Unit for the simultaneous switching of digital information and s

Details Unit for the simultaneous switching of digital information and s Unit for the simultaneous switching of digital information and s

1975-08-25

1976-12-14

Brown, Thomas W.

179 15BS, H04J 306

Patent

active

039977285

ABSTRACT:
A switching unit for a multiplex pulse code modulation transmission system formed of incoming and outgoing multiplex digital circuits divided into a number of frame locking, information and signalling time slots. The information time slots are grouped in frames and contain information octets and the signalling time slots are grouped in multiframes and contain two signalling demi-octets. A transmission channel is defined by the recurrent information time slots having a given serial number in the frame and the octets contained therein and the recurrent signalling time slots having a given serial number in the multiframe and the first or the second demi-octets contained therein. The switching unit of the invention switches both the information octets and the signalling demi-octets of a selected transmission channel. Switching comprises writing and reading the information octets in and out of information buffer stores and writing and reading the signalling demi-octets in and out of signalling buffer stores. Since there are two demi-octets and only one octet per frame, the reading rate would have to be two times higher for the signalling than for the information. The reading rate is equalized for both information and signalling switching by reading the signalling demi-octets during both the frame locking time slots and the signalling time slots.

REFERENCES:
patent: 3564144 (1971-02-01), Diggelmann et al.
patent: 3794773 (1974-02-01), Jacob et al.

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