Multiplex communications – Wide area network – Packet switching
Patent
1989-05-02
1990-10-16
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
371 501, 3701051, H04J 307
Patent
active
049641220
ABSTRACT:
A system for transmitting digital data by time division multiplex (TDM) includes a transmission terminal for transmitting a TDM data stream having a frame structure which includes fixed stuff bytes and/or frame overheads forming part of the payload but not normally available to the user. The system includes a processor for locating said fixed stuff bytes, and overwriting at least some of the fixed stuff bytes to introduce mark parity, and a receive terminal having a processor for detecting the introduced parity bytes and determining whether or not there has been an error in transmission. The processor at the receive terminal includes an AND-gate to which the transmitted TDM signal containing mark parity is fed, a clock for supplying a clock signal to the AND-date, a bistable flip-flop connected to the output of the AND-gate, and a band pass filter for filtering the output of the AND-gate.
REFERENCES:
patent: 3404372 (1968-10-01), Robbins
patent: 4644529 (1987-02-01), Amstutz et al.
patent: 4660202 (1987-04-01), Woodsum
patent: 4719624 (1988-01-01), Bellisio
patent: 4835768 (1989-05-01), Hubbard et al.
Berry Allan D.
Ferguson Stephen P.
Edwards Christopher O.
GEC-Plessey Telecommunications Limited
Olms Douglas W.
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