Multiplex communications – Wide area network – Packet switching
Patent
1985-10-28
1987-10-06
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
375 7, H04B 900
Patent
active
046988009
ABSTRACT:
A simultaneous bi-directional transceiver is described. The transceiver comprises two circuits which are disposed at opposite ends of an interchip cable. In response to the application of digital data signals to these circuits, they generate a trilevel voltage at the ends of the interchip cable. Then, in each circuit, a first input to a differential amplifier is generated from the trilevel voltage by a level shifter comprising a first diode and a first constant current sink and a second input to the differential amplifier is derived from the digital data input signal applied to that circuit by a level shifter comprising a second diode and a second constant current source. Finally, the transceiver outputs are generated from the differential amplifier outputs.
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IBM Technical Disclosure Bulletin, A. Y. Chang, Simultaneous Bidirectional Transceiver Circuit, vol. 23, No. 4, Sep. 1980, pp. 1435-1437.
Cavaliere Joseph R.
Chang Albert Y.
Robortaccio Rocco J.
Beek Leslie Van
Griffin Robert L.
Haase Robert J.
International Business Machines - Corporation
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