"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"

RESISTOR COLOR CODE. Resistor bands are either four or 5 bands on a resistor that indicate the resistor value and tolerance, 4-Band Resistor Color Code Table.

RESONANT LINE. A transmission line that has standing waves of current and voltage.

RETURN-to-ZERO. [RZ] A digital code having two information states, e.g., “0” and “1” or “mark” and “space”, in which code the signal returns to a rest state during a portion of the bit period.

RIBBON CABLE. Any cable constructed as a ribbon with parallel elements. 2. A fiber optic cable in which the optical fibers are held in grooves and laminated within a flat semi-rigid strip of material, such as plastic, that positions, holds, and protects them.

RIGID COAXIAL LINE. A coaxial line consisting of a central insulated wire (inner conductor) mounted inside of a tubular outer conductor.

RIP CORD. Of an optical cable, a parallel cord of strong yarn that is situated under the jacket(s) of the cable for the purpose of facilitating jacket removal preparatory to splicing or breaking out.

RISE TIME. In the approximation of a step function, the time required for a signal to change from a specified low value to a specified high value. Typically, these values are 10% and 90% of the step height. Pulse Rise Time Diagram