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Glossary

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Term Main definition
IEEE 802.2 Logical Link Control
The IEEE standard that provides specifications for the operation of the Logical Link Control (LLC) sublayer of the OSI data link layer. The LLC sublayer provides an interface between the MAC sublayer and the Network layer.
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IEEE 802.3 CSMA/CD Networking
The IEEE standard that specifies a network that uses a logical bus topology, baseband signaling, and a CSMA/ CD network access method. This is the standard that defines Ethernet networks. See also Carrier Sense Multiple Access/Collision Detect.
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IEEE 802.4 Token Bus
The IEEE standard that specifies a physical and logical bus topology that uses coaxial or fiber-optic cable and the token-passing media access method.
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IEEE 802.5 Token Ring
The IEEE standard that specifies a logical ring, physical star, and token-passing media access method based on IBM
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IEEE 802.6 Distributed Queue Dual Bus (DQDB)
Metropolitan Area Network The IEEE standard that provides a definition and criteria for a metropolitan area network (MAN), also known as a Distributed Queue Dual Bus (DQDB).
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IEEE 802.7 Broadband Local Area Networks
The IEEE standard for developing local area networks (LANs) using broadband cabling technology.
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IEEE 802.8 Fiber-Optic LANs and MANs
The IEEE standard that contains guidelines for the use of fiber optics on networks, including FDDI and Ethernet over fiber-optic cable.
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IEEE 802.9 Integrated Services (IS) LAN Interface
The IEEE standard that contains guidelines for the integration of voice and data over the same cable.
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Impact test
Used to determine a cable
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Impedance
The total opposition (resistance and reactance) a circuit offers to the flow of alternating current. It is measured in ohms and designated by the symbol Z.
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Impedance match
A condition where the impedance of a particular cable or component is the same as the impedance of the circuit, cable, or device to which it is connected.
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Impedance matching transformer
A transformer designed to match the impedance of one circuit to another.
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Impedance mismatch
A condition where the impedance of a particular cable or component is different than the impedance of the device to which it is connected.
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Incident angle
The angle between the subject light wave and a plane perpendicular to the subject optical surface.
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Incoherent light
Light in which the electric and magnetic fields of photons are completely random in orientation. Incoherent light is typically emitted from lightbulbs and LEDs.
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