Power Line Communication Device and Method Of Using The Same

Abstract

The repeater of the present invention communicates data signals over power lines. The repeater of one embodiment includes at least one modem that receives a data packet and attempts to decrypt the data packet with a first and / or second encryption key. If the packet is successfully decrypted using the first encryption key, the packet is encrypted using the second encryption and transmitted over the power line. If the packet is successfully decrypted using the second encryption key, the packet is encrypted using the first encryption and transmitted over the power line.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation of, and claims priority to, U.S. patent application Ser. No. 10 / 434,024 filed May 8, 2003, which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION [0002] The present invention relates, generally, to power line communication devices and in particular, to a communication device for repeating data signals on power lines. BACKGROUND OF THE INVENTION [0003] Well-established power distribution systems exist throughout most of the United States, and other countries, that provide power to customers via power lines. With some modification, the infrastructure of the existing power distribution systems can be used to provide data communication in addition to power delivery, thereby forming a power line communication system (PLCS). In other words, existing power lines that already have been run to many homes and offices can be used to carry data signals to and from the homes and offices. T...

AI Technical Summary

Problems solved by technology

While the concept may sound simple, there are many challenges to overcome in order to use power lines for data communication.

Power system transformers are one obstacle to using MV or LV power distribution lines for data communication.

Transformers designed for conversion of voltages at power frequencies (i.e. 50 or 60 Hz) present complex and often undesirable series and shunt impedances that can be detrimental to data signal frequencies useful for data communication.

As such, power distribution communication systems face the challenge of passing the data signals around (or sometimes through) the distribution transformers.

In addition, power lines may provide a very noisy communication channel and such noise is often sporadic and unpredictable.

Thus, due to the limited power that may be used to transmit data signals on power lines (for example, due to Federal Communication Commission (FCC) regulations regarding RF emissions), high frequency data signals will only propagate a finite distance that in some instances may not be far enough from the transmitting source to be reliably received by the intended communication device.

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