Optical LAN device

Details Optical LAN device Optical LAN device

2007-11-13

2007-11-13

Phan, Hanh (Department: 2613)

Optical communications

Multiplex

Optical local area network

C398S059000, C398S066000, C398S067000, C398S068000, C398S069000, C398S070000, C398S071000, C398S072000, C398S003000, C398S009000, C398S010000, C398S016000, C398S017000, C398S177000, C398S181000, C398S033000, C398S030000, C398S031000, C398S022000, C398S023000, C398S024000, C398S079000

Reexamination Certificate

active

10934859

ABSTRACT:
An ring type optical LAN device includes a master node and a plurality of slave nodes that are interconnected by an optical fiber cable. A plurality of optical bypass transmission lines are provided in correspondence with each one of the slave nodes. Each of the optical bypass transmission lines bypasses the corresponding one of the slave nodes. Each slave node includes an E/O converter and an optical cutoff circuit. Each of the E/O converters is controlled to flash for generating an optical signal, which is transmitted to a network. When any one of the slave nodes fails such that the corresponding E/O converter is maintained in a turned on state, the associated optical cutoff circuit forcibly switches the E/O converter to a turned off state. This suppresses a network crash caused by the failure maintaining the E/O converter in the turned on state.

REFERENCES:
patent: 5317198 (1994-05-01), Husbands
patent: 6199174 (2001-03-01), Norizuki et al.
patent: 6452701 (2002-09-01), Terahara et al.
patent: 6807370 (2004-10-01), Harasawa
patent: 57092934 (1982-06-01), None
patent: 11-313098 (1999-11-01), None

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