Glossary
| Term | Main definition |
|---|---|
| Source address |
The address of the station that sent a packet, usually
found in the source area of a packet header. In the case
of LAN technologies such as Ethernet and Token Ring,
the source address is the MAC (media access control)
address of the sending host.
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| Spectral bandwidth |
(1) The difference between wavelengths at which the
radiant intensity of illumination is half its peak intensity.
(2) Radiance per unit wavelength interval.
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| Spectral width |
A measure of the extent of a spectrum. The range of
wavelengths within a light source. For a source, the
width of wavelengths contained in the output at one half
of the wavelength of peak power. Typical spectral widths
are between 20nm and 170nm for an LED and between
1nm and 5nm for a laser diode.
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| Spectrum |
Frequencies that exist in a continuous range and have
a common characteristic. A spectrum may be inclusive
of many spectrums; the electromagnetic radiation spectrum
includes the light spectrum, the radio spectrum,
and the infrared spectrum.
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| Speed of light (c) |
In a vacuum, light travels 299,800,000 meters per second.
This is used as a reference for calculating the index of
refraction.
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| SPID Service profile identifier | The ISDN identification number issued by the phone company that identifies the ISDN terminal equipment attached to an ISDN line.
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| Splice |
(1) A permanent joint between two optical waveguides.
(2) Fusing or mechanical means for joining two fiber ends.
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| Splice enclosure |
A cabinet used to organize and protect splice trays.
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| Splice tray |
A container used to organize and protect spliced fibers.
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| Split pair |
A wiring error in twisted-pair cabling where one of a
pair
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| Splitter | Generic term for a passive device that splits one RF transmission path into two, normally full band (3dB loss)
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| Splitting ratio |
The ratio of power emerging from two output ports of a
coupler.
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| Spontaneous emission |
The emission of random photons (incoherent light) at the
junction of the p and n regions in a light-emitting diode
when current flows through it. Occurs when a semiconductor
accumulates spurious electrons. Spontaneous
emission interferes with coherent transmission
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| Spontaneous emission |
The emission of random photons (incoherent light) at the
junction of the p and n regions in a light-emitting diode
when current flows through it. Occurs when a semiconductor
accumulates spurious electrons. Spontaneous
emission interferes with coherent transmission
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| SRF | Supply Request Form – details the required free issue equipment / materials.
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