Optical access network system

Details Optical access network system Optical access network system

2006-01-20

2008-11-25

Phan, Hanh (Department: 2613)

Optical communications

Multiplex

Broadcast and distribution system

C398S066000, C398S067000, C398S068000, C398S069000, C398S070000, C398S071000, C398S079000, C398S202000, C398S208000, C398S209000, C398S025000, C398S026000, C398S027000, C398S033000, C398S100000, C370S389000, C370S420000, C370S432000, C370S442000, C370S436000, C725S121000, C725S125000, C725S127000, C725S129000, C725S106000

Reexamination Certificate

active

07457542

ABSTRACT:
An optical access network system having a function of correcting upstream signal waveform distortions occurring in the PON section, wherein a central office side apparatus comprises a main controller to notify each subscriber connection apparatus of a transmission grant period, an equalizer of a tap gain adaptive control type to correct waveform distortions of signals received from the subscriber connection apparatuses, an equalizer controller, and a parameter table for storing, for each subscriber connection apparatus, the initial values of tap gains to be set for the equalizer. The main controller issues a switchover request for switching the equalization characteristic to the equalizer controller each time notifying a subscriber connection apparatus of a transmission grant period, and the equalizer controller retrieves the initial values of the tap gains for the subscriber connection apparatus from the parameter table in response to the switchover request, and sets these values to the equalizer.

REFERENCES:
patent: 6647210 (2003-11-01), Toyoda et al.
patent: 7127167 (2006-10-01), Sala et al.
Tetsuya Yokotani et al., “Queuing Models for Media Access Control on PON”, The Institute of Electronics, Information and Communication Engineers (IEICE), Technical Report, Nov. 2003, in Japanese with English abstract, pp. 7-10.
Tetsuya Yokotani et al., “Media Access Control in PON system for Optical Access Network”, The Institute of Electronics, Information and Communication Engineers (IEICE), Technical Report, Jun. 2003, in Japanese with English abstract, pp. 7-12.

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