Transmitting a digital signal and an additional signal

Details Transmitting a digital signal and an additional signal Transmitting a digital signal and an additional signal

1984-07-02

1989-05-02

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

371 52, H04J 312

Patent

active

048274755

ABSTRACT:
A digital signal, such as a t.d.m. PCM signal, is redundantly encoded in that sequences of n bits of the signal are transmitted as sequences of m bits, where m>n. Different sets of m-bit sequences are used to transmit the n-bit sequences in dependence upon the state of an additional signal, which may be a superframe indication signal. At a receiver, the digital signal and additional signal are reproduced. In the described embodiment =n+2, providing further redundancy to facilitate providing such desirable transmission code properties as maintaining d.c. balance and detecting errors on the transmission link.

REFERENCES:
patent: 4377860 (1983-03-01), Godbole
patent: 4519073 (1985-05-01), Bertocci et al.
patent: 4520480 (1985-05-01), Kawai

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