Method and apparatus for a simple calculation of CRC-10

A process and an apparatus to calculate the FCS (Frame Check Sequence) error checking code of packets payload sent over a fixed size packet networks in a network equipment sending said packets and to check said FCS in the network equipment receiving said packet; this invention applies to calculations of FCS based on CRC (Cyclic Redundancy Checking) codes generated by the polynomial generator of degree 10, G(X)=X10+X9+X5+X4+X+1. Particularly, this invention is for use in the ATM layer of ATM nodes processing OA&M and AAL3/4 ATM cells. The solution consists in using the calculation of the FCS based on the CRC code generated by the polynomial generator of degree 9, X9+X4+1 and simple operations. The calculation and the checking of the FCS is simple and thus the performance are improved authorizing the support of higher speed network lines.