A common point of connection for telecommunications system and bonding to ground, which is located in the telecommunications closet or equipment room.

A collection of those telecommunications components excluding equipment, that together provides the basic support for the distribution of all information within a building or campus.

Telecommunication by means of a signal code.

Measurement with the aid of intermediate means that permits interpretation at a distance from the primary detector.

Cable used for transmission of information from instruments to the peripheral recording equipment.

In most cases this is formed by assembling a number of small cables consisting of two, three or four insulated copper or aluminum wires that are twisted together. Types include star quad, subscriber telephone cable, carrier frequency trunk telephone cables, coaxial cable and submarine telephone cable. Tubes and strip are used in coaxial cables.

This includes many different types of communication wire. It is a class of wires and cables, rather than a specific type.

Element, chemical symbol Te. A brittle, silvery-white metal produced commercially as a by-product of copper smelting and maintained in the tellurium-copper alloy to aid in machining. Enhances machinability when added to steel.

1) In heat treatment, this process increases the toughness and decreases the hardness of hardened steel or cast iron. It is also applied occasionally to normalized steel. This is done by heating to a temperature below the eutectoid temperature. 2) In tool steels, “temper” is sometimes used, but unadvisedly, to denote the carbon content. 3) In nonferrous alloys and in some ferrous alloys, the term is used to indicate the hardness and strength produced by mechanical and/or thermal treatment, and characterized by a certain structure, mechanical properties, or reduction in area during cold working. A given alloy may be in the fully softened or annealed temper, or it may be cold worked to the hard temper or further to spring temper. Intermediate tempers produced by cold working (rolling or drawing) are called “quarter hard,” “half-hard” and “three-quarters hard” and are determined by the amount of cold reduction and the resulting tensile properties.

See Stress-Relief Annealing.

The loss in impact resistance that is present in some low- and medium-carbon alloy steels when tempered in the range of 350°C to 600°C. It is revealed by the notched bar impact test but not the tensile test.

See TCR.

The maximum temperature at which a product is designed. For instance, it can designate the temperature that insulating material may be used in continuous operation without loss of its basic properties (e.g., operating, overload, short circuit).

The maximum stress which can be applied to a material at a given temperature without physical deformation.

The temperature of the surrounding medium, such as air around a cable.

The temperature at which a cable can be operated for a short time, with some loss of useful life.

The temperature to which a device is designed or rated for normal operating conditions. For cables, the maximum temperature for the conductor during normal operation.

The temperature to which a cable is rated for allowing the overcurrent protection to activate.

See Temper.

A grade of wire cloth produced in mesh counts ranging from 16 x 16 mesh thru 230 x 230 mesh. This is considered a light-weight grade.