Title:
LOW ELECTRIC LIGHT BEAM NET UNIT
Document Type and Number:
Japanese Patent JPH088836
Kind Code:
A
Abstract:
PURPOSE: To provide an optical network unit for a switched network. CONSTITUTION: An optical network unit(ONU) 12 used for a passive optical switched network uses a high contrast rate between the energy of a calling optical signal and that of a question optical signal. The receiver of the ONU 12 is operated in a low power operation mode until communication between a central station and a subscriber is desired. In the low power mode, a photodetector is operated in an optical battery mode, and a detection capacitor is charged. The calling optical signal transmitted by the central station when communication through the ONU 12 is desired generates a voltage signal to be detected by a comparator circuit. The comparator which is triggered switches the receiver on, and transmits the output of a photodiode to the receiver, and the receiver processes the received communicated signal. The ONU 12 is restored to a low power state based on the end of the calling. When an off-hook signal is detected, the ONU 12 interrupts the question signal, and indicates that communication started by the subscriber through the ONU 12 is desired to the central station.
Inventors:
NIKORASU JIEE FURIGO
Application Number:
JP13460995A
Publication Date:
January 12, 1996
Filing Date:
June 01, 1995
Export Citation:
Assignee:
AT & T CORP
International Classes:
H04B10/24; H04B10/00; H04B10/02; H04B10/26; H04J14/02; (IPC1-7): H04B10/24
Attorney, Agent or Firm:
Masao Okabe (2 outside)
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