Communications: electrical – Digital comparator systems
Patent
1973-11-13
1976-06-22
Shaw, Gareth D.
Communications: electrical
Digital comparator systems
G06F 1546, G05B 1502, G05B 1902
Patent
active
039654575
ABSTRACT:
A digital control processor for controlling a number of relay sets from digital information received from a digital PABX. The digital control processor consists essentially of a first-in first-out memory and a combinational logic unit. The memory stores information relevant to an operation to be performed by the processor and re-cycles the information until the operation has been performed. The memory determines the action of the combinational logic unit which action includes changing the state of one of the relay sets. The action of the combinational logic unit is determined by time varying data states from the memory and/or from a relay set or sets. The digital control processor acts as an interface device between the digital/electronic world of the PABX and the analogue/mechanical world of the public exchange. The device receives digital information from a processor in the PABX and also monitors the current state of all the relay sets. The device accepts a digital signal from the PABX processor in a short time, which information relates to an action to be performed by one of the relay sets and may include information indicating a digit to be transmitted to line in the form of impulses. The device then causes the relevant relay set to perform the desired action without further reference to the PABX processor. The device is capable of locating the relay set which has been in a particular state for the longest period of time upon request from the PABX processor for a relay set in that state.
REFERENCES:
patent: 3079589 (1963-02-01), Mol et al.
patent: 3245006 (1966-04-01), Mattlet
patent: 3651484 (1972-03-01), Smeallie
patent: 3727006 (1973-04-01), Jacob
patent: 3753243 (1973-08-01), Ricketts, Jr. et al.
L.M. Ericsson Pty. Ltd.
Sachs Michael C.
Shaw Gareth D.
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