Optical communications – Diagnostic testing – Determination of communication parameter
Reexamination Certificate
2007-10-23
2007-10-23
Singh, Dalzid (Department: 2613)
Optical communications
Diagnostic testing
Determination of communication parameter
C398S177000, C398S015000, C398S017000
Reexamination Certificate
active
11332860
ABSTRACT:
A method for switching a transmission route in an optical network. A regenerator station extracts a main signal, and detects the input level of the main signal. When the input level falls below a threshold, the regenerator station determines that a failure occurs, and stops output of a main signal from the regenerator station, and transmits a control signal indicating occurrence of the failure to a receiver station, which separates the control signal from a main signal transmitted thereto, detects the input level of the main signal at the receiver station, analyzes the separated control signal, and determines whether or not a failure occurs. When the input level of the main signal at the receiver station falls below a threshold, or when the separated control signal indicates occurrence of a failure, the receiver station detects the occurrence of the failure, and switches the transmission route.
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Maeda Takuji
Nakajima Ichiro
Sakamoto Takeshi
Shimada Yuji
Tomofuji Hiroaki
Fujitsu limited
Katten Muchin & Rosenman LLP
Singh Dalzid
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