Glossary

Occurs when the power level drops below the standard level. Opposite of power overage.

The ratio of the attenuation (signal) to the power-sum measurement of alien crosstalk in the far end (noise); a requirement of ANSI/TIA-568-C.2 for Category 6A cables.

The ratio of attenuation to power-sum far-end crosstalk; a requirement of ANSI/TIA-568-C.2; formerly known as power-sum equal-level far-end crosstalk (PSELFEXT)

A short, thick glass rod that forms the basis for an optical fiber during the manufacturing process. The preform is created first, and then melted and drawn under constant tension to form the long, thin optical fiber.

Fusing the end of a fiber-optic cable with a low current to clean the end; it precedes fusion splicing.

A telecommunications term for the space occupied by a customer or an authorized/joint user in a building on continuous or contiguous property that is not separated by a public road or highway.

The entire wiring system on a user

Wiring that is installed before walls and ceilings are enclosed. Prewiring is usually easier than waiting until the walls are built to install wire.

As defined by the ISDN standard, consists of 23 B-channels (64Kbps each) and one 64Kpbs D-channel (delta channel) in the United States, or 30 B-channels and one D-channel in Europe.

The specialized coating applied to the surface of the fiber cladding during manufacture.

Generic term referring to scope and requirements under a specific Project or Contractual arrangements.

The difference in time between when a signal is transmitted and when it is received.

A device that limits damaging voltages on metallic conductors by protecting them against surges and transients.

A set of predefined, agreed-upon rules and message formats for exchanging information among devices on a network.

A software and hardware troubleshooting tool used to decode protocol information to try to determine the source of a network problem and to establish baselines.