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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) : Telecom,Line Coding

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Alternate Mark Inversion Code

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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.

Answers to Questions

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 (+ ou -), beginning generally by +.

Let the signal be 101.

1, + is coded,

0, 0 is coded,

1, - is coded

101 is line coded +0-

How to decrypt Alternate Mark Inversion line code

Decryption process is easier: each + or - correspond to a logical 1, the rest is 0.

+0- is decoded 101.

How to recognize an Alternate Mark Inversion coded signal?

The signal must have three levels and 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).

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