Demultiplexer of a digital signal transmission apparatus

Details Demultiplexer of a digital signal transmission apparatus Demultiplexer of a digital signal transmission apparatus

1987-04-13

1988-10-11

Griffin, Robert L.

Multiplex communications

Wide area network

Packet switching

375112, H04J 306

Patent

active

047776340

ABSTRACT:
A method for the recovery of a plesiochronic data signal is provided, whereby the received sum signal generated upon application of what is referred to as pulse stuffing is divided into a synchronous data signal and into an additional data signal in a demultiplexer. A data bit likewise transmitted in the additional data signal is inserted into the synchronous data signal in a format converter on the basis of stuffing information transmitted in the additional data signal or, respectively, a bit is purged from the synchronous data signal. The stuffing information is composed exclusively of phase words which, in digital form, contain the momentary phase relationship between the sum signal and the plesiochronis data signal. A command evaluation stage forwards control signals to the format converter when the extreme values of the phase words are transgressed, the bits being inserted into the synchronous data signal or, respectively, purged from the synchronous data signal by way of the control signals.

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Kuhne et al, "Positiv-Null . . . Datensignale", Frequenz, vol. 32, No. 10, 1978, pp. 281-287.

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