Differences between revisions 3 and 4

CRC

A cyclic redundancy check (CRC) is an error-detecting code.

HDLC like framing

The http://www.ietf.org/rfc/rfc1662.txt has two examples of CRC calculations.

Polynom CRC-16: 0x8408 ( CRC-16-CCITT Reversed )

Polynom: x⁰ + x⁵ + x¹² + x¹⁶

Bisync, Modbus, USB, ANSI X3.28, SIA DC-07, many others; also known as CRC-16 and CRC-16-ANSI

Polynom: x¹⁶ + x¹⁵ + x² + 1

Normal	Reversed	Reversed reciprocal
0x8005	0xA001	0xC002

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