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Glossary

Term Description
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.
Reed Relay A small relay comprising two magnetic contacts within a sealed glass envelope. When energized, a coil around the envelope moves the contacts to make a low-resistance connection. See: Relay.
Relay A device that opens or closes a circuit under control of a separate and isolated circuit. A mechanical relay uses a coil to actuate mechanical contacts. A solid state relay uses electronic devices to open or close circuit paths. Both types of relays isolate the controlling circuit from the circuit the relay controls.
Resistance The total amount of opposition to current in a circuit. Resistance carries the units of ohms and the Greek symbol omega, Ω. Resistance values may have units of kilohms, kΩ or megohms MΩ. See: Resistor.
Resistor A device that opposes or limits current flow. Usually noted in schematic diagrams as R. See: Resistance.
RFC-2217 A subprotocol of Telnet that added the abilities to (1) send com port configuration information, (2) send modem control signal updates, and (3) manage flow control.
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