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Term Main definition
(1) Symbol for reactance. (2) Symbol often used on wiring diagrams to represent a cross-connect.
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Also referred to as Crossover lead.
A twisted-pair patch lead wired in such a way as to route the transmit signals from one piece of equipment to the receive signals of another piece of equipment, and vice versa.

The opposite of a crossover cable is the straight-through cable.

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X.21 connector, this is D15W connector with a very specific pin configuration.  That is to say a D type connector with 15 pins that must be identified and connected in a specific order.

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A generic description for the different DSL technologies such as ADSL, HDSL, RADSL. See also digital subscriber line.
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An optical-fiber connector developed by OFTI; not in general use.
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