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Apparatus for transmitting and/or receiving data at different data transfer rates especially in applications such as dual-rate ethernet local-area networks

  • US 5,541,957 A
  • Filed: 06/15/1994
  • Issued: 07/30/1996
  • Est. Priority Date: 06/15/1994
  • Status: Expired due to Term
First Claim
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1. Electronic apparatus comprising:

  • an isolation transformer having a primary winding and a secondary winding;

    a connecting unit electronically coupled to the secondary winding and connectable to a pair of lines of a twisted-pair cable so as to electronically couple the twisted-pair cable to the secondary winding;

    a first transmitter that low-pass filters digital data to produce outgoing data which the first transmitter differentially transmits to the primary winding largely at a first data transfer rate, the first transmitter containing a digital waveshaper that at least partially provides the low-pass filtering in the first transmitter; and

    a second transmitter that differentially transmits outgoing data to the primary winding largely at a second data transfer rate greater than the first data rate.

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