1. In the modulation of a carrier, a change from one significant condition to another.
Note 1: Examples of signal transitions are a change from one electrical current, voltage, or power level to another; a change from one optical power level to another; a phase shift; or a change from one frequency or wavelength to another.
Note 2: Signal transitions… (Read More →)

A group of bits forming a separately transferable entity used to convey information on a signaling link. [T1.226-1992]

The alignment that exists when flags are received at intervals that correspond to integral numbers of octets and that fall within certain upper and lower limits. [T1.110-1987]

A procedure by which the error rate of an active signaling link is measured on the basis of a count of correctly checking and erroneous signal units. [T1.110-1987]

Procedures used at Level 2 to ensure that message signal units are transported in sequence, without loss or duplication, over a particular signaling link. [T1.110-1987]

See SINAD.

At a given point in a communications system, the ratio of (a) the power of the desired signal plus the noise to (b) the power of the noise.
Note: The (S+N)/N ratio is usually expressed in dB.

A current-carrying return path from a load back to the signal source, i.e., the low side of the closed loop energy transfer circuit between a source-load pair.

The term "Signal-to-C-Notched Noise Ratio" denotes the ratio in dB of a test signal to the corresponding C-Notched Noise.

At a specified point in a circuit, the ratio of the power of the wanted signal to the power of the unwanted signal from another channel.
Note 1: The signals are adjusted in each channel so that they are of equal power at the zero transmission level point in their respective channels.
Note 2: The signal-to-crosstalk ratio is usually expressed… (Read More →)