Glossary

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1000Base LX
The name for Gigabit Ethernet that is transmitted over fiber using long wave transmitters.
1000Base SX
The name for Gigabit Ethernet that is transmitted over fiber using short wave laser transmitters.
1000Base T
The name for Gigabit Ethernet transmitted over a twisted pair.
100Base FX
A 100 Mbps Ethernet system based on 4B/5B signal encoding that is transmitted over fiber optic cable.
100Base T
A term used for the entire 100 Mbps Fast Ethernet system, including both twisted-pair and fiber optic media types....
10Base F
A 10 Mbps Ethernet system based on Manchester signal encoding transmitted over fiber optic cable.
10Base T
A 10 Mbps Ethernet system based on Manchester signal encoding transmitted over Category 3 or higher twisted-pair cable.
10Base2
A 10 Mbps Ethernet system based on Manchester signal encoding transmitted over thin coaxial cable; also known as thinwire...
10Base5
A 10 Mbps Ethernet system based on Manchester signal encoding transmitted over thick coaxial cable; also known as thicknet....
10Gig Fiber Optic Patch Cord
A laser optimized fiber that supports 10 Gigabit per second transmission for distances of 300 meters or more and...
802.1
An IEEE working group for high-level interfaces, network management, inter-networking and other issues common across LAN technologies.
802.3
An IEEE working group for carrier-sense multiple access/carrier detect Local Area Networks.
802.3 Network
A 10 Mb/s CSMA/CD bus-based network; is commonly referred to as Ethernet.
802.5 Network
A token-passing ring network that operates at 4 Mb/s or 16 Mb/s.
8B10B Encoding
A signal modulation scheme in which eight bits are encoded in a 10-bit word to ensure that too many...
Abaxial Spherical Aberration
This type of aberration occurs when a patch of light is formed on points outside of the lens axis....
Abbe Condenser
This condenser consists of two lenses that collect and direct light onto a predetermined object. It can achieve high...
Abbe Constant
The ratio of an optical medium's refractivity to its dispersion. It is the reciprocal of dispersive power.
Abbe Illumination
A form of illumination where the source is imaged directly onto the object being viewed or projected. This requires...
Abbe Prism
A type of roof prism with perpendicular end faces that can invert an image when inserted between the object...
Abbe Refractometer
An optical instrument used to measure the of index of refraction of an unknown sample of optical glass. Designed...
Abbe Sine Condition
A condition that must be met by any spherically corrected lens if it is to be free from coma...
Abbe-Porro Prism
A compact version of the traditional Porro prism used in binoculars.
ABCD Matrix
Also known as a ray transfer matrix, this is a 2-by-2 matrix describing the effect of an optical element...
Aberration
A deviation from what is normal or expected. In optics, this could be a defect in a lens system...