ALEXANDRIA, Va., July 9 -- United States Patent no. 7,974,586, issued on July 5, was assigned to Extreme Broadband Engineering LLC (Millstone Township, N.
J.).
"Constant Input Port Impedance for Catv Amplifier with Passive Modem Port" was invented by Robert L. Romerein (Pontypool, Canada) and Jay F. Shapson (Englishtown, N.
J.).
According to the abstract released by the U.
S. Patent & Trademark Office: "A passive directional coupler is receptive of VoIP, Internet, and video/data signals, and is used in a CATV amplifier device to couple the video/data signals from a cable drop input port to the input terminal of an amplifier, and to passively bypass the VoIP and Internet signals to a modem port, for insuring continuous connection of the VoIP and Internet signals to the a modem of a user connected to the modem port, regardless of the loss of power to the amplifier or the failure of the amplifier, in one embodiment of the invention. In another embodiment, a switching circuit is responsive to the loss of power to the amplifier, for electrically connecting a 75 ohm resistor between a source of reference potential, and the common connection between the directional coupler and the amplifier, for maintaining a 75 ohm impedance at the directional coupler output to the common connection. In a preferred embodiment, the switching circuit also opens the common connection between the directional coupler and amplifier, upon the loss of power to the amplifier."
The patent was filed on Sept. 14, 2007, under Application No. 11/900,988.
For further information please visit: http://patft.uspto.gov/netacgi/nph-Parser?
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