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Apparatus for automatic sensing of line amplifier configuration for status monitoring
| Details |
Inventors: Brickell, John W.; Nash, Wayne H.;
Assignee: Scientific-Atlanta, Inc. (Lawrenceville, GA)
Primary Examiner: Miller; John
Assistant Examiner: Shang; Annan Q.
Attorney, Agent or Firm: Barnhardt, III; Hubert J., Massaroni; Kenneth M., Couturier; Shelley L.
An apparatus for indicating the configuration of a cable television line amplifier. The line amplifier contains a controller that senses a preset voltage on a status indication line. When the amplifier is reconfigured, such as by adding new circuits containing new functions or features, these new circuits contain resisters that are shunted to modify the preset voltage level on the appropriate status indication line. The controller senses the modified voltages and provides an indication of the new function of the new circuit to a headend through a cable television distribution system. |
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DETAILED DESCRIPTION What is claimed is: 1.
A line amplifier for receiving forward and reverse signals and for transmitting amplified forward and amplified reverse signals, the line amplifier having an output configuration that is one of a single output, a dual output, or a triple output for transmitting portions of the amplified forward signals, the line amplifier further including a monitoring circuit for detecting the output configuration and, the line amplifier comprising: an auto amplifier detect line having an output configuration voltage, wherein the output configuration voltage is indicative of one of the single output, the dual output, or the triple output; and a controller for determining the output configuration based on the output configuration voltage, wherein subsequent to determining the output configuration of the line amplifier, the controller sends a status signal indicating the output configuration along with the amplified reverse signals.
2.
The line amplifier of claim 1, further including an amplification circuit having an adjustable gain level for amplifying the forward signals, the line amplifier further comprising: an RF detector coupled to the output of the amplification circuit for receiving a portion of the forward amplified signals; and a removable AGC control circuit coupled to the RF detector for adjusting the amplification circuit that subsequently adjusts the gain level of the forward signals dependent upon any variations in comparison with the received portion of amplified forward signals, wherein the controller is coupled to the removable AGC control circuit and an AGC voltage source, and wherein the controller receives an AGC voltage that indicates one of the presence and the absence of the removable AGC control circuit, and wherein the controller sends an AGC control circuit status signal along with the amplified reverse signals.
3.
The line amplifier of claim 2, wherein when the removable AGC control circuit is present, the controller receives a thermal mode voltage that indicates whether the removable AGC control circuit is a thermal mode AGC control circuit
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Television 
