Optical communications – Multiplex – Optical local area network
Reexamination Certificate
2008-05-06
2008-05-06
Phan, Hanh (Department: 2613)
Optical communications
Multiplex
Optical local area network
C398S066000, C398S067000, C398S068000, C398S069000, C398S070000, C398S071000, C398S072000, C398S079000, C398S082000, C398S083000, C398S098000, C398S099000, C398S100000, C398S033000, C398S036000, C398S001000, C398S002000, C398S003000, C398S004000, C398S005000, C398S007000, C398S075000, C370S216000, C370S222000, C370S223000, C370S225000, C370S228000, C370S465000, C370S445000, C370S395520, C370S395530, C370S395400, C370S463000, C370S392000, C370S401000, C370S425000, C385S024000, C385S037000, C385S027000, C385S
Reexamination Certificate
active
07369769
ABSTRACT:
An Ethernet passive optical network (EPON) ring for providing protection against fiber failures. The optical network unit (ONU) is coupled to the ring fiber by a three-port passive optical splitting module that has three two-way optical passages. By the three two-way optical passages, the OUN receives/transmits data from/to the two ends of the optical line termination (OLT) to provide protection while the fiber failure. Moreover, it provides better authorization of users and simpler collision detection by the two-way transmission of the three-port passive optical splitting module to prevent hackers from invading and to reduce collisions.
REFERENCES:
patent: 6327400 (2001-12-01), Harstead et al.
patent: 6351582 (2002-02-01), Dyke et al.
patent: 6414768 (2002-07-01), Sakata et al.
Lin Kuan-Ming
Liu Jeffrey
Tseng Yen-Pin
Wang Ja-Nan
Yang Tzu-Jian
Birch & Stewart Kolasch & Birch, LLP
Industrial Technology Research Institute
Phan Hanh
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