Glossary

The European version of T-1 data circuits. Runs at 2.048Mbps.

The European version of T-3 data circuits. Runs at 34.368Mbps.

A term for zero reference ground (not to mention the planet most of us live on).

An LED that produces light through an etched opening in the edge of the LED.

Everything Everywhere joint venture between Deutsche Telecom (T-Mobile UK) and France Telecom (Orange UK)

The bandwidth of a particular optical fiber cable, connections and splices, and transmitter combination. This can be measured in a complete channel.

The calculation of the EMB from the optical fiber

The value of bandwidth used in the IEEE 802.3ae model that corresponds to the fiber specification.

A rack with a standard dimension per EIA. See also 19-inch racks.

The ability of a system to minimize radiated emissions and maximize immunity from external noise sources.

The combined electric and magnetic field caused by electron motion in conductors.

Protection from the interfering or damaging effects of electromagnetic radiation such as radio waves or microwaves.

Electrical noise generated in copper conductors when electromagnetic fields induce currents. Copper cables, motors, machinery, and other equipment that uses electricity may generate EMI. Copper-based network cabling and equipment are susceptible to EMI and also emit EMI, which results in degradation of the signal. Fiber-optic cables are desirable in environments that have high EMI because they are not susceptible to the effects of EMI.

An alliance of manufacturers and users that establishes standards and publishes test methodologies. The EIA (with the TIA and ANSI) helped to publish the ANSI/ TIA/EIA-568-B cabling standard.

The transfer of energy by means of a varying electrostatic field. Also referred to as capacitive coupling.