PPT Slide

Packet Structure, continued...

TRAINING

SEQUENCE

IDLE

FLAG

FCS

(CRC-16)

DATA

BUFFER

FLAG

IDLE

• 8 bits.

• Allow RF power to reach nominal level.

• Allow frequency to stabilize.

TRAINING

SEQUENCE

• 24 or 32 bits.

• For fetching data clock.

FLAG

• HDLC flags (01111110), 8 bits.

• Start and end flag identical.

FLAG

FCS

(CRC-16)

• 16 bits.

• Uses CRC-16 (CCITT).

BUFFER

• 24 bits.

• Propagation integrity to 202 nm.

• Jitter allowance.

• Bistuffing and repeater bits.

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