The Protocol : AX25

• Flag Field

  • The flag field is one octet long. Since the flag is used to delimit frames, it occurs at both the beginning and end of each frame. As a result of bit stuffing this sequence is not allowed to occur anywhere else inside a complete frame

• Address Field

  • The address field is used to identify both the source of the frame and its destination

• Control Field

  • The control field is used to identify the type of frame being passed and control several attributes of the level 2 connection

• PID Field

  • The Protocol Identifier (PID) field shall appear in information frames (I and UI) only. It identifies what kind of layer 3 protocol, if any, is in use.

• Information Field

  • The information field is used to convey user data from one end of the link to the other.

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