"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

I2C. Originally designed to be a battery control interface, now used in micro-controller based [uP] professional, consumer and telecommunications control, diagnostic and power management buses. The I2C bus uses a bi-directional Serial Clock Line [SCL] and Serial Data Lines [SDA]. Three speed modes are specified: Standard; 100kbps [Bits per Second], Fast mode; 400kbps, High speed mode 3.4Mbps. I2C is short for Inter-IC.

IDLE CHARACTER. A control character that is transmitted when no useful information is being transmitted.

IMPEDANCE. The total opposition offered to the flow of an alternating current. It may consist of any combination of resistance, inductive reactance, and capacitive reactance. The symbol for impedance is Z.

INCIDENT WAVE. The wave that strikes the surface of a medium. The wave that travels from the sending end to the receiving end of a transmission line.

INDUCTIVE COUPLING. The transfer of energy from one circuit to another by virtue of the mutual inductance between the circuits. Coupling of two coils by means of magnetic lines of force. In transformers, coupling applied through magnetic lines of force between the primary and secondary windings.

INPUT IMPEDANCE. Impedance presented to the transmitter by the transmission line and its load.

INPUT/OUTPUT. Pertaining to either input or output or both, especially in data processors.

ISDN. Integrated Services Digital Network. An integrated digital network in which the same time-division switches and digital transmission paths are used to establish connections for different services. [ISDN Description]