Multiplex communications – Network configuration determination
Reexamination Certificate
2008-07-01
2008-07-01
Chan, Wing (Department: 2616)
Multiplex communications
Network configuration determination
C370S276000, C370S437000, C370S526000, C398S025000, C398S042000
Reexamination Certificate
active
07394771
ABSTRACT:
In optical two-way communication using a single optical fiber, part of the light transmitted from an apparatus is received as stray light by the apparatus itself. This occasionally hampers accurate detection of disconnection from the partner apparatus and of the start of data communication by the partner apparatus after the establishment of connection. To overcome this, the timing with which an apparatus transmits a tone signal after the establishment of connection is compared with the timing with which the apparatus receives a tone signal from the partner apparatus, and the two apparatuses use different sets of data transmission properties (for example, different wavelengths) to accurately detect disconnection. Moreover, based on the properties of the received light and the characteristics of the receiving amplifier, repetition of the same code for longer than a predetermined period is detected to accurately detect disconnection. Furthermore, in response to a request for data communication after the establishment of connection, a tone signal having a different pattern from that used to establish connection is used to accurately detect the start of data communication.
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Fukae Fumihiro
Ichikawa Yuji
Nakano Daisuke
Nishimura Takashi
Sumi Kazuyuki
Birch & Stewart Kolasch & Birch, LLP
Chan Wing
Roberts Brian
Sharp Kabushiki Kaisha
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