Importance

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Abstract

A local computer network transceiver is provided for a distributed control local computer network which applies a signal to a medium which has a DC component wherein isolation is implemented at the medium interface without need for direct current coupling of any active circuit to the communication medium. The medium is typically a coaxial cable. Transmit isolation transformers are coupled across a coaxial coupler, the medium side thereof being coupled in series with a diode. A plurality of transmit isolation transformers may be coupled in parallel to the medium to permit operation at substantially higher frequencies than would otherwise be permitted due to self-resonant frequencies of the isolation transformers. A receive interface through a receive isolation transformer is provided with capacitive balancing to prevent common mode voltages from being converted into recognizable signals. Collision detection circuitry is provided through diodes coupled to the input side of the transmit isolation transformer circuits, which collision detection circuitry is active only during transmit periods.

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First Claim