Interface circuit having a data bus interface
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United States of America Patent
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Sep 12, 2017
Grant Date -
Dec 1, 2016
app pub date -
Dec 11, 2015
filing date -
Dec 12, 2014
priority date (Note) -
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Abstract
There is provided an interface circuit, a network switch or network device coupler incorporating the interface circuit, and a network incorporating the network switch or network device. The interface circuit has a data bus interface (7) for connecting a data bus to either a first device (6) that communicates in a first signalling protocol or a second device (6) that communicates in a second signalling protocol. The data bus has two bus conductors that provide combined power and data. A voltage source (12) powers the data bus. The voltage source (12) is connected to the data bus via a reactance (10) and then a first resistance (4) connected in series. An output of a transmitter (13) is connected via a second resistance (3) to a point between the reactance (10) and the first resistance, to modulate the data bus.
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