Optical communications – Multiplex – Broadcast and distribution system
Reexamination Certificate
2011-03-01
2011-03-01
Li, Shi K (Department: 2613)
Optical communications
Multiplex
Broadcast and distribution system
C398S154000
Reexamination Certificate
active
07899329
ABSTRACT:
On an optical access network, transmission at different bit rates is realized without modifying subscriber units. A low-speed signal generating part generates a low-speed signal having a low bit rate. A high-speed signal generating part generates a high-speed signal having a high bit rate. A recovery signal generating part generates a recovery signal. A multiplex part generates and sends a multiplexed signal obtained by multiplexing the low-speed signal, the high-speed signal, and the recovery signal. A reception processing part performs processing for receiving the multiplexed signal by extracting clocks from the low-bit-rate signal. When the reception processing part enters a free running state in response to receiving the high-speed signal, the recovery signal generating part generates the recovery signal at a low bit rate in order to recover clock synchronization from the free running state.
REFERENCES:
patent: 6633541 (2003-10-01), Hijikata et al.
patent: 2000-332808 (2000-11-01), None
patent: 2005-33537 (2005-02-01), None
S. Kobayashi et al., “Multi-Bit Rate Passive Double Star System Using Time-Unit Packet”, Journal of Lightwave Technology, vol. 19, No. 2, Feb. 2001.
Fujitsu Limited
Li Shi K
Staas & Halsey , LLP
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