Apparatus and method for checking network synchronization clock signal in communication system
AssigneeSamsung Electronics Co., Ltd.
InventorTae-Young Lee
Life of this patent
Estimating the term…
Abstract
In an apparatus and method for checking a network synchronization clock signal in a communication system, the apparatus generates a divided clock signal which is the same as an externally inputted network synchronization clock signal, compares the value of one period of the network synchronization clock signal to the value of one period of the divided clock signal, and determines whether the network synchronization clock signal is normal or not. Thus, the reliability of an operation of checking the network synchronization clock signal is enhanced.
Claims18
A network synchronization clock checking apparatus of a communication system, comprising:
- a clock generator for generating a reference clock signal having a predetermined frequency;
- a network synchronization clock unit for counting a number of reference clock signals generated for a time corresponding to a predetermined period of an externally inputted network synchronization clock signal so as to calculate a value of the predetermined period of the externally inputted network synchronization clock signal;
- a divided clock unit for generating a divided clock signal having a same frequency as the externally inputted network synchronization clock signal based on the reference clock signal, and for counting the number of reference clock signals generated for a time corresponding to a predetermined period of the divided clock signal so as to calculate a value of the predetermined period of the divided clock signal;
- and
- a comparator for comparing the value of the predetermined period of the externally inputted network synchronization clock signal to the value of the predetermined period of the divided clock signal so as to output an indication of whether the network synchronization clock signal is normal.
A method of checking a network synchronization clock signal in a communication system, the method comprising the steps of:
- generating a reference clock signal having a predetermined frequency;
- generating a divided clock signal having a same frequency as the network synchronization clock signal based on the reference clock signal when at least one network synchronization clock signal is inputted from an external source;
- counting a number of reference clock signals generated for a time corresponding to a predetermined period of the divided clock signal, and calculating a value of the predetermined period of the divided clock signal;
- counting a number of reference clock signals generated for a time corresponding to a predetermined period of the network synchronization clock signal, and calculating a value of the predetermined period of the network synchronization clock signal;
- and
- comparing the value of the predetermined period of the network synchronization clock signal to the value of the predetermined period of the divided clock signal, and determining whether the input network synchronization clock signal is normal.
Dependencies are inferred from the claim text.