Bit-oriented Protocol

High-Level Data Link Control (HDLC)

You have several components.

• Beginning and Ending Sequences
• Header
• Body
• CRC

3 Types of HDLC frames:

1. I-Frame: Information Frame (1st bit is $0$)
2. S-Frame: Supervisory Frame (1st two bits is $10$)
3. U-Frame: Un-numbered Frame (1st two bits is $11$) using frames,

Bit Stuffing?