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Modem suited for wireless communication channel use

  • US 4,852,122 A
  • Filed: 08/31/1987
  • Issued: 07/25/1989
  • Est. Priority Date: 08/31/1987
  • Status: Expired due to Term
First Claim
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1. A modem that communicates digital data with data terminal equipment (DTE), demodulates signals received from a two-way radio to recover encoded digital data, and provides a modulation signal to said radio for encoding digital data received from said DTE, said modem comprising:

  • means for generating and transmitting via said radio first and second digital command words representing data carrier detection (DCD) true prior to the transmission of digital data received from said DTE and DCD false at the end of transmission of said DTE digital data, respectively;

    means for providing a DCD true signal to said DTE on receiving said first digital signal and providing a DCD false signal to said DTE on receiving said second digital signal; and

    means for turning on the transmitter of said radio in response to a request to send (RTS) signal from said DTE and for turning off said transmitter after a predetermined delay following termination of said RTS signal.

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