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:
Oct. 31, 2000
Filed:
Dec. 02, 1998
KDD Corporation, Tokyo, JP;
Abstract
There is provided a transmission line switch-over control system capable of significantly improving the nonoperational situation such as circuit disconnection during call or call quality deterioration without conducting unnecessary switch-over of a circuit or a transmission line. A line quality input data handler 5 acquires at least one transmission line quality data out of a received level, a received C/N, and a bit error rate of a normal transmission line 3 and sends it to a forecaster 6. The forecaster 6 produces estimated data of situation of transmission line based on the input quality data of the transmission line. A switch-over controller 7 presumes possibility that the line quality will deteriorate within a predetermined time such as, for example, the mean call holding time. If the presumed possibility of deterioration is larger than a predetermined decision threshold, the switch-over controller effects control so as to switch over the normal transmission line 3 to a back-up transmission line 4. On the other hand, if the possibility of deterioration of the normal transmission line 3 becomes smaller than the above described decision threshold when the back-up transmission line 4 is in use, the switch-over controller effects control so as to switch back to the normal transmission line 3.