Error monitoring in digital transmission systems
Number of patents in Portfolio can not be more than 2000
United States of America
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Apr 28, 1992
Grant Date -
N/A
app pub date -
Jul 31, 1989
filing date -
Sep 11, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Errors in digital transmission are monitored by employing a cyclical-redundancy-check (CRC). A CRC code word having a predetermined number of bits is generated (via 310) from a block of bits (ESF) of a presently transmitted time division multiplexed (XTDM) signal. The code word bits are then inserted (via 304, 305, 306) into predetermined bit positions of the next subsequent block of bits (ESF) of the XTDM signal. In a receiver (FIG. 7), bits of a presently received time division multiplexed (RTDM) signal are compared (801, 802) 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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