Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate
2005-06-28
2005-06-28
Eng, George (Department: 2643)
Telephonic communications
Subscriber line or transmission line interface
Power supply
C379S395010, C379S401000, C379S413010
Reexamination Certificate
active
06912282
ABSTRACT:
An apparatus and method for enabling Cisco legacy power to support IEEE 802.3 AF standard power. A network power system capable of delivering data terminal equipment power via a media dependent interface includes power source equipment according to Cisco legacy power and at least one powered device according to IEEE standard power. A power compatibility module is inserted between the power source equipment and the powered device to enable the power source equipment to appear according to IEEE standard power and the powered device to appear according to Cisco legacy power. The module includes switches, a DC/DC converter, an IEEE power source equipment circuit, and an isolator. The module optionally includes a user signaling device for communicating operating conditions of the module to a user. The module may be connected to two ports of the power source equipment to supply adequate power levels to the powered device.
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Mitchell, Robert L., Legacy Equipment May Raise Compatibility Issues for 802.3af, May 26, 2003, printed from http://www.computerworld.com/printthis/2003/0,4814,81443,00.html on Aug. 6, 2004.
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Cisco Tehnology, Inc.
Eng George
Pham Tuan
Ritchie David B.
Thelen Reid & Priest LLP
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