The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 31, 1999
Filed:
Sep. 10, 1997
Applicant:
Inventor:
Jae-Sul Ha, Seoul, KR;
Assignee:
Daewoo Telecom, Ltd., Incheon, KR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
375357 ; 375354 ; 371 277 ; 327 41 ;
Abstract
An apparatus for use in a synchronous transmission system, for detecting a failure of a clock signal, which comprises: a reference clock generator for generating a reference clock signal (RCS) in response to a reset signal issued by a system controller in the STS; and means for receiving a clock signal, the RCS issued by the reference clock signal generating means and the reset signal and for producing a failure signal for the received clock signal, wherein the failure represents a state of a clock in which the clock does not have a pulse for a predetermined time interval, the time interval being measured by using the RCS.