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US 2005/0031346 A1Published application
Optical switching apparatus, optical transmission system and method of setting up for optical signal route
AssigneeHitachi, Ltd.
InventorsSunao Kakizaki, Hideaki Tsushima, Shigeki Kitajima, Yasuyuki Fukashiro, Takashi Mori
Life of this patent
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Abstract
In an optical switching apparatus having redundantly-arranged optical switches, a route switching operation mode, an autonomic redundant switching operation mode and a compulsory redundant switching operation mode are discriminated from one another so that these operation modes are prevented from being executed at the same time, and also proper mask processing is performed at every switching operation mode. Therefore, emission of an undesired alarm and thus occurrence of malfunction when each switching operation is carried out can be prevented.
Claims3
1-16. cancelled.
An optical switching apparatus comprising:
- an optical switch which has plural input portions and plural output portions, carries out switching of a rout of an optical signal to transmit the optical signal from an arbitrary input portion among said plural input portions to an arbitrary output portion among said plural output portions, monitoring portions each of which monitors the optical signal from one of the plural output portions of said optical switch and transmits a signal based on the result of the monitoring,
- a controller which receives the signals from said monitoring portions and instructs the optical switch to switch according to the signal thus received, wherein,
- said controller has a storing portion which stores in advance, that an output portion which is compulsorily switched in the case that the switching of said optical switch is compulsorily carried out, and
- when said switching has been compulsorily carried out and the signal is received from said monitoring portion, said controller discriminates whether said monitoring portion which outputted the signal monitors the optical signal outputted from the output portion stored in said storing portion.
1 more element
An optical switching apparatus comprising:
- a plurality of branching portions each of which switches a destination of an inputted optical signal to any one of two output portions.
- a first optical switch to which an optical signal outputted from one of the two output portions of said branching portion is inputted and which outputs said optical signal from an arbitrary output portion among a plurality of output portions.
- a second optical switch to which an optical signal outputted from the other of the two output portions of said branching portion is inputted and which outputs said optical signal from an arbitrary output portion among a plurality of output portions.
- a plurality of selecting portions each of which receives an optical signal from one of the output portions of said first optical switch and an optical signal from one of the output portions of said second optical switch respectively, and selects one from the two optical signals thus received to and output it,
- monitoring portions each of which monitors an optical signal between one of said branching portions and one of said selecting portions and outputs a signal according to the result of said monitoring, and
- a controller which received the signals from said monitoring portions and instructs at least one of the branching portions and the selecting portions that whether an inputted optical signal is to be outputted from which output portion or whether an optical signal to be outputted is to be inputted from which input portion, according to said signal thus received, wherein,
- said controller has a storing portion which stores in advance, that a branching portion or selecting portion is compulsorily switched in the case that switching of the branching portions or the selecting portions is compulsorily carried out, and
- when said switching has been compulsorily carried out and the signal is received from said monitoring portion, said controller discriminates whether said monitoring portion which outputted the signal monitors the optical signal outputted from the branching portion or to said selecting portion stored in said storing portion.
5 more elements
Dependencies are inferred from the claim text.