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Glossary

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Term Main definition
Jabber
A term used with Ethernet to describe the act of continuously sending data or sending Ethernet frames with a frame size greater than 1,518 bytes. When a station is jabbering, its network adapter circuitry or logic has failed, and it has locked up a network channel with its erroneous transmissions.
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Jack
A receptacle used in conjunction with a plug to make electrical contact between communication circuits. A variety of jacks and their associated plugs are used to connect hardware applications, including cross-connects, interconnects, information outlets, and equipment connections. Jacks are also used to connect cords or lines to telephone systems. A jack is the female component of a plug/jack connector system and may be standard, modified, or keyed.
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Jacket
The outer protective covering of a cable, usually made of some type of plastic or polymer.
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Jacketed ribbon cable
A cable carrying optical fiber in a ribbon arrangement with an elongated jacket that fits over the ribbon.
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Jitter
A slight movement of a transmission signal in time or phase that can introduce errors and loss of synchronization. More jitter is introduced when cable runs are longer than the network-topology specification recommends. Other causes of jitter include cables with high attenuation and signals at high frequencies. Also called phase jitter, timing distortion, or intersymbol interference.
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Joint
Any joining or mating of a fiber by splicing (by fusion splicing or physical contact of fibers) or connecting.
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