Glossary
Term | Main definition |
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Short wavelength |
In reference to light, a wavelength shorter than 1000nm.
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SI units |
The standard international system of metric units.
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Signal |
The information conveyed through a communication
system.
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Signal encoding |
The process whereby a protocol at the Physical layer
receives information from the upper layers and
translates all the data into signals that can be transmitted
on a transmission medium.
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Signal-to-noise ratio (SNR or S/N) |
The ratio of received signal level to received noise level,
expressed in decibels and abbreviated SNR or S/N. A
higher SNR ratio indicates better channel performance.
The relationship between the usable intended signal
and the extraneous noise present. If the SNR limit is
exceeded, the signal transmitted will be unusable.
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Signaling |
The process of transmitting data across the medium.
Types of signaling include digital and analog, baseband
and broadband.
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Silica glass |
Glass made mostly of silicon dioxide used in conventional
optical glass that is used commonly in optical fiber
cables.
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Silicone |
A General Electric trademark for a material made from
silicon and oxygen. Can be in thermosetting elastomer or
liquid form. The thermosetting elastomer form is noted
for high heat resistance.
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Silver satin cable |
The silver-gray voice-grade patch cable used to connect
a telephone to a wall jack such as that used by home telephones.
Silver satin cables are unsuitable for use in LAN
applications because they do not have twisted pairs, and
this results in high levels of crosstalk and capacitance.
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Simplex |
(1) A link that can only carry a signal in one direction.
(2) A fiber-optic cable or cord carrying a single fiber.
Simplex cordage is mainly used for patch cords and temporary
installations.
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Simplex cable |
A term sometimes used to describe a single-fiber cable.
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Simplex transmission |
Data transmission over a circuit capable of transmitting
in only one direction.
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Single polarization fibers |
Optical fibers capable of carrying light in only one
polarization.
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Single polarization fibers |
Optical fibers capable of carrying light in only one
polarization.
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Single-board computer |
A circuit board containing the components needed for
a computer that performs a prescribed task. A singleboard
computer is often the basis of a larger piece of
equipment that contains it.
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