Glossary:

ATIS Telecom Glossary

Search Keyword By: F

Select a term name to open its entry and any media references. Longer definitions end with a “Read More” link.

Fiber-to-the-Node (FTTN)

Typically either a VDSLx or ADSLx architecture where fiber is run deeply into a neighborhood to increase the bit-rate; however, the last few thousand feet are still over the existing copper.

Fiber-to-the-Premises (FTTP)

Fiber goes directly all the way to the home, apartment complex, or small business. This is a more generic term than FTTH (Home), since typically these architectures are used for more than just homes.

fidelity

The degree to which a system, or a portion of a system, accurately reproduces, at its output, the essential characteristics of the signal impressed upon its input or the result of a prescribed operation on the signal impressed upon its input.

FidoNet

A network designed for e-mail distribution through individual bulletin board systems rather than through Internet servers.

field

1. The volume of influence of a physical phenomenon, expressed vectorially.
2. On a data medium or in storage, a specified area used for a particular class of data, e.g., a group of character positions used to enter or display wage rates on a screen.
3. Defined logical data that are part of a record.
4. The elementary unit of… (Read More →)

field intensity

The irradiance of an electromagnetic wave under specified conditions.
Note: Field intensity is usually expressed in watts per square meter.

field strength

1. The magnitude of an electric, magnetic, or electromagnetic field at a given point.
Note: The field strength of an electromagnetic wave is usually expressed as the rms value of the electric field, in volts per meter. The field strength of a magnetic field is usually expressed in amperes per meter Synonym radio field intensity.
2. The electric field strength… (Read More →)

field wire

A flexible insulated wire used in field telephone and telegraph systems.
Note 1: WD-1 and WF-16 are types of field wire.
Note 2: Field wire usually contains conductors and high-tensile-strength strands serving as strength members.

field-disturbance sensor

A restricted radiation device which establishes a radio frequency field in its vicinity and detects changes in that field resulting from the movement of persons or objects within the radio frequency field. Examples: microwave intrusion sensors; devices that use rf energy for production line counting and sensing. [NTIA]

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