Glossary

(1) Symbol for reactance. (2) Symbol often used on wiring diagrams to represent a cross-connect.

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.

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.

A generic description for the different DSL technologies such as ADSL, HDSL, RADSL. See also digital subscriber line.

An optical-fiber connector developed by OFTI; not in general use.