Cable television radio frequency subscriber data...

Details Cable television radio frequency subscriber data... Cable television radio frequency subscriber data...

H - Electricity

04

N

H04N 17/02 (2006.01) H04L 5/06 (2006.01) H04L 27/20 (2006.01) H04L 27/227 (2006.01) H04N 7/10 (2006.01) H04N 7/173 (2006.01) H04N 7/16 (2006.01)

Patent

CA 2078548

2078548 9115063 PCTABS00007 Automatic level calibration apparatus (100) for transmitting data from a cable television terminal (120) to the headend (110) of a cable television system (100) comprises programmable transmitter (200) apparatus of the terminal (120), programmable receiving apparatus (300) at the headend (110) and a calibration controller. Responsive to an addressed command from the headend (110), the programmable transmitter apparatus (200) returns a sequence of levels at a particular calibration frequency. The programmable receiver apparatus (300) determines an indication of the received signal strength of each of the levels of the sequence of levels. The controller determines an optimum level for transmissions from the terminal (120).

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