The power per individual telegraph channel required to yield the standard composite data level.
Note: For example, for a composite data level of -13 dBm at 0-dBm transmission level point (0TLP), the STL would be approximately -25 dBm for a 16-channel VFCT terminal computed from STL = - (13+10log10 n), where n is the number of telegraph channels and the… (Read More →)

A single-frequency signal with standardized level used for testing the peak power transmission capability and for measuring the total harmonic distortion of circuits or parts of a circuit.
Note: Standardized test signal levels and frequencies are listed in MIL-STD-188-100 and in the Code of Federal Regulations, Title 47, part 68.

A single-frequency signal with a standardized level generally used for level alignment of single links and of links in tandem.
Note: For standardized test signal levels and frequencies, see MIL-STD-188-100 for DOD use, and the Code of Federal Regulations, Title 47, part 68 for other Government agencies.

In the United States, standard time and frequency signals, broadcast on very precise carrier frequencies by the U. S. Naval Observatory and the National Institute of Standards and Technology (NIST), formerly the National Bureau of Standards (NBS).
Note: The Radio Regulations (RR) define an identical international service as standard frequency and time signal service.

1. A profile that specifies one or more interoperable open systems interconnection stacks that are intended to cover one or more specific functional areas.
Note: Examples of standardized profiles are the ISO standardized profiles and the NATO standardized profiles.
2. A balloted, formal, harmonized document that specifies a profile [POSIX.0].

Documents, established by consensus and approved by a recognized body that provides, for common and repeated use, rules, guidelines, or characteristics for activities or their results, aimed at the achievement of the optimum degree of order in a given context [POSIX.0].

An organization that develops standards and is accredited by its National Body, as appropriate [POSIX.0]

1. In computer and communications systems operations, pertaining to a power-saving condition or status of operation of equipment that is ready for use but not in use.
Note: An example of a standby condition is a radio station operating condition in which the operator can receive but is not transmitting.
2. Pertaining to a dormant operating condition or state of… (Read More →)

In a transmission line, a wave in which the distribution of current, voltage, or field strength is formed by the superposition of two waves propagating in opposite directions, and which wave is characterized by a series of nodes (maxima) and anti-nodes (minima) at fixed points along the transmission line.
Note: A standing wave may be formed when a wave is… (Read More →)

The ratio of the amplitude of a standing wave at an anti-node (minimum) to the amplitude at an adjacent node (maximum).
Note 1: The standing wave ratio (SWR) in a uniform transmission line is given by where is the reflection coefficient.
Note 2: Reflections occur as a result of discontinuities, such as an imperfection in an otherwise uniform transmission line,… (Read More →)