Method and apparatus for providing integral cell payload...

Details Method and apparatus for providing integral cell payload... Method and apparatus for providing integral cell payload...

H - Electricity

04

L

H04L 1/20 (2006.01) H04L 12/56 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2308643

A method for verifying the integrity of data payloads of ATM cells passing through a switching device involves computing a payload integrity verification code for the payload portion of an ATM cell and passing the payload integrity verification code along a data path in a telecommunications device with the ATM cell. The payload integrity verification code may be generated according to any error detection or error correction scheme including CRC, check sum, BIP or the like. In preferred embodiments of the invention, the payload integrity verification code is stored in a portion of the standard ATM cell header which is not used during the period while the cell is passing through the telecommunications device. Preferably the payload integrity verification code is stored in all, or a portion of, the virtual path identifier or virtual connection identifier fields within the standard ATM cell header. In most telecommunications devices the function of the VPI and VCI fields are replaced by a connection identifier field which is appended to the cell while the cell is passing through the telecommunications device. The invention allows for the immediate identification of cells having corrupted payload data. In preferred embodiments of the invention where the payload integrity verification code applies only to the payload data and wherein there is separate check data applying to the ATM header fields, different actions can be taken on the detection of errors in the ATM cell header and ATM cell payloads respectively.

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