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Alternate Mark Inversion Code

Tool to decode/encode with AMI. The (bipolar) Alternate Mark Inversion is a line coding for binary signal with a 3-level system representing logical ones by an impulsion with alternative positive or negative polarity.

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Alternate Mark Inversion Code -

Tag(s) : Communication, Line Coding

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# Alternate Mark Inversion Code

## AMI Line Encoder

Tool to decode/encode with AMI. The (bipolar) Alternate Mark Inversion is a line coding for binary signal with a 3-level system representing logical ones by an impulsion with alternative positive or negative polarity.

### How to encrypt using Alternate Mark Inversion?

For each logical zero, 0 is coded, and for each logical one, a polarity impulsion is coded: alternatively (+ or -), beginning generally by +.

Example: Consider the signal 101, 1 is coded +, 0 nothing happens => 0 and 1 make the polarity change: - is coded. So 101 is line coded +0-

### How to decrypt Alternate Mark Inversion line code

Decryption process is easier: each + or - corresponds to a logical 1, the rest (the zeros) is 0.

Example: +0- is decoded 101

### How to recognize an Alternate Mark Inversion coded signal?

The signal must have three levels, that can be coded with 3 distinct characters, generally +, - and 0.

There is never two consecutive upper or lower levels.

### How to begin with a negative polarity?

One can add a starting 1 to the plain signal, and delete the first + of the coded signal.

### When Alternate Mark Inversion has been invented?

In the 60's, after the T1 (T-carrier level 1).