Optical communications – Multiplex – Broadcast and distribution system
Reexamination Certificate
2007-03-30
2009-02-10
Wang, Quan-Zhen (Department: 2613)
Optical communications
Multiplex
Broadcast and distribution system
Reexamination Certificate
active
07489869
ABSTRACT:
A station-side communication device connected to subscriber-side communication devices via an optical combining device; sending, to the subscriber-side communication devices, a distance measurement request signal; computing transmission delay times of optical signals from the individual subscriber-side communication devices by receiving distance measurement signals, and including: a threshold control part identifying the level of distance measurement signals; a signal detection part detecting breaks in the distance measurement signals from the threshold control part; a transmission granting part determining the timing at which transmission of optical signals is granted, and a reset timing generation part that, there is notification of detection of a break in the distance measurement signal from the signal detection part while it is being notified that distance measurement is carried out to and from the subscriber-side communication devices from the transmission granting part, sends a reset signal indicating that the voltage level is reset to the threshold control part.
REFERENCES:
patent: 2007/0237189 (2007-10-01), Miguel et al.
patent: 2007/0237520 (2007-10-01), DeLew et al.
patent: 2001-24598 (2001-01-01), None
patent: 2004-64494 (2004-02-01), None
“Gigabit-capable Passive Optical Networks (G-PON): Transmission convergence layer specification”, International Telecommunication Union, Feb. 2004, Chapters 8 and 9, G.984.3.
“Gigabit-capable Passive Optical Networks (GPON): General characteristics”, International Telecommunication Union, Mar. 2003, Chapter 10, G.984.1.
Kazawa Tohru
Ohira Masaki
Sakamoto Norihiro
Yajima Yusuke
Hitachi Communication Technologies Ltd.
McDermott Will & Emery LLP
Wang Quan-Zhen
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