System for line powering

Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source

Reexamination Certificate

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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.

REFERENCES:
patent: 5946617 (1999-08-01), Portaro et al.
patent: 6459171 (2002-10-01), Leifer
patent: 6690718 (2004-02-01), Kim
patent: 2003/0048004 (2003-03-01), Fleming et al.
patent: 1285680 (2001-02-01), None
patent: 1481110 (2004-03-01), None
patent: 98/08288 (1998-02-01), None
patent: 2005/036815 (2005-04-01), None
patent: 2005/046198 (2005-05-01), None
English Translation of Written Opinion of the International Searching Authority for PCT Application No. PCT/CN2006/000708, mailed Jul. 13, 2006, 3 pgs.

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