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I am trying to implement the ADS-L protocol in my application, but I did not fully understand it yet.

Data link layer (page 13):

  • Why CRC is at offset (Packet Length +1)Bytes if the CRC is included in the "Packet Length" of the first byte?

Network layer (page 16).

  • In the bullet points it is written that the network layer also contains a payload lenght indicator but the table below does not show any indicator.
  • Is the "(Packet Length - 3) * 8" the same length then in the table of the data link layer?

My interpretation would look like this: enter image description here

What is my fault that the offsets do not match for me. Do I use the correct specification because on some pages issue 1 and on some pages issue 4 is written.

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