公开(公告)号：US3602898A

公开(公告)日：1971-08-31

申请号：US3602898D

申请日：1969-07-15

Applicant: INT STANDARD ELECTRIC CORP

Inventor： PAIN ROGER A ,  DELAIGUE SERGE ,  COGNE PIERRE H

IPC: G06F7/00 ,  G06F7/76 ,  G06F9/308 ,  G06F9/315 ,  H04Q3/545 ,  G06F5/00

CPC classification number: G06F9/30018 ,  H04Q3/54533

Abstract: A mask identification system according to which a mask indication is originated having three parts: one first part specifically meant to indicate the length of a slice; a second part specifically meant to indicate the origin of this slice; a third part which will either complete the first part, in order to characterize the lengths of larger slices (the value which characterizes the origin of the slice being then necessarily small), or it will complete the second part, in order to characterize the origins of upper ranks (the value characterizing the length of the slice being then necessarily small), so that most of the values that the mask indication take up in its entirety are effectively utilized and the number of digits making up this indication are limited to a minimum.

公开(公告)号：US3602900A

公开(公告)日：1971-08-31

申请号：US3602900D

申请日：1969-10-03

Applicant: INT STANDARD ELECTRIC CORP

Inventor： DELAIGUE SERGE ,  PAIN ROGER A ,  COGNE PIERRE H ,  RIEUX LOUIS H

IPC: G06F11/18 ,  G06F1/04 ,  G06F1/14 ,  G06F11/16 ,  G06F13/42 ,  G06F15/16 ,  G06F15/177 ,  H03K5/00 ,  H03K5/15 ,  H04L7/02 ,  G06F11/06

CPC classification number: G06F11/1679 ,  G06F1/14 ,  G06F11/2097 ,  G06F13/423

Abstract: In the duplicated data-processing systems, the clock of the ''''reserve'''' unit must normally be synchronized with the one of the ''''inline'''' unit, as long as this latter operates normally. According to the present invention, the clock of the ''''inline'''' unit originates a synchronizing signal periodically, and the clock of the ''''reserve'''' unit delimits a synchronization ''''window.'''' If the synchronizing signal falls into the synchronization window, the setting into synchronism of the ''''reserve'''' unit is made. If not, an alarm signal is given. In this arrangement, if the clock of the ''''inline'''' unit operates at an abnormal rhythm because of a failure, the clock of the reserve unit will not be synchronized to this abnormal rhythm.