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Error correcting method and apparatus |
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Signal transmitter and signal quality monitoring device |
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2003-11-04 |
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Alarm detection apparatus |
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Transmission device and system having the same |
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2001-03-13 |
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Add-drop multiplexer with enhancement of accessibility to signals in different hierarchical levels and flexibility in various services and circuit setting operations |
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Transmission system |
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1996-11-12 |
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Apparatus for detecting error in a communications line |
Masahiro Shinbashi |
1996-04-02 |
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Method of changing over path switch in optical transmission device |
— |
1995-08-29 |
| 5319488 |
Terminal equipment and optical communication system using the same |
— |
1994-06-07 |
