ocr: lbyte lbyte 1b oyte 2 bytes Variable 20r1 bytes Frame Flag Address Control Protocol Data Check Sequence (FCS) Figure 1.1 PPP frames are composed of six fields. The Flag is a fixed pattern that delimits frames. The Address and Control fields are also fixed values. The Protocol field provides a layer of indirec- tion SO that the Data field can represent various actions and responses as well as user data. The Frame Check Sequence (FCS) field provides 16- or 32-bit error tracking.
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