1. The deterioration in quality, level, or standard of performance of a functional unit.
2. In communications, a condition in which one or more of the required performance parameters fall outside predetermined limits, resulting in a lower quality of service.
Note: Degradation is usually categorized as either "graceful" or "catastrophic. "

A 1-minute interval with a BER (bit error ratio) worse than 10:
6. The 1-minute intervals are derived by removing severely errored seconds from the total time and then consecutively grouping the remaining seconds into blocks of
6
0. [T1.507-1996]

The condition that exists when one or more of the required service performance parameters fall outside predetermined limits, resulting in a lower quality of service.
Note: A degraded service state is considered to exist when a specified level of degradation persists for a specified period of time.

A specified period of time during which bits are transferred from a source to a destination, where a bit error ratio worse than a specified threshold occurs. Severely errored units of time are excluded from the calculation. An example of a degraded unit of time is a degraded minute (DM). [T1.507-1996]

A dimensionless unit, expressed as a ratio, used to indicate the extent of coherence of an electromagnetic wave such as a lightwave. [After 2196]
Note 1: For lightwaves, the magnitude of the degree of coherence is equal to the visibility, V, of the fringes of a two-beam interference test, as given by where Imax is the intensity at a maximum… (Read More →)

In data transmission, the ratio of (a) the absolute value of the maximum measured difference between the actual and the theoretical intervals separating any two significant instants of modulation (or demodulation) to (b) the unit interval.
Note 1: These instants are not necessarily consecutive.
Note 2: The degree of isochronous distortion is usually expressed as a percentage.
Note 3: The… (Read More →)

1. In asynchronous data transmission, the ratio of (a) the absolute value of the maximum measured difference between the actual and theoretical intervals separating any significant instant of modulation (or demodulation) from the significant instant of the start element immediately preceding it to (b) the unit interval.
2. The highest absolute value of individual distortion affecting the significant instants of… (Read More →)

To modify a frequency-hopping signal so that it has a constant center frequency.

A device that reduces jitter in a digital signal.
Note 1: A dejitterizer usually consists of an elastic buffer in which the signal is temporarily stored and then retransmitted at a rate based on the average rate of the incoming signal.
Note 2: A dejitterizer is usually ineffective in dealing with low-frequency jitter, such as waiting-time jitter.

1. The amount of time by which an event is retarded.
2. The time between the instant at which a given event occurs and the instant at which a related aspect of that event occurs.
Note 1: The events, relationships, and aspects of the entity being delayed must be precisely specified.
Note 2: Total delay may be demonstrated by the… (Read More →)