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Glossary

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Term Description
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.
Positive Logic A notation that indicates a logic 1 represents the active state for a signal.
PSE Acronym for Power Sourcing Equipment. A device that provides power on Ethernet cabling to PoE devices. See: PoE, Midspan, Endspan
Pull Down Resistor A resistor used to pull a logic input "down" to the low state, or logic-0 state, thus preventing a disconnected input from floating into an undetermined state.
Pull Up Resistor A resistor used to pull a logic input "up" to the high state, or logic-1 state, thus preventing a disconnected input from floating into an undetermined state.
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