction transistor (BJTs). Also associated
with a sourcing output.
The measurement of difficulty in moving electrical
current through a medium when voltage is applied. It
is measured in ohms.
NPN Output
PNP Output
Resistor
Transistor output that switches the common or
negative voltage to the load (current sinking)
connected between output and positive supply.
A transistor output that switches the positive voltage
to the load (current sourcing) connected between
output and common.
This is an electrical device, which opposes the flow
of current. Higher resistor Ohm values offer more
resistance to the flow of current.
Nylon
Polarization
Retractile Cord (Coiled Cord)
This is the generic name for synthetic fiber forming
polyamides.
The feature of a connector that prevents miss-
mating by allowing plugging to occur only when the
connectors are properly oriented.
A cord having a specially treated jacket or insulation,
so that it will retract like a spring. Retraction may be
added to all or part of a cord’s length.
O
Polyurethane (PUR)
Is a thermoplastic material with good natural
chemical resistance.
RF (Radio Frequency)
OFHC (Oxygen Free High Conductivity Copper)
RG/U (RG) (Radio Guide)
A military designation for a coaxial cable, and ‘U’
Ohm
The electrical unit of resistance. The value of
resistance by which a potential difference of one volt
will maintain a current of one ampere.
Polyvinyl Chloride (PVC)
Is a thermoplastic material with good specific
properties when blended with additives.
stands for Universal.
RGB (Red, Green, Blue)
3 parts of color video signal; also refers to multi
Ohm’s Law
E = I x R. Voltage (E) is directly proportional to the
product of current (I) and resistance (R) of circuit.
POM (Polyoxymethylene, Acetal, Delrin)
coaxial cables carrying the above signals.
Polyoxymethylene – a crystalline thermoplastic
polymer with a high melting point. It is suitable for
mechanical parts or electrical insulators that require
structural strength at above normal temperatures.
RJ45
Modular telecommunications connector.
Opto-Coupled
RMS (Root Mean Square)
Refers to a technique used to optically activate (turn
on) an electronic device usually a transistor or triac,
thus physically separating two sides of a circuit,
similar to a solenoid relay. The typical opto coupler
incorporates an LED (light emitting diode) as the
actuating device.
Potting
Rubber
This is the sealing of a cable termination or other
component with a liquid that thermo sets into an
elastomer.
A general term used to describe wire insulation
made of thermosetting elastomer, such as natural
or synthetic rubbers, neoprene, Hypalon, CPE butyl
rubber and others.
PUR (Polyurethane)
Broad class of polymers noted for good abrasion and
solvent resistance.
Output
S
The useful power or signal delivered by a circuit or
device.
SAE (Society of Automotive Engineers)
PVC (Polyvinyl Chloride)
A general purpose thermoplastic widely used for wire
and cable insulation and jackets.
P
SBR
A copolymer of styrene and butadiene. Most
commonly used type of synthetic rubber.
PA (Polyamide, Nylon)
PVDF (Polyvinylidene Fluoride)
PAL (Phase Alternate Line)
A European color TV system featuring 625 lines per
frame, 25 frames and 50 fields per second.
SDI (Serial Digital)
Digital information that is transmitted in serial form.
Q
R
SDL (Shielded Data Link)
Plastic
High polymeric substances, including both natural
and synthetic products, but excluding the rubbers,
that are capable of flowing under heat and pressure.
Receptacle
Separator
The connector is usually mounted in a fixed location
and mates with a plug type connector.
Pertaining to the wire and cable, a layer of textile,
paper, etc. which is placed between the outer jacket
and core construction to enhance jacket strip ability.
PLTC (Power Limited Tray Cable)
NEC classification for cable resistant to the spread
of fire and is suitable for use in cable trays at 300V
rating.
Rectification
This is a term used to describe an electrical process,
which converts AC (alternating current) to DC (direct
current).
Serve
A filament or group of filaments such as fibers or
wires, wound around a central core.
Plug
Reed Switch
This is a miniature mechanical switch, which
Shield
A connector associated with being attached to a
A conductive envelope around the primary
conductors that provides an electronic barrier to
electromagnetic interference.
cable.
changes states when a magnetic field is applied.
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