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NA - see Numerical Aperture
N connector - A coaxial connector used for Ethernet 10Base5
thick coax segments.
Nanometer (nm) - One billionth of a meter.
Nanosecond (ns) - One billionth of a second.
NBR - Butadiene-acrylonitrile copolymer rubber, a material
with good oil and chemical resistance.
Near-End Crosstalk - Crosstalk between two twisted pairs
measured at the same end of the cable as the disturbing signal
source. NEXT is the measurement of interest for crosstalk specifications.
NEC - National Electrical Code.
NEMA - National Electrical Manufacturers Association.
Neoprene - A synthetic rubber with good resistance to
oil, chemical, and flame. Also called polychloroprene.
Network - An interconnection of computer systems, terminals
or data communications facilities.
Network Interface Card - A circuit board installed in
a computing device used to attach the device to a network. A
NIC performs the hardware functions that are required to provide
a computing device with physical communications capabilities.
Also Network Interface Unit (NIU).
NEXT - see Near-End Crosstalk.
NFPA - National Fire Protection Association
Nibble - One half byte or when one is hungry.
NIC - see Network Interface Card.
NIR - Near-end Crosstalk-to-Insertion Loss Ratio
Node - End point of a network connection. Nodes include
any device connected to a network such as file servers, printers,
or workstations
.
Noise - In a cable or circuit, any extraneous signal
which interferes with the desired signal.
Nomex - Dupont trademark for a temperature-resistant,
flame retardant nylon.
NRZ - Non Return to Zero.
NRZI - Non Return to Zero Inverted.
Numerical Aperture (NA) - The "light gathering ability"
of an optical fibre, defining the maximum angle to the fibre
axis at which light will be accepted and propagated.
NVP - Nominal Velocity of Propagation. The speed a signal
propagates through a cable expressed as a decimal fraction of
the speed of light in a vacuum.
Nylon - An abrasion resistant thermoplastic with good
chemical resistance. |
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