AMI - technical definition

A line coding technique used in T1 networking. AMI is a bipolar transmission method that reverses the polarity of alternate marks, or 1 bits, expressing the first as a positive voltage of +3V, the second as a negative voltage of 3V, the third as +3V, and so on. Zero bits are coded as 0V. See Figure A-5. See also bipolar, mark, polarity, signal, and voltage.