To prevent the possibility of a DLE ETX sequence occurring within data stream, any occurrence of DLE is replaced by DLE DLE on transmission.

For example, one could frame data with FLAGS, and send DLE-F to mean FLAG and DLE-DLE to mean DLE when these characters occur within the frame.

For example a packet may be structured in the following way (DLE) (DLE) .

To prevent the possibility of a DLE ETX sequence occurring within data stream, any occurrence of DLE is replaced by DLE DLE on transmission.

In order to allow DLE to be sent in the header or text, the DLE is doubled.

The second mode utilizes a "transparent" block convention, similar to the ASCII DLE (Data Link Escape).

The second mode utilizes a "transparent" block convention, similar to the ASCII DLE (Data Link Escape).

DLE (Data Link Escape): A communication control character which will change the meaning of a limited number of contiguously following characters.

^P 16 10 DLE Data Link Escape Cause the following octets to be interpreted as raw data, not as control codes or graphic characters.

The data link escape character (DLE) was intended to be a signal to the other end of a data link that the following character is a control character such as STX or ETX.