Error monitoring in digital transmission systems

Details Error monitoring in digital transmission systems Error monitoring in digital transmission systems

H - Electricity

04

J

363/10.1

H04J 3/14 (2006.01) H04L 1/00 (2006.01) H04L 7/04 (2006.01)

Patent

CA 1156384

HOWSON-3 - 18 - ERROR MONITORING IN DIGITAL TRANSMISSION SYSTEMS Abstract Errors in digital transmission are monitored by employing a cyclical-redundancy-check (CRC). In a transmitter, a CRC code word having a predetermined number of bits is generated from a block of bits of a presently transmitted time division multiplexed signal. The code word bits are then inserted into predetermined bit positions of the next subsequent block of bits of the XTDM signal. In a receiver, bits of a presently received time division multiplexed signal are compared to bits of a CRC code word generated from the last previously received block of bits to indicate errors in transmission. In a specific example, a 6-bit CRC code word is employed and the code word bits are inserted into predetermined framing bit positions.

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