公开(公告)号：JPH03104365A

公开(公告)日：1991-05-01

申请号：JP23343290

申请日：1990-09-05

Applicant: KOREA ELECTRONICS TELECOMM ,  KOREA TELECOMMUNICATION

Inventor： JIE SABU RII ,  PIYUN HOO IE ,  MI SUKU HAN

IPC: H04M3/22 ,  G04G7/00 ,  G06F1/14 ,  H04Q3/545

Abstract: PURPOSE: To maintain high reliability at the time of managing the time of an electronic exchange system by periodically inspecting the coincidence of system time, inspecting the maximum and minimum ranges of time to be referred to at the time of system time management and inspecting the system itself about time information. CONSTITUTION: A time management system in an exchange is provided with a 1st step for registering a timer to be started at a prescribed interval and requesting and receiving hardware time from a network synchronization processor 6 to a realtime generating circuit 7, a 2nd step for mutually comparing system time and time information received by the 1st step and inspecting whether or not a difference of more than a prescribed time exists between both the time information and a 3rd step for maintaining current time as it is and requesting hardware time adjustment, based on the system time when the number of time points including no difference more than the prescribed time value is more than a prescribed value. However, when the contents of the time information are mutually different, the system time based on preferential hardware time is redetermined. Consequently, stable and consistent time can be provided to all processors 1 to 6 which require time information.