Communications: electrical – Systems – Selsyn type
Reexamination Certificate
2000-11-21
2001-12-18
Trieu, Van T. (Department: 2632)
Communications: electrical
Systems
Selsyn type
C340S315000, C340S315000
Reexamination Certificate
active
06331814
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates in general to the transmission of data over existing media in a building without adding any other cabling. In particular, the present invention relates to an adapter device for the transmission of digital data over an AC power line.
2. Description of the Related Art
The interconnection of hosts and peripherals such as printers or displays is generally made by means of cables and sometimes by electromagnetic waves such as infrared radiations when the peripheral is in sight with respect to the host. But, it sometimes is not possible to install cables in a building or such an installation is very difficult and very expensive because there are thick walls to come through. Anyway, adding cabling to an existing system in order to connect new peripherals is always unsightly. Furthermore, connection using electromagnetic waves, such as infrared, is not possible when the two devices to be interconnected are separated by obstacles such as walls.
SUMMARY OF THE INVENTION
According to a first aspect, the invention relates to an adapter device for utilizing an AC power line to carry data from a local data-handling unit (such as a computer) to a remote data handling unit (such as a printer or another computer) . The adapter device includes processing facilities that receive digital data from the local data-handling unit and transform the digital data into Intergrated Services Digital Network (ISDN) data. The adapter device also includes a burst transceiver circuit (BTC) that converts the ISDN data into low-voltage pseudo-ternary signals on a U interface. A transformer of the adapter device transforms the low-voltage pseudo-ternary signals into high-voltage pseudo-ternary signals and transmits the high-voltage pseudo-ternary signals via the AC power line.
According to a second aspect, the adapter device is utilized for receiving data from the local data-handling unit at the remote data-handling unit.
All objects, features, and advantages of the present invention will become apparent in the following detailed written description.
REFERENCES:
patent: 5396555 (1995-03-01), Shibata et al.
patent: 5559377 (1996-09-01), Abraham
patent: 5598455 (1997-01-01), Bliven et al.
patent: 5818127 (1998-10-01), Abraham
patent: 5949327 (1999-09-01), Brown
patent: 5994998 (1999-11-01), Fisher et al.
patent: 6140911 (2000-10-01), Fisher et al.
patent: 6157292 (2000-12-01), Piercy et al.
patent: 6185262 (2001-02-01), Brandstetter
Albano Andre
Benayoun Alain
Le Pennec Jean-Francois
Michel Patrick
Bracewell & Patterson
International Business Machines - Corporation
Trieu Van T.
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