Multiplex communications – Wide area network – Packet switching
Patent
1981-10-13
1983-08-02
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
371 37, 371 42, 371 47, 370 13, 375108, 375116, H04J 306, H04L 704
Patent
active
043970206
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 muliplexed (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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"DS-1 Extended Framing Format, " pp. 1-7; DS-1 Extended Framing Format USITA Meeting at AT&T Co., Basking Ridge, NJ, Apr. 16, 1980.
Bell Telephone Laboratories Incorporated
Safourek Benedict V.
Stafford Thomas
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