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System for data channel level control

  • US 5,155,590 A
  • Filed: 03/20/1990
  • Issued: 10/13/1992
  • Est. Priority Date: 03/20/1990
  • Status: Expired due to Term
First Claim
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1. In a bi-directional cable television system comprising a system manager for controlling a plurality of television terminals over a cable television signal distribution system, apparatus for automatically calibrating a particular optimum transmit level for transmitting data from the television terminals to the system manager, the automatic level calibration apparatus comprising:

  • programmable transmitter apparatus located at said television terminals for transmitting a reply communication having a plurality of levels at a particular calibration frequency in response to an addressed command generated by the system manager,programmable receiver apparatus located at said system manager for receiving said reply communication at the particular calibration frequency and for determining an indication of received signal strength for each received level, anda controller coupled to said receiver for determining an optimum transmit level for operation of the programmable transmitter apparatus at the calibration frequency from said determined signal strengths.

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