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Glossary

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Term Description
Nagle's algorithm Reduces the number of network packets required to transmit a block of data by buffering the network MTU (up to 1500 bytes of data) or waiting up to 200 msec. When either condition is met, it sends the buffered data in one Ethernet packet. Also referred to as "nagling" and detailed by John Nagle in RFC 896.
NAND Gate A circuit that performs a NOT-AND operation based on the state of its inputs. This gate performs an AND operation and inverts (NOTs) its output.
Negative Logic A notation that indicates a logic 0 represents the active state for a signal.
Non Buffered An unbuffered signal that should not drive more than a few inputs within its logic family. See: Buffered.
NOR Gate A circuit that performs a NOT-OR operation based on the state of its inputs. This gate performs an OR operation and inverts (NOTs) its output.
Normally Closed (NC). Relay or switch contacts that normally form a complete low-resistance path for current flow. In an unenergized relay, a set of closed contacts.
Normally Open (NO). Relay or switch contacts that normally do not make contact. In an unenergized relay, a set of open contacts.
NPN A type of transistor often used as an on-off switch in electronic devices. An NPN switch usually sinks current from a higher potential through a device to ground.
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