Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Reexamination Certificate
2011-04-12
2011-04-12
Fureman, Jared J (Department: 2836)
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
Reexamination Certificate
active
07923863
ABSTRACT:
A system for line powering includes at least one office-end PSU, one standby PSU and one power switching unit. The office-end PSU provides power for a group of subscriber lines in a centralized manner. The power switching unit monitors the power supply status of the office-end PSU and controls the switching between the office-end PSU and standby PSU. In embodiments of the invention, different rectifier/boost circuits and different step-down circuits need not be set for each pair of subscriber lines between the office-end PSU and the remote device. When an office-end PSU fails to supply power, the standby PSU can be switched over quickly to supply power for the remote device, which cuts down the cost for designing the office-end PSU and the standby PSU while ensuring the reliability of power supply for the remote device.
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English Translation of Written Opinion of the International Searching Authority for PCT Application No. PCT/CN2006/000708, mailed Jul. 13, 2006, 3 pgs.
Jiang Tianli
Li Xianyin
Pan Xuefeng
Qin Zhen
Zhou Yingjie
Finnegan Henderson Farabow Garrett & Dunner LLP
Fureman Jared J
Huawei Technologies Co. Ltd.
Parries Dru M
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