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US 5,490,150 AGranted
Method and apparatus for data parity in a transmission system
AssigneeAT&T Corp.
InventorsMichael W. Andrews, Michael P. Bottiglieri, Stephen J. Brolin
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Abstract
The integrity of a signal path through a transmission system (12), which processes successive blocks (14) of data during a given time frame, verified by establishing the parity of a selected one of the blocks as it enters and as it leaves the system. A lack of equality between the parities is indicative of a lack of path integrity.
Claims4
A method for detecting if integrity exists in a transmission path through a transmission system which processes each of a plurality of successive blocks of data during a given time frame, each block of data devoid of parity information, comprising the steps of:
- establishing a parity value of a selected one of the successive blocks of data upon entering the transmission system during each time frame;
- processing the successive blocks of data without reference to their parity by transmitting the blocks through the entire system;
- establishing a parity value of the selected block of data as it exits the transmission system, independent of the parity value of the selected block upon entering the transmission system;
- and
- comparing the parity value of the selected data block entering the transmission system to the parity value of the selected data block exiting the system, and indicating whether integrity exists in the transmission path in accordance with the difference between the established parities.
2 more elements
Dependencies are inferred from the claim text.