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Glossary

All A B C D E F G H I L M N O P R S T U V W Z

Term	Description
Optical Isolator	See: Opto Coupler
Opto Coupler	A device that uses light emissions to cause an isolated output stage to turn on. This device allows detection and sensing of potentially dangerous or high voltage signals, while providing isolation and protection to the circuitry sensing them.
Opto Isolator	See: Opto Coupler
OR Gate	A circuit that performs an OR operation based on the state of its inputs.
Overload Protection	The capability to protect a circuit when current exceeds a predetermined value. Devices such as fuses or circuit breakers automatically disconnect a load when they sense an overcurrent.
PCB	Printed Circuit Board.
PEG	Acronym for PCI Express Graphics. A PCI-SIG standard port definition for computer graphics adapters.
PNP	A type of transistor often used as an on-off switch in electronic devices. A PNP switch usually sources current from a positive supply to a device at a lower potential.
PoE	Acronym for Power over Ethernet. The technology for transmitting electrical power and data on the same Ethernet cable. Governed by IEEE 802.3 standards, which specify the maximum power allowed for connected devices.
Port	A collection of signals that go to or from a computer for the input or output of information. For example, an 8-bit input port or a serial port.

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