Transmitting additional signals using violations of a redundant

Details Transmitting additional signals using violations of a redundant Transmitting additional signals using violations of a redundant

1980-11-28

1983-10-04

Curtis, Marshall M.

Multiplex communications

Wide area network

Packet switching

3701104, 370 11, 178 23A, 178 69G, H04J 306

Patent

active

044083254

ABSTRACT:
At a transmitter of a digital transmission system which uses a redundant transmission code to transmit data, at least one predetermined code combination which occurs randomly in the encoded data is selectively modified, to form a predetermined code violation, in dependence upon an additional signal which is to be transmitted. At a receiver, the predetermined code violation is detected and corrected to reproduce the additional signal and the data. By selection of appropriate code combinations and violations more than one additional signal can be transmitted. The arrangement is particularly suitable for transmission of additional signals, which may comprise protection switching signals or a digital voice channel signal, via fiber optic transmission links using 2AMI encoding.

REFERENCES:
patent: 3475723 (1969-10-01), Burton et al.
patent: 3764987 (1973-10-01), Schulze
patent: 3787613 (1974-01-01), Farmer et al.
patent: 4101739 (1978-07-01), Mueller
patent: 4131761 (1978-12-01), Giusto
patent: 4215245 (1980-07-01), Bellisio

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