Framing
Framing = How to break a bit-stream into frames
Need for framing: Error Detection/Control work on chunks and not on bit streams of data
Framing methods:
- Timing : risky. No network guarantees.
- Character count: may be garbled by errors
- Character delimiter and stuffing: Delimit frame with special characters
- Bit stuffing: delimit frame with bit pattern
- Physical layer coding violations