Passive data monitor for use with polling pattern generator in CATV system
First Claim
1. A passive data monitor for a CATV system having a single center and a number of terminal units connected to said center for transmitting television programs through cables to said terminal units, each of said terminal units having address setting means capable of arbitrarily setting address number therein, said passive data monitor comprising:
- means for receiving a polling pattern signal having an address code for calling a corresponding terminal unit and a command code for requesting a designated answer from the called terminal unit; and
means for comparing an up data signal outputted from said terminal unit in response to said code with said designated answer requested by said command code and for judging an operational state of said terminal unit from a resultant comparison output.
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Accused Products
Abstract
A polling pattern generator system for use in a CATV system including a polling pattern generator and a passive data monitor. The polling pattern generator periodically generates polling pattern signals each of which has a specific address code for calling a corresponding terminal unit and a command code for requesting a designated answer from the called terminal unit. The passive data monitor compares an up data signal outputted from the terminal unit in response to the command code with the designated answer requested by the command code and judges whether or not an operational state of the terminal unit is acceptable from the resultant comparison output. The passive data monitor sets the address code in the designated terminal unit.
122 Citations
4 Claims
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1. A passive data monitor for a CATV system having a single center and a number of terminal units connected to said center for transmitting television programs through cables to said terminal units, each of said terminal units having address setting means capable of arbitrarily setting address number therein, said passive data monitor comprising:
- means for receiving a polling pattern signal having an address code for calling a corresponding terminal unit and a command code for requesting a designated answer from the called terminal unit; and
means for comparing an up data signal outputted from said terminal unit in response to said code with said designated answer requested by said command code and for judging an operational state of said terminal unit from a resultant comparison output. - View Dependent Claims (2, 3, 4)
- means for receiving a polling pattern signal having an address code for calling a corresponding terminal unit and a command code for requesting a designated answer from the called terminal unit; and
Specification