Optical communications – Diagnostic testing – Determination of communication parameter
Reexamination Certificate
2006-04-11
2006-04-11
Chan, Jason (Department: 2633)
Optical communications
Diagnostic testing
Determination of communication parameter
C398S038000
Reexamination Certificate
active
07027730
ABSTRACT:
The invention provides a method for measuring transmission loss in an optical transmission line between a master station and a slave station, and also a slave station, a master station and a star network communication system using this method. Power of an optical signal is measured at a second end of an optical transmission line connected with an added slave station and at a first end other than the second end. The result at the first end is stored in a storing unit or transmitted to an incorporating unit by a transferring unit. The incorporating unit incorporates the result into a downstream optical signal, which is transmitted to the slave station. In the slave station an information extracting unit extracts the result from the downstream optical signal, and a processing unit calculates a difference between the measurement results of the first and second ends to obtain transmission loss therebetween.
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“Computer Networks” by A. Tanenbaum, Prentice-Hall, 1981, pp. 115-116.
Nagayama Akira
Shimizu Kazuyoshi
Chan Jason
Fujitsu Limited
Li Shi K.
Staas & Halsey , LLP
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