H - Electricity – 04 – M
Patent
H - Electricity
04
M
344/80.1, 344/1.
H04M 3/24 (2006.01) G06F 11/00 (2006.01) G06F 11/20 (2006.01) G06F 11/34 (2006.01) H04M 15/00 (2006.01) H04M 15/04 (2006.01) H04Q 1/20 (2006.01) H04Q 3/545 (2006.01) G06F 11/22 (2006.01) G06F 11/273 (2006.01)
Patent
CA 1094209
ABSTRACT OF THE DISCLOSURE Data processing equipment suitable for recording details of manually connected telephone calls has a plurality of operator stations with keyboards and visible display units (VDU's) connected in groups to operator's control units which respond to keyed instructions to obtain data from peripheral units storing such data and for recording on magnetic tape cartridges the details of the calls. The control units and peripheral units each include micro- processors for controlling their functions and are arranged to execute tests to determine the operational states of the units and produce signals indicating those states. A monitor unit is connected to all of the units to receive signals indicating the operational states of the units. Each unit may include a watch-dog timer having a counter which is regularly incremented and periodically reset to zero in response to a software instruction so that if a central processing unit gets into a software loop the counter exceeds a threshold value and produces a signal indicating the presence of such a loop. The watch-dog timer may be used to reset the central processing unit to a datum position, erasing all data recorded up to the time as a result of programme execution. A diagnostic unit may be provided enabling an engineer to try out test routines on the units to ensure their correct functioning.
273125
Brinkman Barrie L.
Hodson Robert D.
Newton Peter J.
Norbury David G.
Windsor David V.
Fetherstonhaugh & Co.
Post Office (the)
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