Multiplex communications – Wide area network – Packet switching
Patent
1984-01-17
1986-02-04
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 66, 370 85, 3701101, H04Q 1104, H04J 312
Patent
active
045690405
ABSTRACT:
A control system for a time division multiplex digital switching exchange has a number of telephony groups located on separate shelves which are interconnected by an intershelf bus. The intershelf bus comprises two address buses and a data bus. A common control computer inserts addressing data into two registers in a digital switch controller (DSC) which uses that data to control the transfer of data between telephony groups by way of the intershelf bus. The DSC also includes transmit and receive registers connected to the data bus which allows the transfer of data to and from the shelves and the common control computer. Should the common control computer require to read data from the DSC it addresses the DSC as one of the shelves (i.e., inserts the address of the DSC in the two registers of the DSC) to cause the DSC to transfer or read data to or from the transmit and receive register.
REFERENCES:
patent: 3996566 (1976-12-01), Moran
patent: 4187399 (1980-02-01), Mayfield et al.
patent: 4408323 (1983-10-01), Montgomery
patent: 4430733 (1984-02-01), Hardy et al.
Boot Gordon P.
O'Toole Anthony J. P.
Kuntz Curtis
Olms Douglas W.
Plessey Overseas Limited
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