Telecommunications – Carrier wave repeater or relay system – Failure compensation
Patent
1998-12-02
2000-10-31
Urban, Edward F.
Telecommunications
Carrier wave repeater or relay system
Failure compensation
34082501, 455 63, H04B 336
Patent
active
061415324
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.
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Kishi Yoji
Konishi Satoshi
Mizuike Takeshi
Jackson Blane J.
KDD Corporation
Urban Edward F.
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