3com Corporation

Telkonet, Inc.

Isdn Systems Corporation

James F Landry

Michael Joseph Giovannoni

Andrew Pozsgay

Joseph David Kralowetz

Thomas DeBruyne Stearns

Doug Adams

Donald Linder

Systems and methods for interfacing a power line communications (PLC)-enabled communication device in a building with a power network are disclosed. In various embodiments, a system can include a specially-configured coupler that enables a common PLC communications signal to be injected into the same power phase line of the power network, but at different service panels.

Power line coupler adapted for use with multiple service panels

Devices and system for interfacing a power line communications (PLC)-enabled communication device in a building using three-phase power and two separate electric power meters are disclosed. In various embodiments, the system can include a specially-configured coupler that enables PLC communications signals to pass to all power lines but without interfering with the operation of the electric power meters.

Power line coupler adapted for use with multiple electric power meters

Devices and system for interfacing multiple power line communications (PLC)-enabled communication devices in a building are disclosed. In various embodiments, the system can include a high-frequency transformer coupled to a high-frequency communications device, a low-frequency transformer coupled to a low-frequency communication device, and one or more components adapted to appreciably abate distortion and/or attenuation of high-frequency signals passing through the first coupling device.

Power line coupler adapted for use with multiple communication systems using different frequency spectra

A method and apparatus for selecting a supported signal path for a transceiver in a communication system is provided. An exemplary embodiment of the apparatus includes a relay for selecting a first test signal path from a first signal path and a second signal path. A signal detector coupled to the relay may be used to determine whether a specified signal type is present on the first test signal path. A relay controller causes the relay to select a second test signal path from the first signal path and the second signal path in response to the signal detector determining that the specified signal type is not present on the first test signal path.

Apparatus and method for selecting a supported signal path for a transceiver

A computer includes an adapter. The adapter includes an ISDN connection capable of communicating ISDN signals between the computer and a remote device. The adapter also includes an analog modem connection capable of communicating analog modem signals between the computer and the remote device. A selector device selects either the ISDN connection or the modem connection with which to transfer information between the computer and the remote device. The adapter card may transfer either analog modem information or ISDN modem information.

Adapter card that selects between an ISDN interface and an analog modem interface

Methods and apparatus for providing virtual local connection of one PC to another PC, a PC to a LAN and from one LAN to another LAN, over a synchronous digital wide area network (effectively enabling a LAN to be extended through a synchronous digital wide area network on a virtual basis), using a PC adapter card that includes an on board Data Service Unit (DSU)/Channel Service Unit (CSU), driven by control means that functions at least in part as a LAN interface emulator. The invention includes methods (and corresponding apparatus) for configuring the PC adapter card under program control; for establishing connectivity between at least one PC and at least one LAN, each separately connected to the network, via a gateway access thru the digital wide area network; and for utilizing the PC motherboard microprocessor to run user applications software while simultaneously being able to handle the real time constraints of running packet protocols (e.g., Frame Relay, X.25, SMDS, etc.), using a novel control means.

Methods and apparatus for interconnecting personal computers (PCs) and local area networks (LANs) using packet protocols transmitted over a digital data service (DDS)

Growing community of inventors

Germantown, MD, United States of America

James F Landry