The average number of units of data, such as bits, characters, blocks, or frames, transferred per unit time from a source and accepted as valid by a sink.
Note: The effective data transfer rate is usually expressed in bits, characters, blocks, or frames per second. The effective data transfer rate may be averaged over a period of seconds, minutes, or… (Read More →)

The date by which routing and rating changes within the PSTN must be complete for the assigned thousands-block or the assigned CO Code. Also, the date by which the thousands-block becomes an active block. (Also referred to as “the LERG Routing Guide effective date. ”)

The radius of a hypothetical Earth for which the distance to the radio horizon, assuming rectilinear propagation, is the same as that for the actual Earth with an assumed uniform vertical gradient of atmospheric refractive index.
Note: For the standard atmosphere, the effective Earth radius is 4/3 that of the actual Earth radius.

1. The height of the center of radiation of an antenna above the effective ground level.
2. In low-frequency applications involving loaded or nonloaded vertical antennas, the moment of the current distribution in the vertical section divided by the input current.
Note: For an antenna with symmetrical current distribution, the center of radiation is the center of distribution. For an… (Read More →)

The source noise temperature in a two-port network or amplifier that will result in the same output noise power, when connected to a noise-free network or amplifier, as that of the actual network or amplifier connected to a noise-free source.
Note: If F is the noise figure numeric and 290 K the standard noise temperature, then the effective noise temperature… (Read More →)

The arithmetic product of (a) the power supplied to an antenna and (b) its gain.

For an optical fiber, the square of the product of the diameter of the near-field pattern and the sine of the radiation angle of the far-field pattern. The diameter of the near-field radiation pattern is defined here as the full width at half maximum and the radiation angle at half maximum intensity.
Note: Effective mode volume is proportional to the… (Read More →)

The product of the power supplied to the antenna and its gain relative to a short vertical antenna in a given direction. [RR]

In alternating-current power transmission and distribution, the product of the rms voltage and amperage, i.e., the apparent power, multiplied by the power factor, i.e., the cosine of the phase angle between the voltage and the current.
Note: Only effective power, i.e., the actual power delivered to or consumed by the load, is expressed in watts. Apparent power is properly expressed… (Read More →)

1. The power supplied to an antenna multiplied by the antenna gain in a given direction.
Note 1: If the direction is not specified, the direction of maximum gain is assumed.
Note 2: The type of reference antenna must be specified.
2. The product of the power supplied to the antenna and its gain relative to a half-wave dipole in… (Read More →)