Character stuffing
The problem with this method is that since the network layer may sometimes wish to send binary data, which may contain the ASCII codes for these characters, some way of distinguishing them is necessary
Here any time the sender’s data link layer encounters a DLE in the network layer’s data it places an extra DLE in front of it
When the recipient reads a DLE character in the incoming frame it strips it out and ignores the next character if it corresponds to a DLE