Method for operating and maintaining a clock of a system

Details Method for operating and maintaining a clock of a system Method for operating and maintaining a clock of a system

1990-09-04

1991-08-13

Miska, Vit W.

Horology: time measuring systems or devices

Combined with disparate device

368 46, 368155, 364569, G04B 4700, G04C 1100

Patent

active

050401580

ABSTRACT:
A method of operating and maintaining the clock of the system for determining a reference clock of the system when starting an operation and maintenance processor (OMP), comprises the steps of: a first step of requesting and receiving a hardware clock from a network synchronizing processor (NSP); a second step of checking if the received hardware clock does not fall between a predetermined minimum and a predetermined maximum, and if so, providing an alarm message which requires an operator to provide information on a reference clock and if not, requesting reference clocks from all of the processors except an operation and maintenance processor (OMP); and a third step of comparing the hardware clock and the received reference clocks as many times as the number of the received reference clocks, and determining the hardware clock as a reference clock of the system if a difference is less than or equal to a predetermined time for more than the predetermined number of times and if not, providing an alarm message which requires the operator to provide information on a clock as necessary to determine the reference clock of the system.

REFERENCES:
patent: 4321687 (1982-03-01), Parsons et al.
patent: 4376995 (1983-03-01), Shimizu
patent: 4415271 (1983-11-01), Mori
patent: 4573127 (1986-02-01), Korff
patent: 4903251 (1990-02-01), Chapman

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