Glossary

A professional accreditation granted by BICSI (the Building Industry Consulting Service International). RCDDs have demonstrated a superior level of knowledge of the telecommunications wiring industry and associated disciplines.

An electrical box that is designed to clamp to the wallboard, as opposed to a

(1) A device that receives, amplifies (and reshapes), and retransmits a signal. It is used to overcome attenuation by boosting signal levels, thus extending the distance over which a signal can be transmitted. Repeaters can physically extend the distance of a LAN or connect two LAN segments.

In DC (direct current) circuits, the opposition a material offers to current flow, measured in ohms. In AC (alternating current) circuits, resistance is the real component of impedance and may be higher than the value measured at DC.

A measure of the inequality of the resistance of the two conductors of a transmission line.

(1) The ratio of a detector

Remote Electrical Tilt is the addition of AISG control system to enabling tilting of the antennas from a Remote location, other than the site itself.

Generic term for AISG cable assemblies.

Motorised device that adjust electrical tilt of an antenna.

The process of disconnecting, then reconnecting a cable to a termination point (possibly moving the cable in the process).

A cord with a specially treated insulation or jacket that causes it to retract like a spring. Retractile cords are commonly used between a telephone and a telephone handset.

See Snap fit

The ratio of reflected power to inserted power. Return loss is a measure of the signal reflections occurring along a channel or basic link and is related to various electrical mismatches along the cabling. This ratio, expressed in decibels, describes the ratio of optical power reflected by a component, for instance a connector, to the optical power introduced to that component.

Light energy that is reflected from the end of a fiber through Fresnel reflection.

A digital coding scheme where the signal level is low for a 0 bit and high for a 1 bit during the first half of a bit interval; in either case, the bit returns to zero volts for the second half of the interval.