Glossary
Term | Main definition |
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SRL Structural return loss | A measurement of the impedance uniformity of a cable. It measures energy reflected due to structural variations in the cable. The higher the SRL number, the better the performance; this means more uniformity and lower reflections.
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ST connector |
A fiber-optic connector with a bayonet housing; it was
developed by AT&T but is not in favor as much as SC or
FC connectors. It is used with older Ethernet 10Base-FL
and fiber-optic inter-repeater links (FIORLs).
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Stabilized light source |
An LED or laser diode that emits light with a controlled
and constant spectral width, central wavelength, and
peak power with respect to time and temperature.
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Stamped and formed | Stamp and Form Contact - The contact pin is formed into its shape from the sheet of material by using a press tool.
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Standards |
Mutually agreed-upon principles of protocol or procedure.
Standards are set by committees working under various
trade and international organizations.
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Star coupler |
A fiber-optic coupler in which power at any input port
is distributed to all output ports. Star couplers may have
up to 64 input and output ports.
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Star network |
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Star topology |
(1) A method of cabling each telecommunications outlet/
connector directly to a cross-connect in a horizontal
cabling subsystem. (2) A method of cabling each crossconnect
to the main cross-connect in a backbone cabling
subsystem. (3) A topology in which each outlet/connector
is wired directly to the hub or distribution device.
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Static charge |
An electrical charge that is bound to an object.
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Static load |
Load such as tension or pressure that remains constant
over time, such as the weight of a fiber-optic cable in a
vertical run.
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Station |
A unique, addressable device on a network.
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Stay cord |
A component of a cable, usually of high tensile strength,
used to anchor the cable ends at their points of termination
and keep any pull on the cable from being transferred
to the electrical conductors.
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Step index fiber |
An optical fiber cable, usually multimode, that has a uniform
refractive index in the core with a sharp decrease in
index at the core/cladding interface. The light is reflected
down the path of the fiber rather than refracted as in
graded-index fibers. Step-index multimode fibers generally
have lower bandwidths than graded-index multimode
fibers.
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Step insulated |
A process of applying insulation to a cable in two layers.
Typically used in shielded networking cables so that the
outer layer of insulation can be removed and the remaining
conductor and insulation can be terminated in a
connector.
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Step-index single-mode fiber |
A fiber with a small core that is capable of carrying light
in only one mode. Sometimes referred to as single-mode
optical fiber cable.
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